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authorJan Engelhardt <jengelh@medozas.de>2010-09-13 16:06:50 +0200
committerJan Engelhardt <jengelh@medozas.de>2010-09-13 23:42:56 +0200
commit655ae6b096b7ba3854159dc1eefadce91ec65550 (patch)
treee79a15fd586f3f818c33bbf8b2faa68ac8c09f4d /m4
parent5429b41c2bb4ac8fe672a1513a041c0ed0c241f6 (diff)
libiptc: build with -Wl,--no-as-needed
Since libiptc does not reference any symbols in libip(4|6)tc, the linker may ignore the dependencies. Use --no-as-needed to explicitly force a DT_NEEDED entry. References: http://bugzilla.netfilter.org/show_bug.cgi?id=674 Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Diffstat (limited to 'm4')
-rw-r--r--m4/ax_check_linker_flags.m478
1 files changed, 78 insertions, 0 deletions
diff --git a/m4/ax_check_linker_flags.m4 b/m4/ax_check_linker_flags.m4
new file mode 100644
index 00000000..ba7bf3cf
--- /dev/null
+++ b/m4/ax_check_linker_flags.m4
@@ -0,0 +1,78 @@
+#http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=blob_plain;f=m4/ax_check_linker_flags.m4
+# ===========================================================================
+# http://www.gnu.org/software/autoconf-archive/ax_check_linker_flags.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_CHECK_LINKER_FLAGS(FLAGS, [ACTION-SUCCESS], [ACTION-FAILURE])
+#
+# DESCRIPTION
+#
+# Check whether the given linker FLAGS work with the current language's
+# linker, or whether they give an error.
+#
+# ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
+# success/failure.
+#
+# NOTE: Based on AX_CHECK_COMPILER_FLAGS.
+#
+# LICENSE
+#
+# Copyright (c) 2009 Mike Frysinger <vapier@gentoo.org>
+# Copyright (c) 2009 Steven G. Johnson <stevenj@alum.mit.edu>
+# Copyright (c) 2009 Matteo Frigo
+#
+# 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 6
+
+AC_DEFUN([AX_CHECK_LINKER_FLAGS],
+[AC_MSG_CHECKING([whether the linker accepts $1])
+dnl Some hackery here since AC_CACHE_VAL can't handle a non-literal varname:
+AS_LITERAL_IF([$1],
+ [AC_CACHE_VAL(AS_TR_SH(ax_cv_linker_flags_[$1]), [
+ ax_save_FLAGS=$LDFLAGS
+ LDFLAGS="$1"
+ AC_LINK_IFELSE([AC_LANG_PROGRAM()],
+ AS_TR_SH(ax_cv_linker_flags_[$1])=yes,
+ AS_TR_SH(ax_cv_linker_flags_[$1])=no)
+ LDFLAGS=$ax_save_FLAGS])],
+ [ax_save_FLAGS=$LDFLAGS
+ LDFLAGS="$1"
+ AC_LINK_IFELSE([AC_LANG_PROGRAM()],
+ eval AS_TR_SH(ax_cv_linker_flags_[$1])=yes,
+ eval AS_TR_SH(ax_cv_linker_flags_[$1])=no)
+ LDFLAGS=$ax_save_FLAGS])
+eval ax_check_linker_flags=$AS_TR_SH(ax_cv_linker_flags_[$1])
+AC_MSG_RESULT($ax_check_linker_flags)
+if test "x$ax_check_linker_flags" = xyes; then
+ m4_default([$2], :)
+else
+ m4_default([$3], :)
+fi
+])dnl AX_CHECK_LINKER_FLAGS