82 lines
3.6 KiB
Diff
82 lines
3.6 KiB
Diff
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diff -uNr gtk-3.22.30/m4/visibility.m4 gtk-3.22.30.mod/m4/visibility.m4
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--- gtk-3.22.30/m4/visibility.m4 1970-01-01 03:00:00.000000000 +0300
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+++ gtk-3.22.30.mod/m4/visibility.m4 2018-06-22 20:55:46.577959588 +0300
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@@ -0,0 +1,77 @@
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+# visibility.m4 serial 5 (gettext-0.18.2)
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+dnl Copyright (C) 2005, 2008, 2010-2015 Free Software Foundation, Inc.
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+dnl This file is free software; the Free Software Foundation
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+dnl gives unlimited permission to copy and/or distribute it,
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+dnl with or without modifications, as long as this notice is preserved.
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+
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+dnl From Bruno Haible.
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+
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+dnl Tests whether the compiler supports the command-line option
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+dnl -fvisibility=hidden and the function and variable attributes
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+dnl __attribute__((__visibility__("hidden"))) and
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+dnl __attribute__((__visibility__("default"))).
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+dnl Does *not* test for __visibility__("protected") - which has tricky
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+dnl semantics (see the 'vismain' test in glibc) and does not exist e.g. on
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+dnl Mac OS X.
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+dnl Does *not* test for __visibility__("internal") - which has processor
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+dnl dependent semantics.
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+dnl Does *not* test for #pragma GCC visibility push(hidden) - which is
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+dnl "really only recommended for legacy code".
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+dnl Set the variable CFLAG_VISIBILITY.
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+dnl Defines and sets the variable HAVE_VISIBILITY.
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+
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+AC_DEFUN([gl_VISIBILITY],
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+[
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+ AC_REQUIRE([AC_PROG_CC])
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+ CFLAG_VISIBILITY=
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+ HAVE_VISIBILITY=0
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+ if test -n "$GCC"; then
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+ dnl First, check whether -Werror can be added to the command line, or
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+ dnl whether it leads to an error because of some other option that the
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+ dnl user has put into $CC $CFLAGS $CPPFLAGS.
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+ AC_MSG_CHECKING([whether the -Werror option is usable])
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+ AC_CACHE_VAL([gl_cv_cc_vis_werror], [
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+ gl_save_CFLAGS="$CFLAGS"
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+ CFLAGS="$CFLAGS -Werror"
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+ AC_COMPILE_IFELSE(
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+ [AC_LANG_PROGRAM([[]], [[]])],
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+ [gl_cv_cc_vis_werror=yes],
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+ [gl_cv_cc_vis_werror=no])
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+ CFLAGS="$gl_save_CFLAGS"])
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+ AC_MSG_RESULT([$gl_cv_cc_vis_werror])
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+ dnl Now check whether visibility declarations are supported.
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+ AC_MSG_CHECKING([for simple visibility declarations])
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+ AC_CACHE_VAL([gl_cv_cc_visibility], [
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+ gl_save_CFLAGS="$CFLAGS"
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+ CFLAGS="$CFLAGS -fvisibility=hidden"
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+ dnl We use the option -Werror and a function dummyfunc, because on some
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+ dnl platforms (Cygwin 1.7) the use of -fvisibility triggers a warning
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+ dnl "visibility attribute not supported in this configuration; ignored"
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+ dnl at the first function definition in every compilation unit, and we
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+ dnl don't want to use the option in this case.
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+ if test $gl_cv_cc_vis_werror = yes; then
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+ CFLAGS="$CFLAGS -Werror"
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+ fi
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+ AC_COMPILE_IFELSE(
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+ [AC_LANG_PROGRAM(
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+ [[extern __attribute__((__visibility__("hidden"))) int hiddenvar;
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+ extern __attribute__((__visibility__("default"))) int exportedvar;
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+ extern __attribute__((__visibility__("hidden"))) int hiddenfunc (void);
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+ extern __attribute__((__visibility__("default"))) int exportedfunc (void);
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+ void dummyfunc (void) {}
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+ ]],
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+ [[]])],
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+ [gl_cv_cc_visibility=yes],
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+ [gl_cv_cc_visibility=no])
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+ CFLAGS="$gl_save_CFLAGS"])
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+ AC_MSG_RESULT([$gl_cv_cc_visibility])
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+ if test $gl_cv_cc_visibility = yes; then
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+ CFLAG_VISIBILITY="-fvisibility=hidden"
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+ HAVE_VISIBILITY=1
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+ fi
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+ fi
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+ AC_SUBST([CFLAG_VISIBILITY])
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+ AC_SUBST([HAVE_VISIBILITY])
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+ AC_DEFINE_UNQUOTED([HAVE_VISIBILITY], [$HAVE_VISIBILITY],
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+ [Define to 1 or 0, depending whether the compiler supports simple visibility declarations.])
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+])
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