FindPkgConfig: format of PKG_CONFIG_PATH on msys2 and cygwin
In !2979 (closed) some explicit path conversion is proposed. I'd like to discuss the underlying use case and problematic behavior in an issue first, so I'm opening this for it.
From discussion in the MR:
When CMake reads
PKG_CONFIG_PATH
as an msys2/cygwin path it transforms it into a path that it can understand. I think in the# Prepare and set the environment variable
section above this patch. But then using pkg-config with that path will fail because it's not what it expects. Usingcygpath -up
ensures that thePKG_CONFIG_PATH
is both understood by CMake (Windows style but with forward slash) and with pkg-config (no backslash).
...
I think all environment pathes are converted to Windows pathes when run on Windows. This may or not be a general issue of cmake in msys2 but the pkg-config issue is the only one I got so far.
Before my patch the
PKG_CONFIG_PATH
isC:/Users/robux/Documents/Videolabs/work/contrib/x86_64-w64-mingw32/lib/pkgconfig
and after it becomes/c/Users/robux/Documents/Videolabs/work/contrib/x86_64-w64-mingw32/lib/pkgconfig
which is usable by pkg-config in msys2.
Cc: @robUx41