vlog: Make the vlog module catalog program-specific.

[sliver-openvswitch.git] / m4 / openvswitch.m4

diff --git a/m4/openvswitch.m4 b/m4/openvswitch.m4
index 0b22f64..6fb8609 100644 (file)
--- a/m4/openvswitch.m4
+++ b/m4/openvswitch.m4
@@ -347,3 +347,78 @@ AC_DEFUN([OVS_CHECK_OVSDBMONITOR],
    AC_MSG_CHECKING([whether to build ovsdbmonitor])
    AC_MSG_RESULT([$BUILD_OVSDBMONITOR])
    AM_CONDITIONAL([BUILD_OVSDBMONITOR], [test $BUILD_OVSDBMONITOR = yes])])
+
+# OVS_LINK2_IFELSE(SOURCE1, SOURCE2, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
+# -------------------------------------------------------------
+# Based on AC_LINK_IFELSE, but tries to link both SOURCE1 and SOURCE2
+# into a program.
+#
+# This macro is borrowed from acinclude.m4 in GNU PSPP, which has the
+# following license:
+#
+#     Copyright (C) 2005, 2006, 2007, 2009 Free Software Foundation, Inc.
+#     This file is free software; the Free Software Foundation
+#     gives unlimited permission to copy and/or distribute it,
+#     with or without modifications, as long as this notice is preserved.
+#
+m4_define([OVS_LINK2_IFELSE],
+[m4_ifvaln([$1], [AC_LANG_CONFTEST([$1])])dnl
+mv conftest.$ac_ext conftest1.$ac_ext
+m4_ifvaln([$2], [AC_LANG_CONFTEST([$2])])dnl
+mv conftest.$ac_ext conftest2.$ac_ext
+rm -f conftest1.$ac_objext conftest2.$ac_objext conftest$ac_exeext
+ovs_link2='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest1.$ac_ext conftest2.$ac_ext $LIBS >&5'
+AS_IF([_AC_DO_STDERR($ovs_link2) && {
+        test -z "$ac_[]_AC_LANG_ABBREV[]_werror_flag" ||
+        test ! -s conftest.err
+       } && test -s conftest$ac_exeext && {
+        test "$cross_compiling" = yes ||
+        AS_TEST_X([conftest$ac_exeext])
+       }],
+      [$3],
+      [echo "$as_me: failed source file 1 of 2 was:" >&5
+sed 's/^/| /' conftest1.$ac_ext >&5
+echo "$as_me: failed source file 2 of 2 was:" >&5
+sed 's/^/| /' conftest2.$ac_ext >&5
+       $4])
+dnl Delete also the IPA/IPO (Inter Procedural Analysis/Optimization)
+dnl information created by the PGI compiler (conftest_ipa8_conftest.oo),
+dnl as it would interfere with the next link command.
+rm -rf conftest.dSYM conftest1.dSYM conftest2.dSYM
+rm -f core conftest.err conftest1.err conftest2.err
+rm -f conftest1.$ac_objext conftest2.$ac_objext conftest*_ipa8_conftest*.oo
+rm -f conftest$ac_exeext
+rm -f m4_ifval([$1], [conftest1.$ac_ext]) m4_ifval([$2], [conftest1.$ac_ext])[]dnl
+])# OVS_LINK2_IFELSE
+
+dnl Defines USE_LINKER_SECTIONS to 1 if the compiler supports putting
+dnl variables in sections with user-defined names and the linker
+dnl automatically defines __start_SECNAME and __stop_SECNAME symbols
+dnl that designate the start and end of the sections.
+AC_DEFUN([OVS_CHECK_LINKER_SECTIONS],
+  [AC_CACHE_CHECK(
+    [for user-defined linker section support],
+    [ovs_cv_use_linker_sections],
+    [OVS_LINK2_IFELSE(
+      [AC_LANG_SOURCE(
+        [int a __attribute__((__section__("mysection"))) = 1;
+         int b __attribute__((__section__("mysection"))) = 2;
+         int c __attribute__((__section__("mysection"))) = 3;])],
+      [AC_LANG_PROGRAM(
+        [#include <stdio.h>
+         extern int __start_mysection;
+         extern int __stop_mysection;],
+        [int n_ints = &__stop_mysection - &__start_mysection;
+         int *i;
+         for (i = &__start_mysection; i < &__start_mysection + n_ints; i++) {
+             printf("%d\n", *i);
+         }])],
+      [ovs_cv_use_linker_sections=yes],
+      [ovs_cv_use_linker_sections=no])])
+   if test $ovs_cv_use_linker_sections = yes; then
+     AC_DEFINE([USE_LINKER_SECTIONS], [1],
+               [Define to 1 if the compiler support putting variables
+                into sections with user-defined names and the linker
+                automatically defines __start_SECNAME and __stop_SECNAME
+                symbols that designate the start and end of the section.])
+   fi])