[vcpkg/scripts] Teach vcpkg_add_to_path to only add the path if it is not already there

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[vcpkg/scripts] Teach vcpkg_add_to_path to only add the path if it is not already there #38296

Open Neumann-A opened 4 months ago

Neumann-A commented 4 months ago

vcpkg_add_to_path should only add a path to PATH if it is not already present on PATH. Furthermore there should be some special treatment of the PREPEND/APPEND in the case if the path is already in PATH.

dg0yt commented 4 months ago

Related: https://github.com/microsoft/vcpkg/pull/30396. vcpkg_host_path_list(REMOVE_DUPLICATES listvar) would remove duplicate regardless of whether they were created by vcpkg_add_to_path or by user script code.