diff options
Diffstat (limited to 'm4/visibility.m4')
-rw-r--r-- | m4/visibility.m4 | 49 |
1 files changed, 37 insertions, 12 deletions
diff --git a/m4/visibility.m4 b/m4/visibility.m4 index 2ff6330aa..552e39772 100644 --- a/m4/visibility.m4 +++ b/m4/visibility.m4 | |||
@@ -1,5 +1,5 @@ | |||
1 | # visibility.m4 serial 1 (gettext-0.15) | 1 | # visibility.m4 serial 5 (gettext-0.18.2) |
2 | dnl Copyright (C) 2005 Free Software Foundation, Inc. | 2 | dnl Copyright (C) 2005, 2008, 2010-2014 Free Software Foundation, Inc. |
3 | dnl This file is free software; the Free Software Foundation | 3 | dnl This file is free software; the Free Software Foundation |
4 | dnl gives unlimited permission to copy and/or distribute it, | 4 | dnl gives unlimited permission to copy and/or distribute it, |
5 | dnl with or without modifications, as long as this notice is preserved. | 5 | dnl with or without modifications, as long as this notice is preserved. |
@@ -12,7 +12,7 @@ dnl __attribute__((__visibility__("hidden"))) and | |||
12 | dnl __attribute__((__visibility__("default"))). | 12 | dnl __attribute__((__visibility__("default"))). |
13 | dnl Does *not* test for __visibility__("protected") - which has tricky | 13 | dnl Does *not* test for __visibility__("protected") - which has tricky |
14 | dnl semantics (see the 'vismain' test in glibc) and does not exist e.g. on | 14 | dnl semantics (see the 'vismain' test in glibc) and does not exist e.g. on |
15 | dnl MacOS X. | 15 | dnl Mac OS X. |
16 | dnl Does *not* test for __visibility__("internal") - which has processor | 16 | dnl Does *not* test for __visibility__("internal") - which has processor |
17 | dnl dependent semantics. | 17 | dnl dependent semantics. |
18 | dnl Does *not* test for #pragma GCC visibility push(hidden) - which is | 18 | dnl Does *not* test for #pragma GCC visibility push(hidden) - which is |
@@ -26,18 +26,43 @@ AC_DEFUN([gl_VISIBILITY], | |||
26 | CFLAG_VISIBILITY= | 26 | CFLAG_VISIBILITY= |
27 | HAVE_VISIBILITY=0 | 27 | HAVE_VISIBILITY=0 |
28 | if test -n "$GCC"; then | 28 | if test -n "$GCC"; then |
29 | dnl First, check whether -Werror can be added to the command line, or | ||
30 | dnl whether it leads to an error because of some other option that the | ||
31 | dnl user has put into $CC $CFLAGS $CPPFLAGS. | ||
32 | AC_MSG_CHECKING([whether the -Werror option is usable]) | ||
33 | AC_CACHE_VAL([gl_cv_cc_vis_werror], [ | ||
34 | gl_save_CFLAGS="$CFLAGS" | ||
35 | CFLAGS="$CFLAGS -Werror" | ||
36 | AC_COMPILE_IFELSE( | ||
37 | [AC_LANG_PROGRAM([[]], [[]])], | ||
38 | [gl_cv_cc_vis_werror=yes], | ||
39 | [gl_cv_cc_vis_werror=no]) | ||
40 | CFLAGS="$gl_save_CFLAGS"]) | ||
41 | AC_MSG_RESULT([$gl_cv_cc_vis_werror]) | ||
42 | dnl Now check whether visibility declarations are supported. | ||
29 | AC_MSG_CHECKING([for simple visibility declarations]) | 43 | AC_MSG_CHECKING([for simple visibility declarations]) |
30 | AC_CACHE_VAL(gl_cv_cc_visibility, [ | 44 | AC_CACHE_VAL([gl_cv_cc_visibility], [ |
31 | gl_save_CFLAGS="$CFLAGS" | 45 | gl_save_CFLAGS="$CFLAGS" |
32 | CFLAGS="$CFLAGS -fvisibility=hidden" | 46 | CFLAGS="$CFLAGS -fvisibility=hidden" |
33 | AC_TRY_COMPILE( | 47 | dnl We use the option -Werror and a function dummyfunc, because on some |
34 | [extern __attribute__((__visibility__("hidden"))) int hiddenvar; | 48 | dnl platforms (Cygwin 1.7) the use of -fvisibility triggers a warning |
35 | extern __attribute__((__visibility__("default"))) int exportedvar; | 49 | dnl "visibility attribute not supported in this configuration; ignored" |
36 | extern __attribute__((__visibility__("hidden"))) int hiddenfunc (void); | 50 | dnl at the first function definition in every compilation unit, and we |
37 | extern __attribute__((__visibility__("default"))) int exportedfunc (void);], | 51 | dnl don't want to use the option in this case. |
38 | [], | 52 | if test $gl_cv_cc_vis_werror = yes; then |
39 | gl_cv_cc_visibility=yes, | 53 | CFLAGS="$CFLAGS -Werror" |
40 | gl_cv_cc_visibility=no) | 54 | fi |
55 | AC_COMPILE_IFELSE( | ||
56 | [AC_LANG_PROGRAM( | ||
57 | [[extern __attribute__((__visibility__("hidden"))) int hiddenvar; | ||
58 | extern __attribute__((__visibility__("default"))) int exportedvar; | ||
59 | extern __attribute__((__visibility__("hidden"))) int hiddenfunc (void); | ||
60 | extern __attribute__((__visibility__("default"))) int exportedfunc (void); | ||
61 | void dummyfunc (void) {} | ||
62 | ]], | ||
63 | [[]])], | ||
64 | [gl_cv_cc_visibility=yes], | ||
65 | [gl_cv_cc_visibility=no]) | ||
41 | CFLAGS="$gl_save_CFLAGS"]) | 66 | CFLAGS="$gl_save_CFLAGS"]) |
42 | AC_MSG_RESULT([$gl_cv_cc_visibility]) | 67 | AC_MSG_RESULT([$gl_cv_cc_visibility]) |
43 | if test $gl_cv_cc_visibility = yes; then | 68 | if test $gl_cv_cc_visibility = yes; then |