bpf: Hook target feature "alu32" with LLVM

LLVM has supported a new target feature "alu32" which could be enabled or
disabled by "-mattr=[+|-]alu32" when using llc.

This patch link Clang with it, so it could be also done by passing related
options to Clang, for example:

  -Xclang -target-feature -Xclang +alu32

Signed-off-by: Jiong Wang <jiong.wang@netronome.com>
Reviewed-by: Yonghong Song <yhs@fb.com>
llvm-svn: 325996

1 files changed, 8 insertions, 1 deletions

diff --git a/clang/lib/Basic/Targets/BPF.h b/clang/lib/Basic/Targets/BPF.h
index 836e47554bc..36d2da4dbf3 100644
--- a/clang/lib/Basic/Targets/BPF.h
+++ b/clang/lib/Basic/Targets/BPF.h
@@ -46,7 +46,14 @@ public:
   void getTargetDefines(const LangOptions &Opts,
                         MacroBuilder &Builder) const override;
 
-  bool hasFeature(StringRef Feature) const override { return Feature == "bpf"; }
+  bool hasFeature(StringRef Feature) const override {
+    return Feature == "bpf" || Feature == "alu32";
+  }
+
+  void setFeatureEnabled(llvm::StringMap<bool> &Features, StringRef Name,
+                         bool Enabled) const override {
+    Features[Name] = Enabled;
+  }
 
   ArrayRef<Builtin::Info> getTargetBuiltins() const override { return None; }