tree 939fc1531958a3f423f0381f091e3c2897832190
parent cc971aa1a68343f883a134b864c5b0f7eb57d6be
author Eric <ewild@sysmocom.de> 1586560819 +0200
committer Hoernchen <ewild@sysmocom.de> 1586630022 +0000

configure.ac: fix libtool issue  with clang and sanitizer

As pointed out at https://github.com/libexpat/libexpat/issues/312
libtool does not play nice with clang sanitizer builds at all.
For those builds LD shoud be set to clang too (and LDFLAGS needs the
sanitizer flags as well), because the clang compiler driver knows how
linking to the sanitizer libs works, but then at a later stage libtool
fails to actually produce the shared libraries and the build fails. This
is fixed by this patch.

Addtionally LD_LIBRARY_PATH has no effect on conftest runs during
configure time, so the rpath needs to be set to the asan library path to
ensure the configure run does not fail due to a missing asan library,
i.e.:

SANS='-fsanitize=memory -fsanitize-recover=all -shared-libsan'
export CC=clang-10
ASANPATH=$(dirname `$CC -print-file-name=libclang_rt.asan-x86_64.so`)
export LDFLAGS="-Wl,-rpath,$ASANPATH $SANS $LDFLAGS"

Change-Id: If3d9465068b2c654b935fc3d9ab41d799d5e02e8