diff options
Diffstat (limited to 'clang/lib/Driver/Tools.cpp')
| -rw-r--r-- | clang/lib/Driver/Tools.cpp | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp index 78672b2544f..e7c6f22c95d 100644 --- a/clang/lib/Driver/Tools.cpp +++ b/clang/lib/Driver/Tools.cpp @@ -4238,8 +4238,16 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA, if (JA.getType() == types::TY_LLVM_BC) CmdArgs.push_back("-emit-llvm-uselists"); - if (D.isUsingLTO()) + if (D.isUsingLTO()) { Args.AddLastArg(CmdArgs, options::OPT_flto, options::OPT_flto_EQ); + + // The Darwin linker currently uses the legacy LTO API, which does not + // support LTO unit features (CFI, whole program vtable opt) under + // ThinLTO. + if (!getToolChain().getTriple().isOSDarwin() || + D.getLTOMode() == LTOK_Full) + CmdArgs.push_back("-flto-unit"); + } } if (const Arg *A = Args.getLastArg(options::OPT_fthinlto_index_EQ)) { |
