[PATCH 1/3] build-sys: Use ax_check_flag macros from autoconf archive

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Those macros cover almost all functionality of attributes.m4 that was
used, so that file can be removed.
The CC_NOUNDEFINED macro is used directly in configure.ac.
---
 configure.ac        |   70 ++++++------
 m4/attributes.m4    |  311 ---------------------------------------------------
 m4/ax_check_flag.m4 |  147 ++++++++++++++++++++++++
 src/Makefile.am     |    2 +-
 4 files changed, 181 insertions(+), 349 deletions(-)

diff --git a/configure.ac b/configure.ac
index 458c184..6de376e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -147,53 +147,45 @@ case "$host_os" in
 esac
 
 
-#### Flags ####
+#### Compiler flags ####
 
-dnl Compiler flags
+AX_APPEND_COMPILE_FLAGS(
+    [-Wall -W -Wextra -pipe -Wno-long-long -Wvla -Wno-overlength-strings -Wunsafe-loop-optimizations -Wundef -Wformat=2 -Wlogical-op -Wsign-compare -Wformat-security -Wmissing-include-dirs -Wformat-nonliteral -Wold-style-definition -Wpointer-arith -Winit-self -Wdeclaration-after-statement -Wfloat-equal -Wmissing-prototypes -Wstrict-prototypes -Wredundant-decls -Wmissing-declarations -Wmissing-noreturn -Wshadow -Wendif-labels -Wcast-align -Wstrict-aliasing -Wwrite-strings -Wno-unused-parameter -ffast-math -Wp,-D_FORTIFY_SOURCE=2 -fno-common -fdiagnostics-show-option],
+    [], [-pedantic -Werror])
 
-# Some compilers (e.g. clang) default to a warning on an unkown command line option.
-# Change that temporarily to an error, for the CC_CHECK_CFLAGS_APPEND macro to work.
-save_CC="$CC"
-CC="$CC -Werror"
-CC_CHECK_CFLAGS_APPEND([-Wall -W -Wextra -pipe -Wno-long-long -Wvla -Wno-overlength-strings -Wunsafe-loop-optimizations -Wundef -Wformat=2 -Wlogical-op -Wsign-compare -Wformat-security -Wmissing-include-dirs -Wformat-nonliteral -Wold-style-definition -Wpointer-arith -Winit-self -Wdeclaration-after-statement -Wfloat-equal -Wmissing-prototypes -Wstrict-prototypes -Wredundant-decls -Wmissing-declarations -Wmissing-noreturn -Wshadow -Wendif-labels -Wcast-align -Wstrict-aliasing -Wwrite-strings -Wno-unused-parameter -ffast-math -Wp,-D_FORTIFY_SOURCE=2 -fno-common -fdiagnostics-show-option])
-CC="$save_CC"
 
-dnl Linker flags.
-dnl Check whether the linker supports the -version-script option.
+#### Linker flags ####
 
-dnl This variable is used to make sure ${srcdir} is expanded and not
-dnl passed to the CC_CHECK_LDFLAGS macro as a name.
-tmp_ldflag="-Wl,-version-script=${srcdir}/src/map-file"
-
-CC_CHECK_LDFLAGS([${tmp_ldflag}],
+# Check whether the linker supports the -version-script option.
+# The Make variable $(srcdir) needs to be in the LDFLAGS in that form,
+# so that it is expanded the right way in every subdir.
+AX_CHECK_LINK_FLAG(["-Wl,-version-script=${srcdir}/src/map-file"],
     [VERSIONING_LDFLAGS='-Wl,-version-script=$(srcdir)/map-file'])
 AC_SUBST([VERSIONING_LDFLAGS])
 
