154 lines
5.9 KiB
CMake
154 lines
5.9 KiB
CMake
# Author thomas.roehr@dfki.de
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#
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# Version 0.3 2013-07-02
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# - rely on `gem content` to find library and header
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# - introduce GEM_OS_PKG to allow search via pkgconfig
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# Version 0.2 2010-01-14
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# - add support for searching for multiple gems
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# Version 0.1 2010-12-15
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# - support basic search functionality
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# - tested to find rice
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#
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# OUTPUT:
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#
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# GEM_INCLUDE_DIRS After successful search contains the include directores
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#
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# GEM_LIBRARIES After successful search contains the full path of each found library
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#
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#
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# Usage:
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# set(GEM_DEBUG TRUE)
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# find_package(Gem COMPONENTS rice hoe)
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# include_directories(${GEM_INCLUDE_DIRS})
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# target_link_libraries(${GEM_LIBRARIES}
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#
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# in case pkg-config should be used to search for the os pkg, set GEM_OS_PKG, i.e.
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# set(GEM_OS_PKG TRUE)
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#
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# Check for how 'gem' should be called
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include(FindPackageHandleStandardArgs)
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find_program(GEM_EXECUTABLE
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NAMES "gem${RUBY_VERSION_MAJOR}${RUBY_VERSION_MINOR}"
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"gem${RUBY_VERSION_MAJOR}.${RUBY_VERSION_MINOR}"
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"gem-${RUBY_VERSION_MAJOR}${RUBY_VERSION_MINOR}"
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"gem-${RUBY_VERSION_MAJOR}.${RUBY_VERSION_MINOR}"
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"gem${RUBY_VERSION_MAJOR}${RUBY_VERSION_MINOR}${RUBY_VERSION_PATCH}"
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"gem${RUBY_VERSION_MAJOR}.${RUBY_VERSION_MINOR}.${RUBY_VERSION_PATCH}"
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"gem-${RUBY_VERSION_MAJOR}${RUBY_VERSION_MINOR}${RUBY_VERSION_PATCH}"
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"gem-${RUBY_VERSION_MAJOR}.${RUBY_VERSION_MINOR}.${RUBY_VERSION_PATCH}"
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"gem")
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# Making backward compatible
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if(Gem_DEBUG)
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set(GEM_DEBUG TRUE)
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endif()
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if(NOT GEM_EXECUTABLE)
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MESSAGE(FATAL_ERROR "Could not find the gem executable - install 'gem' first")
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endif()
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if(NOT Gem_FIND_COMPONENTS)
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MESSAGE(FATAL_ERROR "If searching for a Gem you have to provide COMPONENTS with the name of the gem")
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endif()
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foreach(Gem_NAME ${Gem_FIND_COMPONENTS})
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set(GEM_${Gem_NAME}_FOUND TRUE)
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list(APPEND components_found_vars GEM_${Gem_NAME}_FOUND)
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# If the gem is installed as a gem
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if(NOT GEM_OS_PKG)
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set(GEM_HOME ENV{GEM_HOME})
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# Use `gem content <gem-name>` to extract current information about installed gems
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# Store the information into ${GEM_LOCAL_INFO}
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EXECUTE_PROCESS(COMMAND ${GEM_EXECUTABLE} content ${Gem_NAME}
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RESULT_VARIABLE GEM_RUN_RESULT
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OUTPUT_VARIABLE GEM_LOCAL_INFO)
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if(GEM_RUN_RESULT STREQUAL "0")
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list(APPEND FOUND_GEMS ${Gem_NAME})
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set(_library_NAME_PATTERN lib${Gem_NAME}.a
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lib${Gem_NAME}.so
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lib${Gem_NAME}.dylib
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${Gem_NAME}.a
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${Gem_NAME}.so
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${Gem_NAME}.dylib
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.*.a
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.*.so
