使用 LLVM-for-Arm 工具链编译 RT-Thread 源码
发布于 2021-12-21 09:51:45 浏览：2541 订阅该版
使用 LLVM 编译 RT-Thread
硬件测试环境
pdd 不久前搞活动， 99 块买了两块阿里出的 L469 的开发板，最高主频为 80Mhz。所以本次测试硬件就使用该开发板进行测试。
工具准备
使用 git 工具下载 llvm 工具链：
git clone https://github.com/ARM-software/LLVM-embedded-toolchain-for-Arm.git
下载 make 工具：
git clone https://github.com/xpack-dev-tools/windows-build-tools-xpack.git
编译
在
rt-thread\bsp\stm32\stm32l496-ali-developer目录下打开 env 工具：使用命令
scons --target=cmake生成 CMakelists.txt 文件：这里的命令生成的 CMake 文件使用的是 gcc 的工具链，需要修改一下使用 llvm 的工具链：
SET(CMAKE_C_COMPILER "D:/download/idm/LLVMEmbeddedToolchainForArm-13.0.0-windows/LLVMEmbeddedToolchainForArm-13.0.0/bin/clang.exe")SET(CMAKE_ASM_COMPILER "D:/download/idm/LLVMEmbeddedToolchainForArm-13.0.0-windows/LLVMEmbeddedToolchainForArm-13.0.0/bin/clang.exe")SET(CMAKE_C_FLAGS "--config armv7em_hard_fpv4_sp_d16_nosys -Os")SET(CMAKE_ASM_FLAGS " -c --config armv7em_hard_fpv4_sp_d16_nosys -Wa,-mimplicit-it=thumb")SET(CMAKE_C_COMPILER_WORKS TRUE)SET(CMAKE_CXX_COMPILER "D:/download/idm/LLVMEmbeddedToolchainForArm-13.0.0-windows/LLVMEmbeddedToolchainForArm-13.0.0/bin/clang++.exe")SET(CMAKE_CXX_FLAGS "--config armv7em_hard_fpv4_sp_d16_nosys -Os")SET(CMAKE_CXX_COMPILER_WORKS TRUE)SET(CMAKE_OBJCOPY "D:/download/idm/LLVMEmbeddedToolchainForArm-13.0.0-windows/LLVMEmbeddedToolchainForArm-13.0.0/bin/llvm-objcopy.exe")SET(CMAKE_SIZE "D:/download/idm/LLVMEmbeddedToolchainForArm-13.0.0-windows/LLVMEmbeddedToolchainForArm-13.0.0/bin/llvm-size.exe")SET(CMAKE_EXE_LINKER_FLAGS "--config armv7em_hard_fpv4_sp_d16_nosys ,--gc-sections,-Map=rtthread.map,-u,Reset_Handler -T ${CMAKE_SOURCE_DIR}/board/linker_scripts/link.lds")
输入命令
cd build & cmake -G "MinGW Makefiles" .. & D:\software\tools\xpack-windows-build-tools-2.12.2\bin\make.exe编译工程：LiuKang@DESKTOP-538H6DE D:\repo\github\rt-thread\bsp\stm32\stm32l496-ali-developer$ cd buildLiuKang@DESKTOP-538H6DE D:\repo\github\rt-thread\bsp\stm32\stm32l496-ali-developer\build$ cmake -G "MinGW Makefiles" ..-- Configuring done-- Generating done-- Build files have been written to: D:/repo/github/rt-thread/bsp/stm32/stm32l496-ali-developer/buildLiuKang@DESKTOP-538H6DE D:\repo\github\rt-thread\bsp\stm32\stm32l496-ali-developer\build$ D:\software\tools\xpack-windows-build-tools-2.12.2\bin\make.exe[ 1%] Building C object CMakeFiles/rtthread.elf.dir/applications/main.c.obj[ 2%] Building C object CMakeFiles/rtthread.elf.dir/packages/CoreMark-latest/core_main.c.obj[ 4%] Building C object CMakeFiles/rtthread.elf.dir/packages/CoreMark-latest/core_util.c.obj[ 5%] Building C object CMakeFiles/rtthread.elf.dir/packages/CoreMark-latest/core_portme.c.obj[ 7%] Building C object CMakeFiles/rtthread.elf.dir/packages/CoreMark-latest/core_list_join.c.obj[ 8%] Building C object CMakeFiles/rtthread.elf.dir/packages/CoreMark-latest/core_state.c.obj[ 10%] Building C object CMakeFiles/rtthread.elf.dir/packages/CoreMark-latest/core_matrix.c.obj[ 11%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/libcpu/arm/common/showmem.c.obj[ 13%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/libcpu/arm/common/div0.c.obj[ 14%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/libcpu/arm/common/backtrace.c.obj[ 15%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/libcpu/arm/cortex-m4/cpuport.c.obj[ 17%] Building ASM object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/libcpu/arm/cortex-m4/context_gcc.S.obj[ 18%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/components/drivers/misc/pin.c.obj[ 20%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/components/drivers/serial/serial.c.obj[ 21%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/components/drivers/src/dataqueue.c.obj[ 23%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/components/drivers/src/ringblk_buf.c.obj[ 24%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/components/drivers/src/ringbuffer.c.obj[ 