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# This macro can be used to install symlinks, which turns out to be
# non-trivial due to CMake version differences and limitations on how
# files can be installed when building binary packages.
#
# The rule for binary packaging is that files (including symlinks) must
# be installed with the standard CMake install() macro. We do so via
# a detour through CMAKE_CURRENT_BINARY_DIR: at install time we create
# the symlink there (using a tweaked name, to avoid collisions), then
# install that, and then clean it up to avoid leaving potential dangling
# symlinks in the build tree.
#
# The rule for non-binary packaging is that CMake 2.6 cannot install()
# symlinks, but can create the symlink at install-time via scripting.
# Though, we assume that CMake 2.6 isn't going to be used to generate
# packages because versions later than 2.8.3 are superior for that purpose.
#
# _filepath: the absolute path to the file to symlink
# _sympath: absolute path of the installed symlink
macro(InstallSymlink _filepath _sympath)
get_filename_component(_symname ${_sympath} NAME)
get_filename_component(_installdir ${_sympath} PATH)
if (BINARY_PACKAGING_MODE)
# We need install(CODE ...) here to run this at installation time.
# execute_process would run at the configuration stage, making the
# symlink potentially conflict with other actions by the caller.
install(CODE "
execute_process(COMMAND \"${CMAKE_COMMAND}\" -E create_symlink
${_filepath}
${CMAKE_CURRENT_BINARY_DIR}/${_symname}.link)
")
install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${_symname}.link
DESTINATION ${_installdir}
RENAME ${_symname})
install(CODE "file(REMOVE ${CMAKE_CURRENT_BINARY_DIR}/${_symname}.link)")
else ()
# scripting the symlink installation at install time should work
# for CMake 2.6.x and 2.8.x
install(CODE "
if (\"\$ENV{DESTDIR}\" STREQUAL \"\")
execute_process(COMMAND \"${CMAKE_COMMAND}\" -E create_symlink
${_filepath}
${_installdir}/${_symname})
else ()
execute_process(COMMAND \"${CMAKE_COMMAND}\" -E create_symlink
${_filepath}
\$ENV{DESTDIR}/${_installdir}/${_symname})
endif ()
")
endif ()
endmacro(InstallSymlink)
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