mk: fix detection of SSE4.2 on FreeBSD

[dpdk.git] / mk / machine / native / rte.vars.mk

diff --git a/mk/machine/native/rte.vars.mk b/mk/machine/native/rte.vars.mk
index da9aa71..6ce0c72 100644 (file)
--- 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 CPU type 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