From 22e6601f345285e0b823771d5f8acde5d59709e7 Mon Sep 17 00:00:00 2001
From: Thomas Munro <thomas.munro@gmail.com>
Date: Thu, 18 Apr 2024 07:53:10 +1200
Subject: [PATCH v6] Use <stdint.h> and <inttypes.h> for integer types.

Use standard types and support for 64 bit integers, including int64_t,
INT64_MAX, INT64_C(), PRId64 etc.  Also use standard definitions of the
smaller integers.

One complication is that Windows' <inttypes.h> uses format strings like
%I64d, %I32, %I for PRI*64, PRI*32, PTR*PTR, rather than standard format
strings like %ld as seen on other systems.  We have to teach our own
snprintf.c to recognize them.

Work in progress...

Reviewed-by: Peter Eisentraut <peter@eisentraut.org>
Discussion: https://postgr.es/m/ME3P282MB3166F9D1F71F787929C0C7E7B6312%40ME3P282MB3166.AUSP282.PROD.OUTLOOK.COM
---
 config/c-compiler.m4                          |  78 +---
 configure                                     | 354 +++++-------------
 configure.ac                                  |  52 +--
 meson.build                                   |  44 +--
 src/Makefile.global.in                        |   6 -
 src/bin/pg_waldump/pg_waldump.c               |  16 +-
 src/bin/pgbench/pgbench.c                     |   4 +-
 src/include/.gitignore                        |   2 -
 src/include/Makefile                          |   8 +-
 src/include/c.h                               | 101 ++---
 src/include/meson.build                       |  10 -
 src/include/pg_config.h.in                    |  25 +-
 src/include/pg_config_ext.h.in                |   7 -
 src/include/pg_config_ext.h.meson             |   7 -
 src/include/port/pg_bitutils.h                |  16 +-
 src/include/postgres_ext.h                    |   4 +-
 src/include/utils/dsa.h                       |   2 +-
 src/interfaces/ecpg/ecpglib/typename.c        |   9 +-
 src/interfaces/ecpg/include/ecpg_config.h.in  |   8 +-
 src/interfaces/ecpg/include/meson.build       |   4 +-
 .../ecpg/include/pgtypes_interval.h           |  12 +-
 src/interfaces/ecpg/include/sqltypes.h        |   8 +-
 .../test/expected/compat_informix-sqlda.c     |   8 +-
 src/port/pg_bitutils.c                        |   6 +-
 src/port/snprintf.c                           |  64 +++-
 25 files changed, 274 insertions(+), 581 deletions(-)
 delete mode 100644 src/include/pg_config_ext.h.in
 delete mode 100644 src/include/pg_config_ext.h.meson

diff --git a/config/c-compiler.m4 b/config/c-compiler.m4
index 309d5b04b46..e112fd45d48 100644
--- a/config/c-compiler.m4
+++ b/config/c-compiler.m4
@@ -38,60 +38,6 @@ ac_c_werror_flag=$ac_save_c_werror_flag
 ])# PGAC_TEST_PRINTF_ARCHETYPE
 
 
-# PGAC_TYPE_64BIT_INT(TYPE)
-# -------------------------
-# Check if TYPE is a working 64 bit integer type. Set HAVE_TYPE_64 to
-# yes or no respectively, and define HAVE_TYPE_64 if yes.
-AC_DEFUN([PGAC_TYPE_64BIT_INT],
-[define([Ac_define], [translit([have_$1_64], [a-z *], [A-Z_P])])dnl
-define([Ac_cachevar], [translit([pgac_cv_type_$1_64], [ *], [_p])])dnl
-AC_CACHE_CHECK([whether $1 is 64 bits], [Ac_cachevar],
-[AC_RUN_IFELSE([AC_LANG_SOURCE(
-[typedef $1 ac_int64;
-
-/*
- * These are globals to discourage the compiler from folding all the
- * arithmetic tests down to compile-time constants.
- */
-ac_int64 a = 20000001;
-ac_int64 b = 40000005;
-
-int does_int64_work()
-{
-  ac_int64 c,d;
-
-  if (sizeof(ac_int64) != 8)
-    return 0;			/* definitely not the right size */
-
-  /* Do perfunctory checks to see if 64-bit arithmetic seems to work */
-  c = a * b;
-  d = (c + b) / b;
-  if (d != a+1)
-    return 0;
-  return 1;
-}
-
-int
-main() {
-  return (! does_int64_work());
-}])],
-[Ac_cachevar=yes],
-[Ac_cachevar=no],
-[# If cross-compiling, check the size reported by the compiler and
-# trust that the arithmetic works.
-AC_COMPILE_IFELSE([AC_LANG_BOOL_COMPILE_TRY([], [sizeof($1) == 8])],
-                  Ac_cachevar=yes,
-                  Ac_cachevar=no)])])
-
-Ac_define=$Ac_cachevar
-if test x"$Ac_cachevar" = xyes ; then
-  AC_DEFINE(Ac_define, 1, [Define to 1 if `]$1[' works and is 64 bits.])
-fi
-undefine([Ac_define])dnl
-undefine([Ac_cachevar])dnl
-])# PGAC_TYPE_64BIT_INT
-
-
 # PGAC_TYPE_128BIT_INT
 # --------------------
 # Check if __int128 is a working 128 bit integer type, and if so
@@ -270,9 +216,10 @@ fi])# PGAC_C_BUILTIN_CONSTANT_P
 AC_DEFUN([PGAC_C_BUILTIN_OP_OVERFLOW],
 [AC_CACHE_CHECK(for __builtin_mul_overflow, pgac_cv__builtin_op_overflow,
 [AC_LINK_IFELSE([AC_LANG_PROGRAM([
-PG_INT64_TYPE a = 1;
-PG_INT64_TYPE b = 1;
-PG_INT64_TYPE result;
+#include <stdint.h>
+int64_t a = 1;
+int64_t b = 1;
+int64_t result;
 int oflo;
 ],
 [oflo = __builtin_mul_overflow(a, b, &result);])],
@@ -557,13 +504,13 @@ fi])# PGAC_HAVE_GCC__SYNC_INT32_CAS
 # types, and define HAVE_GCC__SYNC_INT64_CAS if so.
 AC_DEFUN([PGAC_HAVE_GCC__SYNC_INT64_CAS],
 [AC_CACHE_CHECK(for builtin __sync int64 atomic operations, pgac_cv_gcc_sync_int64_cas,
-[AC_LINK_IFELSE([AC_LANG_PROGRAM([],
-  [PG_INT64_TYPE lock = 0;
-   __sync_val_compare_and_swap(&lock, 0, (PG_INT64_TYPE) 37);])],
+[AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <stdint.h>],
+  [int64_t lock = 0;
+   __sync_val_compare_and_swap(&lock, 0, (int64_t) 37);])],
   [pgac_cv_gcc_sync_int64_cas="yes"],
   [pgac_cv_gcc_sync_int64_cas="no"])])
 if test x"$pgac_cv_gcc_sync_int64_cas" = x"yes"; then
-  AC_DEFINE(HAVE_GCC__SYNC_INT64_CAS, 1, [Define to 1 if you have __sync_val_compare_and_swap(int64 *, int64, int64).])
+  AC_DEFINE(HAVE_GCC__SYNC_INT64_CAS, 1, [Define to 1 if you have __sync_val_compare_and_swap(int64_t *, int64_t, int64_t).])
 fi])# PGAC_HAVE_GCC__SYNC_INT64_CAS
 
