Driver: Explicitly ignore -fpch-preprocess when using clang, we don't

need to do anything special to support this.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@68403 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 17 insertions, 0 deletions

diff --git a/lib/Driver/ArgList.cpp b/lib/Driver/ArgList.cpp
index 6d19f1acc5..69cb85b7fc 100644
--- a/lib/Driver/ArgList.cpp
+++ b/lib/Driver/ArgList.cpp
@@ -140,6 +140,15 @@ void ArgList::AddAllArgsTranslated(ArgStringList &Output, options::ID Id0,
   }
 }
 
+void ArgList::ClaimAllArgs(options::ID Id0) const {
+  // FIXME: Make fast.
+  for (const_iterator it = begin(), ie = end(); it != ie; ++it) {
+    const Arg *A = *it;
+    if (A->getOption().matches(Id0))
+      A->claim();
+  }
+}
+
 //
 
 InputArgList::InputArgList(const char **ArgBegin, const char **ArgEnd) 
diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index 16677439e9..70daaf5a62 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -415,6 +415,14 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
     Args.MakeArgString(getToolChain().GetProgramPath(C, "clang-cc").c_str());
   Dest.addCommand(new Command(Exec, CmdArgs));
 
+  // Claim some arguments which clang supports automatically.
+
+  // -fpch-preprocess is used with gcc to add a special marker in the
+  // -output to include the PCH file. Clang's PTH solution is
+  // -completely transparent, so we do not need to deal with it at
+  // -all.
+  Args.ClaimAllArgs(options::OPT_fpch_preprocess);
+  
   // Claim some arguments which clang doesn't support, but we don't
   // care to warn the user about.