diff options
| author |   jsg <jsg@openbsd.org> | 2017-06-06 09:40:24 +0000 |
|---|---|---|
| committer | jsg <jsg@openbsd.org> | 2017-06-06 09:40:24 +0000 |
| commit | 7b4a6572144bf7b3a2d98f06f0d85f1eb74d6bc8 (patch) | |
| tree | c51267c1f09bae079b691195e94ca99c1f34f4c2 /gnu/llvm/tools/clang/lib/Driver/Tools.cpp | |
| parent | Fix compression output stats broken in rev 1.201. Patch originally by (diff) | |
| download | wireguard-openbsd-7b4a6572144bf7b3a2d98f06f0d85f1eb74d6bc8.tar.xz wireguard-openbsd-7b4a6572144bf7b3a2d98f06f0d85f1eb74d6bc8.zip | |
Enable -fwrapv by default with clang to treat signed integer overflows
as defined. This is done to prevent dangerous optimisations which could
remove security critical overflow checks.
Base gcc has -fno-strict-overflow by default, with clang this is
identical to -fwrapv.
Prompted by naddy@ discovering a hang with a clang compiled i386 kernel
that was resolved with -fwrapv.
ok kettenis@ pascal@
Diffstat (limited to 'gnu/llvm/tools/clang/lib/Driver/Tools.cpp')
| -rw-r--r-- | gnu/llvm/tools/clang/lib/Driver/Tools.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/gnu/llvm/tools/clang/lib/Driver/Tools.cpp b/gnu/llvm/tools/clang/lib/Driver/Tools.cpp index bd736c822c9..5eeb81f3039 100644 --- a/gnu/llvm/tools/clang/lib/Driver/Tools.cpp +++ b/gnu/llvm/tools/clang/lib/Driver/Tools.cpp @@ -5466,7 +5466,8 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA, options::OPT_fno_strict_overflow)) { if (A->getOption().matches(options::OPT_fno_strict_overflow)) CmdArgs.push_back("-fwrapv"); - } + } else if (getToolChain().getTriple().isOSOpenBSD()) + CmdArgs.push_back("-fwrapv"); if (Arg *A = Args.getLastArg(options::OPT_freroll_loops, options::OPT_fno_reroll_loops)) |