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# Check if a dependency exists and declare a target named Dep::$name.
# If USE_SYSTEM_LIBS variable is set, find dependency via pkg-config.
if (USE_SYSTEM_LIBS)
find_package(PkgConfig REQUIRED)
endif()
macro(check_dependency target_var pkg_config_name vcpkg_name vcpkg_target_name)
cmake_parse_arguments(_ARG "REQUIRED;CONFIG" "" "" ${ARGN})
set(_REQUIRED "")
if (_ARG_REQUIRED)
set(_REQUIRED "REQUIRED")
endif()
set(_CONFIG "")
if (_ARG_CONFIG)
set(_CONFIG "CONFIG")
endif()
string(TOUPPER ${target_var} _TARGET_VAR_UPPER)
set(HAVE_${_TARGET_VAR_UPPER} FALSE)
if (USE_SYSTEM_LIBS)
pkg_check_modules(${target_var} ${_REQUIRED} IMPORTED_TARGET ${pkg_config_name})
if (${target_var}_FOUND)
add_library(Dep::${target_var} ALIAS PkgConfig::${target_var})
set(HAVE_${_TARGET_VAR_UPPER} TRUE)
endif()
else()
find_package(${vcpkg_name} ${_CONFIG} ${_REQUIRED})
if (TARGET ${vcpkg_target_name})
set(actual_target ${vcpkg_target_name})
get_target_property(aliased_target ${actual_target} ALIASED_TARGET)
if (aliased_target AND NOT "${aliased_target}" MATCHES "NOTFOUND")
set(actual_target ${aliased_target})
endif()
add_library(Dep::${target_var} ALIAS ${actual_target})
set(HAVE_${_TARGET_VAR_UPPER} TRUE)
endif()
endif()
endmacro()
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