regehr@home:~$ echo > foo.c
regehr@home:~$ /home/regehr/z/checked-gcc-install/bin/gcc -c -O0 foo.c
CLANG ARITHMETIC UNDEFINED at </home/regehr/z/compiler-source/gcc/libcpp/files.c, (642:30)> : Op: <<, Reason : Signed Left Shift: left operand is negative || left operand is nonnegative, but the result can not be represented in the result signed type, BINARY OPERATION: left (int64): -1 right (int64): 63 
CLANG ARITHMETIC UNDEFINED at </home/regehr/z/compiler-source/gcc/gcc/expmed.c, (199:21)> : Op: <<, Reason : Signed Left Shift: left operand is negative || left operand is nonnegative, but the result can not be represented in the result signed type, BINARY OPERATION: left (int64): 1 right (int64): 63 
CLANG ARITHMETIC UNDEFINED at </home/regehr/z/compiler-source/gcc/gcc/stor-layout.c, (2554:34)> : Op: <<, Reason : Signed Left Shift: left operand is negative || left operand is nonnegative, but the result can not be represented in the result signed type, BINARY OPERATION: left (int64): -1 right (int64): 63 
CLANG ARITHMETIC UNDEFINED at </home/regehr/z/compiler-source/gcc/gcc/stor-layout.c, (2556:5)> : Op: <<, Reason : Signed Left Shift: left operand is negative || left operand is nonnegative, but the result can not be represented in the result signed type, BINARY OPERATION: left (int64): -1 right (int64): 0 
CLANG ARITHMETIC UNDEFINED at </home/regehr/z/compiler-source/gcc/gcc/stor-layout.c, (2563:32)> : Op: <<, Reason : Signed Left Shift: left operand is negative || left operand is nonnegative, but the result can not be represented in the result signed type, BINARY OPERATION: left (int64): 1 right (int64): 63 
CLANG ARITHMETIC UNDEFINED at </home/regehr/z/compiler-source/gcc/gcc/stor-layout.c, (2563:52)> : Op: -, Reason : Signed Subtraction Overflow, BINARY OPERATION: left (int64): -9223372036854775808 right (int64): 1 
CLANG ARITHMETIC UNDEFINED at </home/regehr/z/compiler-source/gcc/gcc/stor-layout.c, (2566:8)> : Op: <<, Reason : Signed Left Shift: left operand is negative || left operand is nonnegative, but the result can not be represented in the result signed type, BINARY OPERATION: left (int64): 1 right (int64): 63 
CLANG ARITHMETIC UNDEFINED at </home/regehr/z/compiler-source/gcc/gcc/stor-layout.c, (2566:54)> : Op: -, Reason : Signed Subtraction Overflow, BINARY OPERATION: left (int64): -9223372036854775808 right (int64): 1 
regehr@home:~$ /home/regehr/tmp/llvm-3.1.checked-install/bin/clang -c -O0 foo.c
CLANG ARITHMETIC UNDEFINED at </home/regehr/tmp/llvm-3.1.src/include/llvm/ADT/DenseMapInfo.h, (35:9)> : Op: <<=, Reason : Signed Left Shift: left operand is negative || left operand is nonnegative, but the result can not be represented in the result signed type, BINARY OPERATION: left (int64): -1 right (int64): 2 
CLANG ARITHMETIC UNDEFINED at </home/regehr/tmp/llvm-3.1.src/include/llvm/ADT/DenseMapInfo.h, (40:9)> : Op: <<=, Reason : Signed Left Shift: left operand is negative || left operand is nonnegative, but the result can not be represented in the result signed type, BINARY OPERATION: left (int64): -2 right (int64): 2 
CLANG ARITHMETIC UNDEFINED at </home/regehr/tmp/llvm-3.1.src/include/llvm/ADT/DenseMapInfo.h, (35:9)> : Op: <<=, Reason : Signed Left Shift: left operand is negative || left operand is nonnegative, but the result can not be represented in the result signed type, BINARY OPERATION: left (int64): -1 right (int64): 2 
CLANG ARITHMETIC UNDEFINED at </home/regehr/tmp/llvm-3.1.src/include/llvm/ADT/DenseMapInfo.h, (40:9)> : Op: <<=, Reason : Signed Left Shift: left operand is negative || left operand is nonnegative, but the result can not be represented in the result signed type, BINARY OPERATION: left (int64): -2 right (int64): 2