-dnl Use immediate (now) bindings; avoids the funky re-call in itself
-dnl  the -z now syntax is lifted from Sun's linker and works with GNU's too
-dnl  other linkes might be added later
-CC_CHECK_LDFLAGS([-Wl,-z,now], [IMMEDIATE_LDFLAGS="-Wl,-z,now"])
+# Use immediate (now) bindings; avoids the funky re-call in itself.
+# The -z now syntax is lifted from Sun's linker and works with GNU's too, other linkers might be added later.
+AX_APPEND_LINK_FLAGS([-Wl,-z,now], [IMMEDIATE_LDFLAGS])
 AC_SUBST([IMMEDIATE_LDFLAGS])
 
-dnl On ELF systems we don't want the libraries to be unloaded since we
-dnl don't clean them up properly, so we request the nodelete flag to be
-dnl enabled.
-dnl
-dnl On other systems, we don't really know how to do that, but it's
-dnl welcome if somebody can tell.
-CC_CHECK_LDFLAGS([-Wl,-z,nodelete], [NODELETE_LDFLAGS="-Wl,-z,nodelete"])
+# On ELF systems we don't want the libraries to be unloaded since we don't clean them up properly,
+# so we request the nodelete flag to be enabled.
+# On other systems, we don't really know how to do that, but it's welcome if somebody can tell.
+AX_APPEND_LINK_FLAGS([-Wl,-z,nodelete], [NODELETE_LDFLAGS])
 AC_SUBST([NODELETE_LDFLAGS])
 
-dnl Check for the proper way to build libraries that have no undefined
-dnl symbols; on some hosts this needs to be avoided but the macro
-dnl takes care of it.
-CC_NOUNDEFINED
-
-dnl Check whether to build tests by default (as compile-test) or not
-AC_ARG_ENABLE([default-build-tests],
-    AS_HELP_STRING([--disable-default-build-tests], [Build test programs only during make check]))
-
-AM_CONDITIONAL([BUILD_TESTS_DEFAULT], [test "x$enable_default_build_tests" != "xno"])
+# Check for the proper way to build libraries that have no undefined symbols
+case $host in
+    # FreeBSD (et al.) does not complete linking for shared objects when pthreads
+    # are requested, as different implementations are present.
+    *-freebsd* | *-openbsd*) ;;
+    *)
+        for possible_flag in "-Wl,--no-undefined" "-Wl,-z,defs"; do
+            AX_CHECK_LINK_FLAG([$possible_flag], [NOUNDEFINED_LDFLAGS="$possible_flag"; break])
+        done
+    ;;
+esac
+AC_SUBST([NOUNDEFINED_LDFLAGS])
 
 
 #### Atomic operations ####
@@ -1132,6 +1124,11 @@ fi
 
 AC_DEFINE_UNQUOTED(PA_CFLAGS, "$CFLAGS", [The CFLAGS used during compilation])
 
+# Check whether to build tests by default (as compile-test) or not
+AC_ARG_ENABLE([default-build-tests],
+    AS_HELP_STRING([--disable-default-build-tests], [Build test programs only during make check]))
+AM_CONDITIONAL([BUILD_TESTS_DEFAULT], [test "x$enable_default_build_tests" != "xno"])
+
 AC_ARG_ENABLE([legacy-runtime-dir],
         AS_HELP_STRING([--disable-legacy-runtime-dir], [Try to connect on legacy (< 0.9.12) socket paths.]))
 if test "x$enable_legacy_runtime_dir" != "xno" ; then
@@ -1147,7 +1144,6 @@ AC_DEFINE([WIBBLE], 1, [Just a test.])
 
