linux-kernel - [PATCH v2 6/6] selftests: export INSTALL_HDR_PATH if using "O" to specify output dir

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Date:   Wed, 25 Mar 2020 22:01:33 +0800
From:   Xiaoyao Li <xiaoyao.li@...el.com>
To:     Shuah Khan <shuah@...nel.org>, Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, Xiaoyao Li <xiaoyao.li@...el.com>
Subject: [PATCH v2 6/6] selftests: export INSTALL_HDR_PATH if using "O" to specify output dir

When build kvm selftests in tools/testing/selftests directory with

	make O=/path/to/kselftests TARGETS=kvm

it fails building some kvm test binaries due to lack of header files.

Export INSTALL_HDR_PATH when "O" is specified, so that sub TARGET can get
the right kernel headers with INSTALL_HDR_PATH.

Signed-off-by: Xiaoyao Li <xiaoyao.li@...el.com>
---
 tools/testing/selftests/Makefile | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index be22dbe94a4c..f36bc6fd8086 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -110,6 +110,10 @@ ARCH           ?= $(SUBARCH)
 export KSFT_KHDR_INSTALL_DONE := 1
 export BUILD
 
+ifneq (1,$(DEFAULT_INSTALL_HDR_PATH))
+export	INSTALL_HDR_PATH := $(BUILD)/usr
+endif
+
 # build and run gpio when output directory is the src dir.
 # gpio has dependency on tools/gpio and builds tools/gpio
 # objects in the src directory in all cases making the src
@@ -142,7 +146,7 @@ khdr:
 ifeq (1,$(DEFAULT_INSTALL_HDR_PATH))
 	$(MAKE) --no-builtin-rules ARCH=$(ARCH) -C $(top_srcdir) headers_install
 else
-	$(MAKE) --no-builtin-rules INSTALL_HDR_PATH=$$BUILD/usr \
+	$(MAKE) --no-builtin-rules INSTALL_HDR_PATH=$(INSTALL_HDR_PATH) \
 		ARCH=$(ARCH) -C $(top_srcdir) headers_install
 endif
 
-- 
2.20.1