26%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/components/drivers/src/waitqueue.c.obj[ 27%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/components/drivers/src/completion.c.obj[ 28%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/components/drivers/src/pipe.c.obj[ 30%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/components/drivers/src/workqueue.c.obj[ 31%] Building ASM object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/bsp/stm32/libraries/STM32L4xx_HAL/CMSIS/Device/ST/STM32L4xx/Source/Templates/gcc/startup_stm32l496xx.s.objclang: warning: argument unused during compilation: '-D HAVE_CCONFIG_H' [-Wunused-command-line-argument]clang: warning: argument unused during compilation: '-D RT_USING_NEWLIB' [-Wunused-command-line-argument]clang: warning: argument unused during compilation: '-D STM32L496xx' [-Wunused-command-line-argument]clang: warning: argument unused during compilation: '-D USE_HAL_DRIVER' [-Wunused-command-line-argument]clang: warning: argument unused during compilation: '-D __RTTHREAD__' [-Wunused-command-line-argument][ 33%] Building C object CMakeFiles/rtthread.elf.dir/board/CubeMX_Config/Src/stm32l4xx_hal_msp.c.obj[ 34%] Building C object CMakeFiles/rtthread.elf.dir/board/board.c.obj[ 36%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/bsp/stm32/libraries/HAL_Drivers/drv_gpio.c.obj[ 37%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/bsp/stm32/libraries/HAL_Drivers/drv_usart.c.obj[ 39%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/bsp/stm32/libraries/HAL_Drivers/drv_common.c.obj[ 40%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/components/finsh/shell.c.obj[ 42%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/components/finsh/msh.c.obj[ 43%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/components/finsh/cmd.c.obj[ 44%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/src/idle.c.obj[ 46%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/src/kservice.c.obj[ 47%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/src/scheduler.c.obj[ 49%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/src/irq.c.obj[ 50%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/src/timer.c.obj[ 52%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/src/mempool.c.obj[ 53%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/src/ipc.c.obj[ 55%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/src/device.c.obj[ 56%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/src/clock.c.obj[ 57%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/src/thread.c.obj[ 59%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/src/mem.c.obj[ 60%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/src/components.c.obj[ 62%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/src/object.c.obj[ 63%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/components/libc/compilers/common/stdlib.c.obj[ 65%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/components/libc/compilers/common/time.c.obj[ 66%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/components/libc/compilers/gcc/newlib/syscalls.c.obj[ 68%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/components/libc/compilers/gcc/newlib/libc_syms.c.obj[ 69%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/bsp/stm32/libraries/STM32L4xx_HAL/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_cryp.c.obj[ 71%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/bsp/stm32/libraries/STM32L4xx_HAL/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_uart.c.obj[ 72%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/bsp/stm32/libraries/STM32L4xx_HAL/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_usart.c.obj[ 73%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/bsp/stm32/libraries/STM32L4xx_HAL/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_cortex.c.obj[ 