[cmake-developers] ExternalProject: Use native paths as substitute for directory tokens

[Kislinskiy, Stefan]

Hi,

I would like to contribute a fix regarding directory tokens (e.g. <SOURCE_DIR>) in the ExternalProject module. These tokens are replaced by their matching target property value _EP_${dir}. However, the path substitutes are not converted to native path style which makes it impossible to use directory tokens in some Windows commands like pushd, as these commands are not able to handle forward slashes. I attached a tiny patch which simply calls file(TO_NATIVE_PATH) before replacing directory tokens.

Best regards,
Stefan Kislinskiy
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