Driver & AST: Implement support for -fpack-struct and -fpack-struct= command

line options.
 - <rdar://problem/10120602>, PR9631

llvm-svn: 141211

1 files changed, 12 insertions, 0 deletions

diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index e193c0f505a..1dcb8bc91de 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -2062,11 +2062,23 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
                    false))
     CmdArgs.push_back("-fpascal-strings");
 
+  // Honor -fpack-struct= and -fpack-struct, if given. Note that
+  // -fno-pack-struct doesn't apply to -fpack-struct=.
+  if (Arg *A = Args.getLastArg(options::OPT_fpack_struct_EQ)) {
+    CmdArgs.push_back("-fpack-struct");
+    CmdArgs.push_back(A->getValue(Args));
+  } else if (Args.hasFlag(options::OPT_fpack_struct,
+                          options::OPT_fno_pack_struct, false)) {
+    CmdArgs.push_back("-fpack-struct");
+    CmdArgs.push_back("1");
+  }
+
   if (Args.hasArg(options::OPT_mkernel) ||
       Args.hasArg(options::OPT_fapple_kext)) {
     if (!Args.hasArg(options::OPT_fcommon))
       CmdArgs.push_back("-fno-common");
   }
+
   // -fcommon is default, only pass non-default.
   else if (!Args.hasFlag(options::OPT_fcommon, options::OPT_fno_common))
     CmdArgs.push_back("-fno-common");