 # PGAC_HAVE_GCC__ATOMIC_INT32_CAS
@@ -588,9 +535,9 @@ fi])# PGAC_HAVE_GCC__ATOMIC_INT32_CAS
 # types, and define HAVE_GCC__ATOMIC_INT64_CAS if so.
 AC_DEFUN([PGAC_HAVE_GCC__ATOMIC_INT64_CAS],
 [AC_CACHE_CHECK(for builtin __atomic int64 atomic operations, pgac_cv_gcc_atomic_int64_cas,
-[AC_LINK_IFELSE([AC_LANG_PROGRAM([],
-  [PG_INT64_TYPE val = 0;
-   PG_INT64_TYPE expect = 0;
+[AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <stdint.h>],
+  [int64_t val = 0;
+   int64_t expect = 0;
    __atomic_compare_exchange_n(&val, &expect, 37, 0, __ATOMIC_SEQ_CST, __ATOMIC_RELAXED);])],
   [pgac_cv_gcc_atomic_int64_cas="yes"],
   [pgac_cv_gcc_atomic_int64_cas="no"])])
@@ -734,13 +681,14 @@ AC_DEFUN([PGAC_AVX512_POPCNT_INTRINSICS],
 [define([Ac_cachevar], [AS_TR_SH([pgac_cv_avx512_popcnt_intrinsics])])dnl
 AC_CACHE_CHECK([for _mm512_popcnt_epi64], [Ac_cachevar],
 [AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <immintrin.h>
+    #include <stdint.h>
     #if defined(__has_attribute) && __has_attribute (target)
     __attribute__((target("avx512vpopcntdq,avx512bw")))
     #endif
     static int popcount_test(void)
     {
       const char buf@<:@sizeof(__m512i)@:>@;
-      PG_INT64_TYPE popcnt = 0;
+      int64_t popcnt = 0;
       __m512i accum = _mm512_setzero_si512();
       const __m512i val = _mm512_maskz_loadu_epi8((__mmask64) 0xf0f0f0f0f0f0f0f0, (const __m512i *) buf);
       const __m512i cnt = _mm512_popcnt_epi64(val);
diff --git a/configure b/configure
index ff59f1422d8..bc49cebc990 100755
--- a/configure
+++ b/configure
@@ -14436,6 +14436,43 @@ if test x"$pgac_cv__builtin_constant_p" = xyes ; then
 
 $as_echo "#define HAVE__BUILTIN_CONSTANT_P 1" >>confdefs.h
 
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __builtin_mul_overflow" >&5
+$as_echo_n "checking for __builtin_mul_overflow... " >&6; }
+if ${pgac_cv__builtin_op_overflow+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+#include <stdint.h>
+int64_t a = 1;
+int64_t b = 1;
+int64_t result;
+int oflo;
+
+int
+main ()
+{
+oflo = __builtin_mul_overflow(a, b, &result);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  pgac_cv__builtin_op_overflow=yes
+else
+  pgac_cv__builtin_op_overflow=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv__builtin_op_overflow" >&5
+$as_echo "$pgac_cv__builtin_op_overflow" >&6; }
+if test x"$pgac_cv__builtin_op_overflow" = xyes ; then
+
+$as_echo "#define HAVE__BUILTIN_OP_OVERFLOW 1" >>confdefs.h
+
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for __builtin_unreachable" >&5
 $as_echo_n "checking for __builtin_unreachable... " >&6; }
@@ -16196,236 +16233,6 @@ fi
 # Run tests below here
 # --------------------
 
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether long int is 64 bits" >&5
-$as_echo_n "checking whether long int is 64 bits... " >&6; }
-if ${pgac_cv_type_long_int_64+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-  if test "$cross_compiling" = yes; then :
-  # If cross-compiling, check the size reported by the compiler and
-# trust that the arithmetic works.
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-int
-main ()
-{
-static int test_array [1 - 2 * !(sizeof(long int) == 8)];
-test_array [0] = 0;
-return test_array [0];
-
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_c_try_compile "$LINENO"; then :
-  pgac_cv_type_long_int_64=yes
-else
-  pgac_cv_type_long_int_64=no
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-else
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-typedef long int ac_int64;
-
-/*
- * These are globals to discourage the compiler from folding all the
- * arithmetic tests down to compile-time constants.
- */
-ac_int64 a = 20000001;
-ac_int64 b = 40000005;
-
-int does_int64_work()
-{
-  ac_int64 c,d;
-
-  if (sizeof(ac_int64) != 8)
-    return 0;			/* definitely not the right size */
-
-  /* Do perfunctory checks to see if 64-bit arithmetic seems to work */
-  c = a * b;
-  d = (c + b) / b;
-  if (d != a+1)
-    return 0;
-  return 1;
-}
-
-int
-main() {
-  return (! does_int64_work());
-}
-_ACEOF
-if ac_fn_c_try_run "$LINENO"; then :
-  pgac_cv_type_long_int_64=yes
-else
-  pgac_cv_type_long_int_64=no
-fi
-rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
-  conftest.$ac_objext conftest.beam conftest.$ac_ext
-fi
-
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv_type_long_int_64" >&5
-$as_echo "$pgac_cv_type_long_int_64" >&6; }
-
-HAVE_LONG_INT_64=$pgac_cv_type_long_int_64
-if test x"$pgac_cv_type_long_int_64" = xyes ; then
-
-$as_echo "#define HAVE_LONG_INT_64 1" >>confdefs.h
-
-fi
-
-
-if test x"$HAVE_LONG_INT_64" = x"yes" ; then
-  pg_int64_type="long int"
-else
-  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether long long int is 64 bits" >&5
-$as_echo_n "checking whether long long int is 64 bits... " >&6; }
-if ${pgac_cv_type_long_long_int_64+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-  if test "$cross_compiling" = yes; then :
-  # If cross-compiling, check the size reported by the compiler and
-# trust that the arithmetic works.
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-int
-main ()
-{
-static int test_array [1 - 2 * !(sizeof(long long int) == 8)];
-test_array [0] = 0;
-return test_array [0];
-
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_c_try_compile "$LINENO"; then :
-  pgac_cv_type_long_long_int_64=yes
-else
-  pgac_cv_type_long_long_int_64=no
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-else
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-typedef long long int ac_int64;
-
-/*
- * These are globals to discourage the compiler from folding all the
- * arithmetic tests down to compile-time constants.
- */
-ac_int64 a = 20000001;
-ac_int64 b = 40000005;
-
-int does_int64_work()
-{
-  ac_int64 c,d;
-
-  if (sizeof(ac_int64) != 8)
-    return 0;			/* definitely not the right size */
-
-  /* Do perfunctory checks to see if 64-bit arithmetic seems to work */
-  c = a * b;
-  d = (c + b) / b;
-  if (d != a+1)
-    return 0;
-  return 1;
-}
-
-int
-main() {
-  return (! does_int64_work());
-}
-_ACEOF
-if ac_fn_c_try_run "$LINENO"; then :
-  pgac_cv_type_long_long_int_64=yes
-else
-  pgac_cv_type_long_long_int_64=no
-fi
-rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
-  conftest.$ac_objext conftest.beam conftest.$ac_ext
-fi
-
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv_type_long_long_int_64" >&5
-$as_echo "$pgac_cv_type_long_long_int_64" >&6; }
-
-HAVE_LONG_LONG_INT_64=$pgac_cv_type_long_long_int_64
-if test x"$pgac_cv_type_long_long_int_64" = xyes ; then
-
-$as_echo "#define HAVE_LONG_LONG_INT_64 1" >>confdefs.h
-
-fi
-
-  if test x"$HAVE_LONG_LONG_INT_64" = x"yes" ; then
-    pg_int64_type="long long int"
-  else
-    as_fn_error $? "Cannot find a working 64-bit integer type." "$LINENO" 5
-  fi
-fi
-
-
-cat >>confdefs.h <<_ACEOF
-#define PG_INT64_TYPE $pg_int64_type
-_ACEOF
-
-
-# Select the printf length modifier that goes with that, too.
-if test x"$pg_int64_type" = x"long long int" ; then
-  INT64_MODIFIER='"ll"'
-else
-  INT64_MODIFIER='"l"'
-fi
-
-
-cat >>confdefs.h <<_ACEOF
-#define INT64_MODIFIER $INT64_MODIFIER
-_ACEOF
-
-
-# has to be down here, rather than with the other builtins, because
-# the test uses PG_INT64_TYPE.
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __builtin_mul_overflow" >&5
-$as_echo_n "checking for __builtin_mul_overflow... " >&6; }
-if ${pgac_cv__builtin_op_overflow+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-PG_INT64_TYPE a = 1;
-PG_INT64_TYPE b = 1;
-PG_INT64_TYPE result;
-int oflo;
-
-int
-main ()
-{
-oflo = __builtin_mul_overflow(a, b, &result);
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
-  pgac_cv__builtin_op_overflow=yes
-else
-  pgac_cv__builtin_op_overflow=no
-fi
-rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext conftest.$ac_ext
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv__builtin_op_overflow" >&5
-$as_echo "$pgac_cv__builtin_op_overflow" >&6; }
-if test x"$pgac_cv__builtin_op_overflow" = xyes ; then
-
-$as_echo "#define HAVE__BUILTIN_OP_OVERFLOW 1" >>confdefs.h
-
-fi
-
 # Check size of void *, size_t (enables tweaks for > 32bit address space)
 # The cast to long int works around a bug in the HP C Compiler
 # version HP92453-01 B.11.11.23709.GP, which incorrectly rejects
@@ -16526,6 +16333,39 @@ cat >>confdefs.h <<_ACEOF
 _ACEOF
 
