X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=acinclude.m4;h=d502b000d4b56001f02c37c9e376a27e71e444fa;hb=8706009e555bb9fa04a5679e4be2c7c67506802b;hp=8bd4544b5d27431255dc07c5aebf973994a71bde;hpb=372d58a4e3d735a269856d1f285b5ed1b99f6dce;p=sliver-openvswitch.git

diff --git a/acinclude.m4 b/acinclude.m4
index 8bd4544b5..d502b000d 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -288,7 +288,7 @@ AC_DEFUN([OVS_CHECK_IF_PACKET],
                 [Define to 1 if net/if_packet.h is available.])
    fi])
 
-dnl Checks for net/if_dl.h
+dnl Checks for net/if_dl.h.
 AC_DEFUN([OVS_CHECK_IF_DL],
   [AC_CHECK_HEADER([net/if_dl.h],
                    [HAVE_IF_DL=yes],
@@ -427,6 +427,27 @@ EOF
         ovs_cv_gnu_make_if=no
       fi])])
 
+dnl OVS_CHECK_GNU_MAKE
+dnl
+dnl Checks whether make is GNU make (because Linux kernel Makefiles
+dnl only work with GNU make).
+AC_DEFUN([OVS_CHECK_GNU_MAKE],
+  [AC_CACHE_CHECK(
+     [whether ${MAKE-make} is GNU make],
+     [ovs_cv_gnu_make],
+     [rm -f conftest.out
+      AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} --version:"]) >&AS_MESSAGE_LOG_FD 2>&1
+      ${MAKE-make} --version >conftest.out 2>&1
+      cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
+      result=`cat conftest.out`
+      rm -f conftest.mk conftest.out
+
+      case $result in # (
+        GNU*) ovs_cv_gnu_make=yes ;; # (
+        *) ovs_cv_gnu_make=no ;;
+      esac])
+   AM_CONDITIONAL([GNU_MAKE], [test $ovs_cv_gnu_make = yes])])
+
 dnl OVS_CHECK_SPARSE_TARGET
 dnl
 dnl The "cgcc" script from "sparse" isn't very good at detecting the