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# like add_library(new ALIAS old) but avoids add_library cannot create ALIAS target "new" because target "old" is imported but not globally visible. on older cmake
# This can be replaced with a direct alias call once our minimum is cmake 3.18
function(dolphin_alias_library new old)
string(REPLACE "::" "" library_no_namespace ${old})
if (NOT TARGET _alias_${library_no_namespace})
add_library(_alias_${library_no_namespace} INTERFACE)
target_link_libraries(_alias_${library_no_namespace} INTERFACE ${old})
endif()
add_library(${new} ALIAS _alias_${library_no_namespace})
endfunction()
# Makes an imported target if it doesn't exist. Useful for when find scripts from older versions of cmake don't make the targets you need
function(dolphin_make_imported_target_if_missing target lib)
if(${lib}_FOUND AND NOT TARGET ${target})
add_library(_${lib} INTERFACE)
target_link_libraries(_${lib} INTERFACE "${${lib}_LIBRARIES}")
target_include_directories(_${lib} INTERFACE "${${lib}_INCLUDE_DIRS}")
add_library(${target} ALIAS _${lib})
endif()
endfunction()
function(dolphin_optional_system_library library)
string(TOUPPER ${library} upperlib)
set(USE_SYSTEM_${upperlib} "" CACHE STRING "Use system ${library} instead of bundled. ON - Always use system and fail if unavailable, OFF - Always use bundled, AUTO - Use system if available, otherwise use bundled, blank - Delegate to USE_SYSTEM_LIBS. Default is blank.")
if("${USE_SYSTEM_${upperlib}}" STREQUAL "")
if(APPROVED_VENDORED_DEPENDENCIES)
string(TOLOWER ${library} lowerlib)
if(lowerlib IN_LIST APPROVED_VENDORED_DEPENDENCIES)
set(RESOLVED_USE_SYSTEM_${upperlib} AUTO PARENT_SCOPE)
else()
set(RESOLVED_USE_SYSTEM_${upperlib} ON PARENT_SCOPE)
endif()
else()
set(RESOLVED_USE_SYSTEM_${upperlib} ${USE_SYSTEM_LIBS} PARENT_SCOPE)
endif()
else()
set(RESOLVED_USE_SYSTEM_${upperlib} ${USE_SYSTEM_${upperlib}} PARENT_SCOPE)
endif()
endfunction()
function(dolphin_add_bundled_library library bundled_path)
string(TOUPPER ${library} upperlib)
if (${RESOLVED_USE_SYSTEM_${upperlib}} STREQUAL "AUTO")
message(STATUS "No system ${library} was found. Using static ${library} from Externals.")
else()
message(STATUS "Using static ${library} from Externals")
endif()
if (NOT EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/${bundled_path}/CMakeLists.txt")
message(FATAL_ERROR "No bundled ${library} was found. Did you forget to checkout submodules?")
endif()
add_subdirectory(${bundled_path} EXCLUDE_FROM_ALL)
endfunction()
function(dolphin_find_optional_system_library library bundled_path)
dolphin_optional_system_library(${library})
string(TOUPPER ${library} upperlib)
if(RESOLVED_USE_SYSTEM_${upperlib})
find_package(${library} ${ARGN})
# Yay for cmake packages being inconsistent
if(DEFINED ${library}_FOUND)
set(prefix ${library})
else()
set(prefix ${upperlib})
endif()
if((NOT ${found}) AND (NOT ${RESOLVED_USE_SYSTEM_${upperlib}} STREQUAL "AUTO"))
message(FATAL_ERROR "No system ${library} was found. Please install it or set USE_SYSTEM_${upperlib} to AUTO or OFF.")
endif()
endif()
if(${prefix}_FOUND)
message(STATUS "Using system ${library}")
set(${prefix}_TYPE "System" PARENT_SCOPE)
else()
dolphin_add_bundled_library(${library} ${bundled_path})
set(${prefix}_TYPE "Bundled" PARENT_SCOPE)
endif()
endfunction()
function(dolphin_find_optional_system_library_pkgconfig library search alias bundled_path)
dolphin_optional_system_library(${library})
string(TOUPPER ${library} upperlib)
if(RESOLVED_USE_SYSTEM_${upperlib})
pkg_search_module(${library} ${search} ${ARGN} IMPORTED_TARGET)
if((NOT ${library}_FOUND) AND (NOT ${RESOLVED_USE_SYSTEM_${upperlib}} STREQUAL "AUTO"))
message(FATAL_ERROR "No system ${library} was found. Please install it or set USE_SYSTEM_${upperlib} to AUTO or OFF.")
endif()
endif()
if(${library}_FOUND)
message(STATUS "Using system ${library}")
dolphin_alias_library(${alias} PkgConfig::${library})
set(${library}_TYPE "System" PARENT_SCOPE)
else()
dolphin_add_bundled_library(${library} ${bundled_path})
set(${library}_TYPE "Bundled" PARENT_SCOPE)
endif()
endfunction()
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