win32ole: separate global variable declarations and definitions

https://gcc.gnu.org/gcc-10/changes.html#c

> * GCC now defaults to `-fno-common`.  As a result, global
>   variable accesses are more efficient on various targets.  In
>   C, global variables with multiple tentative definitions now
>   result in linker errors.  With `-fcommon` such definitions are
>   silently merged during linking.

1 files changed, 2 insertions, 0 deletions

diff --git a/ext/win32ole/win32ole_variable.c b/ext/win32ole/win32ole_variable.c
index 3dc9972ee7..803083156c 100644
--- a/ext/win32ole/win32ole_variable.c
+++ b/ext/win32ole/win32ole_variable.c
@@ -365,6 +365,8 @@ folevariable_inspect(VALUE self)
     return make_inspect("WIN32OLE_VARIABLE", detail);
 }
 
+VALUE cWIN32OLE_VARIABLE;
+
 void Init_win32ole_variable(void)
 {
     cWIN32OLE_VARIABLE = rb_define_class("WIN32OLE_VARIABLE", rb_cObject);