Add a definition for __STRUCT_PARM_ALIGN__ for elfv2 and 64-bit darwin platforms to match what other compilers produce.

llvm-svn: 295156

clang/lib/Basic/Targets.cpp

@@ -1232,6 +1232,11 @@ void PPCTargetInfo::getTargetDefines(const LangOptions &Opts,
   if (LongDoubleWidth == 128)
     Builder.defineMacro("__LONG_DOUBLE_128__");
 
+  // Define this for elfv2 (64-bit only) or 64-bit darwin.
+  if (ABI == "elfv2" ||
+      (getTriple().getOS() == llvm::Triple::Darwin && PointerWidth == 64))
+    Builder.defineMacro("__STRUCT_PARM_ALIGN__", "16");
+
   if (Opts.AltiVec) {
     Builder.defineMacro("__VEC__", "10206");
     Builder.defineMacro("__ALTIVEC__");

clang/test/Preprocessor/init.c

@@ -5635,6 +5635,7 @@
 // PPC64LE:#define __SIZE_MAX__ 18446744073709551615UL
 // PPC64LE:#define __SIZE_TYPE__ long unsigned int
 // PPC64LE:#define __SIZE_WIDTH__ 64
+// PPC64LE:#define __STRUCT_PARM_ALIGN__ 16
 // PPC64LE:#define __UINT16_C_SUFFIX__
 // PPC64LE:#define __UINT16_MAX__ 65535
 // PPC64LE:#define __UINT16_TYPE__ unsigned short