ASan builds are currently broken (likely fallout from the recent Clang update): Executing /builds/slave/m-cen-l64-dbg-asan-00000000000/build/obj-firefox/dist/bin/xpcshell -g /builds/slave/m-cen-l64-dbg-asan-00000000000/build/obj-firefox/dist/bin/ -a /builds/slave/m-cen-l64-dbg-asan-00000000000/build/obj-firefox/dist/bin/ -f /builds/slave/m-cen-l64-dbg-asan-00000000000/build/toolkit/mozapps/installer/precompile_cache.js -e precompile_startupcache("resource://gre/"); /builds/slave/m-cen-l64-dbg-asan-00000000000/build/obj-firefox/dist/bin/xpcshell: /usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.15' not found (required by /builds/slave/m-cen-l64-dbg-asan-00000000000/build/obj-firefox/dist/bin/libxul.so) /builds/slave/m-cen-l64-dbg-asan-00000000000/build/obj-firefox/dist/bin/xpcshell: /usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by /builds/slave/m-cen-l64-dbg-asan-00000000000/build/obj-firefox/dist/bin/libxul.so) Traceback (most recent call last): File "/builds/slave/m-cen-l64-dbg-asan-00000000000/build/toolkit/mozapps/installer/packager.py", line 375, in <module> main() File "/builds/slave/m-cen-l64-dbg-asan-00000000000/build/toolkit/mozapps/installer/packager.py", line 367, in main args.source, gre_path, base) File "/builds/slave/m-cen-l64-dbg-asan-00000000000/build/toolkit/mozapps/installer/packager.py", line 148, in precompile_cache errors.fatal('Error while running startup cache precompilation') File "/builds/slave/m-cen-l64-dbg-asan-00000000000/build/python/mozbuild/mozpack/errors.py", line 101, in fatal self._handle(self.FATAL, msg) File "/builds/slave/m-cen-l64-dbg-asan-00000000000/build/python/mozbuild/mozpack/errors.py", line 96, in _handle raise ErrorMessage(msg) mozpack.errors.ErrorMessage: Error: Error while running startup cache precompilation make[3]: *** [stage-package] Error 1 make[2]: make[3]: Leaving directory `/builds/slave/m-cen-l64-dbg-asan-00000000000/build/obj-firefox/browser/installer' make[2]: Leaving directory `/builds/slave/m-cen-l64-dbg-asan-00000000000/build/obj-firefox/browser/installer' *** [make-package] Error 2 make[1]: *** [default] Error 2 make: *** [package] Error 2 Rafael Espindola pointed out that this is likely due to additional symbols required in build/unix/stdc++compat/stdc++compat.cpp. I'll try to figure out which ones are missing there and add them.

On a local build I see these: $ readelf -W --dyn-syms libxul.so | egrep 'GLIBCXX_3.4.1(4|5)' | awk '{print $(NF-1)}' _ZNSsC1EOSs@GLIBCXX_3.4.14 _ZNSsaSEOSs@GLIBCXX_3.4.14 _ZNSt8__detail15_List_node_base4swapERS0_S1_@GLIBCXX_3.4.15 _ZNSt8__detail15_List_node_base7_M_hookEPS0_@GLIBCXX_3.4.15 _ZNSbIwSt11char_traitsIwESaIwEEaSEOS2_@GLIBCXX_3.4.14 _ZNSt8__detail15_List_node_base9_M_unhookEv@GLIBCXX_3.4.15 _ZNSbIwSt11char_traitsIwESaIwEEC1EOS2_@GLIBCXX_3.4.14 _ZNSbIwSt11char_traitsIwESaIwEE18_S_construct_aux_2EmwRKS1_@GLIBCXX_3.4.14 _ZNSbIwSt11char_traitsIwESaIwEE6assignEOS2_@GLIBCXX_3.4.14 _ZNSs18_S_construct_aux_2EmcRKSaIcE@GLIBCXX_3.4.14 _ZNSt8__detail15_List_node_base11_M_transferEPS0_S1_@GLIBCXX_3.4.15

Last comment isn't right, that local build was built without stdcxx-compat. With the new build, I'm not seeing any symbols in there depending on GLIBCXX_3.4.14 or 15. Will check further.

Nice, bug 895248 removed --enable-stdcxx-compat from the ASan mozconfigs, but didn't add it anywhere else for those configs. I'll add it to mozconfig.asan to unbreak the builds for now.

Add --enable-stdcxx-compat back to mozconfig.asan to unbreak builds. r=bustage-fix.