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# The old CMake PROJECT-NAME was PROJ4.
set (PROJECT_LEGACY_NAME PROJ4)
string (TOLOWER "${PROJECT_NAME}" PROJECT_NAME_LOWER)
string (TOLOWER "${PROJECT_LEGACY_NAME}" PROJECT_LEGACY_LOWER)
# Starting with version 7.0, we install config-style find package
# files so that PROJ can be found with both
#
# find_package(PROJ)
# find_package(PROJ4)
#
# Here are the details... The command
#
# find_package(PROJ)
#
# if successful, will define variables
#
# PROJ_FOUND
# PROJ_VERSION
# PROJ_LIBRARIES = PROJ::proj
# PROJ_INCLUDE_DIRS
# etc
#
# and will define targets
#
# PROJ::proj
# PROJ4::proj
#
# Similarly
#
# find_package(PROJ4)
#
# if successful, will define variables
#
# PROJ4_FOUND
# PROJ4_VERSION
# PROJ4_LIBRARIES = PROJ4::proj
# PROJ4_INCLUDE_DIRS
# etc
#
# and will define targets
#
# PROJ::proj
# PROJ4::proj
#
# Note that targets PROJ::proj and PROJ4::proj are provided in both
# cases. However, no attempt is made to define both sets of variables
# with the two find_package options. Doing so would just lead to user
# confusion.
#
# Because pre-7.0 versions of PROJ do not support find_package (PROJ)
# and do not define a target PROJ::proj
#
# find_package(PROJ4)
#
# (instead of PROJ) should be used in any development scenarios which
# might involve (even indirectly) pre-7.0 versions of PROJ.
#
# At some future dates, find_package (PROJ4) will
#
# define PROJ4_LIBRARIES = PROJ::proj
# give WARNING message suggesting migration to find_package(PROJ)
# be disallowed via the version checking code
#
# At some more distant date, the PROJ4::proj target will be retired.
#
# To support this change, the CACHE variables PROJ_CMAKE_SUBDIR (and
# CMAKECONFIGDIR) is now the "Parent of directory to install cmake
# config files into".
#
# All this messiness is confined to
#
# cmake/CMakeLists.txt (this file)
# cmake/project-config.cmake.in
# cmake/project-config-version.cmake.in
# Variables needed by ${PROJECT_NAME_LOWER}-config-version.cmake
if (MSVC)
# For checking the compatibility of MSVC_TOOLSET_VERSION; see
# https://docs.microsoft.com/en-us/cpp/porting/overview-of-potential-upgrade-issues-visual-cpp
# Assume major version number is obtained by dropping the last decimal
# digit.
math (EXPR MSVC_TOOLSET_MAJOR "${MSVC_TOOLSET_VERSION}/10")
else ()
set (MSVC_TOOLSET_VERSION 0)
set (MSVC_TOOLSET_MAJOR 0)
endif ()
if (CMAKE_CROSSCOMPILING)
# Ensure that all "true" (resp. "false") settings are represented by
# the same string.
set (CMAKE_CROSSCOMPILING_STR "ON")
else ()
set (CMAKE_CROSSCOMPILING_STR "OFF")
endif ()
foreach (PROJECT_VARIANT_NAME ${PROJECT_NAME} ${PROJECT_LEGACY_NAME})
string (TOLOWER "${PROJECT_VARIANT_NAME}" PROJECT_VARIANT_LOWER)
set (CMAKECONFIGSUBDIR "${CMAKECONFIGDIR}/${PROJECT_VARIANT_LOWER}")
# proj-config.cmake for the install tree. It's installed in
# ${CMAKECONFIGSUBDIR} and @PROJECT_ROOT_DIR@ is the relative
# path to the root from there. (Note that the whole install tree can
# be relocated.)
file (RELATIVE_PATH PROJECT_ROOT_DIR
${CMAKE_INSTALL_PREFIX}/${CMAKECONFIGSUBDIR} ${CMAKE_INSTALL_PREFIX})
configure_file (project-config.cmake.in
project-${PROJECT_VARIANT_LOWER}-config.cmake @ONLY)
configure_file (project-config-version.cmake.in
project-${PROJECT_VARIANT_LOWER}-version.cmake @ONLY)
install(FILES
"${CMAKE_CURRENT_BINARY_DIR}/project-${PROJECT_VARIANT_LOWER}-config.cmake"
DESTINATION "${CMAKECONFIGSUBDIR}"
RENAME "${PROJECT_VARIANT_LOWER}-config.cmake")
install(FILES
"${CMAKE_CURRENT_BINARY_DIR}/project-${PROJECT_VARIANT_LOWER}-version.cmake"
DESTINATION "${CMAKECONFIGSUBDIR}"
RENAME "${PROJECT_VARIANT_LOWER}-config-version.cmake")
# Make information about the cmake targets (the library and the tools)
# available.
install(EXPORT targets
NAMESPACE ${PROJECT_NAME}::
FILE ${PROJECT_NAME_LOWER}-targets.cmake
DESTINATION "${CMAKECONFIGSUBDIR}")
install(EXPORT targets
NAMESPACE ${PROJECT_LEGACY_NAME}::
FILE ${PROJECT_LEGACY_LOWER}-targets.cmake
DESTINATION "${CMAKECONFIGSUBDIR}")
endforeach ()
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