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author | Reuben Thomas <rrt@sc3d.org> | 2013-12-16 02:33:24 +0000 |
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committer | Reuben Thomas <rrt@sc3d.org> | 2013-12-16 02:33:24 +0000 |
commit | bdc4e6f675930e28bfcb373225ef8cb4a9e47340 (patch) | |
tree | 1436629f308946bbc76624c47443bdaa1a243c0f /m4/visibility.m4 | |
parent | bce3b23795023b2493226bb88c9fea1e2ee5898b (diff) | |
download | plptools-bdc4e6f675930e28bfcb373225ef8cb4a9e47340.tar.gz plptools-bdc4e6f675930e28bfcb373225ef8cb4a9e47340.tar.bz2 plptools-bdc4e6f675930e28bfcb373225ef8cb4a9e47340.zip |
Make reasonably recent autotools happy; remove gettext files
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 2ff6330..6cbd7e5 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 5 (gettext-0.18.2) +dnl Copyright (C) 2005, 2008, 2010-2013 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. @@ -12,7 +12,7 @@ dnl __attribute__((__visibility__("hidden"))) and dnl __attribute__((__visibility__("default"))). dnl Does *not* test for __visibility__("protected") - which has tricky dnl semantics (see the 'vismain' test in glibc) and does not exist e.g. on -dnl MacOS X. +dnl Mac OS X. dnl Does *not* test for __visibility__("internal") - which has processor dnl dependent semantics. dnl Does *not* test for #pragma GCC visibility push(hidden) - which is @@ -26,18 +26,43 @@ 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="$CFLAGS -Werror" + AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM([[]], [[]])], + [gl_cv_cc_vis_werror=yes], + [gl_cv_cc_vis_werror=no]) + CFLAGS="$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" - 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);], - [], - gl_cv_cc_visibility=yes, - gl_cv_cc_visibility=no) + 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_COMPILE_IFELSE( + [AC_LANG_PROGRAM( + [[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); + void dummyfunc (void) {} + ]], + [[]])], + [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 |