[RISCV] Mark TLS as supported

[lewis-revill]

Summary

Inform Clang that TLS is implemented by LLVM for RISC-V

[jrtc27]

lib/Basic/Targets/RISCV.h

39 ↗

(On Diff #182916)

With the exception of SystemZTargetInfo, all CPU target info classes rely on the base already initialising it to true by default, so you can just delete this line.

[lewis-revill]

Rely on default value rather than explicitly marking TLSSupported as true.

[asb]

Could you add a test for this? I'm not sure if this is best done with a test that uses __has_feature or otherwise (I note other targets don't seem to have similar tests currently), but I think it would be handy.

[lewis-revill]

Added RISC-V to thread specifier test as a means of checking TLS is supported.

[asb]

LGTM, thanks!

cfe/trunk/lib/Basic/Targets/RISCV.h

protected:
   bool HasF;
   bool HasD;
   bool HasC;
 
 public:
   RISCVTargetInfo(const llvm::Triple &Triple, const TargetOptions &)
       : TargetInfo(Triple), HasM(false), HasA(false), HasF(false),
         HasD(false), HasC(false) {
-    TLSSupported = false;
     LongDoubleWidth = 128;
     LongDoubleAlign = 128;
     LongDoubleFormat = &llvm::APFloat::IEEEquad();
     SuitableAlign = 128;
     WCharType = SignedInt;
     WIntType = UnsignedInt;
   }
 

cfe/trunk/test/CodeGen/thread-specifier.c

 // RUN: %clang_cc1 -triple i686-pc-linux-gnu -emit-llvm -o - %s | FileCheck %s
+// RUN: %clang_cc1 -triple riscv32 -emit-llvm -o - %s | FileCheck %s
+// RUN: %clang_cc1 -triple riscv64 -emit-llvm -o - %s | FileCheck %s
 
 // CHECK: @b = external thread_local global
 // CHECK: @d.e = internal thread_local global
 // CHECK: @d.f = internal thread_local global
 // CHECK: @f.a = internal thread_local(initialexec) global
 // CHECK: @a = thread_local global
 // CHECK: @g = thread_local global
 // CHECK: @h = thread_local(localdynamic) global