[PATCH 2/7] selftests: add CFLAGS_EXTRA

[Bamvor Jian Zhang]

One may pass the "-I /path/to/headers -L /path/to/lib" through
CFLAGS_EXTRA for cross compiling. mqueue could compile pass
in this way when we provide the popt.h and libpopt.so. And kdbus
could compile pass with sys/capability and libcap.so

Sed-off-by: Bamvor Jian Zhang <bamvor.zhangjian@xxxxxxxxxx>

--
Originally, I want to add something like --sysroot to the compile
which mean the user need to provide the full filesystem including
headers and library for compiler. With CFLAGS_EXTRA, the user only
need to provide the minimal headers and/or librarys for building.
---
 tools/testing/selftests/lib.mk | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk
index ee412ba..1acfd02 100644
--- a/tools/testing/selftests/lib.mk
+++ b/tools/testing/selftests/lib.mk
@@ -2,6 +2,8 @@
 # Makefile can operate with or without the kbuild infrastructure.
 CC := $(CROSS_COMPILE)gcc
 
+CFLAGS += $(CFLAGS_EXTRA)
+
 define RUN_TESTS
 	@for TEST in $(TEST_PROGS); do \
 		(./$$TEST && echo "selftests: $$TEST [PASS]") || echo "selftests: $$TEST [FAIL]"; \
-- 
2.1.4

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