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-# 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.])
-])