[clang][Driver] Define soft float macros for PPC.

Fixes #105972.

Co-authored-by: Qiu Chaofan <[email protected]>

Author: alexrp

clang/lib/Basic/Targets/PPC.cpp

@@ -402,9 +402,13 @@ void PPCTargetInfo::getTargetDefines(const LangOptions &Opts,
     Builder.defineMacro("__VEC__", "10206");
     Builder.defineMacro("__ALTIVEC__");
   }
-  if (HasSPE) {
+  if (HasSPE)
     Builder.defineMacro("__SPE__");
+  if (HasSPE || FloatABI == SoftFloat)
     Builder.defineMacro("__NO_FPRS__");
+  if (FloatABI == SoftFloat) {
+    Builder.defineMacro("_SOFT_FLOAT");
+    Builder.defineMacro("_SOFT_DOUBLE");
   }
   if (HasVSX)
     Builder.defineMacro("__VSX__");
@@ -439,14 +443,12 @@ void PPCTargetInfo::getTargetDefines(const LangOptions &Opts,
   // FIXME: The following are not yet generated here by Clang, but are
   //        generated by GCC:
   //
-  //   _SOFT_FLOAT_
   //   __RECIP_PRECISION__
   //   __APPLE_ALTIVEC__
   //   __RECIP__
   //   __RECIPF__
   //   __RSQRTE__
   //   __RSQRTEF__
-  //   _SOFT_DOUBLE_
   //   __NO_LWSYNC__
   //   __CMODEL_MEDIUM__
   //   __CMODEL_LARGE__

clang/test/Preprocessor/init-ppc.c

@@ -977,3 +977,9 @@
 
 // RUN: %clang_cc1 -E -dM -triple=powerpc-unknown-openbsd -x c++ < /dev/null | FileCheck -match-full-lines -check-prefix PPC-OPENBSD-CXX %s
 // PPC-OPENBSD-CXX: #define __STDCPP_DEFAULT_NEW_ALIGNMENT__ 16UL
+
+// RUN: %clang_cc1 -E -dM -ffreestanding -triple=powerpc-unknown-linux-gnu -target-feature -hard-float < /dev/null | FileCheck -match-full-lines -check-prefix PPC-SOFTFLT %s
+//
+// PPC-SOFTFLT:#define _SOFT_DOUBLE 1
+// PPC-SOFTFLT:#define _SOFT_FLOAT 1
+// PPC-SOFTFLT:#define __NO_FPRS__ 1

clang/test/Preprocessor/init-ppc64.c

@@ -1110,3 +1110,9 @@
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=powerpc64-unknown-freebsd < /dev/null | FileCheck -match-full-lines -check-prefix PPC64-FREEBSD %s
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=powerpc64le-unknown-freebsd < /dev/null | FileCheck -match-full-lines -check-prefix PPC64-FREEBSD %s
 // PPC64-FREEBSD-NOT: #define __LONG_DOUBLE_128__ 1
+
+// RUN: %clang_cc1 -E -dM -ffreestanding -triple=powerpc64-unknown-linux-gnu -target-feature -hard-float -xc /dev/null | FileCheck --check-prefix=PPC64-SOFTFLT %s
+// RUN: %clang_cc1 -E -dM -ffreestanding -triple=powerpc64le-unknown-linux-gnu -target-feature -hard-float -xc /dev/null | FileCheck --check-prefix=PPC64-SOFTFLT %s
+// PPC64-SOFTFLT:#define _SOFT_DOUBLE 1
+// PPC64-SOFTFLT:#define _SOFT_FLOAT 1
+// PPC64-SOFTFLT:#define __NO_FPRS__ 1