diff options
Diffstat (limited to 'unix/tcl.m4')
| -rw-r--r-- | unix/tcl.m4 | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/unix/tcl.m4 b/unix/tcl.m4 index 34a06bd..c5045c7 100644 --- a/unix/tcl.m4 +++ b/unix/tcl.m4 @@ -1052,16 +1052,24 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [ AC_CACHE_CHECK([if compiler supports visibility "hidden"], tcl_cv_cc_visibility_hidden, [ + hold_cflags=$CFLAGS; CFLAGS="$CFLAGS -fvisibility=hidden" + AC_TRY_COMPILE(,, tcl_cv_cc_visibility_hidden=yes, + tcl_cv_cc_visibility_hidden=no) + CFLAGS=$hold_cflags]) + AS_IF([test $tcl_cv_cc_visibility_hidden = yes], [ + CFLAGS="$CFLAGS -fvisibility=hidden" + ], [ hold_cflags=$CFLAGS; CFLAGS="$CFLAGS -Werror" AC_TRY_LINK([ extern __attribute__((__visibility__("hidden"))) void f(void); void f(void) {}], [f();], tcl_cv_cc_visibility_hidden=yes, tcl_cv_cc_visibility_hidden=no) - CFLAGS=$hold_cflags]) - AS_IF([test $tcl_cv_cc_visibility_hidden = yes], [ - AC_DEFINE(MODULE_SCOPE, - [extern __attribute__((__visibility__("hidden")))], - [Compiler support for module scope symbols]) + CFLAGS=$hold_cflags + AS_IF([test $tcl_cv_cc_visibility_hidden = yes], [ + AC_DEFINE(MODULE_SCOPE, + [extern __attribute__((__visibility__("hidden")))], + [Compiler support for module scope symbols]) + ]) ]) # Step 0.d: Disable -rpath support? |