diff options
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/openvswitch.m4 | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/m4/openvswitch.m4 b/m4/openvswitch.m4 index 0b22f64e..6fb86099 100644 --- 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]) |