diff options
| -rw-r--r-- | tools/llc/llc.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/tools/llc/llc.cpp b/tools/llc/llc.cpp index bb49d32a4a..439c22f9d8 100644 --- a/tools/llc/llc.cpp +++ b/tools/llc/llc.cpp @@ -58,7 +58,7 @@ static cl::opt<bool> Force("f", cl::desc("Overwrite output files")); // Determine optimization level. Level -O0 is equivalent to "fast" code gen. static cl::opt<char> OptLevel("O", - cl::desc("Optimization level. Similar to llvm-gcc -O."), + cl::desc("Optimization level. [-O0, -O1, -O2, -Os, or -O3]"), cl::Prefix, cl::ZeroOrMore, cl::init(' ')); @@ -257,6 +257,8 @@ int main(int argc, char **argv) { switch (OptLevel) { default: + std::cerr << argv[0] << ": invalid optimization level.\n"; + return 1; case ' ': break; case '0': OLvl = CodeGenOpt::None; break; case '1': OLvl = CodeGenOpt::One; break; |