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, 2 insertions, 2 deletions

diff --git a/Source/cmVSSetupHelper.cxx b/Source/cmVSSetupHelper.cxx
index 20f5e2f..707ceac 100644
--- a/Source/cmVSSetupHelper.cxx
+++ b/Source/cmVSSetupHelper.cxx
@@ -365,8 +365,8 @@ bool cmVSSetupAPIHelper::EnumerateAndChooseVSInstance()
         // We are not looking for a specific instance.
         // If we've been given a hint then use it.
         if (!envVSCommonToolsDir.empty()) {
-          std::string currentVSLocation = instanceInfo.GetInstallLocation();
-          currentVSLocation += "/Common7/Tools";
+          std::string currentVSLocation =
+            cmStrCat(instanceInfo.GetInstallLocation(), "/Common7/Tools");
           if (cmSystemTools::ComparePath(currentVSLocation,
                                          envVSCommonToolsDir)) {
             chosenInstanceInfo = instanceInfo;