From d9a9e18205f4da1486a70dbd5690b8fdc593cb10 Mon Sep 17 00:00:00 2001 From: Andy Wingo Date: Tue, 26 May 2009 17:45:48 +0200 Subject: [PATCH] gnulib-tool --import lib-symbol-visibility --- lib/Makefile.am | 12 ++++++++++- m4/gnulib-cache.m4 | 3 ++- m4/gnulib-comp.m4 | 2 ++ m4/include_next.m4 | 32 +++++++++++++++++++++------- m4/visibility.m4 | 52 ++++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 91 insertions(+), 10 deletions(-) create mode 100644 m4/visibility.m4 diff --git a/lib/Makefile.am b/lib/Makefile.am index 78693ea11..8f431c2b1 100644 --- a/lib/Makefile.am +++ b/lib/Makefile.am @@ -9,7 +9,7 @@ # the same distribution terms as the rest of that program. # # Generated by gnulib-tool. -# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --lgpl --libtool --macro-prefix=gl --no-vc-files alloca-opt autobuild count-one-bits extensions flock fpieee full-read full-write putenv stdlib strcase strftime +# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --lgpl --libtool --macro-prefix=gl --no-vc-files alloca-opt autobuild count-one-bits extensions flock fpieee full-read full-write lib-symbol-visibility putenv stdlib strcase strftime AUTOMAKE_OPTIONS = 1.5 gnits @@ -143,6 +143,16 @@ libgnu_la_SOURCES += full-write.h full-write.c ## end gnulib module full-write +## begin gnulib module lib-symbol-visibility + +# The value of $(CFLAG_VISIBILITY) needs to be added to the CFLAGS for the +# compilation of all sources that make up the library. This line here does it +# only for the gnulib part of it. The developer is responsible for adding +# $(CFLAG_VISIBILITY) to the Makefile.ams of the other portions of the library. +AM_CFLAGS += $(CFLAG_VISIBILITY) + +## end gnulib module lib-symbol-visibility + ## begin gnulib module link-warning LINK_WARNING_H=$(top_srcdir)/build-aux/link-warning.h diff --git a/m4/gnulib-cache.m4 b/m4/gnulib-cache.m4 index 1122aa58d..fd6c4fe91 100644 --- a/m4/gnulib-cache.m4 +++ b/m4/gnulib-cache.m4 @@ -15,7 +15,7 @@ # Specification in the form of a command-line invocation: -# gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --lgpl --libtool --macro-prefix=gl --no-vc-files alloca-opt autobuild count-one-bits extensions flock fpieee full-read full-write putenv stdlib strcase strftime +# gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --lgpl --libtool --macro-prefix=gl --no-vc-files alloca-opt autobuild count-one-bits extensions flock fpieee full-read full-write lib-symbol-visibility putenv stdlib strcase strftime # Specification in the form of a few gnulib-tool.m4 macro invocations: gl_LOCAL_DIR([]) @@ -28,6 +28,7 @@ gl_MODULES([ fpieee full-read full-write + lib-symbol-visibility putenv stdlib strcase diff --git a/m4/gnulib-comp.m4 b/m4/gnulib-comp.m4 index 186f30f7a..77100fa1b 100644 --- a/m4/gnulib-comp.m4 +++ b/m4/gnulib-comp.m4 @@ -48,6 +48,7 @@ AC_DEFUN([gl_INIT], gl_FUNC_FLOCK gl_HEADER_SYS_FILE_MODULE_INDICATOR([flock]) gl_INLINE + gl_VISIBILITY gl_LOCALCHARSET LOCALCHARSET_TESTS_ENVIRONMENT="CHARSETALIASDIR=\"\$(top_builddir)/$gl_source_base\"" AC_SUBST([LOCALCHARSET_TESTS_ENVIRONMENT]) @@ -283,6 +284,7 @@ AC_DEFUN([gl_FILE_LIST], [ m4/time_r.m4 m4/tm_gmtoff.m4 m4/unistd_h.m4 + m4/visibility.m4 m4/wchar.m4 m4/wint_t.m4 m4/write.m4 diff --git a/m4/include_next.m4 b/m4/include_next.m4 index d6101fe32..5e22ded93 100644 --- a/m4/include_next.m4 +++ b/m4/include_next.m4 @@ -1,4 +1,4 @@ -# include_next.m4 serial 12 +# include_next.m4 serial 14 dnl Copyright (C) 2006-2009 