On 3/26/20 4:23 PM, Bird, Tim wrote:

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-----Original Message----- From: Shuah Khan

Fix memfd to support relocatable build (O=objdir). This calls out source files necessary to build tests and simplfies the dependency enforcement.

Tested the following:

Note that cross-build for fuse_mnt has dependency on -lfuse.

make all make clean make kselftest-install O=/arm64_build/ ARCH=arm64 HOSTCC=gcc \ CROSS_COMPILE=aarch64-linux-gnu- TARGETS=memfd

Signed-off-by: Shuah Khan skhan@linuxfoundation.org

tools/testing/selftests/memfd/Makefile | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/memfd/Makefile b/tools/testing/selftests/memfd/Makefile index 53a848109f7b..0a15f9e23431 100644 --- a/tools/testing/selftests/memfd/Makefile +++ b/tools/testing/selftests/memfd/Makefile @@ -4,9 +4,8 @@ CFLAGS += -I../../../../include/uapi/ CFLAGS += -I../../../../include/ CFLAGS += -I../../../../usr/include/

-TEST_GEN_PROGS := memfd_test +TEST_GEN_PROGS := memfd_test fuse_test fuse_mnt TEST_PROGS := run_fuse_test.sh run_hugetlbfs_test.sh -TEST_GEN_FILES := fuse_mnt fuse_test

fuse_mnt.o: CFLAGS += $(shell pkg-config fuse --cflags)

@@ -14,7 +13,7 @@ include ../lib.mk

$(OUTPUT)/fuse_mnt: LDLIBS += $(shell pkg-config fuse --libs)

Sorry to interject here. This comment doesn't have to do with this patch, but the above line is problematical for cross-compilation. $(shell pkg-config fuse --libs) will use pkg-config from the host machine, and may produce something different from what's installed on the target. For most enterprise and desktop systems library paths for are mostly standardized. The effect is that if you're doing 'simple' embedded, the pkg-config output on the host will match that of the target board. However, in some embedded products the partition and filesystem setups are often quite complicated (e.g. I recently worked on a TV set with 14 partitions) and things are not in the locations preferred by the Filesystem Hierarchy Standard.

When cross-compiling for our products, we tend to use the pkg-config from the filesystem of the target (a copy of which is on the host), rather than the host's pkg-config.

Thanks for bringing attention to the issue. This is an existing issue. Thankfully this is one of the two tests that use pkg-config.

The problem is limited to just two tests that are included in the Makefile TARGETS.

I don't have a board in my test lab where this shows up, nor a proposed solution at the moment, but I'm just mentioning it as a potential host-environment build contamination issue. Maybe I should start keeping a list, and start thinking of possible solutions for more of these types of issues.

Thanks for bringing attention to the issue. I will keep an eye out for this kind of usage during my reviews.

P.S. I'd ignore this issue for approving this patch. I'm just bringing it up as a red flag for future work.

Thanks. This is an existing problem that can be addressed in a separate page.

thanks, -- Shuah