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| author | Arnold D. Robbins <arnold@skeeve.com> | 2012-04-27 10:10:07 +0300 |
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| committer | Arnold D. Robbins <arnold@skeeve.com> | 2012-04-27 10:10:07 +0300 |
| commit | fa620d22a63f26f8098d7b4c4b835ad27c1b13a7 (patch) | |
| tree | 75dc9ee66c3cac1c6a7796d404aee0f0836a106f /m4/visibility.m4 | |
| parent | ed69ad69e9e4603fef71510cfef13d2a8b153ae0 (diff) | |
| parent | 2ee1a96b398f3bd183a84509464770153a8890d4 (diff) | |
| download | egawk-fa620d22a63f26f8098d7b4c4b835ad27c1b13a7.tar.gz egawk-fa620d22a63f26f8098d7b4c4b835ad27c1b13a7.tar.bz2 egawk-fa620d22a63f26f8098d7b4c4b835ad27c1b13a7.zip | |
Merge branch 'gawk-4.0-stable' (latest infrastructure).
Diffstat (limited to 'm4/visibility.m4')
| -rw-r--r-- | m4/visibility.m4 | 34 |
1 files changed, 28 insertions, 6 deletions
diff --git a/m4/visibility.m4 b/m4/visibility.m4 index 2ff6330a..077c4765 100644 --- a/m4/visibility.m4 +++ b/m4/visibility.m4 @@ -1,5 +1,5 @@ -# visibility.m4 serial 1 (gettext-0.15) -dnl Copyright (C) 2005 Free Software Foundation, Inc. +# visibility.m4 serial 3 (gettext-0.18) +dnl Copyright (C) 2005, 2008-2010 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. @@ -26,18 +26,40 @@ AC_DEFUN([gl_VISIBILITY], 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="$CFLAGS -Werror" + AC_TRY_COMPILE([], [], + [gl_cv_cc_vis_werror=yes], + [gl_cv_cc_vis_werror=no]) + CFLAGS="$gl_save_CFLAGS"]) + AC_MSG_RESULT([$gl_cv_cc_vis_werror]) + dnl Now check whether visibility declarations are supported. AC_MSG_CHECKING([for simple visibility declarations]) - AC_CACHE_VAL(gl_cv_cc_visibility, [ + AC_CACHE_VAL([gl_cv_cc_visibility], [ gl_save_CFLAGS="$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_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);], + extern __attribute__((__visibility__("default"))) int exportedfunc (void); + void dummyfunc (void) {}], [], - gl_cv_cc_visibility=yes, - gl_cv_cc_visibility=no) + [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 |