pcre/pcre-8.32-visibility.patch

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From 1484e50a2818b2f207688765cef6cd2f5cc71520 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cristian=20Rodr=C3=ADguez?= <crrodriguez@opensuse.org>
Date: Mon, 22 Oct 2012 22:38:34 +0200
Subject: [PATCH] build: Use GCC visibility to hide private symbols
http://bugs.exim.org/show_bug.cgi?id=1173
--
--- /dev/null
+++ pcre-8.32/m4/visibility.m4
@@ -0,0 +1,89 @@
+# visibility.m4 serial 4 (gettext-0.18.2)
+dnl Copyright (C) 2005, 2008, 2010-2011 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.
+
+dnl Modified to fit with PCRE build environment by Cristian Rodríguez.
+
+AC_DEFUN([PCRE_VISIBILITY],
+[
+ AC_REQUIRE([AC_PROG_CC])
+ CFLAG_VISIBILITY=
+ CXXFLAG_INLINES_HIDDEN=
+ 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 $pcre_cv_cc_vis_werror = yes; then
+ CFLAGS="$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) {}
+ ]],
+ [[]])],
+ [pcre_cv_cc_visibility=yes],
+ [pcre_cv_cc_visibility=no])
+ CFLAGS="$gl_save_CFLAGS"])
+ AC_MSG_RESULT([$pcre_cv_cc_visibility])
+ if test $pcre_cv_cc_visibility = yes; then
+ VISIBILITY_CFLAGS="-fvisibility=hidden"
+ VISIBILITY_CXXFLAGS="-fvisibility=hidden -fvisibility-inlines-hidden"
+ HAVE_VISIBILITY=1
+ AC_DEFINE(PCRE_EXP_DECL, [extern __attribute__ ((visibility ("default")))], [to make a symbol visible])
+ AC_DEFINE(PCRE_EXP_DEFN, [__attribute__ ((visibility ("default")))], [to make a symbol visible])
+ AC_DEFINE(PCRE_EXP_DATA_DEFN, [__attribute__ ((visibility ("default")))], [to make a symbol visible])
+ AC_DEFINE(PCREPOSIX_EXP_DECL, [extern __attribute__ ((visibility ("default")))], [to make a symbol visible])
+ AC_DEFINE(PCREPOSIX_EXP_DEFN, [extern __attribute__ ((visibility ("default")))], [to make a symbol visible])
+ AC_DEFINE(PCRECPP_EXP_DECL, [extern __attribute__ ((visibility ("default")))], [to make a symbol visible])
+ AC_DEFINE(PCRECPP_EXP_DEFN, [__attribute__ ((visibility ("default")))], [to make a symbol visible])
+ fi
+ fi
+ AC_SUBST([VISIBILITY_CFLAGS])
+ AC_SUBST([VISIBILITY_CXXFLAGS])
+ AC_SUBST([HAVE_VISIBILITY])
+ AC_DEFINE_UNQUOTED([HAVE_VISIBILITY], [$HAVE_VISIBILITY],
+ [Define to 1 or 0, depending whether the compiler supports simple visibility declarations.])
+])
--- pcre-8.32.orig/configure.ac
+++ pcre-8.32/configure.ac
@@ -46,7 +46,9 @@ AC_CONFIG_MACRO_DIR([m4])
remember_set_CFLAGS="$CFLAGS"
remember_set_CXXFLAGS="$CXXFLAGS"
-AC_PROG_CC
+AC_PROG_CC_STDC
+AC_USE_SYSTEM_EXTENSIONS
+AC_SYS_LARGEFILE
AC_PROG_CXX
AM_PROG_CC_C_O