DPDK 2.0 contains an updated implementation of rte_memcopy, which
leverages SSE and AVX instrinsics. In versions of GCC <= 4.8.2, it
has been observed that the relevant instrinsics are not defined in
gcc headers, resulting in compile-time errors.
This issue is resolved by enabling the 'mssse3' flag at compile time;
however, it's not possible to pass an additional flag via the command
line without overwriting an existing compiler variable.
Introduce an additonal configuration option to resolve this.
Signed-off-by: Mark Kavanagh <mark.b.kavan...@intel.com>
---
acinclude.m4 | 11 +++++++++++
configure.ac | 1 +
2 files changed, 12 insertions(+)
diff --git a/acinclude.m4 b/acinclude.m4
index 479da2e..71d3795 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -25,6 +25,17 @@ AC_DEFUN([OVS_ENABLE_WERROR],
OVS_CFLAGS="$OVS_CFLAGS -Werror"
fi])])
+dnl OVS_ENABLE_SSSE3
+AC_DEFUN([OVS_ENABLE_SSSE3],
+ [AC_ARG_ENABLE(
+ [mssse3],
+ [AC_HELP_STRING([--enable-ssse3], [Add -mssse3 to CFLAGS])],
+ [], [enable_mssse3=no])
+ AC_CONFIG_COMMANDS_PRE(
+ [if test "X$enable_ssse3" = Xyes; then
+ OVS_CFLAGS="$OVS_CFLAGS -mssse3"
+ fi])])
+
dnl OVS_CHECK_LINUX
dnl
dnl Configure linux kernel source tree
diff --git a/configure.ac b/configure.ac
index 8d47eb9..c5836ed 100644
--- a/configure.ac
+++ b/configure.ac
@@ -158,6 +158,7 @@ OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
OVS_CONDITIONAL_CC_OPTION([-Wno-unused-parameter], [HAVE_WNO_UNUSED_PARAMETER])
OVS_ENABLE_WERROR
OVS_ENABLE_SPARSE
+OVS_ENABLE_SSSE3
AC_ARG_VAR(KARCH, [Kernel Architecture String])
AC_SUBST(KARCH)
--
1.9.3
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