diff options
Diffstat (limited to 'gl/m4/visibility.m4')
| -rw-r--r-- | gl/m4/visibility.m4 | 79 |
1 files changed, 42 insertions, 37 deletions
diff --git a/gl/m4/visibility.m4 b/gl/m4/visibility.m4 index 6cbd7e5..d161bd7 100644 --- a/gl/m4/visibility.m4 +++ b/gl/m4/visibility.m4 | |||
| @@ -1,5 +1,5 @@ | |||
| 1 | # visibility.m4 serial 5 (gettext-0.18.2) | 1 | # visibility.m4 serial 8 |
| 2 | dnl Copyright (C) 2005, 2008, 2010-2013 Free Software Foundation, Inc. | 2 | dnl Copyright (C) 2005, 2008, 2010-2021 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. |
| @@ -29,42 +29,47 @@ AC_DEFUN([gl_VISIBILITY], | |||
| 29 | dnl First, check whether -Werror can be added to the command line, or | 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 | 30 | dnl whether it leads to an error because of some other option that the |
| 31 | dnl user has put into $CC $CFLAGS $CPPFLAGS. | 31 | dnl user has put into $CC $CFLAGS $CPPFLAGS. |
| 32 | AC_MSG_CHECKING([whether the -Werror option is usable]) | 32 | AC_CACHE_CHECK([whether the -Werror option is usable], |
| 33 | AC_CACHE_VAL([gl_cv_cc_vis_werror], [ | 33 | [gl_cv_cc_vis_werror], |
| 34 | gl_save_CFLAGS="$CFLAGS" | 34 | [gl_save_CFLAGS="$CFLAGS" |
| 35 | CFLAGS="$CFLAGS -Werror" | 35 | CFLAGS="$CFLAGS -Werror" |
| 36 | AC_COMPILE_IFELSE( | 36 | AC_COMPILE_IFELSE( |
| 37 | [AC_LANG_PROGRAM([[]], [[]])], | 37 | [AC_LANG_PROGRAM([[]], [[]])], |
| 38 | [gl_cv_cc_vis_werror=yes], | 38 | [gl_cv_cc_vis_werror=yes], |
| 39 | [gl_cv_cc_vis_werror=no]) | 39 | [gl_cv_cc_vis_werror=no]) |
| 40 | CFLAGS="$gl_save_CFLAGS"]) | 40 | CFLAGS="$gl_save_CFLAGS" |
| 41 | AC_MSG_RESULT([$gl_cv_cc_vis_werror]) | 41 | ]) |
| 42 | dnl Now check whether visibility declarations are supported. | 42 | dnl Now check whether visibility declarations are supported. |
| 43 | AC_MSG_CHECKING([for simple visibility declarations]) | 43 | AC_CACHE_CHECK([for simple visibility declarations], |
| 44 | AC_CACHE_VAL([gl_cv_cc_visibility], [ | 44 | [gl_cv_cc_visibility], |
| 45 | gl_save_CFLAGS="$CFLAGS" | 45 | [gl_save_CFLAGS="$CFLAGS" |
| 46 | CFLAGS="$CFLAGS -fvisibility=hidden" | 46 | CFLAGS="$CFLAGS -fvisibility=hidden" |
| 47 | dnl We use the option -Werror and a function dummyfunc, because on some | 47 | dnl We use the option -Werror and a function dummyfunc, because on some |
| 48 | dnl platforms (Cygwin 1.7) the use of -fvisibility triggers a warning | 48 | dnl platforms (Cygwin 1.7) the use of -fvisibility triggers a warning |
| 49 | dnl "visibility attribute not supported in this configuration; ignored" | 49 | dnl "visibility attribute not supported in this configuration; ignored" |
| 50 | dnl at the first function definition in every compilation unit, and we | 50 | dnl at the first function definition in every compilation unit, and we |
| 51 | dnl don't want to use the option in this case. | 51 | dnl don't want to use the option in this case. |
| 52 | if test $gl_cv_cc_vis_werror = yes; then | 52 | if test $gl_cv_cc_vis_werror = yes; then |
| 53 | CFLAGS="$CFLAGS -Werror" | 53 | CFLAGS="$CFLAGS -Werror" |
| 54 | fi | 54 | fi |
| 55 | AC_COMPILE_IFELSE( | 55 | AC_COMPILE_IFELSE( |
| 56 | [AC_LANG_PROGRAM( | 56 | [AC_LANG_PROGRAM( |
| 57 | [[extern __attribute__((__visibility__("hidden"))) int hiddenvar; | 57 | [[extern __attribute__((__visibility__("hidden"))) int hiddenvar; |
| 58 | extern __attribute__((__visibility__("default"))) int exportedvar; | 58 | extern __attribute__((__visibility__("default"))) int exportedvar; |
| 59 | extern __attribute__((__visibility__("hidden"))) int hiddenfunc (void); | 59 | extern __attribute__((__visibility__("hidden"))) int hiddenfunc (void); |
| 60 | extern __attribute__((__visibility__("default"))) int exportedfunc (void); | 60 | extern __attribute__((__visibility__("default"))) int exportedfunc (void); |
| 61 | void dummyfunc (void) {} | 61 | void dummyfunc (void); |
| 62 | ]], | 62 | int hiddenvar; |
| 63 | [[]])], | 63 | int exportedvar; |
| 64 | [gl_cv_cc_visibility=yes], | 64 | int hiddenfunc (void) { return 51; } |
| 65 | [gl_cv_cc_visibility=no]) | 65 | int exportedfunc (void) { return 1225736919; } |
| 66 | CFLAGS="$gl_save_CFLAGS"]) | 66 | void dummyfunc (void) {} |
| 67 | AC_MSG_RESULT([$gl_cv_cc_visibility]) | 67 | ]], |
| 68 | [[]])], | ||
| 69 | [gl_cv_cc_visibility=yes], | ||
| 70 | [gl_cv_cc_visibility=no]) | ||
| 71 | CFLAGS="$gl_save_CFLAGS" | ||
| 72 | ]) | ||
| 68 | if test $gl_cv_cc_visibility = yes; then | 73 | if test $gl_cv_cc_visibility = yes; then |
| 69 | CFLAG_VISIBILITY="-fvisibility=hidden" | 74 | CFLAG_VISIBILITY="-fvisibility=hidden" |
| 70 | HAVE_VISIBILITY=1 | 75 | HAVE_VISIBILITY=1 |