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# SPDX-FileCopyrightText: Copyright 2025 crueter
# SPDX-License-Identifier: LGPL-3.0-or-later
## DetectArchitecture ##
#[[
Does exactly as it sounds. Detects common symbols defined for different architectures and
adds compile definitions thereof. Namely:
- arm64
- arm
- x86_64
- x86
- ia64
- mips64
- mips
- ppc64
- ppc
- riscv
- riscv64
- loongarch64
- wasm
Unsupported architectures:
- ARMv2-6
- m68k
- PIC
This file WILL NOT detect endian-ness for you.
This file is based off of Yuzu and Dynarmic.
]]
# multiarch builds are a special case and also very difficult
# this is what I have for now, but it's not ideal
# Do note that situations where multiple architectures are defined
# should NOT be too dependent on the architecture
# otherwise, you may end up with duplicate code
if (CMAKE_OSX_ARCHITECTURES)
list(LENGTH CMAKE_OSX_ARCHITECTURES architecture_count)
if (architecture_count GREATER 1)
set(MULTIARCH_BUILD 1)
else()
set(MULTIARCH_BUILD 0)
endif()
set(ARCHITECTURE "${CMAKE_OSX_ARCHITECTURES}")
# hope and pray the architecture names match
foreach(ARCH IN LISTS CMAKE_OSX_ARCHITECTURES)
set(ARCHITECTURE_${ARCH} 1)
add_definitions(-DARCHITECTURE_${ARCH}=1)
endforeach()
return()
endif()
include(CheckSymbolExists)
function(detect_architecture symbol arch)
# The output variable needs to be unset between invocations otherwise
# CMake's crazy scope rules will keep it defined
unset(SYMBOL_EXISTS CACHE)
if (NOT DEFINED ARCHITECTURE)
set(CMAKE_REQUIRED_QUIET 1)
check_symbol_exists("${symbol}" "" SYMBOL_EXISTS)
unset(CMAKE_REQUIRED_QUIET)
if (SYMBOL_EXISTS)
set(ARCHITECTURE "${arch}" PARENT_SCOPE)
set(ARCHITECTURE_${arch} 1 PARENT_SCOPE)
add_definitions(-DARCHITECTURE_${arch}=1)
endif()
endif()
endfunction()
function(detect_architecture_symbols)
if (DEFINED ARCHITECTURE)
return()
endif()
set(oneValueArgs ARCH)
set(multiValueArgs SYMBOLS)
cmake_parse_arguments(ARGS "" "${oneValueArgs}" "${multiValueArgs}"
"${ARGN}")
set(arch "${ARGS_ARCH}")
foreach(symbol ${ARGS_SYMBOLS})
detect_architecture("${symbol}" "${arch}")
if (ARCHITECTURE_${arch})
message(DEBUG "[DetectArchitecture] Found architecture symbol ${symbol} for ${arch}")
set(ARCHITECTURE "${arch}" PARENT_SCOPE)
set(ARCHITECTURE_${arch} 1 PARENT_SCOPE)
add_definitions(-DARCHITECTURE_${arch}=1)
return()
endif()
endforeach()
endfunction()
# arches here are put in a sane default order of importance
# notably, amd64, arm64, and riscv (in order) are BY FAR the most common
# mips is pretty popular in embedded
# ppc64 is pretty popular in supercomputing
# sparc is uh
# ia64 exists
# the rest exist, but are probably less popular than ia64
detect_architecture_symbols(
ARCH arm64
SYMBOLS
"__ARM64__"
"__aarch64__"
"_M_ARM64")
detect_architecture_symbols(
ARCH x86_64
SYMBOLS
"__x86_64"
"__x86_64__"
"__amd64"
"_M_X64"
"_M_AMD64")
# riscv is interesting since it generally does not define a riscv64-specific symbol
# We can, however, check for the rv32 zcf extension which is good enough of a heuristic on GCC
detect_architecture_symbols(
ARCH riscv
SYMBOLS
"__riscv_zcf")
# if zcf doesn't exist we can safely assume it's riscv64
detect_architecture_symbols(
ARCH riscv64
SYMBOLS
"__riscv")
detect_architecture_symbols(
ARCH x86
SYMBOLS
"__i386"
"__i386__"
"_M_IX86")
detect_architecture_symbols(
ARCH arm
SYMBOLS
"__arm__"
"__TARGET_ARCH_ARM"
"_M_ARM")
detect_architecture_symbols(
ARCH ia64
SYMBOLS
"__ia64"
"__ia64__"
"_M_IA64")
# mips is probably the least fun to detect due to microMIPS
# Because microMIPS is such cancer I'm considering it out of scope for now
detect_architecture_symbols(
ARCH mips64
SYMBOLS
"__mips64")
detect_architecture_symbols(
ARCH mips
SYMBOLS
"__mips"
"__mips__"
"_M_MRX000")
detect_architecture_symbols(
ARCH ppc64
SYMBOLS
"__ppc64__"
"__powerpc64__"
"_ARCH_PPC64"
"_M_PPC64")
detect_architecture_symbols(
ARCH ppc
SYMBOLS
"__ppc__"
"__ppc"
"__powerpc__"
"_ARCH_COM"
"_ARCH_PWR"
"_ARCH_PPC"
"_M_MPPC"
"_M_PPC")
detect_architecture_symbols(
ARCH sparc64
SYMBOLS
"__sparc_v9__")
detect_architecture_symbols(
ARCH sparc
SYMBOLS
"__sparc__"
"__sparc")
# I don't actually know about loongarch32 since crossdev does not support it, only 64
detect_architecture_symbols(
ARCH loongarch64
SYMBOLS
"__loongarch__"
"__loongarch64")
detect_architecture_symbols(
ARCH wasm
SYMBOLS
"__EMSCRIPTEN__")
# "generic" target
# If you have reached this point, you're on some as-of-yet unsupported architecture.
# See the docs up above for known unsupported architectures
# If you're not in the list... I think you know what you're doing.
if (NOT DEFINED ARCHITECTURE)
set(ARCHITECTURE "GENERIC")
set(ARCHITECTURE_GENERIC 1)
add_definitions(-DARCHITECTURE_GENERIC=1)
endif()
message(STATUS "[DetectArchitecture] Target architecture: ${ARCHITECTURE}")
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