[dpdk-dev] [PATCH v2 3/6] mk: Ensure correct detection of SSE4.2 on FreeBSD

[Bruce Richardson <bruce.richardson@intel.com>]

Add a special case to the native target makefile, where we check if
-march=native shows SSE4.2 support. If it does not, then not everything may
build, so we check if the hardware supports SSE4.2, and use a corei7 target
explicitly to get the SSE4.2 support.

New in V2:
* Re-enable ACL library for FreeBSD using gcc, which requires SSE4.2
* Adjust SSE42 detection command based on feedback from Thomas Monjalon

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 config/defconfig_x86_64-native-bsdapp-gcc |  5 -----
 mk/machine/native/rte.vars.mk             | 12 ++++++++++++
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/config/defconfig_x86_64-native-bsdapp-gcc b/config/defconfig_x86_64-native-bsdapp-gcc
index 2234193..e91738b 100644
--- a/config/defconfig_x86_64-native-bsdapp-gcc
+++ b/config/defconfig_x86_64-native-bsdapp-gcc
@@ -69,8 +69,3 @@ CONFIG_RTE_ARCH_X86_64=y
 #
 CONFIG_RTE_TOOLCHAIN="gcc"
 CONFIG_RTE_TOOLCHAIN_GCC=y
-
-#
-# GCC doesn't detect SSE4.x support correctly on BSD, so disable ACL lib
-#
-CONFIG_RTE_LIBRTE_ACL=n
diff --git a/mk/machine/native/rte.vars.mk b/mk/machine/native/rte.vars.mk
index da9aa71..baabb39 100644
--- a/mk/machine/native/rte.vars.mk
+++ b/mk/machine/native/rte.vars.mk
@@ -56,3 +56,15 @@
 # CPU_ASFLAGS =
 
 MACHINE_CFLAGS = -march=native
+
+# on FreeBSD systems, sometimes the correct cputype is not picked up.
+# To get everything to compile, we need SSE4.2 support, so check if that is
+# reported by compiler. If not, check if the CPU actually supports it, and if
+# so, set the compilation target to be a corei7, minimum target with SSE4.2
+SSE42_SUPPORT=$(shell $(CC) -march=native -dM -E - < /dev/null | grep SSE4_2)
+ifeq ($(SSE42_SUPPORT),)
+  CPU_SSE42_SUPPORT=$(shell grep SSE4\.2 /var/run/dmesg.boot 2>/dev/null)
+  ifneq ($(CPU_SSE42_SUPPORT),)
+    MACHINE_CFLAGS= -march=corei7
+  endif
+endif
-- 
2.0.0