[clang] Support __float128 on DragonFlyBSD.

[mgorny]

clang/lib/Basic/Targets/OSTargets.h

182

Maybe I'm missing something but do you actually need to state this-> explicitly?

[fcambus]

clang/lib/Basic/Targets/OSTargets.h

182

Seems like it is necessary, yes. Other targets (Haiku, Linux, OpenBSD, Solaris) use the same if (this->HasFloat128) check, and build fails if I remove the this-> part.

[mgorny]

Ok then.

clang/lib/Basic/Targets/OSTargets.h

void getOSDefines(const LangOptions &Opts, const llvm::Triple &Triple,
                     MacroBuilder &Builder) const override {
     // DragonFly defines; list based off of gcc output
     Builder.defineMacro("__DragonFly__");
     Builder.defineMacro("__DragonFly_cc_version", "100001");
     Builder.defineMacro("__ELF__");
     Builder.defineMacro("__KPRINTF_ATTRIBUTE__");
     Builder.defineMacro("__tune_i386__");
     DefineStd(Builder, "unix", Opts);
+    if (this->HasFloat128)
+      Builder.defineMacro("__FLOAT128__");
   }
 
 public:
   DragonFlyBSDTargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts)
       : OSTargetInfo<Target>(Triple, Opts) {
     switch (Triple.getArch()) {
     default:
     case llvm::Triple::x86:
     case llvm::Triple::x86_64:
+      this->HasFloat128 = true;
       this->MCountName = ".mcount";
       break;
     }
   }
 };
 
 #ifndef FREEBSD_CC_VERSION
 #define FREEBSD_CC_VERSION 0U