 AC_ARG_ENABLE([static-bins],
     AS_HELP_STRING([--enable-static-bins],[Statically link executables.]))
-
 AM_CONDITIONAL([STATIC_BINS], [test "x$enable_static_bins" = "xyes"])
 
 AC_ARG_WITH(
diff --git a/m4/attributes.m4 b/m4/attributes.m4
deleted file mode 100644
index 28fac27..0000000
--- a/m4/attributes.m4
+++ /dev/null
@@ -1,311 +0,0 @@
-dnl Macros to check the presence of generic (non-typed) symbols.
-dnl Copyright (c) 2006-2008 Diego Petten? <flameeyes at gmail.com>
-dnl Copyright (c) 2006-2008 xine project
-dnl
-dnl This program is free software; you can redistribute it and/or modify
-dnl it under the terms of the GNU General Public License as published by
-dnl the Free Software Foundation; either version 2, or (at your option)
-dnl any later version.
-dnl
-dnl This program is distributed in the hope that it will be useful,
-dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
-dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-dnl GNU General Public License for more details.
-dnl
-dnl You should have received a copy of the GNU General Public License
-dnl along with this program; if not, write to the Free Software
-dnl Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
-dnl 02110-1301, USA.
-dnl
-dnl As a special exception, the copyright owners of the
-dnl macro gives unlimited permission to copy, distribute and modify the
-dnl configure scripts that are the output of Autoconf when processing the
-dnl Macro. You need not follow the terms of the GNU General Public
-dnl License when using or distributing such scripts, even though portions
-dnl of the text of the Macro appear in them. The GNU General Public
-dnl License (GPL) does govern all other use of the material that
-dnl constitutes the Autoconf Macro.
-dnl 
-dnl This special exception to the GPL applies to versions of the
-dnl Autoconf Macro released by this project. When you make and
-dnl distribute a modified version of the Autoconf Macro, you may extend
-dnl this special exception to the GPL to apply to your modified version as
-dnl well.
-
-dnl Check if the flag is supported by compiler
-dnl CC_CHECK_CFLAGS_SILENT([FLAG], [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND])
-
-AC_DEFUN([CC_CHECK_CFLAGS_SILENT], [
-  AC_CACHE_VAL(AS_TR_SH([cc_cv_cflags_$1]),
-    [ac_save_CFLAGS="$CFLAGS"
-     CFLAGS="$CFLAGS $1"
-     AC_COMPILE_IFELSE([int a;],
-       [eval "AS_TR_SH([cc_cv_cflags_$1])='yes'"],
-       [eval "AS_TR_SH([cc_cv_cflags_$1])='no'"])
-     CFLAGS="$ac_save_CFLAGS"
-    ])
-
-  AS_IF([eval test x$]AS_TR_SH([cc_cv_cflags_$1])[ = xyes],
-    [$2], [$3])
-])
-
-dnl Check if the flag is supported by compiler (cacheable)
-dnl CC_CHECK_CFLAGS([FLAG], [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND])
-
-AC_DEFUN([CC_CHECK_CFLAGS], [
-  AC_CACHE_CHECK([if $CC supports $1 flag],
-    AS_TR_SH([cc_cv_cflags_$1]),
-    CC_CHECK_CFLAGS_SILENT([$1]) dnl Don't execute actions here!
-  )
-
