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: I8ebd9c6d4efda41c7c8196f963d1f04d65160754
This commit is contained in:
Eric Wild 2020-04-10 22:10:13 +02:00 committed by Hoernchen
parent d1cd527541
commit 099c8340ed
1 changed files with 5 additions and 0 deletions

View File

@ -24,6 +24,11 @@ LT_INIT([pic-only disable-static])
AC_CONFIG_MACRO_DIR([m4])
dnl patching ${archive_cmds} to affect generation of file "libtool" to fix linking with clang
AS_CASE(["$LD"],[*clang*],
[AS_CASE(["${host_os}"],
[*linux*],[archive_cmds='$CC -shared $pic_flag $libobjs $deplibs $compiler_flags $wl-soname $wl$soname -o $lib'])])
dnl check for pkg-config
dnl * If pkg-config is missing, we get a "syntax error" for PKG_CHECK_MODULES.
dnl Instead, we want to say that pkg-config and pkg.m4 are missing.