Pick up clang_rt static archives compiler internal libraries

Libtool checks only for libraries linked as -l* when trying to
find internal compiler libraries. Clang, however uses the absolute
path to link its internal libraries e.g. compiler_rt. This patch
handles clang's statically linked libraries when finding internal
compiler libraries.
https://crbug.com/749263
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=27866

diff --git a/m4/libtool.m4 b/m4/libtool.m4
index 4b4ea721a01cc5fcd4ac16aec488b712c3eedf9b..8e0a46bcb893c8f137fdf67bc8ae553b83a2bc07 100644 (file)
--- a/m4/libtool.m4
+++ b/m4/libtool.m4
@@ -7758,7 +7758,7 @@ if AC_TRY_EVAL(ac_compile); then
   for p in `eval "$output_verbose_link_cmd"`; do
     case $prev$p in
 
-    -L* | -R* | -l*)
+    -L* | -R* | -l* | */libclang_rt.*.a)
        # Some compilers place space between "-{L,R,l}" and the path.
        # Remove the space.
        if test x-L = x"$p" ||