diff options
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/curl-compilers.m4 | 112 | ||||
| -rw-r--r-- | m4/curl-confopts.m4 | 77 |
2 files changed, 185 insertions, 4 deletions
diff --git a/m4/curl-compilers.m4 b/m4/curl-compilers.m4 index c0f18c897..9b212e462 100644 --- a/m4/curl-compilers.m4 +++ b/m4/curl-compilers.m4 @@ -5,7 +5,7 @@ # | (__| |_| | _ <| |___ # \___|\___/|_| \_\_____| # -# Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al. +# Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al. # # This software is licensed as described in the file COPYING, which # you should have received as part of this distribution. The terms @@ -21,7 +21,7 @@ #*************************************************************************** # File version for 'aclocal' use. Keep it a single number. -# serial 58 +# serial 59 dnl CURL_CHECK_COMPILER @@ -1375,6 +1375,114 @@ AC_DEFUN([CURL_CHECK_COMPILER_STRUCT_MEMBER_SIZE], [ ]) +dnl CURL_CHECK_COMPILER_SYMBOL_HIDING +dnl ------------------------------------------------- +dnl Verify if compiler supports hiding library internal symbols, setting +dnl shell variable supports_symbol_hiding value as appropriate, as well as +dnl variables symbol_hiding_CFLAGS and symbol_hiding_EXTERN when supported. + +AC_DEFUN([CURL_CHECK_COMPILER_SYMBOL_HIDING], [ + AC_REQUIRE([CURL_CHECK_COMPILER])dnl + AC_BEFORE([$0],[CURL_CONFIGURE_SYMBOL_HIDING])dnl + AC_MSG_CHECKING([if compiler supports hiding library internal symbols]) + supports_symbol_hiding="no" + symbol_hiding_CFLAGS="" + symbol_hiding_EXTERN="" + tmp_CFLAGS="" + tmp_EXTERN="" + case "$compiler_id" in + CLANG) + dnl All versions of clang support -fvisibility= + tmp_EXTERN="__attribute__ ((visibility (\"default\")))" + tmp_CFLAGS="-fvisibility=hidden" + supports_symbol_hiding="yes" + ;; + GNU_C) + dnl Only gcc 3.4 or later + if test "$compiler_num" -ge "304"; then + if $CC --help --verbose 2>&1 | grep fvisibility= > /dev/null ; then + tmp_EXTERN="__attribute__ ((visibility (\"default\")))" + tmp_CFLAGS="-fvisibility=hidden" + supports_symbol_hiding="yes" + fi + fi + ;; + INTEL_UNIX_C) + dnl Only icc 9.0 or later + if test "$compiler_num" -ge "900"; then + if $CC --help --verbose 2>&1 | grep fvisibility= > /dev/null ; then + tmp_save_CFLAGS="$CFLAGS" + CFLAGS="$CFLAGS -fvisibility=hidden" + AC_LINK_IFELSE([ + AC_LANG_PROGRAM([[ +# include <stdio.h> + ]],[[ + printf("icc fvisibility bug test"); + ]]) + ],[ + tmp_EXTERN="__attribute__ ((visibility (\"default\")))" + tmp_CFLAGS="-fvisibility=hidden" + supports_symbol_hiding="yes" + ]) + CFLAGS="$tmp_save_CFLAGS" + fi + fi + ;; + SUNPRO_C) + if $CC 2>&1 | grep flags >/dev/null && $CC -flags | grep xldscope= >/dev/null ; then + tmp_EXTERN="__global" + tmp_CFLAGS="-xldscope=hidden" + supports_symbol_hiding="yes" + fi + ;; + esac + if test "$supports_symbol_hiding" = "yes"; then + tmp_save_CFLAGS="$CFLAGS" + CFLAGS="$tmp_save_CFLAGS $tmp_CFLAGS" + squeeze CFLAGS + AC_COMPILE_IFELSE([ + AC_LANG_PROGRAM([[ + $tmp_EXTERN char *dummy(char *buff); + char *dummy(char *buff) + { + if(buff) + return ++buff; + else + return buff; + } + ]],[[ + char b[16]; + char *r = dummy(&b[0]); + if(r) + return (int)*r; + ]]) + ],[ + supports_symbol_hiding="yes" + if test -f conftest.err; then + grep 'visibility' conftest.err >/dev/null + if test "$?" -eq "0"; then + supports_symbol_hiding="no" + fi + fi + ],[ + supports_symbol_hiding="no" + echo " " >&6 + sed 's/^/cc-src: /' conftest.