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Diffstat (limited to 'm4/visibility.m4')
| -rw-r--r-- | m4/visibility.m4 | 77 |
1 files changed, 0 insertions, 77 deletions
diff --git a/m4/visibility.m4 b/m4/visibility.m4 deleted file mode 100644 index 7b24d39..0000000 --- a/m4/visibility.m4 +++ /dev/null @@ -1,77 +0,0 @@ -# visibility.m4 serial 4 (gettext-0.18.2) -dnl Copyright (C) 2005, 2008, 2010-2012 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. - -dnl From Bruno Haible. - -dnl Tests whether the compiler supports the command-line option -dnl -fvisibility=hidden and the function and variable attributes -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 Does *not* test for __visibility__("internal") - which has processor -dnl dependent semantics. -dnl Does *not* test for #pragma GCC visibility push(hidden) - which is -dnl "really only recommended for legacy code". -dnl Set the variable CFLAG_VISIBILITY. -dnl Defines and sets the variable HAVE_VISIBILITY. - -AC_DEFUN([gl_VISIBILITY], -[ - AC_REQUIRE([AC_PROG_CC]) - 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([$gl_cv_cc_vis_werror]) - dnl Now check whether visibility declarations are supported. - AC_MSG_CHECKING([for simple visibility declarations]) - AC_CACHE_VAL([gl_cv_cc_visibility], [ - gl_save_CFLAGS="$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_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 $gl_cv_cc_visibility = yes; then - CFLAG_VISIBILITY="-fvisibility=hidden" - HAVE_VISIBILITY=1 - fi - fi - AC_SUBST([CFLAG_VISIBILITY]) - AC_SUBST([HAVE_VISIBILITY]) - AC_DEFINE_UNQUOTED([HAVE_VISIBILITY], [$HAVE_VISIBILITY], - [Define to 1 or 0, depending whether the compiler supports simple visibility declarations.]) -]) |