-  AS_IF([eval test x$]AS_TR_SH([cc_cv_cflags_$1])[ = xyes],
-    [$2], [$3])
-])
-
-dnl CC_CHECK_CFLAG_APPEND(FLAG, [action-if-found], [action-if-not-found])
-dnl Check for CFLAG and appends them to CFLAGS if supported
-AC_DEFUN([CC_CHECK_CFLAG_APPEND], [
-  AC_CACHE_CHECK([if $CC supports $1 flag],
-    AS_TR_SH([cc_cv_cflags_$1]),
-    CC_CHECK_CFLAGS_SILENT([$1]) dnl Don't execute actions here!
-  )
-
-  AS_IF([eval test x$]AS_TR_SH([cc_cv_cflags_$1])[ = xyes],
-    [CFLAGS="$CFLAGS $1"; DEBUG_CFLAGS="$DEBUG_CFLAGS $1"; $2], [$3])
-])
-
-dnl CC_CHECK_CFLAGS_APPEND([FLAG1 FLAG2], [action-if-found], [action-if-not])
-AC_DEFUN([CC_CHECK_CFLAGS_APPEND], [
-  for flag in $1; do
-    CC_CHECK_CFLAG_APPEND($flag, [$2], [$3])
-  done
-])
-
-dnl Check if the flag is supported by linker (cacheable)
-dnl CC_CHECK_LDFLAGS([FLAG], [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND])
-
-AC_DEFUN([CC_CHECK_LDFLAGS], [
-  AC_CACHE_CHECK([if $CC supports $1 flag],
-    AS_TR_SH([cc_cv_ldflags_$1]),
-    [ac_save_LDFLAGS="$LDFLAGS"
-     LDFLAGS="$LDFLAGS $1"
-     AC_LINK_IFELSE([int main() { return 1; }],
-       [eval "AS_TR_SH([cc_cv_ldflags_$1])='yes'"],
-       [eval "AS_TR_SH([cc_cv_ldflags_$1])="])
-     LDFLAGS="$ac_save_LDFLAGS"
-    ])
-
-  AS_IF([eval test x$]AS_TR_SH([cc_cv_ldflags_$1])[ = xyes],
-    [$2], [$3])
-])
-
-dnl define the LDFLAGS_NOUNDEFINED variable with the correct value for
-dnl the current linker to avoid undefined references in a shared object.
-AC_DEFUN([CC_NOUNDEFINED], [
-  dnl We check $host for which systems to enable this for.
-  AC_REQUIRE([AC_CANONICAL_HOST])
-
-  case $host in
-     dnl FreeBSD (et al.) does not complete linking for shared objects when pthreads
-     dnl are requested, as different implementations are present; to avoid problems
-     dnl use -Wl,-z,defs only for those platform not behaving this way.
-     *-freebsd* | *-openbsd*) ;;
-     *)
-        dnl First of all check for the --no-undefined variant of GNU ld. This allows
-        dnl for a much more readable commandline, so that people can understand what
-        dnl it does without going to look for what the heck -z defs does.
-        for possible_flags in "-Wl,--no-undefined" "-Wl,-z,defs"; do
-          CC_CHECK_LDFLAGS([$possible_flags], [LDFLAGS_NOUNDEFINED="$possible_flags"])
-	  break
-        done
-	;;
-  esac
-
-  AC_SUBST([LDFLAGS_NOUNDEFINED])
-])
-
-dnl Check for a -Werror flag or equivalent. -Werror is the GCC
-dnl and ICC flag that tells the compiler to treat all the warnings
-dnl as fatal. We usually need this option to make sure that some
-dnl constructs (like attributes) are not simply ignored.
-dnl
-dnl Other compilers don't support -Werror per se, but they support
-dnl an equivalent flag:
-dnl  - Sun Studio compiler supports -errwarn=%all
-AC_DEFUN([CC_CHECK_WERROR], [
-  AC_CACHE_CHECK(
-    [for $CC way to treat warnings as errors],
-    [cc_cv_werror],
-    [CC_CHECK_CFLAGS_SILENT([-Werror], [cc_cv_werror=-Werror],
