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| author | Arnold D. Robbins <arnold@skeeve.com> | 2012-04-27 09:52:14 +0300 |
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| committer | Arnold D. Robbins <arnold@skeeve.com> | 2012-04-27 09:52:14 +0300 |
| commit | 2ee1a96b398f3bd183a84509464770153a8890d4 (patch) | |
| tree | a723fd480c88952af0e1270df3e61c0a8180e7a3 /m4/visibility.m4 | |
| parent | d7dfcfc5bb3fa6aa01d96a079d4a0bc89cf3f5b0 (diff) | |
| download | egawk-2ee1a96b398f3bd183a84509464770153a8890d4.tar.gz egawk-2ee1a96b398f3bd183a84509464770153a8890d4.tar.bz2 egawk-2ee1a96b398f3bd183a84509464770153a8890d4.zip | |
Upgrade infrastructure to autoconf 2.69, automake 1.12.
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 |