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Make OpenJPEGConfig.cmake relocatable with CMake > 3.0 

Using CMakePackageConfigHelpers, we can generate a relocatable
OpenJPEGConfig.config, using the PATH_VARS feature to make
CMAKE_INSTALL_LIBDIR relative to the installed location.
This change is needed for me when cross-compiling since
CMAKE_INSTALL_FULL_LIBDIR is a path inside the sysroot rather than
an absolute path to the actual includes. Without this change poppler
ends up passing a -I flag that does not exist.

This includes fallback code for CMake 2.8, which adds a bit of complexity,
since I'm not sure if raising the minimum to 3.0 (now over 8 years old)
is acceptable.
This commit is contained in:
Alex Richardson 2022-08-11 12:09:04 +00:00
parent c7bccf0515
commit c6ceb84c22
2 changed files with 18 additions and 6 deletions
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21
CMakeLists.txt
View File

@ -304,12 +304,23 @@ if(BUILD_TESTING)
endif()
#-----------------------------------------------------------------------------
# install all targets referenced as OPENJPEGTargets
# install all targets referenced as OPENJPEGTargets (relocatable with CMake 3.0+)
install(EXPORT OpenJPEGTargets DESTINATION ${OPENJPEG_INSTALL_PACKAGE_DIR})
configure_file( ${${OPENJPEG_NAMESPACE}_SOURCE_DIR}/cmake/OpenJPEGConfig.cmake.in
${${OPENJPEG_NAMESPACE}_BINARY_DIR}/OpenJPEGConfig.cmake
@ONLY
)
if (${CMAKE_VERSION} VERSION_LESS 3.0)
set(PACKAGE_INIT)
set(PACKAGE_CMAKE_INSTALL_INCLUDEDIR ${CMAKE_INSTALL_FULL_INCLUDEDIR})
configure_file( ${${OPENJPEG_NAMESPACE}_SOURCE_DIR}/cmake/OpenJPEGConfig.cmake.in
${${OPENJPEG_NAMESPACE}_BINARY_DIR}/OpenJPEGConfig.cmake
@ONLY
)
else()
include(CMakePackageConfigHelpers)
configure_package_config_file(${CMAKE_CURRENT_LIST_DIR}/cmake/OpenJPEGConfig.cmake.in
${OPENJPEG_BINARY_DIR}/OpenJPEGConfig.cmake
INSTALL_DESTINATION ${OPENJPEG_INSTALL_PACKAGE_DIR}
PATH_VARS CMAKE_INSTALL_INCLUDEDIR)
endif()
install( FILES ${OPENJPEG_BINARY_DIR}/OpenJPEGConfig.cmake
DESTINATION ${OPENJPEG_INSTALL_PACKAGE_DIR}
)

3
cmake/OpenJPEGConfig.cmake.in
View File

@ -5,6 +5,7 @@
# This file is configured by OPENJPEG and used by the UseOPENJPEG.cmake
# module to load OPENJPEG's settings for an external project.
@OPENJPEG_CONFIG_INSTALL_ONLY@
@PACKAGE_INIT@
# The OPENJPEG version number.
set(OPENJPEG_MAJOR_VERSION "@OPENJPEG_VERSION_MAJOR@")
set(OPENJPEG_MINOR_VERSION "@OPENJPEG_VERSION_MINOR@")
@ -27,7 +28,7 @@ if(EXISTS ${SELF_DIR}/OpenJPEGTargets.cmake)
# This is an install tree
include(${SELF_DIR}/OpenJPEGTargets.cmake)
set(INC_DIR "@CMAKE_INSTALL_FULL_INCLUDEDIR@/@OPENJPEG_INSTALL_SUBDIR@")
set(INC_DIR "@PACKAGE_CMAKE_INSTALL_INCLUDEDIR@/@OPENJPEG_INSTALL_SUBDIR@")
get_filename_component(OPENJPEG_INCLUDE_DIRS "${INC_DIR}" ABSOLUTE)
else()