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  • Stephen Kelly's avatar
    Introduce CMAKE_STAGING_PREFIX variable. · 7521da28
    Stephen Kelly authored
    This variable can be useful in cross-compiling contexts where the
    sysroot is read-only or where the sysroot should otherwise remain
    pristine.
    
    If the new CMAKE_STAGING_PREFIX variable is set, it is used instead
    of CMAKE_INSTALL_PREFIX when generating the installation rules in
    cmake_install.cmake.
    
    This way, the CMAKE_INSTALL_PREFIX variable
    always refers to the installation prefix on the target device, regardless
    of whether host==target.
    
    If any -rpath paths passed to the linker contain the CMAKE_STAGING_PREFIX,
    the matching path fragments are replaced with the CMAKE_INSTALL_PREFIX.
    Matching paths in the -rpath-link are not transformed.
    
    The cross-prefix usr-move workaround is assumed not to require extension
    regarding CMAKE_STAGING_PREFIX. The staging area is a single prefix, so
    there is no scope for cross-prefix symlinks. The CMAKE_INSTALL_PREFIX
    is still used to determine the workaround path, and that variable
    remains the relevant one even if CMAKE_STAGING_PREFIX is used. If the
    generated export files are deployed to the target, the workaround
    will still be in place, and still be employed if required.
    7521da28