There are many failures in libmudflap in http://gcc.gnu.org/ml/gcc-testresults/2007-04/msg01222.html
=== libmudflap tests === Running target unix/-m32 FAIL: libmudflap.c++/pass41-frag.cxx execution test FAIL: libmudflap.c++/pass41-frag.cxx (-static) execution test FAIL: libmudflap.c++/pass41-frag.cxx ( -O) execution test FAIL: libmudflap.c++/pass41-frag.cxx (-O2) execution test FAIL: libmudflap.c++/pass41-frag.cxx (-O3) execution test === libmudflap Summary for unix/-m32 === # of expected passes 1821 # of unexpected failures 5 Running target unix FAIL: libmudflap.c/pass49-frag.c execution test FAIL: libmudflap.c/pass49-frag.c output pattern test FAIL: libmudflap.c/pass49-frag.c execution test FAIL: libmudflap.c/pass49-frag.c output pattern test FAIL: libmudflap.c/fail8-frag.c (-static) output pattern test FAIL: libmudflap.c/fail9-frag.c (-static) output pattern test FAIL: libmudflap.c/pass49-frag.c (-static) execution test FAIL: libmudflap.c/pass49-frag.c (-static) output pattern test FAIL: libmudflap.c/pass49-frag.c (-static) execution test FAIL: libmudflap.c/pass49-frag.c (-static) output pattern test FAIL: externs-12 execution FAIL: externs-21 execution FAIL: externs-12 execution -static FAIL: externs-21 execution -static FAIL: externs-12 execution -O2 FAIL: externs-21 execution -O2 FAIL: externs-12 execution -O3 FAIL: externs-21 execution -O3 FAIL: libmudflap.c++/pass41-frag.cxx execution test FAIL: libmudflap.c++/pass41-frag.cxx (-static) execution test FAIL: libmudflap.c++/pass41-frag.cxx ( -O) execution test FAIL: libmudflap.c++/pass41-frag.cxx (-O2) execution test FAIL: libmudflap.c++/pass41-frag.cxx (-O3) execution test === libmudflap Summary for unix === # of expected passes 1803 # of unexpected failures 23 === libmudflap Summary === # of expected passes 3624 # of unexpected failures 28 -- Summary: [4.3 regression]: Many libmudflap faulures Product: gcc Version: 4.3.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libmudflap AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: hjl at lucon dot org GCC target triplet: x86_64-unknown-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31681