-      [CC_CHECK_CFLAGS_SILENT([-errwarn=%all], [cc_cv_werror=-errwarn=%all])])
-    ])
-])
-
-AC_DEFUN([CC_CHECK_ATTRIBUTE], [
-  AC_REQUIRE([CC_CHECK_WERROR])
-  AC_CACHE_CHECK([if $CC supports __attribute__(( ifelse([$2], , [$1], [$2]) ))],
-    AS_TR_SH([cc_cv_attribute_$1]),
-    [ac_save_CFLAGS="$CFLAGS"
-     CFLAGS="$CFLAGS $cc_cv_werror"
-     AC_COMPILE_IFELSE([$3],
-       [eval "AS_TR_SH([cc_cv_attribute_$1])='yes'"],
-       [eval "AS_TR_SH([cc_cv_attribute_$1])='no'"])
-     CFLAGS="$ac_save_CFLAGS"
-    ])
-
-  AS_IF([eval test x$]AS_TR_SH([cc_cv_attribute_$1])[ = xyes],
-    [AC_DEFINE(
-       AS_TR_CPP([SUPPORT_ATTRIBUTE_$1]), 1,
-         [Define this if the compiler supports __attribute__(( ifelse([$2], , [$1], [$2]) ))]
-         )
-     $4],
-    [$5])
-])
-
-AC_DEFUN([CC_ATTRIBUTE_CONSTRUCTOR], [
-  CC_CHECK_ATTRIBUTE(
-    [constructor],,
-    [void __attribute__((constructor)) ctor() { int a; }],
-    [$1], [$2])
-])
-
-AC_DEFUN([CC_ATTRIBUTE_FORMAT], [
-  CC_CHECK_ATTRIBUTE(
-    [format], [format(printf, n, n)],
-    [void __attribute__((format(printf, 1, 2))) printflike(const char *fmt, ...) { fmt = (void *)0; }],
-    [$1], [$2])
-])
-
-AC_DEFUN([CC_ATTRIBUTE_FORMAT_ARG], [
-  CC_CHECK_ATTRIBUTE(
-    [format_arg], [format_arg(printf)],
-    [char *__attribute__((format_arg(1))) gettextlike(const char *fmt) { fmt = (void *)0; }],
-    [$1], [$2])
-])
-
-AC_DEFUN([CC_ATTRIBUTE_VISIBILITY], [
-  CC_CHECK_ATTRIBUTE(
-    [visibility_$1], [visibility("$1")],
-    [void __attribute__((visibility("$1"))) $1_function() { }],
-    [$2], [$3])
-])
-
-AC_DEFUN([CC_ATTRIBUTE_NONNULL], [
-  CC_CHECK_ATTRIBUTE(
-    [nonnull], [nonnull()],
-    [void __attribute__((nonnull())) some_function(void *foo, void *bar) { foo = (void*)0; bar = (void*)0; }],
-    [$1], [$2])
-])
-
-AC_DEFUN([CC_ATTRIBUTE_UNUSED], [
-  CC_CHECK_ATTRIBUTE(
-    [unused], ,
-    [void some_function(void *foo, __attribute__((unused)) void *bar);],
-    [$1], [$2])
-])
-
-AC_DEFUN([CC_ATTRIBUTE_SENTINEL], [
-  CC_CHECK_ATTRIBUTE(
-    [sentinel], ,
-    [void some_function(void *foo, ...) __attribute__((sentinel));],
-    [$1], [$2])
-])
-
-AC_DEFUN([CC_ATTRIBUTE_DEPRECATED], [
-  CC_CHECK_ATTRIBUTE(
-    [deprecated], ,
-    [void some_function(void *foo, ...) __attribute__((deprecated));],
-    [$1], [$2])
-])
-
-AC_DEFUN([CC_ATTRIBUTE_ALIAS], [
-  CC_CHECK_ATTRIBUTE(
-    [alias], [weak, alias],
-    [void other_function(void *foo) { }
-     void some_function(void *foo) __attribute__((weak, alias("other_function")));],
-    [$1], [$2])
-])
-
-AC_DEFUN([CC_ATTRIBUTE_MALLOC], [
-  CC_CHECK_ATTRIBUTE(
-    [malloc], ,
-    [void * __attribute__((malloc)) my_alloc(int n);],
-    [$1], [$2])
-])
-
-AC_DEFUN([CC_ATTRIBUTE_PACKED], [
-  CC_CHECK_ATTRIBUTE(
-    [packed], ,
-    [struct astructure { char a; int b; long c; void *d; } __attribute__((packed));],
-    [$1], [$2])
-])
-
-AC_DEFUN([CC_ATTRIBUTE_CONST], [
