# Determines at `make install` time if a file, typically a configuration # file placed in $PREFIX/etc, shouldn't be installed to prevent overwrite # of an existing file. # # _srcfile: the file to install # _dstfile: the absolute file name after installation macro(InstallClobberImmune _srcfile _dstfile) install(CODE " set(_destfile \"${_dstfile}\") if (NOT \"\$ENV{DESTDIR}\" STREQUAL \"\") # prepend install root prefix with install-time DESTDIR set(_destfile \"\$ENV{DESTDIR}/${_dstfile}\") endif () if (EXISTS \${_destfile}) message(STATUS \"Skipping: \${_destfile} (already exists)\") execute_process(COMMAND \"${CMAKE_COMMAND}\" -E compare_files ${_srcfile} \${_destfile} RESULT_VARIABLE _diff) if (NOT \"\${_diff}\" STREQUAL \"0\") message(STATUS \"Installing: \${_destfile}.example\") configure_file(${_srcfile} \${_destfile}.example COPYONLY) endif () else () message(STATUS \"Installing: \${_destfile}\") # install() is not scriptable within install(), and # configure_file() is the next best thing configure_file(${_srcfile} \${_destfile} COPYONLY) # TODO: create additional install_manifest files? endif () ") endmacro(InstallClobberImmune)