 
+# The cast to long int works around a bug in the HP C Compiler
+# version HP92453-01 B.11.11.23709.GP, which incorrectly rejects
+# declarations like `int a3[[(sizeof (unsigned char)) >= 0]];'.
+# This bug is HP SR number 8606223364.
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking size of long long" >&5
+$as_echo_n "checking size of long long... " >&6; }
+if ${ac_cv_sizeof_long_long+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if ac_fn_c_compute_int "$LINENO" "(long int) (sizeof (long long))" "ac_cv_sizeof_long_long"        "$ac_includes_default"; then :
+
+else
+  if test "$ac_cv_type_long_long" = yes; then
+     { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error 77 "cannot compute sizeof (long long)
+See \`config.log' for more details" "$LINENO" 5; }
+   else
+     ac_cv_sizeof_long_long=0
+   fi
+fi
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_sizeof_long_long" >&5
+$as_echo "$ac_cv_sizeof_long_long" >&6; }
+
+
+
+cat >>confdefs.h <<_ACEOF
+#define SIZEOF_LONG_LONG $ac_cv_sizeof_long_long
+_ACEOF
+
+
 
 # Determine memory alignment requirements for the basic C data types.
 
@@ -16634,43 +16474,41 @@ cat >>confdefs.h <<_ACEOF
 _ACEOF
 
 
-if test x"$HAVE_LONG_LONG_INT_64" = x"yes" ; then
-  # The cast to long int works around a bug in the HP C Compiler,
+# The cast to long int works around a bug in the HP C Compiler,
 # see AC_CHECK_SIZEOF for more information.
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking alignment of long long int" >&5
-$as_echo_n "checking alignment of long long int... " >&6; }
-if ${ac_cv_alignof_long_long_int+:} false; then :
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking alignment of int64_t" >&5
+$as_echo_n "checking alignment of int64_t... " >&6; }
+if ${ac_cv_alignof_int64_t+:} false; then :
   $as_echo_n "(cached) " >&6
 else
-  if ac_fn_c_compute_int "$LINENO" "(long int) offsetof (ac__type_alignof_, y)" "ac_cv_alignof_long_long_int"        "$ac_includes_default
+  if ac_fn_c_compute_int "$LINENO" "(long int) offsetof (ac__type_alignof_, y)" "ac_cv_alignof_int64_t"        "$ac_includes_default
 #ifndef offsetof
 # define offsetof(type, member) ((char *) &((type *) 0)->member - (char *) 0)
 #endif
-typedef struct { char x; long long int y; } ac__type_alignof_;"; then :
+typedef struct { char x; int64_t y; } ac__type_alignof_;"; then :
 
 else
-  if test "$ac_cv_type_long_long_int" = yes; then
+  if test "$ac_cv_type_int64_t" = yes; then
      { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
 $as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
-as_fn_error 77 "cannot compute alignment of long long int
+as_fn_error 77 "cannot compute alignment of int64_t
 See \`config.log' for more details" "$LINENO" 5; }
    else
-     ac_cv_alignof_long_long_int=0
+     ac_cv_alignof_int64_t=0
    fi
 fi
 
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_alignof_long_long_int" >&5
-$as_echo "$ac_cv_alignof_long_long_int" >&6; }
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_alignof_int64_t" >&5
+$as_echo "$ac_cv_alignof_int64_t" >&6; }
 
 
 
 cat >>confdefs.h <<_ACEOF
-#define ALIGNOF_LONG_LONG_INT $ac_cv_alignof_long_long_int
+#define ALIGNOF_INT64_T $ac_cv_alignof_int64_t
 _ACEOF
 
 
-fi
 # The cast to long int works around a bug in the HP C Compiler,
 # see AC_CHECK_SIZEOF for more information.
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking alignment of double" >&5
@@ -16728,8 +16566,8 @@ MAX_ALIGNOF=$ac_cv_alignof_double
 if test $ac_cv_alignof_long -gt $MAX_ALIGNOF ; then
   as_fn_error $? "alignment of 'long' is greater than the alignment of 'double'" "$LINENO" 5
 fi
-if test x"$HAVE_LONG_LONG_INT_64" = xyes && test $ac_cv_alignof_long_long_int -gt $MAX_ALIGNOF ; then
-  as_fn_error $? "alignment of 'long long int' is greater than the alignment of 'double'" "$LINENO" 5
+if test $ac_cv_alignof_int64_t -gt $MAX_ALIGNOF ; then
+  as_fn_error $? "alignment of 'int64_t' is greater than the alignment of 'double'" "$LINENO" 5
 fi
 
 cat >>confdefs.h <<_ACEOF
@@ -16737,7 +16575,6 @@ cat >>confdefs.h <<_ACEOF
 _ACEOF
 
 
-
 # Some compilers offer a 128-bit integer scalar type.
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for __int128" >&5
 $as_echo_n "checking for __int128... " >&6; }
@@ -16992,12 +16829,12 @@ if ${pgac_cv_gcc_sync_int64_cas+:} false; then :
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-
+#include <stdint.h>
 int
 main ()
 {
-PG_INT64_TYPE lock = 0;
-   __sync_val_compare_and_swap(&lock, 0, (PG_INT64_TYPE) 37);
+int64_t lock = 0;
+   __sync_val_compare_and_swap(&lock, 0, (int64_t) 37);
   ;
   return 0;
 }
@@ -17057,12 +16894,12 @@ if ${pgac_cv_gcc_atomic_int64_cas+:} false; then :
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-
+#include <stdint.h>
 int
 main ()
 {
-PG_INT64_TYPE val = 0;
-   PG_INT64_TYPE expect = 0;
+int64_t val = 0;
+   int64_t expect = 0;
    __atomic_compare_exchange_n(&val, &expect, 37, 0, __ATOMIC_SEQ_CST, __ATOMIC_RELAXED);
   ;
   return 0;
@@ -17278,13 +17115,14 @@ else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #include <immintrin.h>
+    #include <stdint.h>
     #if defined(__has_attribute) && __has_attribute (target)
     __attribute__((target("avx512vpopcntdq,avx512bw")))
     #endif
     static int popcount_test(void)
     {
       const char buf[sizeof(__m512i)];
-      PG_INT64_TYPE popcnt = 0;
+      int64_t popcnt = 0;
       __m512i accum = _mm512_setzero_si512();
       const __m512i val = _mm512_maskz_loadu_epi8((__mmask64) 0xf0f0f0f0f0f0f0f0, (const __m512i *) buf);
       const __m512i cnt = _mm512_popcnt_epi64(val);
@@ -18954,9 +18792,6 @@ fi
 ac_config_headers="$ac_config_headers src/include/pg_config.h"
 
 
-ac_config_headers="$ac_config_headers src/include/pg_config_ext.h"
-
-
 ac_config_headers="$ac_config_headers src/interfaces/ecpg/include/ecpg_config.h"
 
 
@@ -19671,7 +19506,6 @@ do
     "src/Makefile.port") CONFIG_LINKS="$CONFIG_LINKS src/Makefile.port:src/makefiles/Makefile.${template}" ;;
     "check_win32_symlinks") CONFIG_COMMANDS="$CONFIG_COMMANDS check_win32_symlinks" ;;
     "src/include/pg_config.h") CONFIG_HEADERS="$CONFIG_HEADERS src/include/pg_config.h" ;;
-    "src/include/pg_config_ext.h") CONFIG_HEADERS="$CONFIG_HEADERS src/include/pg_config_ext.h" ;;
     "src/interfaces/ecpg/include/ecpg_config.h") CONFIG_HEADERS="$CONFIG_HEADERS src/interfaces/ecpg/include/ecpg_config.h" ;;
 