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, @@ -104,8 +104,14 @@ EOF # For each arg foo.h, if #include_next works, define NEXT_FOO_H to be # ''; otherwise define it to be # '"///usr/include/foo.h"', or whatever other absolute file name is suitable. +# Also, if #include_next works as first preprocessing directive in a file, +# define NEXT_AS_FIRST_DIRECTIVE_FOO_H to be ''; otherwise define it to +# be +# '"///usr/include/foo.h"', or whatever other absolute file name is suitable. # That way, a header file with the following line: # #@INCLUDE_NEXT@ @NEXT_FOO_H@ +# or +# #@INCLUDE_NEXT_AS_FIRST_DIRECTIVE@ @NEXT_AS_FIRST_DIRECTIVE_FOO_H@ # behaves (after sed substitution) as if it contained # #include_next # even if the compiler does not support include_next. @@ -123,15 +129,15 @@ AC_DEFUN([gl_CHECK_NEXT_HEADERS], m4_foreach_w([gl_HEADER_NAME], [$1], [AS_VAR_PUSHDEF([gl_next_header], - [gl_cv_next_]m4_quote(m4_defn([gl_HEADER_NAME]))) + [gl_cv_next_]m4_defn([gl_HEADER_NAME])) if test $gl_cv_have_include_next = yes; then AS_VAR_SET([gl_next_header], ['<'gl_HEADER_NAME'>']) else AC_CACHE_CHECK( - [absolute name of <]m4_quote(m4_defn([gl_HEADER_NAME]))[>], - m4_quote(m4_defn([gl_next_header])), + [absolute name of <]m4_defn([gl_HEADER_NAME])[>], + m4_defn([gl_next_header]), [AS_VAR_PUSHDEF([gl_header_exists], - [ac_cv_header_]m4_quote(m4_defn([gl_HEADER_NAME]))) + [ac_cv_header_]m4_defn([gl_HEADER_NAME])) if test AS_VAR_GET(gl_header_exists) = yes; then AC_LANG_CONFTEST( [AC_LANG_SOURCE( @@ -153,8 +159,8 @@ AC_DEFUN([gl_CHECK_NEXT_HEADERS], dnl so use subshell. AS_VAR_SET([gl_next_header], ['"'`(eval "$gl_absname_cpp conftest.$ac_ext") 2>&AS_MESSAGE_LOG_FD | - sed -n '\#/]m4_quote(m4_defn([gl_HEADER_NAME]))[#{ - s#.*"\(.*/]m4_quote(m4_defn([gl_HEADER_NAME]))[\)".*#\1# + sed -n '\#/]m4_defn([gl_HEADER_NAME])[#{ + s#.*"\(.*/]m4_defn([gl_HEADER_NAME])[\)".*#\1# s#^/[^/]#//&# p q @@ -165,7 +171,17 @@ AC_DEFUN([gl_CHECK_NEXT_HEADERS], AS_VAR_POPDEF([gl_header_exists])]) fi AC_SUBST( - AS_TR_CPP([NEXT_]m4_quote(m4_defn([gl_HEADER_NAME]))), + AS_TR_CPP([NEXT_]m4_defn([gl_HEADER_NAME])), [AS_VAR_GET([gl_next_header])]) + if test $gl_cv_have_include_next = yes || test $gl_cv_have_include_next = buggy; then + # INCLUDE_NEXT_AS_FIRST_DIRECTIVE='include_next' + gl_next_as_first_directive='<'gl_HEADER_NAME'>' + else + # INCLUDE_NEXT_AS_FIRST_DIRECTIVE='include' + gl_next_as_first_directive=AS_VAR_GET([gl_next_header]) + fi + AC_SUBST( + AS_TR_CPP([NEXT_AS_FIRST_DIRECTIVE_]m4_defn([gl_HEADER_NAME])), + [$gl_next_as_first_directive]) AS_VAR_POPDEF([gl_next_header])]) ]) diff --git a/m4/visibility.m4 b/m4/visibility.m4 new file mode 100644 index 000000000..70bca5643 --- /dev/null +++ b/m4/visibility.m4 @@ -0,0 +1,52 @@ +# visibility.m4 serial 2 (gettext-0.18) +dnl Copyright (C) 2005, 2008 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 "$GCC"; then + AC_MSG_CHECKING([for simple visibility declarations]) + AC_CACHE_VAL([gl_cv_cc_visibility], [ + gl_save_CFLAGS="$CFLAGS" + CFLAGS="$CFLAGS -fvisibility=hidden" + AC_TRY_COMPILE( + [extern __attribute__((__visibility__("hidden"))) int hiddenvar; + extern __attribute__((__visibility__("default"))) int exportedvar; + extern __attribute__((__visibility__("hidden"))) int hiddenfunc (void); + extern __attribute__((__visibility__("default"))) int exportedfunc (void);], + [], + [gl_cv_cc_visibility=yes], + [gl_cv_cc_visibility=no]) + CFLAGS="$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.]) +])