[libclang] Add entry points that take a full command line including argv[0].

This provides both a more uniform interface and makes libclang behave like
clang tooling wrt relative paths against argv[0]. This is necessary for
finding paths to a c++ standard library relative to a clang binary given
in a compilation database. It can also be used to find paths relative to
libclang.so if the full path to it is passed in.

Differential Revision: http://reviews.llvm.org/D14695

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@253466 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 2 deletions

diff --git a/tools/diagtool/ShowEnabledWarnings.cpp b/tools/diagtool/ShowEnabledWarnings.cpp
index 06f74320b7..abbd3afbd5 100644
--- a/tools/diagtool/ShowEnabledWarnings.cpp
+++ b/tools/diagtool/ShowEnabledWarnings.cpp
@@ -64,9 +64,11 @@ createDiagnostics(unsigned int argc, char **argv) {
     new DiagnosticsEngine(DiagIDs, new DiagnosticOptions(), DiagsBuffer));
 
   // Try to build a CompilerInvocation.
+  SmallVector<const char *, 4> Args;
+  Args.push_back("diagtool");
+  Args.append(argv, argv + argc);
   std::unique_ptr<CompilerInvocation> Invocation(
-      createInvocationFromCommandLine(llvm::makeArrayRef(argv, argc),
-                                      InterimDiags));
+      createInvocationFromCommandLine(Args, InterimDiags));
   if (!Invocation)
     return nullptr;