commit ed469d82a0385309cd933608a957ad3d3e6a9093
author Eric <ewild@sysmocom.de> Mon May 15 17:02:04 2023 +0200
committer Eric Wild <ewild@sysmocom.de> Mon May 15 17:06:08 2023 +0200
tree 2226ed1e47e313eccdbb424141a9773fe06853a9
parent e00ac3b227d586296e4e043ae9b6500fde0e539f

configure.ac: fix libtool issue  with clang and sanitizer

[this fix already exists in most of the other repos]

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: I13fa39e440b5e7d2231454c6f3a1de55e6025399