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# visibility.m4 serial 1 (gettext-0.15)
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.])
])
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