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Add support for clang Memory Sanitizer [1], which detects the usage of
uninitialized values. While elfutils itself is already checked with
valgrind, checking code that depends on elfutils requires elfutils to
be built with MSan.
MSan is not linked into shared libraries, and is linked into
executables statically. Therefore, unlike the other sanitizers, MSan
needs to be configured fairly early, since we need to drop
-D_FORTIFY_SOURCE [2], -Wl,-z,defs and --no-undefined.
Disable a few tests that run for more than 5 minutes due to test files
being statically linked with MSan.
[1] https://clang.llvm.org/docs/MemorySanitizer.html
[2] https://github.com/google/sanitizers/issues/247
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
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The varlocs test relies on finding addresses for the CUs, even in
object files. This might not be true (for example when building with
gcc -flto, which only emits partial, type only, debuginfo). Split
running the self tests in running on executables and shared libraries
as normal, but run object files with --exprlocs to test that output
too (and not require addresses).
Signed-off-by: Mark Wielaard <mark@klomp.org>
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