Source sweep: Use cmStrCat for string concatenation

This patch is generated by a python script that uses regular expressions to
search for string concatenation patterns of the kind

```
std::string str = <ARG0>;
str += <ARG1>;
str += <ARG2>;
...
```

and replaces them with a single `cmStrCat` call

```
std::string str = cmStrCat(<ARG0>, <ARG1>, <ARG2>, ...);
```

If any `<ARGX>` is itself a concatenated string of the kind

```
a + b + c + ...;
```

then `<ARGX>` is split into multiple arguments for the `cmStrCat` call.

If there's a sequence of literals in the `<ARGX>`, then all literals in the
sequence are concatenated and merged into a single literal argument for
the `cmStrCat` call.

Single character strings are converted to single char arguments for
the `cmStrCat` call.

`std::to_string(...)` wrappings are removed from `cmStrCat` arguments,
because it supports numeric types as well as string types.

`arg.substr(x)` arguments to `cmStrCat` are replaced with
`cm::string_view(arg).substr(x)`

1 files changed, 3 insertions, 3 deletions

diff --git a/Source/cmVisualStudioGeneratorOptions.cxx b/Source/cmVisualStudioGeneratorOptions.cxx
index 6c28996..3e423e9 100644
--- a/Source/cmVisualStudioGeneratorOptions.cxx
+++ b/Source/cmVisualStudioGeneratorOptions.cxx
@@ -325,9 +325,9 @@ void cmVisualStudioGeneratorOptions::ParseFinish()
     //  "rtSingleThreadedDLL", "10", /libs:dll
     //  "rtSingleThreadedDebug", "5", /dbglibs /libs:static
     //  "rtSingleThreadedDebugDLL", "11", /dbglibs /libs:dll
-    std::string rl = "rtMultiThreaded";
-    rl += this->FortranRuntimeDebug ? "Debug" : "";
-    rl += this->FortranRuntimeDLL ? "DLL" : "";
+    std::string rl =
+      cmStrCat("rtMultiThreaded", this->FortranRuntimeDebug ? "Debug" : "",
+               this->FortranRuntimeDLL ? "DLL" : "");
     this->FlagMap["RuntimeLibrary"] = rl;
   }