   *) as_fn_error $? "invalid argument: \`$ac_config_target'" "$LINENO" 5;;
@@ -20279,10 +20113,6 @@ $as_echo "$as_me: WARNING: *** link for $FILE -- please fix by hand" >&2;}
     "src/include/pg_config.h":H)
 # Update timestamp for pg_config.h (see Makefile.global)
 echo >src/include/stamp-h
- ;;
-    "src/include/pg_config_ext.h":H)
-# Update timestamp for pg_config_ext.h (see Makefile.global)
-echo >src/include/stamp-ext-h
  ;;
     "src/interfaces/ecpg/include/ecpg_config.h":H) echo >src/interfaces/ecpg/include/stamp-h ;;
 
diff --git a/configure.ac b/configure.ac
index 21817009642..074ecc62d20 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1604,6 +1604,7 @@ PGAC_C_STATIC_ASSERT
 PGAC_C_TYPEOF
 PGAC_C_TYPES_COMPATIBLE
 PGAC_C_BUILTIN_CONSTANT_P
+PGAC_C_BUILTIN_OP_OVERFLOW
 PGAC_C_BUILTIN_UNREACHABLE
 PGAC_C_COMPUTED_GOTO
 PGAC_STRUCT_TIMEZONE
@@ -1906,54 +1907,18 @@ for the exact reason.]])],
 # Run tests below here
 # --------------------
 
-dnl Check to see if we have a working 64-bit integer type.
-dnl Since Postgres 8.4, we no longer support compilers without a working
-dnl 64-bit type; but we have to determine whether that type is called
-dnl "long int" or "long long int".
-
-PGAC_TYPE_64BIT_INT([long int])
-
-if test x"$HAVE_LONG_INT_64" = x"yes" ; then
-  pg_int64_type="long int"
-else
-  PGAC_TYPE_64BIT_INT([long long int])
-  if test x"$HAVE_LONG_LONG_INT_64" = x"yes" ; then
-    pg_int64_type="long long int"
-  else
-    AC_MSG_ERROR([Cannot find a working 64-bit integer type.])
-  fi
-fi
-
-AC_DEFINE_UNQUOTED(PG_INT64_TYPE, $pg_int64_type,
-  [Define to the name of a signed 64-bit integer type.])
-
-# Select the printf length modifier that goes with that, too.
-if test x"$pg_int64_type" = x"long long int" ; then
-  INT64_MODIFIER='"ll"'
-else
-  INT64_MODIFIER='"l"'
-fi
-
-AC_DEFINE_UNQUOTED(INT64_MODIFIER, $INT64_MODIFIER,
-                   [Define to the appropriate printf length modifier for 64-bit ints.])
-
-# has to be down here, rather than with the other builtins, because
-# the test uses PG_INT64_TYPE.
-PGAC_C_BUILTIN_OP_OVERFLOW
-
 # Check size of void *, size_t (enables tweaks for > 32bit address space)
 AC_CHECK_SIZEOF([void *])
 AC_CHECK_SIZEOF([size_t])
 AC_CHECK_SIZEOF([long])
+AC_CHECK_SIZEOF([long long])
 
 # Determine memory alignment requirements for the basic C data types.
 
 AC_CHECK_ALIGNOF(short)
 AC_CHECK_ALIGNOF(int)
 AC_CHECK_ALIGNOF(long)
-if test x"$HAVE_LONG_LONG_INT_64" = x"yes" ; then
-  AC_CHECK_ALIGNOF(long long int)
-fi
+AC_CHECK_ALIGNOF(int64_t)
 AC_CHECK_ALIGNOF(double)
 
 # Compute maximum alignment of any basic type.
@@ -1977,12 +1942,11 @@ MAX_ALIGNOF=$ac_cv_alignof_double
 if test $ac_cv_alignof_long -gt $MAX_ALIGNOF ; then
   AC_MSG_ERROR([alignment of 'long' is greater than the alignment of 'double'])
 fi
-if test x"$HAVE_LONG_LONG_INT_64" = xyes && test $ac_cv_alignof_long_long_int -gt $MAX_ALIGNOF ; then
-  AC_MSG_ERROR([alignment of 'long long int' is greater than the alignment of 'double'])
+if test $ac_cv_alignof_int64_t -gt $MAX_ALIGNOF ; then
+  AC_MSG_ERROR([alignment of 'int64_t' is greater than the alignment of 'double'])
 fi
 AC_DEFINE_UNQUOTED(MAXIMUM_ALIGNOF, $MAX_ALIGNOF, [Define as the maximum alignment requirement of any C data type.])
 
-
 # Some compilers offer a 128-bit integer scalar type.
 PGAC_TYPE_128BIT_INT
 
@@ -2472,12 +2436,6 @@ AC_CONFIG_HEADERS([src/include/pg_config.h],
 echo >src/include/stamp-h
 ])
 
-AC_CONFIG_HEADERS([src/include/pg_config_ext.h],
-[
-# Update timestamp for pg_config_ext.h (see Makefile.global)
-echo >src/include/stamp-ext-h
-])
-
 AC_CONFIG_HEADERS([src/interfaces/ecpg/include/ecpg_config.h],
                   [echo >src/interfaces/ecpg/include/stamp-h])
 
diff --git a/meson.build b/meson.build
index 451c3f6d851..a2e35bca077 100644
--- a/meson.build
+++ b/meson.build
@@ -1588,21 +1588,6 @@ if not cc.compiles(c99_test, name: 'c99', args: test_c_args)
   endif
 endif
 
-sizeof_long = cc.sizeof('long', args: test_c_args)
-cdata.set('SIZEOF_LONG', sizeof_long)
-if sizeof_long == 8
-  cdata.set('HAVE_LONG_INT_64', 1)
-  pg_int64_type = 'long int'
-  cdata.set_quoted('INT64_MODIFIER', 'l')
-elif sizeof_long == 4 and cc.sizeof('long long', args: test_c_args) == 8
-  cdata.set('HAVE_LONG_LONG_INT_64', 1)
-  pg_int64_type = 'long long int'
-  cdata.set_quoted('INT64_MODIFIER', 'll')
-else
-  error('do not know how to get a 64bit int')
-endif
-cdata.set('PG_INT64_TYPE', pg_int64_type)
-
 if host_machine.endian() == 'big'
   cdata.set('WORDS_BIGENDIAN', 1)
 endif
@@ -1626,16 +1611,21 @@ endforeach
 # of MAXIMUM_ALIGNOF to avoid that, but we no longer support any platforms
 # where TYPALIGN_DOUBLE != MAXIMUM_ALIGNOF.
 #
-# We assume without checking that int64's alignment is at least as strong
+# We assume without checking that int64_t's alignment is at least as strong
 # as long, char, short, or int.  Note that we intentionally do not consider
 # any types wider than 64 bits, as allowing MAXIMUM_ALIGNOF to exceed 8
 # would be too much of a penalty for disk and memory space.
 alignof_double = cdata.get('ALIGNOF_DOUBLE')
-if cc.alignment(pg_int64_type, args: test_c_args) > alignof_double
-  error('alignment of int64 is greater than the alignment of double')
+if cc.alignment('int64_t', args: test_c_args, prefix: '#include <stdint.h>') > alignof_double
+  error('alignment of int64_t is greater than the alignment of double')
 endif
 cdata.set('MAXIMUM_ALIGNOF', alignof_double)
 
+cdata.set('SIZEOF_LONG', cc.sizeof('long', args: test_c_args))
+cdata.set('SIZEOF_LONG_LONG', cc.sizeof('long long', args: test_c_args))
+
+# Check if __int128 is a working 128 bit integer type, and if so
+# define PG_INT128_TYPE to that typename.
 cdata.set('SIZEOF_VOID_P', cc.sizeof('void *', args: test_c_args))
 cdata.set('SIZEOF_SIZE_T', cc.sizeof('size_t', args: test_c_args))
 
@@ -1834,17 +1824,17 @@ endif
 # compile, and store the results in global variables so the compiler doesn't
 # optimize away the call.
 if cc.links('''
-    INT64 a = 1;
-    INT64 b = 1;
-    INT64 result;
+    #include <stdint.h>
+    int64_t a = 1;
+    int64_t b = 1;
+    int64_t result;
 
     int main(void)
     {
         return __builtin_mul_overflow(a, b, &result);
     }''',
     name: '__builtin_mul_overflow',
-    args: test_c_args + ['-DINT64=@0@'.format(cdata.get('PG_INT64_TYPE'))],
-    )
+    args: test_c_args)
   cdata.set('HAVE__BUILTIN_OP_OVERFLOW', 1)
 endif
 
@@ -2134,7 +2124,7 @@ int main(void)
   cdata.set(check['name'],
     cc.links(test,
       name: check['desc'],
-      args: test_c_args + ['-DINT64=@0@'.format(cdata.get('PG_INT64_TYPE'))]) ? 1 : false
+      args: test_c_args) ? 1 : false
   )
 endforeach
 
