Driver: Handle -flto, -O4, and tweak -emit-llvm to match llvm-gcc.
- -emit-llvm no longer changes what compilation steps are done.
- -emit-llvm and -emit-llvm -S write output files with .o and .s
suffixes, respectively.
- <rdar://problem/6714125> clang-driver should support -O4 and -flto,
like llvm-gcc
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@67645 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index bc5a7cf..afb02fa 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -278,9 +278,12 @@
A->render(Args, CmdArgs);
}
- // Manually translate -O to -O1; let clang reject others.
- if (Arg *A = Args.getLastArg(options::OPT_O)) {
- if (A->getValue(Args)[0] == '\0')
+ // Manually translate -O to -O1 and -O4 to -O3; let clang reject
+ // others.
+ if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
+ if (A->getOption().getId() == options::OPT_O4)
+ CmdArgs.push_back("-O3");
+ else if (A->getValue(Args)[0] == '\0')
CmdArgs.push_back("-O1");
else
A->render(Args, CmdArgs);