From 826c9ef64a983bdc71d7bde591b785f65cf1d268 Mon Sep 17 00:00:00 2001
From: Daniel Verkamp <daniel.verkamp@intel.com>
Date: Fri, 3 Nov 2017 15:55:55 -0700
Subject: [PATCH] build: detect architecture via cc -dumpmachine

Similar to commit 98f84e6255 ("build: detect OS via cc -dumpmachine"),
we can use the C compiler's -dumpmachine output to detect the target
CPU architecture rather than relying on the build machine's uname
output.  This helps enable correct CPU detection when $(CC) is a cross
compiler.

Change-Id: I72c34294a1ff7dd9df3aa45dfc319e5b81d51f85
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
Reviewed-on: https://review.gerrithub.io/385709
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
---
 mk/spdk.common.mk | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mk/spdk.common.mk b/mk/spdk.common.mk
index 59063858a..5cdeebe3e 100644
--- a/mk/spdk.common.mk
+++ b/mk/spdk.common.mk
@@ -57,11 +57,11 @@ ifneq ($(filter freebsd%,$(TARGET_TRIPLET_WORDS)),)
 OS = FreeBSD
 endif
 
+TARGET_MACHINE := $(firstword $(TARGET_TRIPLET_WORDS))
 
 COMMON_CFLAGS = -g $(C_OPT) -Wall -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wmissing-declarations -fno-strict-aliasing -I$(SPDK_ROOT_DIR)/include
 
-UNAME_P := $(shell uname -p)
-ifneq ($(filter ppc%,$(UNAME_P)),)
+ifneq ($(filter powerpc%,$(TARGET_MACHINE)),)
 COMMON_CFLAGS += -mcpu=native
 else
 COMMON_CFLAGS += -march=native