Reduce raw string pointers usage.

* Change some functions to take `std::string` instead of
  `const char*` in the following classes: `cmMakeFile`, `cmake`,
  `cmCoreTryCompile`, `cmSystemTools`,  `cmState`, `cmLocalGenerator`
  and a few others.
* Greatly reduce using of `const char*` overloads for
  `cmSystemTools::MakeDirectory` and `cmSystemTools::RelativePath`.
* Remove many redundant `c_str()` conversions throughout the code.

1 files changed, 2 insertions, 2 deletions

diff --git a/Source/cmMakeDirectoryCommand.cxx b/Source/cmMakeDirectoryCommand.cxx
index 06e295bc04..aff4ca650f 100644
--- a/Source/cmMakeDirectoryCommand.cxx
+++ b/Source/cmMakeDirectoryCommand.cxx
@@ -15,13 +15,13 @@ bool cmMakeDirectoryCommand::InitialPass(std::vector<std::string> const& args,
     this->SetError("called with incorrect number of arguments");
     return false;
   }
-  if (!this->Makefile->CanIWriteThisFile(args[0].c_str())) {
+  if (!this->Makefile->CanIWriteThisFile(args[0])) {
     std::string e = "attempted to create a directory: " + args[0] +
       " into a source directory.";
     this->SetError(e);
     cmSystemTools::SetFatalErrorOccured();
     return false;
   }
-  cmSystemTools::MakeDirectory(args[0].c_str());
+  cmSystemTools::MakeDirectory(args[0]);
   return true;
 }