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# Find the given library in the system locations, or build in-tree if not found.
#
# Arguments:
# PKG_NAME - name of the package as passed to find_package
# PKG_PATH - name of the source tree relative to extlib/
#
# The rest of the arguments are VARIABLE VALUE pairs. If the library is not found,
# every VARIABLE will be set to VALUE and find_package will be rerun with the REQUIRED flag.
# Regardless of where the library was found, only the specified VARIABLEs that start with
# ${PKG_NAME} will be set in the parent scope.
#
# All warnings in the in-tree package are disabled.
include(DisableWarnings)
function(find_vendored_package PKG_NAME PKG_PATH)
if(NOT FORCE_VENDORED_${PKG_NAME})
find_package(${PKG_NAME})
endif()
set(cfg_name)
foreach(item ${ARGN})
if(NOT cfg_name)
set(cfg_name ${item})
else()
set(${cfg_name} ${item} CACHE INTERNAL "")
set(cfg_name)
endif()
endforeach()
disable_warnings()
string(TOUPPER ${PKG_NAME} VAR_NAME)
if(NOT ${VAR_NAME}_FOUND)
message(STATUS "Using in-tree ${PKG_PATH}")
set(${VAR_NAME}_IN_TREE YES CACHE INTERNAL "")
add_subdirectory(extlib/${PKG_PATH} EXCLUDE_FROM_ALL)
find_package(${PKG_NAME} REQUIRED)
elseif(${VAR_NAME}_IN_TREE)
add_subdirectory(extlib/${PKG_PATH} EXCLUDE_FROM_ALL)
endif()
# Now put everything we just discovered into the cache.
set(cfg_name)
foreach(item ${ARGN} ${VAR_NAME}_FOUND)
if(NOT cfg_name)
set(cfg_name ${item})
else()
if(cfg_name MATCHES "^${VAR_NAME}")
set(${cfg_name} "${${cfg_name}}" CACHE INTERNAL "")
endif()
set(cfg_name)
endif()
endforeach()
endfunction()
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