-  CC_CHECK_ATTRIBUTE(
-    [const], ,
-    [int __attribute__((const)) twopow(int n) { return 1 << n; } ],
-    [$1], [$2])
-])
-
-AC_DEFUN([CC_FLAG_VISIBILITY], [
-  AC_REQUIRE([CC_CHECK_WERROR])
-  AC_CACHE_CHECK([if $CC supports -fvisibility=hidden],
-    [cc_cv_flag_visibility],
-    [cc_flag_visibility_save_CFLAGS="$CFLAGS"
-     CFLAGS="$CFLAGS $cc_cv_werror"
-     CC_CHECK_CFLAGS_SILENT([-fvisibility=hidden],
-	cc_cv_flag_visibility='yes',
-	cc_cv_flag_visibility='no')
-     CFLAGS="$cc_flag_visibility_save_CFLAGS"])
-  
-  AS_IF([test "x$cc_cv_flag_visibility" = "xyes"],
-    [AC_DEFINE([SUPPORT_FLAG_VISIBILITY], 1,
-       [Define this if the compiler supports the -fvisibility flag])
-     $1],
-    [$2])
-])
-
-AC_DEFUN([CC_FUNC_EXPECT], [
-  AC_REQUIRE([CC_CHECK_WERROR])
-  AC_CACHE_CHECK([if compiler has __builtin_expect function],
-    [cc_cv_func_expect],
-    [ac_save_CFLAGS="$CFLAGS"
-     CFLAGS="$CFLAGS $cc_cv_werror"
-     AC_COMPILE_IFELSE(
-       [int some_function() {
-        int a = 3;
-        return (int)__builtin_expect(a, 3);
-	}],
-       [cc_cv_func_expect=yes],
-       [cc_cv_func_expect=no])
-     CFLAGS="$ac_save_CFLAGS"
-    ])
-
-  AS_IF([test "x$cc_cv_func_expect" = "xyes"],
-    [AC_DEFINE([SUPPORT__BUILTIN_EXPECT], 1,
-     [Define this if the compiler supports __builtin_expect() function])
-     $1],
-    [$2])
-])
-
-AC_DEFUN([CC_ATTRIBUTE_ALIGNED], [
-  AC_REQUIRE([CC_CHECK_WERROR])
-  AC_CACHE_CHECK([highest __attribute__ ((aligned ())) supported],
-    [cc_cv_attribute_aligned],
-    [ac_save_CFLAGS="$CFLAGS"
-     CFLAGS="$CFLAGS $cc_cv_werror"
-     for cc_attribute_align_try in 64 32 16 8 4 2; do
-        AC_COMPILE_IFELSE([
-          int main() {
-            static char c __attribute__ ((aligned($cc_attribute_align_try))) = 0;
-            return c;
-          }], [cc_cv_attribute_aligned=$cc_attribute_align_try; break])
-     done
-     CFLAGS="$ac_save_CFLAGS"
-  ])
-
-  if test "x$cc_cv_attribute_aligned" != "x"; then
-     AC_DEFINE_UNQUOTED([ATTRIBUTE_ALIGNED_MAX], [$cc_cv_attribute_aligned],
-       [Define the highest alignment supported])
-  fi
-])
diff --git a/m4/ax_check_flag.m4 b/m4/ax_check_flag.m4
new file mode 100644
index 0000000..52405fd
--- /dev/null
+++ b/m4/ax_check_flag.m4
@@ -0,0 +1,147 @@
+# ===========================================================================
+#       http://www.gnu.org/software/autoconf-archive/ax_check_flag.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_CHECK_PREPROC_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS])
+#   AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS])
+#   AX_CHECK_LINK_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS])
+#   AX_APPEND_FLAG(FLAG, [FLAGS-VARIABLE])
+#   AX_APPEND_COMPILE_FLAGS([FLAG1 FLAG2 ...], [FLAGS-VARIABLE], [EXTRA-FLAGS])
+#   AX_APPEND_LINK_FLAGS([FLAG1 FLAG2 ...], [FLAGS-VARIABLE], [EXTRA-FLAGS])
+#
+# DESCRIPTION
+#
