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File visibility.m4

# visibility.m4 serial 5 (gettext-0.18.2)
dnl Copyright (C) 2005, 2008, 2010-2016 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 Mac OS 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
    dnl First, check whether -Werror can be added to the command line, or
    dnl whether it leads to an error because of some other option that the
    dnl user has put into $CC $CFLAGS $CPPFLAGS.
    AC_MSG_CHECKING([whether the -Werror option is usable])
    AC_CACHE_VAL([gl_cv_cc_vis_werror], [
      gl_save_CFLAGS="$CFLAGS"
      CFLAGS="$CFLAGS -Werror"
      AC_COMPILE_IFELSE(
        [AC_LANG_PROGRAM([[]], [[]])],
        [gl_cv_cc_vis_werror=yes],
        [gl_cv_cc_vis_werror=no])
      CFLAGS="$gl_save_CFLAGS"])
    AC_MSG_RESULT([$gl_cv_cc_vis_werror])
    dnl Now check whether visibility declarations are supported.
    AC_MSG_CHECKING([for simple visibility declarations])
    AC_CACHE_VAL([gl_cv_cc_visibility], [
      gl_save_CFLAGS="$CFLAGS"
      CFLAGS="$CFLAGS -fvisibility=hidden"
      dnl We use the option -Werror and a function dummyfunc, because on some
      dnl platforms (Cygwin 1.7) the use of -fvisibility triggers a warning
      dnl "visibility attribute not supported in this configuration; ignored"
      dnl at the first function definition in every compilation unit, and we
      dnl don't want to use the option in this case.
      if test $gl_cv_cc_vis_werror = yes; then
        CFLAGS="$CFLAGS -Werror"
      fi
      AC_COMPILE_IFELSE(
        [AC_LANG_PROGRAM(
           [[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);
             void dummyfunc (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.])
])

Name	Type	Size	Permission	Last Modified	Actions
.	DIR	-	drwxr-xr-x	2025-08-28 10:58:31
..	DIR	-	drwxr-xr-x	2025-10-16 10:59:21
bison-i18n.m4	text/x-m4	1.88 KB	-rw-r--r--	2019-10-12 12:28:39
codeset.m4	text/x-m4	842 B	-rw-r--r--	2016-03-20 07:37:53
extern-inline.m4	text/x-m4	4.27 KB	-rw-r--r--	2016-05-28 12:29:03
fcntl-o.m4	text/x-m4	4.56 KB	-rw-r--r--	2016-03-20 07:37:53
fontutil.m4	text/x-m4	13.83 KB	-rw-r--r--	2021-10-09 11:41:50
freetype2.m4	text/x-c	6.18 KB	-rw-r--r--	2018-04-22 09:41:36
gettext.m4	text/x-c	15.49 KB	-rw-r--r--	2016-05-28 12:29:03
glibc2.m4	text/x-c	830 B	-rw-r--r--	2016-03-20 07:37:53
glibc21.m4	text/x-c	907 B	-rw-r--r--	2016-03-20 07:37:53
gpg-error.m4	text/x-m4	4.65 KB	-rw-r--r--	2019-10-12 12:20:46
gpgrt.m4	text/x-m4	4.61 KB	-rw-r--r--	2019-10-12 12:20:46
iconv.m4	text/x-c	9.06 KB	-rw-r--r--	2016-03-20 07:37:53
intdiv0.m4	text/x-c	2.35 KB	-rw-r--r--	2016-05-28 12:29:03
intl.m4	text/x-m4	11.84 KB	-rw-r--r--	2016-03-20 07:37:53
intldir.m4	text/x-m4	917 B	-rw-r--r--	2016-03-20 07:37:53
intlmacosx.m4	text/x-m4	2.47 KB	-rw-r--r--	2016-03-20 07:37:53
intmax.m4	text/x-c	1.1 KB	-rw-r--r--	2016-03-20 07:37:53
inttypes-pri.m4	text/x-c	1.22 KB	-rw-r--r--	2016-03-20 07:37:53
inttypes_h.m4	text/x-c	1020 B	-rw-r--r--	2016-03-20 07:37:53
lcmessage.m4	text/x-m4	1.33 KB	-rw-r--r--	2016-03-20 07:37:53
lib-ld.m4	text/x-m4	3.6 KB	-rw-r--r--	2016-06-11 12:59:32
lib-link.m4	text/x-m4	32.28 KB	-rw-r--r--	2016-06-11 12:59:32
lib-prefix.m4	text/x-m4	8.27 KB	-rw-r--r--	2016-06-11 12:59:32
libgcrypt.m4	text/x-m4	6.09 KB	-rw-r--r--	2022-06-28 11:54:07
libtool.m4	text/x-m4	298.69 KB	-rw-r--r--	2019-10-11 02:55:28
libxml.m4	text/x-c	7.7 KB	-rw-r--r--	2017-07-23 05:10:06
libxslt.m4	text/x-c	7.93 KB	-rw-r--r--	2009-05-12 06:29:34
lock.m4	text/x-m4	1.43 KB	-rw-r--r--	2016-03-20 07:37:53
longlong.m4	text/x-m4	4.63 KB	-rw-r--r--	2016-03-20 07:37:53
ltargz.m4	text/x-m4	2.51 KB	-rw-r--r--	2019-10-11 02:55:28
ltdl.m4	text/x-Algol68	29.33 KB	-rw-r--r--	2019-10-11 02:55:28
ltoptions.m4	text/x-m4	14.17 KB	-rw-r--r--	2019-10-11 02:55:28
ltsugar.m4	text/plain	4.28 KB	-rw-r--r--	2019-10-11 02:55:28
ltversion.m4	text/plain	699 B	-rw-r--r--	2019-10-11 02:55:28
lt~obsolete.m4	text/plain	6 KB	-rw-r--r--	2019-10-11 02:55:28
mysql.m4	text/x-m4	4.12 KB	-rw-r--r--	2025-07-28 03:52:28
nls.m4	text/x-m4	1.19 KB	-rw-r--r--	2016-03-20 07:37:53
pkg.m4	text/x-m4	12.37 KB	-rw-r--r--	2017-03-24 05:16:18
po.m4	text/x-m4	18.52 KB	-rw-r--r--	2016-03-20 07:37:53
printf-posix.m4	text/x-c	1.54 KB	-rw-r--r--	2016-03-20 07:37:53
progtest.m4	text/x-m4	3.02 KB	-rw-r--r--	2016-03-20 07:37:53
size_max.m4	text/x-c	2.99 KB	-rw-r--r--	2016-03-20 07:37:53
stdint_h.m4	text/x-m4	995 B	-rw-r--r--	2016-03-20 07:37:53
threadlib.m4	text/x-c	14.8 KB	-rw-r--r--	2016-03-20 07:37:53
uintmax_t.m4	text/x-m4	1.09 KB	-rw-r--r--	2016-03-20 07:37:53
visibility.m4	text/x-m4	3.27 KB	-rw-r--r--	2016-03-20 07:37:53
wchar_t.m4	text/x-m4	818 B	-rw-r--r--	2016-03-20 07:37:53
wint_t.m4	text/x-c	1.03 KB	-rw-r--r--	2016-03-20 07:37:53
xsize.m4	text/x-m4	406 B	-rw-r--r--	2016-03-20 07:37:53

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