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.*.dylib
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)
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set(_header_SUFFIX_PATTERN
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.h
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.hh
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.hpp
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)
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# Create a list from the output results of the gem command
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string(REPLACE "\n" ";" GEM_CONTENT_LIST "${GEM_LOCAL_INFO}")
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foreach(_gem_CONTENT_PATH ${GEM_CONTENT_LIST})
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# Convert so that only '/' Unix path separator are being using
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# needed to do proper regex matching
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FILE(TO_CMAKE_PATH ${_gem_CONTENT_PATH} gem_CONTENT_PATH)
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# Identify library -- checking for a library in the gems 'lib' (sub)directory
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# Search for an existing library, but only within the gems folder
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foreach(_library_NAME ${_library_NAME_PATTERN})
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STRING(REGEX MATCH ".*${Gem_NAME}.*/lib/.*${_library_NAME}$" GEM_PATH_INFO "${gem_CONTENT_PATH}")
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if(NOT "${GEM_PATH_INFO}" STREQUAL "")
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list(APPEND GEM_LIBRARIES ${GEM_PATH_INFO})
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break()
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endif()
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endforeach()
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# Identify headers
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# Checking for available headers in an include directory
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foreach(_header_PATTERN ${_header_SUFFIX_PATTERN})
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STRING(REGEX MATCH ".*${Gem_NAME}.*/include/.*${_header_PATTERN}$" GEM_PATH_INFO "${gem_CONTENT_PATH}")
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if(NOT "${GEM_PATH_INFO}" STREQUAL "")
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STRING(REGEX REPLACE "(.*${Gem_NAME}.*/include/).*${_header_PATTERN}$" "\\1" GEM_PATH_INFO "${gem_CONTENT_PATH}")
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list(APPEND GEM_INCLUDE_DIRS ${GEM_PATH_INFO})
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break()
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endif()
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endforeach()
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endforeach()
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else()
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set(GEM_${Gem_NAME}_FOUND FALSE)
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endif()
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else(NOT GEM_OS_PKG)
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pkg_check_modules(GEM_PKG ${Gem_NAME})
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set(GEM_${GEM_NAME}_FOUND GEM_PKG_FOUND)
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set(GEM_INCLUDE_DIRS ${GEM_PKG_INCLUDE_DIRS})
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set(GEM_LIBRARIES ${GEM_PKG_LIBRARIES} ${GEM_PKG_STATIC_LIBRARIES})
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list(APPEND GEM_LIBRARIES ${GEM_PKG_LDFLAGS} ${GEM_PKG_STATIC_LDFLAGS})
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list(APPEND GEM_LIBRARIES ${GEM_PKG_LDFLAGS_OTHER} ${GEM_PKG_STATIC_LDFLAGS_OTHER})
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if(GEM_DEBUG)
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message(STATUS "GEM_OS_PKG is defined")
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message(STATUS "GEM_INCLUDE_DIRS ${GEM_INCLUDE_DIRS}")
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message(STATUS "GEM_STATIC_LIBRARY_DIRS ${GEM_PKG_STATIC_LIBRARY_DIRS}")
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message(STATUS "GEM_LIBRARY_DIRS ${GEM_PKG_STATIC_LIBRARY_DIRS}")
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message(STATUS "GEM_STATIC_LIBRARIES ${GEM_PKG_STATIC_LIBRARIES}")
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message(STATUS "GEM_LIBRARIES ${GEM_LIBRARIES}")
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endif()
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endif()
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if(GEM_DEBUG)
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message(STATUS "${Gem_NAME} library dir: ${GEM_LIBRARIES}")
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message(STATUS "${Gem_NAME} include dir: ${GEM_INCLUDE_DIRS}")
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endif()
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endforeach()
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# Compact the lists
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if(DEFINED GEM_LIBRARIES)
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LIST(REMOVE_DUPLICATES GEM_LIBRARIES)
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endif()
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if(DEFINED GEM_INCLUDE_DIRS)
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LIST(REMOVE_DUPLICATES GEM_INCLUDE_DIRS)
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endif()
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find_package_handle_standard_args(GEM
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REQUIRED_VARS ${components_found_vars}
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FAIL_MESSAGE "Could not find all required gems")
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