@@ -2172,6 +2162,7 @@ if host_cpu == 'x86_64'
 
   prog = '''
 #include <immintrin.h>
+#include <stdint.h>
 
 #if defined(__has_attribute) && __has_attribute (target)
 __attribute__((target("avx512vpopcntdq,avx512bw")))
@@ -2179,7 +2170,7 @@ __attribute__((target("avx512vpopcntdq,avx512bw")))
 int main(void)
 {
     const char buf[sizeof(__m512i)];
-    INT64 popcnt = 0;
+    int64_t popcnt = 0;
     __m512i accum = _mm512_setzero_si512();
     const __m512i val = _mm512_maskz_loadu_epi8((__mmask64) 0xf0f0f0f0f0f0f0f0, (const __m512i *) buf);
     const __m512i cnt = _mm512_popcnt_epi64(val);
@@ -2190,8 +2181,7 @@ int main(void)
 }
 '''
 
-  if cc.links(prog, name: 'AVX-512 popcount',
-        args: test_c_args + ['-DINT64=@0@'.format(cdata.get('PG_INT64_TYPE'))])
+  if cc.links(prog, name: 'AVX-512 popcount', args: test_c_args)
     cdata.set('USE_AVX512_POPCNT_WITH_RUNTIME_CHECK', 1)
   endif
 
diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index 0f38d712d15..eac3d001211 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -840,12 +840,6 @@ $(top_builddir)/src/include/pg_config.h: $(top_builddir)/src/include/stamp-h ;
 $(top_builddir)/src/include/stamp-h: $(top_srcdir)/src/include/pg_config.h.in $(top_builddir)/config.status
 	cd $(top_builddir) && ./config.status src/include/pg_config.h
 
-# Also remake pg_config_ext.h from pg_config_ext.h.in, same logic as above.
-$(top_builddir)/src/include/pg_config_ext.h: $(top_builddir)/src/include/stamp-ext-h ;
-
-$(top_builddir)/src/include/stamp-ext-h: $(top_srcdir)/src/include/pg_config_ext.h.in $(top_builddir)/config.status
-	cd $(top_builddir) && ./config.status src/include/pg_config_ext.h
-
 # Also remake ecpg_config.h from ecpg_config.h.in if the latter changed, same
 # logic as above.
 $(top_builddir)/src/interfaces/ecpg/include/ecpg_config.h: $(top_builddir)/src/interfaces/ecpg/include/stamp-h ;
diff --git a/src/bin/pg_waldump/pg_waldump.c b/src/bin/pg_waldump/pg_waldump.c
index 1f9403fc5cf..c4b04d62965 100644
--- a/src/bin/pg_waldump/pg_waldump.c
+++ b/src/bin/pg_waldump/pg_waldump.c
@@ -610,10 +610,10 @@ XLogDumpStatsRow(const char *name,
 		tot_len_pct = 100 * (double) tot_len / total_len;
 
 	printf("%-27s "
-		   "%20" INT64_MODIFIER "u (%6.02f) "
-		   "%20" INT64_MODIFIER "u (%6.02f) "
-		   "%20" INT64_MODIFIER "u (%6.02f) "
-		   "%20" INT64_MODIFIER "u (%6.02f)\n",
+		   "%20" PRIu64 " (%6.02f) "
+		   "%20" PRIu64 " (%6.02f) "
+		   "%20" PRIu64 " (%6.02f) "
+		   "%20" PRIu64 " (%6.02f)\n",
 		   name, n, n_pct, rec_len, rec_len_pct, fpi_len, fpi_len_pct,
 		   tot_len, tot_len_pct);
 }
@@ -742,10 +742,10 @@ XLogDumpDisplayStats(XLogDumpConfig *config, XLogStats *stats)
 		fpi_len_pct = 100 * (double) total_fpi_len / total_len;
 
 	printf("%-27s "
-		   "%20" INT64_MODIFIER "u %-9s"
-		   "%20" INT64_MODIFIER "u %-9s"
-		   "%20" INT64_MODIFIER "u %-9s"
-		   "%20" INT64_MODIFIER "u %-6s\n",
+		   "%20" PRIu64 " %-9s"
+		   "%20" PRIu64 " %-9s"
+		   "%20" PRIu64 " %-9s"
+		   "%20" PRIu64 " %-6s\n",
 		   "Total", stats->count, "",
 		   total_rec_len, psprintf("[%.02f%%]", rec_len_pct),
 		   total_fpi_len, psprintf("[%.02f%%]", fpi_len_pct),
diff --git a/src/bin/pgbench/pgbench.c b/src/bin/pgbench/pgbench.c
index 85e7b68baa3..c4c38099c5b 100644
--- a/src/bin/pgbench/pgbench.c
+++ b/src/bin/pgbench/pgbench.c
@@ -6568,13 +6568,13 @@ printResults(StatsData *total,
 					SimpleStats *cstats = &(*commands)->stats;
 
 					if (max_tries == 1)
-						printf("   %11.3f  %10" INT64_MODIFIER "d  %s\n",
+						printf("   %11.3f  %10" PRId64 " %s\n",
 							   (cstats->count > 0) ?
 							   1000.0 * cstats->sum / cstats->count : 0.0,
 							   (*commands)->failures,
 							   (*commands)->first_line);
 					else
-						printf("   %11.3f  %10" INT64_MODIFIER "d  %10" INT64_MODIFIER "d  %s\n",
+						printf("   %11.3f  %10" PRId64 " %10" PRId64 " %s\n",
 							   (cstats->count > 0) ?
 							   1000.0 * cstats->sum / cstats->count : 0.0,
 							   (*commands)->failures,
diff --git a/src/include/.gitignore b/src/include/.gitignore
index 51819fb4ddd..6e99e82fe0c 100644
--- a/src/include/.gitignore
+++ b/src/include/.gitignore
@@ -1,5 +1,3 @@
 /stamp-h
-/stamp-ext-h
 /pg_config.h
-/pg_config_ext.h
 /pg_config_os.h
diff --git a/src/include/Makefile b/src/include/Makefile
index b8b576a4de3..26332ff9cbc 100644
--- a/src/include/Makefile
+++ b/src/include/Makefile
@@ -13,7 +13,7 @@ top_builddir = ../..
 include $(top_builddir)/src/Makefile.global
 
 
-all: pg_config.h pg_config_ext.h pg_config_os.h
+all: pg_config.h pg_config_os.h
 
 
 # Subdirectories containing installable headers
@@ -32,7 +32,6 @@ install: all installdirs
 	$(INSTALL_DATA) $(srcdir)/postgres_ext.h   '$(DESTDIR)$(includedir)'
 	$(INSTALL_DATA) $(srcdir)/libpq/libpq-fs.h '$(DESTDIR)$(includedir)/libpq'
 	$(INSTALL_DATA) pg_config.h     '$(DESTDIR)$(includedir)'
-	$(INSTALL_DATA) pg_config_ext.h '$(DESTDIR)$(includedir)'
 	$(INSTALL_DATA) pg_config_os.h  '$(DESTDIR)$(includedir)'
 	$(INSTALL_DATA) $(srcdir)/pg_config_manual.h '$(DESTDIR)$(includedir)'
 # These headers are needed by the not-so-public headers of the interfaces.
@@ -43,7 +42,6 @@ install: all installdirs
 	$(INSTALL_DATA) $(srcdir)/libpq/protocol.h '$(DESTDIR)$(includedir_internal)/libpq'
 # These headers are needed for server-side development
 	$(INSTALL_DATA) pg_config.h     '$(DESTDIR)$(includedir_server)'
-	$(INSTALL_DATA) pg_config_ext.h '$(DESTDIR)$(includedir_server)'
 	$(INSTALL_DATA) pg_config_os.h  '$(DESTDIR)$(includedir_server)'
 	$(INSTALL_DATA) nodes/nodetags.h '$(DESTDIR)$(includedir_server)/nodes'
 	$(INSTALL_DATA) utils/errcodes.h '$(DESTDIR)$(includedir_server)/utils'
@@ -66,7 +64,7 @@ installdirs:
 
 
 uninstall:
-	rm -f $(addprefix '$(DESTDIR)$(includedir)'/, pg_config.h pg_config_ext.h pg_config_os.h pg_config_manual.h postgres_ext.h libpq/libpq-fs.h)
+	rm -f $(addprefix '$(DESTDIR)$(includedir)'/, pg_config.h pg_config_os.h pg_config_manual.h postgres_ext.h libpq/libpq-fs.h)
 	rm -f $(addprefix '$(DESTDIR)$(includedir_internal)'/, c.h port.h postgres_fe.h libpq/pqcomm.h libpq/protocol.h)
 # heuristic...
 	rm -rf $(addprefix '$(DESTDIR)$(includedir_server)'/, $(SUBDIRS) *.h)
@@ -80,4 +78,4 @@ clean:
 	$(MAKE) -C catalog clean
 
 distclean: clean
-	rm -f pg_config.h pg_config_ext.h pg_config_os.h stamp-h stamp-ext-h
+	rm -f pg_config.h pg_config_os.h stamp-h stamp-ext-h
diff --git a/src/include/c.h b/src/include/c.h
index 304dff27e34..734626e75a8 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -48,14 +48,12 @@
 
