> r194221 It breaks bootstrap on x86_64-apple-darwin10:
/opt/gcc/build_a/./gcc/xg++ -B/opt/gcc/build_a/./gcc/ -nostdinc++ -nostdinc++ -I/opt/gcc/build_a/x86_64-apple-darwin10.8.0/libstdc++-v3/include/x86_64-apple-darwin10.8.0 -I/opt/gcc/build_a/x86_64-apple-darwin10.8.0/libstdc++-v3/include -I/opt/gcc/_clean/libstdc++-v3/libsupc++ -I/opt/gcc/_clean/libstdc++-v3/include/backward -I/opt/gcc/_clean/libstdc++-v3/testsuite/util -L/opt/gcc/build_a/x86_64-apple-darwin10.8.0/libstdc++-v3/src -L/opt/gcc/build_a/x86_64-apple-darwin10.8.0/libstdc++-v3/src/.libs -B/opt/gcc/gcc4.8a/x86_64-apple-darwin10.8.0/bin/ -B/opt/gcc/gcc4.8a/x86_64-apple-darwin10.8.0/lib/ -isystem /opt/gcc/gcc4.8a/x86_64-apple-darwin10.8.0/include -isystem /opt/gcc/gcc4.8a/x86_64-apple-darwin10.8.0/sys-include -D_GNU_SOURCE -D_DEBUG -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -DASAN_HAS_EXCEPTIONS=1 -DASAN_FLEXIBLE_MAPPING_AND_OFFSET=0 -DASAN_NEEDS_SEGV=1 -DMAC_INTERPOSE_FUNCTIONS -DMISSING_BLOCKS_SUPPORT -I. -I../../../../_clean/libsanitizer/asan -I ../../../../_clean/libsanitizer/include -I ../../../../_clean/libsanitizer -Wall -W -Wno-unused-parameter -Wwrite-strings -pedantic -Wno-long-long -fPIC -fno-builtin -fno-exceptions -fomit-frame-pointer -funwind-tables -fvisibility=hidden -Wno-variadic-macros -Wno-c99-extensions -g -O2 -MT asan_interceptors.lo -MD -MP -MF .deps/asan_interceptors.Tpo -c ../../../../_clean/libsanitizer/asan/asan_interceptors.cc -fno-common -DPIC -o .libs/asan_interceptors.o ../../../../_clean/libsanitizer/asan/asan_interceptors.cc: In function 'void wrap___cxa_throw(void*, void*, void*)': ../../../../_clean/libsanitizer/asan/asan_interceptors.cc:181:10: error: '__interceptor___cxa_throw' was not declared in this scope __interceptor___cxa_throw, REAL(__cxa_throw), __cxa_throw); ^ At global scope: cc1plus: warning: unrecognized command line option "-Wno-c99-extensions" [enabled by default] Commenting the lines Printf("__asan's __cxa_throw %p; REAL(__cxa_throw) %p PLAIN %p\n", __interceptor___cxa_throw, REAL(__cxa_throw), __cxa_throw); in libsanitizer/asan/asan_interceptors.cc, allows boostrap to complete. TIA Dominique