I get the following ICE compiling Thunderbird with GCC 4.3. pinskia says it's related to PR31036 but that it's worth filing a separate bug.
(sid)2723:[EMAIL PROTECTED]: ~] /usr/lib/gcc-snapshot/bin/g++ -c -O1 -fno-exceptions -fcheck-new icedove-xpccomponents.ii xpccomponents.cpp: In member function 'nsresult nsXPCComponents_utils_Sandbox::CallOrConstruct(nsIXPConnectWrappedNative*, JSContext*, JSObject*, PRUint32, jsval*, jsval*, PRBool*)': xpccomponents.cpp:2407: error: definition in block 23 does not dominate use in block 32 for SSA_NAME: NMT.14386_417 in statement: NMT.14386_131 = PHI <NMT.14386_417(23), NMT.14386_283(D)(17), NMT.14386_283(D)(18), NMT.14386_417(32)> PHI argument NMT.14386_417 for PHI node NMT.14386_131 = PHI <NMT.14386_417(23), NMT.14386_283(D)(17), NMT.14386_283(D)(18), NMT.14386_417(32)> xpccomponents.cpp:2407: internal compiler error: verify_ssa failed Please submit a full bug report, -- Summary: [4.3 Regression] ICE: verify_ssa failed Product: gcc Version: 4.3.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: tbm at cyrius dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31037