 #include "postgres_ext.h"
 
-/* Must undef pg_config_ext.h symbols before including pg_config.h */
-#undef PG_INT64_TYPE
-
 #include "pg_config.h"
 #include "pg_config_manual.h"	/* must be after pg_config.h */
 #include "pg_config_os.h"		/* must be before any system header files */
 
 /* System header files that should be available everywhere in Postgres */
+#include <inttypes.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -471,25 +469,15 @@ typedef void (*pg_funcptr_t) (void);
  */
 typedef char *Pointer;
 
-/*
- * intN
- *		Signed integer, EXACTLY N BITS IN SIZE,
- *		used for numerical computations and the
- *		frontend/backend protocol.
- */
-typedef signed char int8;		/* == 8 bits */
-typedef signed short int16;		/* == 16 bits */
-typedef signed int int32;		/* == 32 bits */
-
-/*
- * uintN
- *		Unsigned integer, EXACTLY N BITS IN SIZE,
- *		used for numerical computations and the
- *		frontend/backend protocol.
- */
-typedef unsigned char uint8;	/* == 8 bits */
-typedef unsigned short uint16;	/* == 16 bits */
-typedef unsigned int uint32;	/* == 32 bits */
+/* Historical names for types in <stdint.h>. */
+typedef int8_t int8;
+typedef int16_t int16;
+typedef int32_t int32;
+typedef int64_t int64;
+typedef uint8_t uint8;
+typedef uint16_t uint16;
+typedef uint32_t uint32;
+typedef uint64_t uint64;
 
 /*
  * bitsN
@@ -502,30 +490,14 @@ typedef uint32 bits32;			/* >= 32 bits */
 /*
  * 64-bit integers
  */
-#ifdef HAVE_LONG_INT_64
-/* Plain "long int" fits, use it */
-
-typedef long int int64;
-typedef unsigned long int uint64;
-#define INT64CONST(x)  (x##L)
-#define UINT64CONST(x) (x##UL)
-#elif defined(HAVE_LONG_LONG_INT_64)
-/* We have working support for "long long int", use that */
-
-typedef long long int int64;
-typedef unsigned long long int uint64;
-#define INT64CONST(x)  (x##LL)
-#define UINT64CONST(x) (x##ULL)
-#else
-/* neither HAVE_LONG_INT_64 nor HAVE_LONG_LONG_INT_64 */
-#error must have a working 64-bit integer datatype
-#endif
+#define INT64CONST(x)  INT64_C(x)
+#define UINT64CONST(x) UINT64_C(x)
 
 /* snprintf format strings to use for 64-bit integers */
-#define INT64_FORMAT "%" INT64_MODIFIER "d"
-#define UINT64_FORMAT "%" INT64_MODIFIER "u"
-#define INT64_HEX_FORMAT "%" INT64_MODIFIER "x"
-#define UINT64_HEX_FORMAT "%" INT64_MODIFIER "x"
+#define INT64_FORMAT "%" PRId64
+#define UINT64_FORMAT "%" PRIu64
+#define INT64_HEX_FORMAT "%" PRIx64
+#define UINT64_HEX_FORMAT "%" PRIx64
 
 /*
  * 128-bit signed and unsigned integers
@@ -554,22 +526,19 @@ typedef unsigned PG_INT128_TYPE uint128
 #endif
 #endif
 
-/*
- * stdint.h limits aren't guaranteed to have compatible types with our fixed
- * width types. So just define our own.
- */
-#define PG_INT8_MIN		(-0x7F-1)
-#define PG_INT8_MAX		(0x7F)
-#define PG_UINT8_MAX	(0xFF)
-#define PG_INT16_MIN	(-0x7FFF-1)
-#define PG_INT16_MAX	(0x7FFF)
-#define PG_UINT16_MAX	(0xFFFF)
-#define PG_INT32_MIN	(-0x7FFFFFFF-1)
-#define PG_INT32_MAX	(0x7FFFFFFF)
-#define PG_UINT32_MAX	(0xFFFFFFFFU)
-#define PG_INT64_MIN	(-INT64CONST(0x7FFFFFFFFFFFFFFF) - 1)
-#define PG_INT64_MAX	INT64CONST(0x7FFFFFFFFFFFFFFF)
-#define PG_UINT64_MAX	UINT64CONST(0xFFFFFFFFFFFFFFFF)
+/* Historical names for limits in <stdint.h>. */
+#define PG_INT8_MIN		INT8_MIN
+#define PG_INT8_MAX		INT8_MAX
+#define PG_UINT8_MAX	UINT8_MAX
+#define PG_INT16_MIN	INT16_MIN
+#define PG_INT16_MAX	INT16_MAX
+#define PG_UINT16_MAX	UINT16_MAX
+#define PG_INT32_MIN	INT32_MIN
+#define PG_INT32_MAX	INT32_MAX
+#define PG_UINT32_MAX	UINT32_MAX
+#define PG_INT64_MIN	INT64_MIN
+#define PG_INT64_MAX	INT64_MAX
+#define PG_UINT64_MAX	UINT64_MAX
 
 /*
  * We now always use int64 timestamps, but keep this symbol defined for the
@@ -1272,21 +1241,25 @@ extern int	fdatasync(int fildes);
  * definition of int64.  (For the naming, compare that POSIX has
  * strtoimax()/strtoumax() which return intmax_t/uintmax_t.)
  */
-#ifdef HAVE_LONG_INT_64
+#if SIZEOF_LONG == 8
 #define strtoi64(str, endptr, base) ((int64) strtol(str, endptr, base))
 #define strtou64(str, endptr, base) ((uint64) strtoul(str, endptr, base))
-#else
+#elif SIZEOF_LONG_LONG == 8
 #define strtoi64(str, endptr, base) ((int64) strtoll(str, endptr, base))
 #define strtou64(str, endptr, base) ((uint64) strtoull(str, endptr, base))
+#else
+#error "cannot find integer type of the same size as int64_t"
 #endif
 
 /*
  * Similarly, wrappers around labs()/llabs() matching our int64.
  */
-#ifdef HAVE_LONG_INT_64
+#if SIZEOF_LONG == 8
 #define i64abs(i) labs(i)
-#else
+#elif SIZEOF_LONG_LONG == 8
 #define i64abs(i) llabs(i)
+#else
+#error "cannot find integer type of the same size as int64_t"
 #endif
 
 /*
diff --git a/src/include/meson.build b/src/include/meson.build
index 58b7a9c1e7e..e691b12b8a0 100644
--- a/src/include/meson.build
+++ b/src/include/meson.build
@@ -1,14 +1,5 @@
 # Copyright (c) 2022-2024, PostgreSQL Global Development Group
 
-pg_config_ext = configure_file(
-  input: 'pg_config_ext.h.meson',
-  output: 'pg_config_ext.h',
-  configuration: cdata,
-  install: true,
-  install_dir: dir_include,
-)
-configure_files += pg_config_ext
-
 pg_config_os = configure_file(
   output: 'pg_config_os.h',
   input: files('port/@0@.h'.format(portname)),
@@ -116,7 +107,6 @@ install_headers(
   'postgres_fe.h',
   'varatt.h',
   'windowapi.h',
-  pg_config_ext,
   pg_config_os,
   pg_config,
   install_dir: dir_include_server,
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index ab0f8cc2b4a..07b2f798abd 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -9,12 +9,12 @@
 /* The normal alignment of `int', in bytes. */
 #undef ALIGNOF_INT
 
+/* The normal alignment of `int64_t', in bytes. */
+#undef ALIGNOF_INT64_T
+
 /* The normal alignment of `long', in bytes. */
 #undef ALIGNOF_LONG
 
-/* The normal alignment of `long long int', in bytes. */
-#undef ALIGNOF_LONG_LONG_INT
-
 /* The normal alignment of `PG_INT128_TYPE', in bytes. */
 #undef ALIGNOF_PG_INT128_TYPE
 