$ac_ext >&6 + sed 's/^/cc-err: /' conftest.err >&6 + echo " " >&6 + ]) + CFLAGS="$tmp_save_CFLAGS" + fi + if test "$supports_symbol_hiding" = "yes"; then + AC_MSG_RESULT([yes]) + symbol_hiding_CFLAGS="$tmp_CFLAGS" + symbol_hiding_EXTERN="$tmp_EXTERN" + else + AC_MSG_RESULT([no]) + fi +]) + + dnl CURL_VAR_MATCH (VARNAME, VALUE) dnl ------------------------------------------------- dnl Verifies if shell variable VARNAME contains VALUE. diff --git a/m4/curl-confopts.m4 b/m4/curl-confopts.m4 index 9d4315626..f335b7a60 100644 --- a/m4/curl-confopts.m4 +++ b/m4/curl-confopts.m4 @@ -5,7 +5,7 @@ # | (__| |_| | _ <| |___ # \___|\___/|_| \_\_____| # -# Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al. +# Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al. # # This software is licensed as described in the file COPYING, which # you should have received as part of this distribution. The terms @@ -21,7 +21,7 @@ #*************************************************************************** # File version for 'aclocal' use. Keep it a single number. -# serial 16 +# serial 17 dnl CURL_CHECK_OPTION_THREADED_RESOLVER dnl ------------------------------------------------- @@ -258,6 +258,50 @@ AC_HELP_STRING([--disable-optimize],[Disable compiler optimizations]), ]) +dnl CURL_CHECK_OPTION_SYMBOL_HIDING +dnl ------------------------------------------------- +dnl Verify if configure has been invoked with option +dnl --enable-symbol-hiding or --disable-symbol-hiding, +dnl setting shell variable want_symbol_hiding value. + +AC_DEFUN([CURL_CHECK_OPTION_SYMBOL_HIDING], [ + AC_BEFORE([$0],[CURL_CHECK_COMPILER_SYMBOL_HIDING])dnl + AC_MSG_CHECKING([whether to enable hiding of library internal symbols]) + OPT_SYMBOL_HIDING="default" + AC_ARG_ENABLE(symbol-hiding, +AC_HELP_STRING([--enable-symbol-hiding],[Enable hiding of library internal symbols]) +AC_HELP_STRING([--disable-symbol-hiding],[Disable hiding of library internal symbols]), + OPT_SYMBOL_HIDING=$enableval) + AC_ARG_ENABLE(hidden-symbols, +AC_HELP_STRING([--enable-hidden-symbols],[To be deprecated, use --enable-symbol-hiding]) +AC_HELP_STRING([--disable-hidden-symbols],[To be deprecated, use --disable-symbol-hiding]), + OPT_SYMBOL_HIDING=$enableval) + case "$OPT_SYMBOL_HIDING" in + no) + dnl --disable-symbol-hiding option used. + dnl This is an indication to not attempt hiding of library internal + dnl symbols. Default symbol visibility will be used, which normally + dnl exposes all library internal symbols. + want_symbol_hiding="no" + AC_MSG_RESULT([no]) + ;; + default) + dnl configure's symbol-hiding option not specified. + dnl Handle this as if --enable-symbol-hiding option was given. + want_symbol_hiding="yes" + AC_MSG_RESULT([yes]) + ;; + *) + dnl --enable-symbol-hiding option used. + dnl This is an indication to attempt hiding of library internal + dnl symbols. This is only supported on some compilers/linkers. + want_symbol_hiding="yes" + AC_MSG_RESULT([yes]) + ;; + esac +]) + + dnl CURL_CHECK_OPTION_THREADS dnl ------------------------------------------------- dnl Verify if configure has been invoked with option @@ -411,6 +455,35 @@ AC_DEFUN([CURL_CHECK_NONBLOCKING_SOCKET], [ ]) +dnl CURL_CONFIGURE_SYMBOL_HIDING +dnl ------------------------------------------------- +dnl Depending on --enable-symbol-hiding or --disable-symbol-hiding +dnl configure option, and compiler capability to actually honor such +dnl option, this will modify compiler flags as appropriate and also +dnl provide needed definitions for configuration and Makefile.am files. +dnl This macro should not be used until all compilation tests have +dnl been done to prevent interferences on other tests. + +AC_DEFUN([CURL_CONFIGURE_SYMBOL_HIDING], [ + AC_MSG_CHECKING([whether hiding of library internal symbols will actually happen]) + CFLAG_SYMBOL_HIDING="" + doing_symbol_hiding="no" + if test x"$ac_cv_native_windows" != "xyes" && + test "$want_symbol_hiding" = "yes" && + test "$supports_symbol_hiding" = "yes"; then + doing_symbol_hiding="yes" + CFLAG_SYMBOL_HIDING="$symbol_hiding_CFLAGS" + AC_DEFINE_UNQUOTED(CURL_EXTERN_SYMBOL, $symbol_hiding_EXTERN, + [Definition to make a library symbol externally visible.]) + AC_MSG_RESULT([yes]) + else + AC_MSG_RESULT([no]) + fi + AM_CONDITIONAL(DOING_SYMBOL_HIDING, test x$doing_symbol_hiding = xyes) + AC_SUBST(CFLAG_SYMBOL_HIDING) +]) + + dnl CURL_CHECK_LIB_ARES dnl ------------------------------------------------- dnl When c-ares library support has been requested, |