selftests/openat2: fix clang build failures: -static-libasan, LOCAL_HDRS

When building with clang via:

make LLVM=1 -C tools/testing/selftests

two distinct failures occur:

1) gcc requires -sta

selftests/openat2: fix clang build failures: -static-libasan, LOCAL_HDRS

When building with clang via:

make LLVM=1 -C tools/testing/selftests

two distinct failures occur:

1) gcc requires -static-libasan in order to ensure that Address
Sanitizer's library is the first one loaded. However, this leads to
build failures on clang, when building via:

make LLVM=1 -C tools/testing/selftests

However, clang already does the right thing by default: it statically
links the Address Sanitizer if -fsanitize is specified. Therefore, fix
this by simply omitting -static-libasan for clang builds. And leave
behind a comment, because the whole reason for static linking might not
be obvious.

2) clang won't accept invocations of this form, but gcc will:

$(CC) file1.c header2.h

Fix this by using selftests/lib.mk facilities for tracking local header
file dependencies: add them to LOCAL_HDRS, leaving only the .c files to
be passed to the compiler.

Reviewed-by: Ryan Roberts <[email protected]>
Signed-off-by: John Hubbard <[email protected]>
Reviewed-by: Nathan Chancellor <[email protected]>
Reviewed-by: Nathan Chancellor <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>

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selftests/openat2: Fix build warnings on ppc64

Fix warnings like:

openat2_test.c: In function ‘test_openat2_flags’:
openat2_test.c:303:73: warning: format ‘%llX’ expects argument of type
‘lon

selftests/openat2: Fix build warnings on ppc64

Fix warnings like:

openat2_test.c: In function ‘test_openat2_flags’:
openat2_test.c:303:73: warning: format ‘%llX’ expects argument of type
‘long long unsigned int’, but argument 5 has type ‘__u64’ {aka ‘long
unsigned int’} [-Wformat=]

By switching to unsigned long long for u64 for ppc64 builds.

Signed-off-by: Michael Ellerman <[email protected]>
Reviewed-by: Muhammad Usama Anjum <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>

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