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/cmFindPathCommand.cxx b/Source/cmFindPathCommand.cxx
index ea26410..38ff2ed 100644
--- a/Source/cmFindPathCommand.cxx
+++ b/Source/cmFindPathCommand.cxx
@@ -94,7 +94,7 @@ std::string cmFindPathCommand::FindHeaderInFramework(std::string const& file,
       std::string intPath = fpath;
       intPath += "/Headers/";
       intPath += fileName;
-      if (cmSystemTools::FileExists(intPath.c_str())) {
+      if (cmSystemTools::FileExists(intPath)) {
         if (this->IncludeFileInPath) {
           return intPath;
         }
@@ -128,7 +128,7 @@ std::string cmFindPathCommand::FindNormalHeader()
     for (std::string const& sp : this->SearchPaths) {
       tryPath = sp;
       tryPath += n;
-      if (cmSystemTools::FileExists(tryPath.c_str())) {
+      if (cmSystemTools::FileExists(tryPath)) {
         if (this->IncludeFileInPath) {
           return tryPath;
         }