Remove traces of support for Sun Studio compiler

Per discussion, this compiler suite is no longer maintained, and
it has not been able to compile PostgreSQL since at least PostgreSQL
17.

This removes all the remaining support code for this compiler.

Note that the Solaris operating system continues to be supported, but
using GCC as the compiler.

Reviewed-by: Andres Freund <[email protected]>
Reviewed-by: Tom Lane <[email protected]>
Discussion: https://www.postgresql.org/message-id/flat/a0f817ee-fb86-483a-8a14-b6f7f5991b6e%40eisentraut.org

4 files changed, 1 insertions, 113 deletions

diff --git a/src/backend/port/Makefile b/src/backend/port/Makefile
index 47338d99229..8613ac01aff 100644
--- a/src/backend/port/Makefile
+++ b/src/backend/port/Makefile
@@ -22,7 +22,6 @@ top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
 OBJS = \
-	$(TAS) \
 	atomics.o \
 	pg_sema.o \
 	pg_shmem.o
@@ -33,16 +32,5 @@ endif
 
 include $(top_srcdir)/src/backend/common.mk
 
-tas.o: tas.s
-ifeq ($(SUN_STUDIO_CC), yes)
-# preprocess assembler file with cpp
-	$(CC) $(CFLAGS) -c -P $<
-	mv $*.i $*_cpp.s
-	$(CC) $(CFLAGS) -c $*_cpp.s -o $@
-else
-	$(CC) $(CFLAGS) -c $<
-endif
-
 clean:
-	rm -f tas_cpp.s
 	$(MAKE) -C win32 clean
diff --git a/src/backend/port/tas/sunstudio_sparc.s b/src/backend/port/tas/sunstudio_sparc.s
deleted file mode 100644
index 8e0a0965b64..00000000000
--- a/src/backend/port/tas/sunstudio_sparc.s
+++ /dev/null
@@ -1,53 +0,0 @@
-!-------------------------------------------------------------------------
-!
-! sunstudio_sparc.s
-!	  compare and swap for Sun Studio on Sparc
-!
-! Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
-! Portions Copyright (c) 1994, Regents of the University of California
-!
-! IDENTIFICATION
-!	  src/backend/port/tas/sunstudio_sparc.s
-!
-!-------------------------------------------------------------------------
-
-! Fortunately the Sun compiler can process cpp conditionals with -P
-
-! '/' is the comment for x86, while '!' is the comment for Sparc
-
-#if defined(__sparcv9) || defined(__sparc)
-
-	.section        ".text"
-	.align  8
-	.skip   24
-	.align  4
-
-	.global pg_atomic_cas
-pg_atomic_cas:
-
-	! "cas" only works on sparcv9 and sparcv8plus chips, and
-	! requires a compiler targeting these CPUs.  It will fail
-	! on a compiler targeting sparcv8, and of course will not
-	! be understood by a sparcv8 CPU.  gcc continues to use
-	! "ldstub" because it targets sparcv7.
-	!
-	! There is actually a trick for embedding "cas" in a
-	! sparcv8-targeted compiler, but it can only be run
-	! on a sparcv8plus/v9 cpus:
-	!
-	!   http://cvs.opensolaris.org/source/xref/on/usr/src/lib/libc/sparc/threads/sparc.il
-	!
-	! NB: We're assuming we're running on a TSO system here - solaris
-	! userland luckily always has done so.
-
-#if defined(__sparcv9) || defined(__sparcv8plus)
-	cas     [%o0],%o2,%o1
-#else
-	ldstub [%o0],%o1
-#endif
-	mov     %o1,%o0
-	retl
-	nop
-	.type   pg_atomic_cas,2
-	.size   pg_atomic_cas,(.-pg_atomic_cas)
-#endif
diff --git a/src/backend/port/tas/sunstudio_x86.s b/src/backend/port/tas/sunstudio_x86.s
deleted file mode 100644
index 0111ffde45c..00000000000
--- a/src/backend/port/tas/sunstudio_x86.s
+++ /dev/null
@@ -1,43 +0,0 @@
-/-------------------------------------------------------------------------
-/
-/ sunstudio_x86.s
-/	  compare and swap for Sun Studio on x86
-/
-/ Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
-/ Portions Copyright (c) 1994, Regents of the University of California
-/
-/ IDENTIFICATION
-/	  src/backend/port/tas/sunstudio_x86.s
-/
-/-------------------------------------------------------------------------
-
-/ Fortunately the Sun compiler can process cpp conditionals with -P
-
-/ '/' is the comment for x86, while '!' is the comment for Sparc
-
-	.file   "tas.s"
-
-#if defined(__amd64)
-	.code64
-#endif
-
-	.globl pg_atomic_cas
-	.type pg_atomic_cas, @function
-
-	.section .text, "ax"
-	.align 16
-
-pg_atomic_cas:
-#if defined(__amd64)
-	movl       %edx,%eax
-	lock
-	cmpxchgl   %esi,(%rdi)
-#else
-	movl    4(%esp), %edx
-	movl    8(%esp), %ecx
-	movl    12(%esp), %eax
-	lock
-	cmpxchgl %ecx, (%edx)
-#endif
-	ret
-	.size pg_atomic_cas, . - pg_atomic_cas
diff --git a/src/backend/storage/lmgr/Makefile b/src/backend/storage/lmgr/Makefile
index 6cbaf23b855..a5fbc24ddad 100644
--- a/src/backend/storage/lmgr/Makefile
+++ b/src/backend/storage/lmgr/Makefile
@@ -24,13 +24,9 @@ OBJS = \
 
 include $(top_srcdir)/src/backend/common.mk
 
-ifdef TAS
-TASPATH = $(top_builddir)/src/backend/port/tas.o
-endif
-
 s_lock_test: s_lock.c $(top_builddir)/src/common/libpgcommon.a $(top_builddir)/src/port/libpgport.a
 	$(CC) $(CPPFLAGS) $(CFLAGS) -DS_LOCK_TEST=1 $(srcdir)/s_lock.c \
-		$(TASPATH) -L $(top_builddir)/src/common -lpgcommon \
+		-L $(top_builddir)/src/common -lpgcommon \
 		-L $(top_builddir)/src/port -lpgport -lm -o s_lock_test
 
 lwlocknames.h: ../../../include/storage/lwlocklist.h ../../utils/activity/wait_event_names.txt generate-lwlocknames.pl