+#   Check whether the given FLAG works with the current language's
+#   preprocessor/compiler/linker, or whether they give an error. (Warnings,
+#   however, are ignored.)
+#
+#   ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
+#   success/failure.
+#
+#   If EXTRA-FLAGS is defined, it is added to the current language's default
+#   flags (e.g.  CFLAGS) when the check is done.  The check us thus made
+#   with the following flags: "CFLAGS EXTRA-FLAGS FLAG".  EXTRA-FLAGS can
+#   for example be used to force the compiler to issue an error when a bad
+#   flag is given.
+#
+#   AX_APPEND_FLAG appends the FLAG to the FLAG-VARIABLE shell variable or
+#   the current language's flags if not specified.  FLAG is not added to
+#   FLAG-VARIABLE if it is already in the shell variable.
+#
+#   AX_APPEND_COMPILE_FLAGS checks for each FLAG1, FLAG2, etc. using
+#   AX_CHECK_COMPILE_FLAG and if the check is successful the flag is added
+#   to the appropriate FLAGS variable with AX_APPEND_FLAG.  The
+#   FLAGS-VARIABLE and EXTRA-FLAGS arguments are the same as in the other
+#   macros. AX_APPEND_LINK_FLAGS does the same for linker flags.
+#
+#   NOTE: Based on AX_CHECK_COMPILER_FLAGS and AX_CFLAGS_GCC_OPTION.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Guido U. Draheim <guidod at gmx.de>
+#   Copyright (c) 2009 Steven G. Johnson <stevenj at alum.mit.edu>
+#   Copyright (c) 2009 Matteo Frigo
+#   Copyright (c) 2011 Maarten Bosmans <mkbosmans at gmail.com>
+#
+#   This program is free software: you can redistribute it and/or modify it
+#   under the terms of the GNU General Public License as published by the
+#   Free Software Foundation, either version 3 of the License, or (at your
+#   option) any later version.
+#
+#   This program is distributed in the hope that it will be useful, but
+#   WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+#   Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License along
+#   with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+#   As a special exception, the respective Autoconf Macro's copyright owner
+#   gives unlimited permission to copy, distribute and modify the configure
+#   scripts that are the output of Autoconf when processing the Macro. You
+#   need not follow the terms of the GNU General Public License when using
+#   or distributing such scripts, even though portions of the text of the
+#   Macro appear in them. The GNU General Public License (GPL) does govern
+#   all other use of the material that constitutes the Autoconf Macro.
+#
+#   This special exception to the GPL applies to versions of the Autoconf
+#   Macro released by the Autoconf Archive. When you make and distribute a
+#   modified version of the Autoconf Macro, you may extend this special
+#   exception to the GPL to apply to your modified version as well.
+
+#serial 2
+
+AC_DEFUN([AX_CHECK_PREPROC_FLAG],
+[AC_PREREQ(2.59) dnl for _AC_LANG_PREFIX
+AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]cppflags_$4_$1])dnl
