[cfe-dev] an odd bug in CommonOptionsParser

[VinsonL]

I am a new learner in Clang and meet an odd bug.

My code is a simple case:
===================================================
.....
static llvm::cl::OptionCategory MyToolCategory("");
.....
int main(int argc, const char **argv)
{
  CommonOptionsParser OptionsParser(argc, argv, MyToolCategory);
  ClangTool Tool(OptionsParser.getCompilations(),
                 OptionsParser.getSourcePathList());
  tooling::MyFactory Factory;
  Tool.run(newFrontendActionFactory(&Factory));
  return 0;
}
==================================================

but it report an very odd error when compile with clang++(my llvm&clang's
version is 3.4):

==================================================
ToolingTutorial.cpp:74:23: error: no matching constructor for initialization
of 'clang::tooling::CommonOptionsParser'
  CommonOptionsParser OptionsParser(argc, argv, MyToolCategory);
                      ^             ~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/acsa-amd2/Documents/llvm-3.4/tools/clang/include/clang/Tooling/CommonOptionsParser.h:67:3:
note: candidate constructor not
      viable: no known conversion from 'llvm::cl::OptionCategory' to 'const
char *' for 3rd argument
  CommonOptionsParser(int &argc, const char **argv, const char *Overview =
0);
  ^
/home/acsa-amd2/Documents/llvm-3.4/tools/clang/include/clang/Tooling/CommonOptionsParser.h:61:7:
note: candidate constructor
      (the implicit move constructor) not viable: requires 1 argument, but 3
were provided
class CommonOptionsParser {
      ^
/home/acsa-amd2/Documents/llvm-3.4/tools/clang/include/clang/Tooling/CommonOptionsParser.h:61:7:
note: candidate constructor
      (the implicit copy constructor) not viable: requires 1 argument, but 3
were provided
1 error generated.
make: *** [ToolingTutorial.o] Error 1
==================================================

it makes no sense that the constructor is no match and the compiler mistake 
'llvm::cl::OptionCategory' for  'const char *' .



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