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/cmUtilitySourceCommand.cxx b/Source/cmUtilitySourceCommand.cxx
index 0ce437c..1140800 100644
--- a/Source/cmUtilitySourceCommand.cxx
+++ b/Source/cmUtilitySourceCommand.cxx
@@ -66,14 +66,14 @@ bool cmUtilitySourceCommand::InitialPass(std::vector<std::string> const& args,
   utilitySource = utilitySource + "/" + relativeSource;
 
   // If the directory doesn't exist, the source has not been included.
-  if (!cmSystemTools::FileExists(utilitySource.c_str())) {
+  if (!cmSystemTools::FileExists(utilitySource)) {
     return true;
   }
 
   // Make sure all the files exist in the source directory.
   while (arg != args.end()) {
     std::string file = utilitySource + "/" + *arg++;
-    if (!cmSystemTools::FileExists(file.c_str())) {
+    if (!cmSystemTools::FileExists(file)) {
       return true;
     }
   }