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# SPDX-FileCopyrightText: 2022 Dawid Wróbel <me@dawidwrobel.com>
# SPDX-License-Identifier: GPL-2.0-or-later
include(CheckIncludeFile)
include(CheckSymbolExists)
check_include_file("getopt.h" HAVE_GETOPT_H)
check_symbol_exists("getopt_long" "getopt.h" HAVE_GETOPT_LONG)
if (HAVE_GETOPT_H)
set(HAVE_GETOPT_H 1 PARENT_SCOPE)
endif ()
if (HAVE_GETOPT_LONG)
set(HAVE_GETOPT_LONG 1 PARENT_SCOPE)
endif ()
# C library on non-POSIX systems does not come with `getopt` by default.
# Some third-party libraries, however, are commonly used. `vcpkg`, for example, provides `getopt-win32` for Windows,
# based on https://github.com/libimobiledevice-win32/getopt
# Another commonly-used implementation is https://github.com/takamin/win-c
find_library(GETOPT_LIBRARY NAMES getopt DOC "A non-glibc, external getopt library")
if (GETOPT_LIBRARY)
message(STATUS "Found an external getopt library: ${GETOPT_LIBRARY}")
if (NOT HAVE_GETOPT_LONG)
find_path(GETOPT_INCLUDE_DIR NAMES getopt.h)
if (GETOPT_INCLUDE_DIR)
message(STATUS "Found getopt includes: ${GETOPT_INCLUDE_DIR}")
else ()
message(ERROR "Couldn't locate matching includes for the external library!")
endif ()
endif ()
if (NOT TARGET getopt)
add_library(getopt UNKNOWN IMPORTED GLOBAL)
if (GETOPT_INCLUDE_DIR)
set_target_properties(getopt PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${GETOPT_INCLUDE_DIR}")
endif ()
set_property(TARGET getopt APPEND PROPERTY IMPORTED_LOCATION "${GETOPT_LIBRARY}")
endif ()
else ()
# If we're not on POSIX system and an external library wasn't found, let's fallback to our copy of the glibc code
if (NOT HAVE_GETOPT_LONG AND NOT TARGET getopt)
message(STATUS "A 3rd-party getopt library was not found, so using own copy.")
add_library(getopt STATIC getopt.c getopt1.c getopt.h)
set_target_properties(getopt PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${CMAKE_CURRENT_SOURCE_DIR}")
endif ()
endif ()
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