Remove unused USE_LINKER_SECTIONS and OVS_LINK2_IFELSE

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

diff --git a/m4/openvswitch.m4 b/m4/openvswitch.m4
index 7c37985..9b7f0b5 100644 (file)
--- a/m4/openvswitch.m4
+++ b/m4/openvswitch.m4
@@ -118,7 +118,7 @@ OpenFlow connections over SSL will not be supported.
 dnl Checks for libraries needed by lib/socket-util.c.
 AC_DEFUN([OVS_CHECK_SOCKET_LIBS],
   [AC_CHECK_LIB([socket], [connect])
-   AC_SEARCH_LIBS([gethostbyname], [resolv], [RESOLVER_LIBS=-lresolv])])
+   AC_SEARCH_LIBS([gethostbyname], [resolv])])
 
 dnl Checks for the directory in which to store the PKI.
 AC_DEFUN([OVS_CHECK_PKIDIR],
@@ -308,83 +308,6 @@ AC_DEFUN([OVS_CHECK_PYTHON_COMPAT],
    AC_MSG_RESULT([$INCLUDE_PYTHON_COMPAT])
    AM_CONDITIONAL([INCLUDE_PYTHON_COMPAT], [test $INCLUDE_PYTHON_COMPAT = 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
-   AM_CONDITIONAL(
-     [USE_LINKER_SECTIONS], [test $ovs_cv_use_linker_sections = yes])])
-
 dnl Checks for groff.
 AC_DEFUN([OVS_CHECK_GROFF],
   [AC_CACHE_CHECK(
@@ -432,6 +355,12 @@ static thread_local int var;], [return var;])],
      fi
    fi])
 
+dnl OVS_CHECK_ATOMIC_LIBS
+dnl
+dnl Check to see if -latomic is need for GCC atomic built-ins.
+AC_DEFUN([OVS_CHECK_ATOMIC_LIBS],
+   [AC_SEARCH_LIBS([__atomic_load_8], [atomic])])
+
 dnl OVS_CHECK_GCC4_ATOMICS
 dnl
 dnl Checks whether the compiler and linker support GCC 4.0+ atomic built-ins.