Driver: For clang, accept -fsigned-bitfields and reject

-funsigned-bitfields for now (clang defaults to -fsigned-bitfields).
 - <rdar://problem/6790309> ER: Support
   -fsigned-bitfields/-funsigned-bitfields


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@69131 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 9 insertions, 0 deletions

diff --git a/include/clang/Driver/Options.def b/include/clang/Driver/Options.def
index a9074e88f0..1083794414 100644
--- a/include/clang/Driver/Options.def
+++ b/include/clang/Driver/Options.def
@@ -498,6 +498,7 @@ OPTION("-fprint-source-range-info", fprint_source_range_info, Flag, f_Group, INV
 OPTION("-fprofile-arcs", fprofile_arcs, Flag, f_Group, INVALID, "", 0, 0, 0)
 OPTION("-fprofile-generate", fprofile_generate, Flag, f_Group, INVALID, "", 0, 0, 0)
 OPTION("-framework", framework, Separate, INVALID, INVALID, "l", 0, 0, 0)
+OPTION("-fsigned-bitfields", fsigned_bitfields, Flag, f_Group, INVALID, "", 0, 0, 0)
 OPTION("-fstack-protector", fstack_protector, Flag, clang_ignored_f_Group, INVALID, "", 0, 0, 0)
 OPTION("-fstrict-aliasing", fstrict_aliasing, Flag, clang_ignored_f_Group, INVALID, "", 0, 0, 0)
 OPTION("-fsyntax-only", fsyntax_only, Flag, INVALID, INVALID, "d", 0, 0, 0)
@@ -506,6 +507,7 @@ OPTION("-fterminated-vtables", fterminated_vtables, Flag, f_Group, INVALID, "",
 OPTION("-ftime-report", ftime_report, Flag, f_Group, INVALID, "", 0, 0, 0)
 OPTION("-ftraditional", ftraditional, Flag, f_Group, INVALID, "", 0, 0, 0)
 OPTION("-ftrapv", ftrapv, Flag, f_Group, INVALID, "", 0, 0, 0)
+OPTION("-funsigned-bitfields", funsigned_bitfields, Flag, f_Group, INVALID, "", 0, 0, 0)
 OPTION("-funwind-tables", funwind_tables, Flag, f_Group, INVALID, "", 0, 0, 0)
 OPTION("-fverbose-asm", fverbose_asm, Flag, f_Group, INVALID, "", 0, 0, 0)
 OPTION("-fvisibility=", fvisibility_EQ, Joined, f_Group, INVALID, "", 0, 0, 0)
diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index 7c73780036..c266cc2172 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -473,6 +473,13 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
   if (!Args.hasFlag(options::OPT_fcommon, options::OPT_fno_common))
     CmdArgs.push_back("-fno-common");
 
+  // -fsigned-bitfields is default, and clang doesn't yet support
+  // --funsigned-bitfields.
+  if (!Args.hasFlag(options::OPT_fsigned_bitfields, 
+                    options::OPT_funsigned_bitfields))
+    D.Diag(clang::diag::warn_drv_clang_unsupported)
+      << Args.getLastArg(options::OPT_funsigned_bitfields)->getAsString(Args);
+
   Args.AddLastArg(CmdArgs, options::OPT_dM);
   Args.AddLastArg(CmdArgs, options::OPT_dD);