[clang][ArgumentAdjusters] Do not add fsyntax-only if already exists

Reviewers: hokein

Subscribers: cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D64063

llvm-svn: 364904

1 files changed, 5 insertions, 1 deletions

diff --git a/clang/lib/Tooling/ArgumentsAdjusters.cpp b/clang/lib/Tooling/ArgumentsAdjusters.cpp
index 002c587d6bb..942b35df453 100644
--- a/clang/lib/Tooling/ArgumentsAdjusters.cpp
+++ b/clang/lib/Tooling/ArgumentsAdjusters.cpp
@@ -23,14 +23,18 @@ namespace tooling {
 ArgumentsAdjuster getClangSyntaxOnlyAdjuster() {
   return [](const CommandLineArguments &Args, StringRef /*unused*/) {
     CommandLineArguments AdjustedArgs;
+    bool HasSyntaxOnly = false;
     for (size_t i = 0, e = Args.size(); i < e; ++i) {
       StringRef Arg = Args[i];
       // FIXME: Remove options that generate output.
       if (!Arg.startswith("-fcolor-diagnostics") &&
           !Arg.startswith("-fdiagnostics-color"))
         AdjustedArgs.push_back(Args[i]);
+      if (Arg == "-fsyntax-only")
+        HasSyntaxOnly = true;
     }
-    AdjustedArgs.push_back("-fsyntax-only");
+    if (!HasSyntaxOnly)
+      AdjustedArgs.push_back("-fsyntax-only");
     return AdjustedArgs;
   };
 }