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Brad King authored
Copy the value to our `ConfigName` member on construction to ensure it is available even to code paths that run before `Generate`. We once needed to delay this lookup until `Generate` because the local generators were at one time created before `Configure`. Now they are created at generate time which is late enough to expect `CMAKE_BUILD_TYPE` to be available. Without this, `cmGlobalUnixMakefileGenerator3::WriteConvenienceRules` causes use of `ConfigName` before it is populated which breaks use of source files that depend on the `$<CONFIG>` generator expression. Fixes: #16889
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