diff options
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/gcc4_visibility.m4 | 21 | ||||
| -rw-r--r-- | m4/visibility.m4 | 52 |
2 files changed, 21 insertions, 52 deletions
diff --git a/m4/gcc4_visibility.m4 b/m4/gcc4_visibility.m4 new file mode 100644 index 0000000..84959f3 --- /dev/null +++ b/m4/gcc4_visibility.m4 @@ -0,0 +1,21 @@ + +# GCC 4.x -fvisibility=hidden + +AC_DEFUN([CHECK_GCC_FVISIBILITY], [ + AC_LANG_PUSH([C]) + saved_CFLAGS="$CFLAGS" + CFLAGS="$saved_CFLAGS -fvisibility=hidden" + AC_CACHE_CHECK([whether compiler accepts -fvisibility=hidden], + [ac_cv_fvisibility_hidden], AC_COMPILE_IFELSE( + AC_LANG_PROGRAM([], []), + [ac_cv_fvisibility_hidden=yes], + [ac_cv_fvisibility_hidden=no] + )) + if test "$ac_cv_fvisibility_hidden" = "yes"; then + AC_DEFINE([HAVE_VISIBILITY_HIDDEN], [1], + [True if compiler supports -fvisibility=hidden]) + AC_SUBST([GCC_FVISIBILITY_HIDDEN], [-fvisibility=hidden]) + fi + CFLAGS="$saved_CFLAGS" + AC_LANG_POP([C]) +]) diff --git a/m4/visibility.m4 b/m4/visibility.m4 deleted file mode 100644 index 2ff6330..0000000 --- a/m4/visibility.m4 +++ /dev/null @@ -1,52 +0,0 @@ -# visibility.m4 serial 1 (gettext-0.15) -dnl Copyright (C) 2005 Free Software Foundation, Inc. -dnl This file is free software; the Free Software Foundation -dnl gives unlimited permission to copy and/or distribute it, -dnl with or without modifications, as long as this notice is preserved. - -dnl From Bruno Haible. - -dnl Tests whether the compiler supports the command-line option -dnl -fvisibility=hidden and the function and variable attributes -dnl __attribute__((__visibility__("hidden"))) and -dnl __attribute__((__visibility__("default"))). -dnl Does *not* test for __visibility__("protected") - which has tricky -dnl semantics (see the 'vismain' test in glibc) and does not exist e.g. on -dnl MacOS X. -dnl Does *not* test for __visibility__("internal") - which has processor -dnl dependent semantics. -dnl Does *not* test for #pragma GCC visibility push(hidden) - which is -dnl "really only recommended for legacy code". -dnl Set the variable CFLAG_VISIBILITY. -dnl Defines and sets the variable HAVE_VISIBILITY. - -AC_DEFUN([gl_VISIBILITY], -[ - AC_REQUIRE([AC_PROG_CC]) - CFLAG_VISIBILITY= - HAVE_VISIBILITY=0 - if test -n "$GCC"; then - AC_MSG_CHECKING([for simple visibility declarations]) - AC_CACHE_VAL(gl_cv_cc_visibility, [ - gl_save_CFLAGS="$CFLAGS" - CFLAGS="$CFLAGS -fvisibility=hidden" - AC_TRY_COMPILE( - [extern __attribute__((__visibility__("hidden"))) int hiddenvar; - extern __attribute__((__visibility__("default"))) int exportedvar; - extern __attribute__((__visibility__("hidden"))) int hiddenfunc (void); - extern __attribute__((__visibility__("default"))) int exportedfunc (void);], - [], - gl_cv_cc_visibility=yes, - gl_cv_cc_visibility=no) - CFLAGS="$gl_save_CFLAGS"]) - AC_MSG_RESULT([$gl_cv_cc_visibility]) - if test $gl_cv_cc_visibility = yes; then - CFLAG_VISIBILITY="-fvisibility=hidden" - HAVE_VISIBILITY=1 - fi - fi - AC_SUBST([CFLAG_VISIBILITY]) - AC_SUBST([HAVE_VISIBILITY]) - AC_DEFINE_UNQUOTED([HAVE_VISIBILITY], [$HAVE_VISIBILITY], - [Define to 1 or 0, depending whether the compiler supports simple visibility declarations.]) -]) |