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* [PATCH v2 2/4] selftests: Fix seccomp to support relocatable build (O=objdir)
@ 2020-03-05  0:36 Shuah Khan
  2020-03-05  2:20 ` Kees Cook
  0 siblings, 1 reply; 5+ messages in thread
From: Shuah Khan @ 2020-03-05  0:36 UTC (permalink / raw)
  To: shuah, keescook, luto, wad, daniel, kafai, yhs, andriin, gregkh, tglx
  Cc: Shuah Khan, khilman, mpe, linux-kselftest, linux-kernel, netdev, bpf

Fix seccomp relocatable builds. This is a simple fix to use the
right lib.mk variable TEST_CUSTOM_PROGS to continue to do custom
build to preserve dependency on kselftest_harness.h local header.
This change applies cutom rule to seccomp_bpf seccomp_benchmark
for a simpler logic. 

Uses $(OUTPUT) defined in lib.mk to handle build relocation.

The following use-cases work with this change:

In seccomp directory:
make all and make clean

From top level from main Makefile:
make kselftest-install O=objdir ARCH=arm64 HOSTCC=gcc \
 CROSS_COMPILE=aarch64-linux-gnu- TARGETS=seccomp

Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
---
 tools/testing/selftests/seccomp/Makefile | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/tools/testing/selftests/seccomp/Makefile b/tools/testing/selftests/seccomp/Makefile
index 1760b3e39730..355bcbc0394a 100644
--- a/tools/testing/selftests/seccomp/Makefile
+++ b/tools/testing/selftests/seccomp/Makefile
@@ -1,17 +1,16 @@
 # SPDX-License-Identifier: GPL-2.0
-all:
-
-include ../lib.mk
+CFLAGS += -Wl,-no-as-needed -Wall
+LDFLAGS += -lpthread
 
 .PHONY: all clean
 
-BINARIES := seccomp_bpf seccomp_benchmark
-CFLAGS += -Wl,-no-as-needed -Wall
+include ../lib.mk
+
+# OUTPUT set by lib.mk
+TEST_CUSTOM_PROGS := $(OUTPUT)/seccomp_bpf $(OUTPUT)/seccomp_benchmark
 
-seccomp_bpf: seccomp_bpf.c ../kselftest_harness.h
-	$(CC) $(CFLAGS) $(LDFLAGS) $< -lpthread -o $@
+$(TEST_CUSTOM_PROGS): ../kselftest_harness.h
 
-TEST_PROGS += $(BINARIES)
-EXTRA_CLEAN := $(BINARIES)
+all: $(TEST_CUSTOM_PROGS)
 
-all: $(BINARIES)
+EXTRA_CLEAN := $(TEST_CUSTOM_PROGS)
-- 
2.20.1


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2020-03-05  0:36 [PATCH v2 2/4] selftests: Fix seccomp to support relocatable build (O=objdir) Shuah Khan
2020-03-05  2:20 ` Kees Cook
2020-03-05 16:41   ` Shuah Khan
2020-03-05 17:42     ` Kees Cook
2020-03-10 23:11       ` Shuah Khan

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