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| author | Jelmer Vernooij <jelmer@samba.org> | 2006-03-06 21:14:41 +0000 |
|---|---|---|
| committer | Gerald (Jerry) Carter <jerry@samba.org> | 2007-10-10 13:52:20 -0500 |
| commit | ce3032cab82fd66ddfd4d55d7cc242aff80be161 (patch) | |
| tree | 7a13b9a20a34ef79c17abc38cc9752149d94a5fc /source4/build/m4 | |
| parent | 148403594be03ab0ca8e396ef22cd01ef19921d5 (diff) | |
| download | samba-ce3032cab82fd66ddfd4d55d7cc242aff80be161.tar.gz samba-ce3032cab82fd66ddfd4d55d7cc242aff80be161.tar.bz2 samba-ce3032cab82fd66ddfd4d55d7cc242aff80be161.zip | |
r13898: Add a subsystem-specific DEFAULT_VISIBILITY property that can be used
to not export symbols when building shared libraries. Symbols that have to be
available to users of the library can be explicitly exported by
prepending them with _PUBLIC_ in the C source.
(This used to be commit ea9988dfda6df09f1ee8f9aea1dc5b96fff52ee6)
Diffstat (limited to 'source4/build/m4')
| -rw-r--r-- | source4/build/m4/check_cc.m4 | 32 |
1 files changed, 12 insertions, 20 deletions
diff --git a/source4/build/m4/check_cc.m4 b/source4/build/m4/check_cc.m4 index 219dc6ad37..33bb7050af 100644 --- a/source4/build/m4/check_cc.m4 +++ b/source4/build/m4/check_cc.m4 @@ -39,15 +39,11 @@ AC_CACHE_CHECK([that the C compiler can precompile header files],samba_cv_precom dnl Check whether the compiler can generate precompiled headers touch conftest.h if ${CC-cc} conftest.h 2> /dev/null && test -f conftest.h.gch; then - samba_cv_precompiled_headers=yes + precompiled_headers=yes else - samba_cv_precompiled_headers=no + precompiled_headers=no fi]) -PCH_AVAILABLE="#" -if test x"$samba_cv_precompiled_headers" = x"yes"; then - PCH_AVAILABLE="" -fi -AC_SUBST(PCH_AVAILABLE) +AC_SUBST(precompiled_headers) dnl Check if the C compiler understands volatile (it should, being ANSI). @@ -119,23 +115,19 @@ AC_TRY_RUN([#include "${srcdir-.}/build/tests/trivial.c"], # # Check if the compiler support ELF visibility for symbols # -if test x"$GCC" = x"yes" ; then - AX_CFLAGS_GCC_OPTION([-fvisibility=hidden], VISIBILITY_CFLAGS) -fi -if test -n "$VISIBILITY_CFLAGS"; then - OLD_CFLAGS="${CFLAGS}" - CFLAGS="${CFLAGS} ${VISIBILITY_CFLAGS}" - AC_MSG_CHECKING([whether the C compiler supports the visibility attribute]) - AC_TRY_RUN([ +visibility_attribute=no +AC_MSG_CHECKING([whether the C compiler supports the visibility attribute]) +AC_TRY_RUN([ #pragma GCC visibility push(hidden) void vis_foo1(void) {} __attribute__((visibility("default"))) void vis_foo2(void) {} #include "${srcdir-.}/build/tests/trivial.c" -], [AC_MSG_RESULT(yes); -AC_DEFINE(HAVE_VISIBILITY_ATTR,1,[Whether the C compiler supports the visibility attribute])], -[AC_MSG_RESULT(no);VISIBILITY_CFLAGS=""]) - CFLAGS="${OLD_CFLAGS}" -fi +], [ + AC_MSG_RESULT(yes) + AC_DEFINE(HAVE_VISIBILITY_ATTR,1,[Whether the C compiler supports the visibility attribute]) + visibility_attribute=yes +], [AC_MSG_RESULT(no);]) +AC_SUBST(visibility_attribute) # # Check if the compiler can handle the options we selected by |