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, 1 insertions, 2 deletions

diff --git a/Source/cmSourceFileLocation.cxx b/Source/cmSourceFileLocation.cxx
index 6e2e820..0e8d09d 100644
--- a/Source/cmSourceFileLocation.cxx
+++ b/Source/cmSourceFileLocation.cxx
@@ -110,8 +110,7 @@ void cmSourceFileLocation::UpdateExtension(const std::string& name)
       // Check the source tree only because a file in the build tree should
       // be specified by full path at least once.  We do not want this
       // detection to depend on whether the project has already been built.
-      tryPath = this->Makefile->GetCurrentSourceDirectory();
-      tryPath += "/";
+      tryPath = cmStrCat(this->Makefile->GetCurrentSourceDirectory(), '/');
     }
     if (!this->Directory.empty()) {
       tryPath += this->Directory;