+AC_CACHE_CHECK([whether _AC_LANG preprocessor accepts $1], CACHEVAR, [
+  ax_check_save_flags=$CPPFLAGS
+  CPPFLAGS="$CPPFLAGS $4 $1"
+  AC_PREPROC_IFELSE([AC_LANG_PROGRAM()],
+    [AS_VAR_SET([CACHEVAR],[yes])],
+    [AS_VAR_SET([CACHEVAR],[no])])
+  CPPFLAGS=$ax_check_save_flags])
+AS_VAR_IF([CACHEVAR], "yes",
+  [m4_default([$2], :)],
+  [m4_default([$3], :)])
+AS_VAR_POPDEF([CACHEVAR])dnl
+])dnl AX_CHECK_PREPROC_FLAGS
+
+AC_DEFUN([AX_CHECK_COMPILE_FLAG],
+[AC_PREREQ(2.59) dnl for _AC_LANG_PREFIX
+AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
+AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
+  ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
+  _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
+    [AS_VAR_SET([CACHEVAR],[yes])],
+    [AS_VAR_SET([CACHEVAR],[no])])
+  _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
+AS_VAR_IF([CACHEVAR], "yes",
+  [m4_default([$2], :)],
+  [m4_default([$3], :)])
+AS_VAR_POPDEF([CACHEVAR])dnl
+])dnl AX_CHECK_COMPILE_FLAGS
+
+AC_DEFUN([AX_CHECK_LINK_FLAG],
+[AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_ldflags_$4_$1])dnl
+AC_CACHE_CHECK([whether the linker accepts $1], CACHEVAR, [
+  ax_check_save_flags=$LDFLAGS
+  LDFLAGS="$LDFLAGS $4 $1"
+  AC_LINK_IFELSE([AC_LANG_PROGRAM()],
+    [AS_VAR_SET([CACHEVAR],[yes])],
+    [AS_VAR_SET([CACHEVAR],[no])])
+  LDFLAGS=$ax_check_save_flags])
+AS_VAR_IF([CACHEVAR], "yes",
+  [m4_default([$2], :)],
+  [m4_default([$3], :)])
+AS_VAR_POPDEF([CACHEVAR])dnl
+])dnl AX_CHECK_LINK_FLAGS
+
+
+AC_DEFUN([AX_APPEND_FLAG],
+[AC_PREREQ(2.59) dnl for _AC_LANG_PREFIX
+AC_REQUIRE([AC_PROG_GREP])
+AS_VAR_PUSHDEF([FLAGS], [m4_default($2,_AC_LANG_PREFIX[]FLAGS)])dnl
+AS_VAR_SET_IF([FLAGS],
+  [AS_IF([AS_ECHO(" $[]FLAGS ") | $GREP " $1 " 2>&1 >/dev/null],
+    [AC_RUN_LOG([: FLAGS already contains $1])],
+    [AC_RUN_LOG([: FLAGS="$FLAGS $1"])
+    AS_VAR_APPEND([FLAGS], [" $1"])])],
+  [AS_VAR_SET([FLAGS],[$1])])
+AS_VAR_POPDEF([FLAGS])dnl
+])dnl AX_APPEND_FLAG
+
+AC_DEFUN([AX_APPEND_COMPILE_FLAGS],
+[for flag in $1; do
+  AX_CHECK_COMPILE_FLAG([$flag], [AX_APPEND_FLAG([$flag], [$2])], [], [$3])
+done
+])dnl AX_APPEND_COMPILE_FLAGS
+
+AC_DEFUN([AX_APPEND_LINK_FLAGS],
+[for flag in $1; do
+  AX_CHECK_LINK_FLAG([$flag], [AX_APPEND_FLAG([$flag], [m4_default([$2], [LDFLAGS])])], [], [$3])
+done
+])dnl AX_APPEND_LINK_FLAGS
diff --git a/src/Makefile.am b/src/Makefile.am
index a37e202..9191324 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -86,7 +86,7 @@ endif
 
 FOREIGN_CFLAGS = -w
 
-MODULE_LDFLAGS = $(AM_LDFLAGS) -module -disable-static -avoid-version $(LDFLAGS_NOUNDEFINED)
+MODULE_LDFLAGS = $(AM_LDFLAGS) -module -disable-static -avoid-version $(NOUNDEFINED_LDFLAGS)
 MODULE_LIBADD = $(AM_LIBADD) libpulsecore- at PA_MAJORMINOR@.la libpulsecommon- at PA_MAJORMINOR@.la libpulse.la
 
 ###################################
-- 
1.7.4.1



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