@@ -153,8 +153,8 @@
 /* Define to 1 if you have __sync_lock_test_and_set(int *) and friends. */
 #undef HAVE_GCC__SYNC_INT32_TAS
 
-/* Define to 1 if you have __sync_val_compare_and_swap(int64 *, int64, int64).
-   */
+/* Define to 1 if you have __sync_val_compare_and_swap(int64_t *, int64_t,
+   int64_t). */
 #undef HAVE_GCC__SYNC_INT64_CAS
 
 /* Define to 1 if you have the `getauxval' function. */
@@ -265,12 +265,6 @@
 /* Define to 1 if you have the `zstd' library (-lzstd). */
 #undef HAVE_LIBZSTD
 
-/* Define to 1 if `long int' works and is 64 bits. */
-#undef HAVE_LONG_INT_64
-
-/* Define to 1 if `long long int' works and is 64 bits. */
-#undef HAVE_LONG_LONG_INT_64
-
 /* Define to 1 if you have the <mbarrier.h> header file. */
 #undef HAVE_MBARRIER_H
 
@@ -544,9 +538,6 @@
 /* Define to 1 if your compiler understands _Static_assert. */
 #undef HAVE__STATIC_ASSERT
 
-/* Define to the appropriate printf length modifier for 64-bit ints. */
-#undef INT64_MODIFIER
-
 /* Define as the maximum alignment requirement of any C data type. */
 #undef MAXIMUM_ALIGNOF
 
@@ -578,9 +569,6 @@
 /* Define to the name of a signed 128-bit integer type. */
 #undef PG_INT128_TYPE
 
-/* Define to the name of a signed 64-bit integer type. */
-#undef PG_INT64_TYPE
-
 /* Define to the name of the default PostgreSQL service principal in Kerberos
    (GSSAPI). (--with-krb-srvnam=NAME) */
 #undef PG_KRB_SRVNAM
@@ -630,6 +618,9 @@
 /* The size of `long', as computed by sizeof. */
 #undef SIZEOF_LONG
 
+/* The size of `long long', as computed by sizeof. */
+#undef SIZEOF_LONG_LONG
+
 /* The size of `off_t', as computed by sizeof. */
 #undef SIZEOF_OFF_T
 
diff --git a/src/include/pg_config_ext.h.in b/src/include/pg_config_ext.h.in
deleted file mode 100644
index 8acadbdafd4..00000000000
--- a/src/include/pg_config_ext.h.in
+++ /dev/null
@@ -1,7 +0,0 @@
-/*
- * src/include/pg_config_ext.h.in.  This is generated manually, not by
- * autoheader, since we want to limit which symbols get defined here.
- */
-
-/* Define to the name of a signed 64-bit integer type. */
-#undef PG_INT64_TYPE
diff --git a/src/include/pg_config_ext.h.meson b/src/include/pg_config_ext.h.meson
deleted file mode 100644
index 57cdfca0cfd..00000000000
--- a/src/include/pg_config_ext.h.meson
+++ /dev/null
@@ -1,7 +0,0 @@
-/*
- * src/include/pg_config_ext.h.in.  This is generated manually, not by
- * autoheader, since we want to limit which symbols get defined here.
- */
-
-/* Define to the name of a signed 64-bit integer type. */
-#mesondefine PG_INT64_TYPE
diff --git a/src/include/port/pg_bitutils.h b/src/include/port/pg_bitutils.h
index 4d88478c9c2..a3cad46afe9 100644
--- a/src/include/port/pg_bitutils.h
+++ b/src/include/port/pg_bitutils.h
@@ -74,13 +74,13 @@ pg_leftmost_one_pos64(uint64 word)
 #ifdef HAVE__BUILTIN_CLZ
 	Assert(word != 0);
 
-#if defined(HAVE_LONG_INT_64)
+#if SIZEOF_LONG == 8
 	return 63 - __builtin_clzl(word);
-#elif defined(HAVE_LONG_LONG_INT_64)
+#elif SIZEOF_LONG_LONG == 8
 	return 63 - __builtin_clzll(word);
 #else
-#error must have a working 64-bit integer datatype
-#endif							/* HAVE_LONG_INT_64 */
+#error "cannot find integer type of the same size as uint64_t"
+#endif
 
 #elif defined(_MSC_VER) && (defined(_M_AMD64) || defined(_M_ARM64))
 	unsigned long result;
@@ -147,13 +147,13 @@ pg_rightmost_one_pos64(uint64 word)
 #ifdef HAVE__BUILTIN_CTZ
 	Assert(word != 0);
 
-#if defined(HAVE_LONG_INT_64)
+#if SIZEOF_LONG == 8
 	return __builtin_ctzl(word);
-#elif defined(HAVE_LONG_LONG_INT_64)
+#elif SIZEOF_LONG_LONG == 8
 	return __builtin_ctzll(word);
 #else
-#error must have a working 64-bit integer datatype
-#endif							/* HAVE_LONG_INT_64 */
+#error "cannot find integer type of the same size as uint64_t"
+#endif
 
 #elif defined(_MSC_VER) && (defined(_M_AMD64) || defined(_M_ARM64))
 	unsigned long result;
diff --git a/src/include/postgres_ext.h b/src/include/postgres_ext.h
index 240ad4e93bf..202eb049622 100644
--- a/src/include/postgres_ext.h
+++ b/src/include/postgres_ext.h
@@ -23,7 +23,7 @@
 #ifndef POSTGRES_EXT_H
 #define POSTGRES_EXT_H
 
-#include "pg_config_ext.h"
+#include <stdint.h>
 
 /*
  * Object ID is a fundamental type in Postgres.
@@ -44,7 +44,7 @@ typedef unsigned int Oid;
 
 
 /* Define a signed 64-bit integer type for use in client API declarations. */
-typedef PG_INT64_TYPE pg_int64;
+typedef int64_t pg_int64;
 
 /*
  * Identifiers of error message fields.  Kept here to keep common
diff --git a/src/include/utils/dsa.h b/src/include/utils/dsa.h
index 8dff964bf33..6c952a43f79 100644
--- a/src/include/utils/dsa.h
+++ b/src/include/utils/dsa.h
@@ -66,7 +66,7 @@ typedef pg_atomic_uint64 dsa_pointer_atomic;
 #define dsa_pointer_atomic_write pg_atomic_write_u64
 #define dsa_pointer_atomic_fetch_add pg_atomic_fetch_add_u64
 #define dsa_pointer_atomic_compare_exchange pg_atomic_compare_exchange_u64
-#define DSA_POINTER_FORMAT "%016" INT64_MODIFIER "x"
+#define DSA_POINTER_FORMAT "%016" PRIx64
 #endif
 
 /* Flags for dsa_allocate_extended. */
diff --git a/src/interfaces/ecpg/ecpglib/typename.c b/src/interfaces/ecpg/ecpglib/typename.c
index 1d482c4fa61..1fb9860371b 100644
--- a/src/interfaces/ecpg/ecpglib/typename.c
+++ b/src/interfaces/ecpg/ecpglib/typename.c
@@ -131,11 +131,12 @@ sqlda_dynamic_type(Oid type, enum COMPAT_MODE compat)
 		case INTERVALOID:
 			return ECPGt_interval;
 		case INT8OID:
-#ifdef HAVE_LONG_LONG_INT_64
-			return ECPGt_long_long;
-#endif
-#ifdef HAVE_LONG_INT_64
+#if SIZEOF_LONG == 8
 			return ECPGt_long;
+#elif SIZEOF_LONG_LONG == 8
+			return ECPGt_long_long;
+#else
+#error "cannot find integer type of the same size as INT8OID"
 #endif
 			/* Unhandled types always return a string */
 		default:
diff --git a/src/interfaces/ecpg/include/ecpg_config.h.in b/src/interfaces/ecpg/include/ecpg_config.h.in
index 75f542f263b..4af45930b61 100644
--- a/src/interfaces/ecpg/include/ecpg_config.h.in
+++ b/src/interfaces/ecpg/include/ecpg_config.h.in
@@ -1,8 +1,8 @@
 /* Define to 1 to build client libraries as thread-safe code. */
 #define ENABLE_THREAD_SAFETY 1
 
-/* Define to 1 if `long int' works and is 64 bits. */
-#undef HAVE_LONG_INT_64
+/* The size of `long', as computed by sizeof. */
+#undef SIZEOF_LONG
 
