Mercurial > gnulib
view m4/visibility.m4 @ 40163:b89f4c441767
Avoid build errors due to wrong references between modules.
* lib/uninorm/canonical-decomposition.c: Include
"uninorm/decomposition-table.h", not "decomposition-table.h".
* lib/uninorm/decomposition.c: Likewise.
* lib/uninorm/u8-normalize.c: Include "uninorm/decompose-internal.h",
not "decompose-internal.h".
* lib/uninorm/u16-normalize.c: Likewise.
* lib/uninorm/u32-normalize.c: Likewise.
* lib/uninorm/uninorm-filter.c: Likewise.
* lib/uninorm/nfkc.c: Likewise.
* lib/uninorm/nfkd.c: Likewise.
* lib/unicase/u8-casemap.c: Include "unicase/caseprop.h", not
"caseprop.h".
* lib/unicase/u8-ct-totitle.c: Likewise.
* lib/unicase/u8-prefix-context.c: Likewise.
* lib/unicase/u8-suffix-context.c: Likewise.
* lib/unicase/u16-casemap.c: Likewise.
* lib/unicase/u16-ct-totitle.c: Likewise.
* lib/unicase/u16-prefix-context.c: Likewise.
* lib/unicase/u16-suffix-context.c: Likewise.
* lib/unicase/u32-casemap.c: Likewise.
* lib/unicase/u32-ct-totitle.c: Likewise.
* lib/unicase/u32-prefix-context.c: Likewise.
* lib/unicase/u32-suffix-context.c: Likewise.
* lib/unicase/u8-tolower.c: Include "unicase/unicasemap.h", not
"unicasemap.h".
* lib/unicase/u8-toupper.c: Likewise.
* lib/unicase/u8-ct-tolower.c: Likewise.
* lib/unicase/u8-ct-toupper.c: Likewise.
* lib/unicase/u16-tolower.c: Likewise.
* lib/unicase/u16-toupper.c: Likewise.
* lib/unicase/u16-ct-tolower.c: Likewise.
* lib/unicase/u16-ct-toupper.c: Likewise.
* lib/unicase/u32-tolower.c: Likewise.
* lib/unicase/u32-toupper.c: Likewise.
* lib/unicase/u32-ct-tolower.c: Likewise.
* lib/unicase/u32-ct-toupper.c: Likewise.
* lib/unicase/u8-ct-casefold.c: Include "unicase/unicasemap.h", not
"unicasemap.h", and "unicase/casefold.h", not "casefold.h".
* lib/unicase/u16-ct-casefold.c: Likewise.
* lib/unicase/u32-ct-casefold.c: Likewise.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Mon, 28 Jan 2019 01:20:11 +0100 |
parents | b06060465f09 |
children |
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# visibility.m4 serial 6 dnl Copyright (C) 2005, 2008, 2010-2019 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 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 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 $CPPFLAGS. AC_CACHE_CHECK([whether the -Werror option is usable], [gl_cv_cc_vis_werror], [gl_save_CFLAGS="$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" ]) dnl Now check whether visibility declarations are supported. AC_CACHE_CHECK([for simple visibility declarations], [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" ]) 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.]) ])