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Currently the export(...) cmake directive is scoped inside if (FMT_INSTALL):
https://github.com/fmtlib/fmt/blob/11ddbcb7898d2d3445d431a54814367b21dee6ad/CMakeLists.txt#L496-L499
However, there are cases in which downstream projects might not want to install fmt but might still want to provide a export(...) themselves. However, this is impossible to do when depending on another target that doesn't export itself. CMake will error with something like
CMake Error: export("MyLibTargets" ...) includes target "mylib" which requires target "fmt" that is not in any export set.
Since having the exported target files in the build tree don't harm anyone, I suggest just unconditionally exporting regardless of whether FMT_INSTALL is true or not.
See also e.g. https://github.com/Kistler-Group/sdbus-cpp/pull/523