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feat: Add Yocto build support for 32-bit and 64-bit architectures to examples, including new build scripts, CMake logic, and documentation.

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dian.yuan 2026-02-25 15:46:48 +08:00
parent 72e0647351
commit 9172f4f2f5
10 changed files with 900 additions and 36 deletions
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71
examples/cmake/yocto-toolchain.cmake Normal file
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# Yocto cross-compilation toolchain
#
# Required cache variables (pass via -D):
# YOCTO_SDK_ROOT - Yocto SDK root dir (contains sysroots/)
# ARCH_BITS - 32 or 64
#
# Example:
# cmake -DCMAKE_TOOLCHAIN_FILE=cmake/yocto-toolchain.cmake \
# -DYOCTO_SDK_ROOT=/opt/poky/4.0.20 \
# -DARCH_BITS=64 ...
set(CMAKE_SYSTEM_NAME Linux)
# Fallback to environment variables if not defined via -D
if(NOT DEFINED YOCTO_SDK_ROOT AND DEFINED ENV{YOCTO_SDK_ROOT})
set(YOCTO_SDK_ROOT "$ENV{YOCTO_SDK_ROOT}")
endif()
if(NOT DEFINED ARCH_BITS AND DEFINED ENV{ARCH_BITS})
set(ARCH_BITS "$ENV{ARCH_BITS}")
endif()
# Mandatory check
if(NOT DEFINED YOCTO_SDK_ROOT)
message(FATAL_ERROR "YOCTO_SDK_ROOT must point to the Yocto SDK root directory")
endif()
if(NOT DEFINED ARCH_BITS)
message(FATAL_ERROR "ARCH_BITS must be set to 32 or 64")
endif()
# Propagate these variables to try_compile sub-projects
list(APPEND CMAKE_TRY_COMPILE_PLATFORM_VARIABLES YOCTO_SDK_ROOT ARCH_BITS)
set(_HOST_SYSROOT "${YOCTO_SDK_ROOT}/sysroots/x86_64-pokysdk-linux")
if(NOT IS_DIRECTORY "${_HOST_SYSROOT}")
message(FATAL_ERROR "Yocto host sysroot not found: ${_HOST_SYSROOT}")
endif()
if(ARCH_BITS EQUAL 32)
set(_TARGET_SYSROOT "${YOCTO_SDK_ROOT}/sysroots/armv7at2hf-neon-poky-linux-gnueabi")
set(_TRIPLE "arm-poky-linux-gnueabi")
set(_ARCH_FLAGS "-march=armv7-a -marm -mfpu=vfp -mfloat-abi=hard")
elseif(ARCH_BITS EQUAL 64)
set(_TARGET_SYSROOT "${YOCTO_SDK_ROOT}/sysroots/armv8a-poky-linux")
set(_TRIPLE "aarch64-poky-linux")
set(_ARCH_FLAGS "")
else()
message(FATAL_ERROR "Unsupported ARCH_BITS: ${ARCH_BITS} (expected 32 or 64)")
endif()
if(NOT IS_DIRECTORY "${_TARGET_SYSROOT}")
message(FATAL_ERROR "Yocto target sysroot not found: ${_TARGET_SYSROOT}")
endif()
set(CMAKE_C_COMPILER "${_HOST_SYSROOT}/usr/bin/${_TRIPLE}/${_TRIPLE}-gcc")
set(CMAKE_CXX_COMPILER "${_HOST_SYSROOT}/usr/bin/${_TRIPLE}/${_TRIPLE}-g++")
set(CMAKE_SYSROOT "${_TARGET_SYSROOT}")
set(CMAKE_C_FLAGS_INIT "--sysroot=${_TARGET_SYSROOT} ${_ARCH_FLAGS}")
set(CMAKE_CXX_FLAGS_INIT "--sysroot=${_TARGET_SYSROOT} ${_ARCH_FLAGS}")
set(CMAKE_EXE_LINKER_FLAGS_INIT "--sysroot=${_TARGET_SYSROOT}")
set(CMAKE_SHARED_LINKER_FLAGS_INIT "--sysroot=${_TARGET_SYSROOT}")
set(CMAKE_FIND_ROOT_PATH "${_TARGET_SYSROOT}")
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
# Expose ARCH_BITS and triple for CMakeLists.txt to use
set(YOCTO_CROSS_TRIPLE "${_TRIPLE}" CACHE INTERNAL "")