Extended Description

$ llvm-as /dev/null -o t.bc
$ opt -analyze -print-cfg-only t.bc

/Volumes/Projects/cvs/llvm/include/llvm/PassManagers.h:229: failed assertion `0 && "Unable to
handle Pass that requires lower level Analysis pass"'
0 opt 0x0015039d
_ZN40_GLOBAL__N_Signals.cpp_00000000_D6FCAF0915PrintStackTraceEv + 35
1 opt 0x00150743
_ZN40_GLOBAL__N_Signals.cpp_00000000_D6FCAF0913SignalHandlerEi + 323
2 libSystem.B.dylib 0x91b201a1 _sigtramp + 55
3 ??? 0xffffffff 0x0 + 4294967295
4 libSystem.B.dylib 0x91b284d1 raise + 26
5 libSystem.B.dylib 0x91b4eb73 abort + 84
6 opt 0x001564ad lt_dlloader_find + 203
7 opt 0x002a2bb9
ZN4llvm13PMDataManager25addLowerLevelRequiredPassEPNS_4PassES2 + 55
8 opt 0x001202ef _ZN4llvm13PMDataManager3addEPNS_4PassEb + 823
9 opt 0x00120903
_ZN4llvm12FunctionPass17assignPassManagerERNS_7PMStackENS_15PassManagerTypeE + 505
10 opt 0x002abc9d _ZN4llvm15PassManagerImpl15addTopLevelPassEPNS_4PassE +
247
11 opt 0x0011df12 _ZN4llvm17PMTopLevelManager12schedulePassEPNS_4PassE +
332
12 opt 0x002a642f _ZN4llvm15PassManagerImpl3addEPNS_4PassE + 27
13 opt 0x0011df3e _ZN4llvm11PassManager3addEPNS_4PassE + 26
14 opt 0x0000354e main + 2174
15 opt 0x0000192c start + 252
16 opt 0x00001859 start + 41