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, 2 deletions

diff --git a/Source/cmSetTargetPropertiesCommand.cxx b/Source/cmSetTargetPropertiesCommand.cxx
index 1dc7e69..b4360e4 100644
--- a/Source/cmSetTargetPropertiesCommand.cxx
+++ b/Source/cmSetTargetPropertiesCommand.cxx
@@ -6,6 +6,7 @@
 
 #include "cmAlgorithms.h"
 #include "cmMakefile.h"
+#include "cmStringAlgorithms.h"
 #include "cmTarget.h"
 
 class cmExecutionStatus;
@@ -52,8 +53,8 @@ bool cmSetTargetPropertiesCommand::InitialPass(
     bool ret = cmSetTargetPropertiesCommand::SetOneTarget(
       args[i], propertyPairs, this->Makefile);
     if (!ret) {
-      std::string message = "Can not find target to add properties to: ";
-      message += args[i];
+      std::string message =
+        cmStrCat("Can not find target to add properties to: ", args[i]);
       this->SetError(message);
       return false;
     }