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build adjustments: CURL_HIDDEN_SYMBOLS no longer defined in config files

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configure script now provides conditional definitions for Makefile.am
that result in CURL_HIDDEN_SYMBOLS being defined by resulting makefiles
when appropriate.

Additionally, configure script option for symbol hiding control is now
named --enable-symbol-hiding --disable-symbol-hiding. While still valid,
old option name --enable-hidden-symbols --disable-hidden-symbols will
be deprecated in some future release.
This commit is contained in:
Yang Tse
2012-04-11 19:33:54 +02:00
parent a144bb8b76
commit 9e24b9c7af
9 changed files with 222 additions and 66 deletions
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112
m4/curl-compilers.m4
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@@ -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.