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