Improve llvm-gcc compatibility, -Os implies -O2 (sortof).
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@58374 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Driver/clang.cpp b/Driver/clang.cpp
index 696e884..84eb341 100644
--- a/Driver/clang.cpp
+++ b/Driver/clang.cpp
@@ -1140,8 +1140,14 @@
llvm::cl::init(0));
static void InitializeCompileOptions(CompileOptions &Opts) {
- Opts.OptimizationLevel = OptLevel;
Opts.OptimizeSize = OptSize;
+ if (OptSize) {
+ // -Os implies -O2
+ // FIXME: Diagnose conflicting options.
+ Opts.OptimizationLevel = 2;
+ } else {
+ Opts.OptimizationLevel = OptLevel;
+ }
// FIXME: There are llvm-gcc options to control these selectively.
Opts.InlineFunctions = (Opts.OptimizationLevel > 1);