Switch powerpc clang to -msvr4-struct-return, like gcc.

Add these options from gcc to clang:
  -maix-struct-return   # return all structs in memory
  -msvr4-struct-return  # return small structs in r3/r4

ok mortimer@ jca@ deraadt@

1 files changed, 10 insertions, 3 deletions

diff --git a/gnu/llvm/tools/clang/lib/Frontend/CompilerInvocation.cpp b/gnu/llvm/tools/clang/lib/Frontend/CompilerInvocation.cpp
index a7c9b352584..4509e4ff35a 100644
--- a/gnu/llvm/tools/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/gnu/llvm/tools/clang/lib/Frontend/CompilerInvocation.cpp
@@ -1199,11 +1199,18 @@ static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
   }
 
-  if (Arg *A = Args.getLastArg(OPT_fpcc_struct_return, OPT_freg_struct_return)) {
-    if (A->getOption().matches(OPT_fpcc_struct_return)) {
+  // X86_32 has -fppc-struct-return and -freg-struct-return.
+  // PPC32 has -maix-struct-return and -msvr4-struct-return.
+  if (Arg *A =
+          Args.getLastArg(OPT_fpcc_struct_return, OPT_freg_struct_return,
+                          OPT_maix_struct_return, OPT_msvr4_struct_return)) {
+    const Option &O = A->getOption();
+    if (O.matches(OPT_fpcc_struct_return) ||
+        O.matches(OPT_maix_struct_return)) {
       Opts.setStructReturnConvention(CodeGenOptions::SRCK_OnStack);
     } else {
-      assert(A->getOption().matches(OPT_freg_struct_return));
+      assert(O.matches(OPT_freg_struct_return) ||
+             O.matches(OPT_msvr4_struct_return));
       Opts.setStructReturnConvention(CodeGenOptions::SRCK_InRegs);
     }
   }