-/* Define to 1 if `long long int' works and is 64 bits. */
-#undef HAVE_LONG_LONG_INT_64
+/* The size of `long long', as computed by sizeof. */
+#undef SIZEOF_LONG_LONG
diff --git a/src/interfaces/ecpg/include/meson.build b/src/interfaces/ecpg/include/meson.build
index a3beb3cc7be..c1a88e73fb8 100644
--- a/src/interfaces/ecpg/include/meson.build
+++ b/src/interfaces/ecpg/include/meson.build
@@ -3,8 +3,8 @@
 ecpg_inc = include_directories('.')
 
 ecpg_conf_keys = [
-  'HAVE_LONG_INT_64',
-  'HAVE_LONG_LONG_INT_64',
+  'SIZEOF_LONG',
+  'SIZEOF_LONG_LONG',
 ]
 
 ecpg_conf_data = configuration_data()
diff --git a/src/interfaces/ecpg/include/pgtypes_interval.h b/src/interfaces/ecpg/include/pgtypes_interval.h
index 46cfce65517..f0acbb4512a 100644
--- a/src/interfaces/ecpg/include/pgtypes_interval.h
+++ b/src/interfaces/ecpg/include/pgtypes_interval.h
@@ -3,21 +3,17 @@
 #ifndef PGTYPES_INTERVAL
 #define PGTYPES_INTERVAL
 
+#include <stdint.h>
+
 #include <ecpg_config.h>
 #include <pgtypes.h>
 
 #ifndef C_H
 
-#ifdef HAVE_LONG_INT_64
-typedef long int int64;
-#elif defined(HAVE_LONG_LONG_INT_64)
-typedef long long int int64;
-#else
-/* neither HAVE_LONG_INT_64 nor HAVE_LONG_LONG_INT_64 */
-#error must have a working 64-bit integer datatype
-#endif
+typedef int64_t int64;
 
 #define HAVE_INT64_TIMESTAMP
+
 #endif							/* C_H */
 
 typedef struct
diff --git a/src/interfaces/ecpg/include/sqltypes.h b/src/interfaces/ecpg/include/sqltypes.h
index e7cbfa47956..498840458c4 100644
--- a/src/interfaces/ecpg/include/sqltypes.h
+++ b/src/interfaces/ecpg/include/sqltypes.h
@@ -46,12 +46,14 @@
 #define SQLINTERVAL		ECPGt_interval
 #define SQLNCHAR	ECPGt_char
 #define SQLNVCHAR	ECPGt_char
-#ifdef HAVE_LONG_LONG_INT_64
+#if SIZEOF_LONG == 8
+#define SQLINT8		ECPGt_long
+#define SQLSERIAL8	ECPGt_long
+#elif SIZEOF_LONG_LONG == 8
 #define SQLINT8		ECPGt_long_long
 #define SQLSERIAL8	ECPGt_long_long
 #else
-#define SQLINT8		ECPGt_long
-#define SQLSERIAL8	ECPGt_long
+#error "cannot find integer type of the same size as SQLINT8"
 #endif
 
 #endif							/* ndef ECPG_SQLTYPES_H */
diff --git a/src/interfaces/ecpg/test/expected/compat_informix-sqlda.c b/src/interfaces/ecpg/test/expected/compat_informix-sqlda.c
index 7e19319d27f..8eebc51664e 100644
--- a/src/interfaces/ecpg/test/expected/compat_informix-sqlda.c
+++ b/src/interfaces/ecpg/test/expected/compat_informix-sqlda.c
@@ -97,12 +97,14 @@ typedef struct sqlda_struct sqlda_t;
 #define SQLINTERVAL		ECPGt_interval
 #define SQLNCHAR	ECPGt_char
 #define SQLNVCHAR	ECPGt_char
-#ifdef HAVE_LONG_LONG_INT_64
+#if SIZEOF_LONG == 8
+#define SQLINT8		ECPGt_long
+#define SQLSERIAL8	ECPGt_long
+#elif SIZEOF_LONG_LONG == 8
 #define SQLINT8		ECPGt_long_long
 #define SQLSERIAL8	ECPGt_long_long
 #else
-#define SQLINT8		ECPGt_long
-#define SQLSERIAL8	ECPGt_long
+#error "cannot find integer type of the same size as SQLINT8"
 #endif
 
 #endif							/* ndef ECPG_SQLTYPES_H */
diff --git a/src/port/pg_bitutils.c b/src/port/pg_bitutils.c
index 87f56e82b80..c8399981ee0 100644
--- a/src/port/pg_bitutils.c
+++ b/src/port/pg_bitutils.c
@@ -370,12 +370,12 @@ static inline int
 pg_popcount64_slow(uint64 word)
 {
 #ifdef HAVE__BUILTIN_POPCOUNT
-#if defined(HAVE_LONG_INT_64)
+#if SIZEOF_LONG == 8
 	return __builtin_popcountl(word);
-#elif defined(HAVE_LONG_LONG_INT_64)
+#elif SIZEOF_LONG_LONG == 8
 	return __builtin_popcountll(word);
 #else
-#error must have a working 64-bit integer datatype
+#error "cannot find integer of the same size as uint64_t"
 #endif
 #else							/* !HAVE__BUILTIN_POPCOUNT */
 	int			result = 0;
diff --git a/src/port/snprintf.c b/src/port/snprintf.c
index 884f0262dd1..c21af2fb2e7 100644
--- a/src/port/snprintf.c
+++ b/src/port/snprintf.c
@@ -560,6 +560,28 @@ nextch2:
 					fmtpos = accum;
 				accum = 0;
 				goto nextch2;
+#ifdef WIN32
+			case 'I':
+				/* Windows PRI*{32,64,PTR} size */
+				if (format[0] == '3' && format[1] == '2')
+					format += 2;
+				else if (format[0] == '6' && format[1] == '4')
+				{
+					format += 2;
+					longlongflag = 1;
+				}
+				else
+				{
+#if SIZEOF_VOID_P == SIZEOF_LONG
+				longflag = 1;
+#elif SIZEOF_VOID_P == SIZEOF_LONG_LONG
+				longlongflag = 1;
+#else
+#error "cannot find integer type of the same size as intptr_t"
+#endif
+				}
+				goto nextch2;
+#endif
 			case 'l':
 				if (longflag)
 					longlongflag = 1;
@@ -567,16 +589,12 @@ nextch2:
 					longflag = 1;
 				goto nextch2;
 			case 'z':
-#if SIZEOF_SIZE_T == 8
-#ifdef HAVE_LONG_INT_64
+#if SIZEOF_SIZE_T == SIZEOF_LONG
 				longflag = 1;
-#elif defined(HAVE_LONG_LONG_INT_64)
+#elif SIZEOF_SIZE_T == SIZEOF_LONG_LONG
 				longlongflag = 1;
 #else
-#error "Don't know how to print 64bit integers"
-#endif
-#else
-				/* assume size_t is same size as int */
+#error "cannot find integer type of the same size as size_t"
 #endif
 				goto nextch2;
 			case 'h':
@@ -827,6 +845,28 @@ nextch1:
 					fmtpos = accum;
 				accum = 0;
 				goto nextch1;
+#ifdef WIN32
+			case 'I':
+				/* Windows PRI*{32,64,PTR} size */
+				if (format[0] == '3' && format[1] == '2')
+					format += 2;
+				else if (format[0] == '6' && format[1] == '4')
+				{
+					format += 2;
+					longlongflag = 1;
+				}
+				else
+				{
+#if SIZEOF_VOID_P == SIZEOF_LONG
+				longflag = 1;
+#elif SIZEOF_VOID_P == SIZEOF_LONG_LONG
+				longlongflag = 1;
+#else
+#error "cannot find integer type of the same size as intptr_t"
+#endif
+				}
+				goto nextch1;
+#endif
 			case 'l':
 				if (longflag)
 					longlongflag = 1;
@@ -834,16 +874,12 @@ nextch1:
 					longflag = 1;
 				goto nextch1;
 			case 'z':
-#if SIZEOF_SIZE_T == 8
-#ifdef HAVE_LONG_INT_64
+#if SIZEOF_SIZE_T == SIZEOF_LONG
 				longflag = 1;
-#elif defined(HAVE_LONG_LONG_INT_64)
+#elif SIZEOF_SIZE_T == SIZEOF_LONG_LONG
 				longlongflag = 1;
 #else
-#error "Don't know how to print 64bit integers"
-#endif
-#else
-				/* assume size_t is same size as int */
+#error "cannot find integer type of the same size as size_t"
 #endif
 				goto nextch1;
 			case 'h':
-- 
2.47.0

