From aee098f1bf0511c6b5544de3170a9e8b51673b60 Mon Sep 17 00:00:00 2001
From: Pierre Le Magourou <plemagourou@softbankrobotics.com>
Date: Tue, 23 Jan 2018 15:25:50 +0100
Subject: [PATCH] linux.gcc: Fix cross compilation error.

When cross compiling on linux with gcc, the host gcc was used instead of
the cross gcc to set compilation flags according to gcc version.

When the cross gcc was in version 5.X and the host gcc in version 7.X,
tbb was compiled with the -flifetime-dse=1 flag that does not exist on
gcc 5.X.
---
 build/linux.gcc.inc | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/build/linux.gcc.inc b/build/linux.gcc.inc
index 5c1889c..a4d6698 100644
--- a/build/linux.gcc.inc
+++ b/build/linux.gcc.inc
@@ -41,29 +41,29 @@ LINK_FLAGS = -Wl,-rpath-link=. -rdynamic
 C_FLAGS = $(CPLUS_FLAGS)
 
 # gcc 4.2 and higher support OpenMP
-ifneq (,$(shell gcc -dumpversion | egrep  "^(4\.[2-9]|[5-9])"))
+ifneq (,$(shell $(CC) -dumpversion | egrep  "^(4\.[2-9]|[5-9])"))
     OPENMP_FLAG = -fopenmp
 endif
 
 # gcc 4.8 and later support RTM intrinsics, but require command line switch to enable them
-ifneq (,$(shell gcc -dumpversion | egrep  "^(4\.[8-9]|[5-9])"))
+ifneq (,$(shell $(CC) -dumpversion | egrep  "^(4\.[8-9]|[5-9])"))
     RTM_KEY = -mrtm
 endif
 
 # gcc 4.0 and later have -Wextra that is used by some our customers.
-ifneq (,$(shell gcc -dumpversion | egrep  "^([4-9])"))
+ifneq (,$(shell $(CC) -dumpversion | egrep  "^([4-9])"))
     TEST_WARNING_KEY += -Wextra
 endif
 
 # gcc 5.0 and later have -Wsuggest-override option
 # enable it via a pre-included header in order to limit to C++11 and above
-ifneq (,$(shell gcc -dumpversion | egrep  "^([5-9])"))
+ifneq (,$(shell $(CC) -dumpversion | egrep  "^([5-9])"))
     INCLUDE_TEST_HEADERS = -include $(tbb_root)/src/test/harness_preload.h
 endif
 
 # gcc 6.0 and later have -flifetime-dse option that controls
 # elimination of stores done outside the object lifetime
-ifneq (,$(shell gcc -dumpversion | egrep  "^([6-9])"))
+ifneq (,$(shell $(CC) -dumpversion | egrep  "^([6-9])"))
     # keep pre-contruction stores for zero initialization
     DSE_KEY = -flifetime-dse=1
 endif
-- 
2.15.1