# SPDX-FileCopyrightText: Copyright 2026 crueter
# SPDX-License-Identifier: LGPL-3.0-or-later

## DetectPlatform ##

# This is a small helper that sets platform variables for various
# operating systems and distributions. Note that Apple, Windows, Android, etc.
# are not covered, as CMake already does that for us.

# It also sets CXX_<compiler> for the C++ compiler.

# This module contains contributions from the Eden Emulator Project,
# notably from crueter and Lizzie.

if (${CMAKE_SYSTEM_NAME} STREQUAL "SunOS")
    set(SOLARIS ON)
elseif (${CMAKE_SYSTEM_NAME} STREQUAL "OpenOrbis")
    set(OPENORBIS ON)
elseif (${CMAKE_SYSTEM_NAME} STREQUAL "managarm")
    set(MANAGARM ON)
elseif (${CMAKE_SYSTEM_NAME} STREQUAL "Haiku")
    set(HAIKUOS ON)
endif()

# BSD
if (DEFINED BSD)
    if ("${BSD}" STREQUAL "DragonFlyBSD")
        set(DRAGONFLYBSD ON)
    elseif ("${BSD}" STREQUAL "FreeBSD")
        set(FREEBSD ON)
    elseif ("${BSD}" STREQUAL "OpenBSD")
        set(OPENBSD ON)
    elseif ("${BSD}" STREQUAL "NetBSD")
        set(NETBSD ON)
    endif()
endif()

# dumb heuristic to detect msys2
if (CMAKE_COMMAND MATCHES "msys64")
    set(MSYS2 ON)
endif()

# compiler checks
if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
    set(CXX_CLANG ON)
    if (MSVC)
        set(CXX_CLANG_CL ON)
    endif()
elseif (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
    set(CXX_GCC ON)
elseif (CMAKE_CXX_COMPILER_ID STREQUAL "IntelLLVM")
    set(CXX_ICC ON)
elseif (CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
    set(CXX_APPLE ON)
endif()

# https://gitlab.kitware.com/cmake/cmake/-/merge_requests/11112
# This works totally fine on MinGW64, but not CLANG{,ARM}64
if(MINGW AND CXX_CLANG)
    set(CMAKE_SYSTEM_VERSION 10.0.0)
endif()

# MSYS2 utilities

# Sometimes, PkgConfig modules will incorrectly reference / when CMake
# wants you to reference it as C:/msys64/. This function corrects that.
# Example in a Find module:
#[[
    if (MSYS2)
        FixMsysPath(PkgConfig::OPUS)
    endif()
]]

function(FixMsysPath target)
    get_target_property(include_dir ${target} INTERFACE_INCLUDE_DIRECTORIES)

    if (NOT (include_dir MATCHES "^/"))
        return()
    endif()

    set(root_default $ENV{MSYS2_LOCATION})
    if (root_default STREQUAL "")
        set(root_default "C:/msys64")
    endif()

    set(MSYS_ROOT_PATH ${root_default}
        CACHE STRING "Location of the MSYS2 root")

    set(include_dir "C:/msys64${include_dir}")
    set_target_properties(${target} PROPERTIES
        INTERFACE_INCLUDE_DIRECTORIES ${include_dir})
endfunction()

# Saves linking time
if (MINGW)
    set(MINGW_FLAGS "-Wl,--strip-all -Wl,--gc-sections")
    set(CMAKE_EXE_LINKER_FLAGS_RELEASE
        "${CMAKE_EXE_LINKER_FLAGS_RELEASE} ${MINGW_FLAGS}")
endif()