75%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/bsp/stm32/libraries/STM32L4xx_HAL/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_gpio.c.obj[ 76%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/bsp/stm32/libraries/STM32L4xx_HAL/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_dma.c.obj[ 78%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/bsp/stm32/libraries/STM32L4xx_HAL/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_pwr.c.obj[ 79%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/bsp/stm32/libraries/STM32L4xx_HAL/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_rcc_ex.c.obj[ 81%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/bsp/stm32/libraries/STM32L4xx_HAL/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_rcc.c.obj[ 82%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/bsp/stm32/libraries/STM32L4xx_HAL/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_dma_ex.c.obj[ 84%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/bsp/stm32/libraries/STM32L4xx_HAL/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_exti.c.obj[ 85%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/bsp/stm32/libraries/STM32L4xx_HAL/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_crc.c.obj[ 86%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/bsp/stm32/libraries/STM32L4xx_HAL/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal.c.obj[ 88%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/bsp/stm32/libraries/STM32L4xx_HAL/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_usart_ex.c.obj[ 89%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/bsp/stm32/libraries/STM32L4xx_HAL/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_uart_ex.c.obj[ 91%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/bsp/stm32/libraries/STM32L4xx_HAL/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_crc_ex.c.obj[ 92%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/bsp/stm32/libraries/STM32L4xx_HAL/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_comp.c.obj[ 94%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/bsp/stm32/libraries/STM32L4xx_HAL/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_pwr_ex.c.obj[ 95%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/bsp/stm32/libraries/STM32L4xx_HAL/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_rng.c.obj[ 97%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/bsp/stm32/libraries/STM32L4xx_HAL/CMSIS/Device/ST/STM32L4xx/Source/Templates/system_stm32l4xx.c.obj[ 98%] Building C object CMakeFiles/rtthread.elf.dir/D_/repo/github/rt-thread/bsp/stm32/libraries/STM32L4xx_HAL/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_cryp_ex.c.obj[100%] Linking C executable rtthread.elfclang: warning: argument unused during compilation: '-Wa,-mimplicit-it=thumb' [-Wunused-command-line-argument]text data bss dec hex filename117152 2864 1844 121860 1dc04 rtthread.elf[100%] Built target rtthread.elf
下载 bin 文件到开发板：
- llvm 的编译下载就完成啦。
跑分测试
使用 LLVM、GCC、IAR 三种工具链编译出来的可执行文件，测试一下跑分情况：
GCC 5.4.1
优化等级：-Os
GCC 10.3.1
优化等级：-Os
LLVM
优化等级：-Os
IAR
优化等级：
IAR 跑分情况
MDK
优化等级：
MDK AC6 跑分情况
跑分排名
IAR （199.94） > MDK AC6 (160.74) > LLVM (159.24) > GCC 5.4.1 (143.1.8) > GCC 10.3.1 (136.48)
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改成
就可以使用 env 自带的 make 命令编译了。
@来一颗糖 唐大佬，太强了！🤩🤩🤩🤩🤩🤩
是时候向llvm迁移了，性能紧贴AC6
必须用
使用命令 scons —target=cmake 生成 CMakelists.txt 文件
生成CMakelists.txt文件嘛？
@liuduanfei 你也可以自己写 CMakelists.txt
@Papalymo 我的意思是不能直接像gcc那样用嘛 在python脚本改好链接
@liuduanfei 肯定可以啊，一会改下试试
@liuduanfei 简单改了下，能用了：https://gitee.com/guozhanxin/rt-thread/commit/da6846f3ccfa843b4163309a683cde8ddbae3de8
有个已知问题，llvm 和 gcc 的链接脚本好像不那么兼容，或者高版本的问题，反正会导致编译 fal 的时候，报
大佬有关注不同编译器编译出来的镜像的大小吗？
@youshenmebutuo 没有，主要测了一下性能
工具已经升级到16版本了，编译出来的固件和mdk5的固件大小差不多，效率也很好，只是国内用的人并不多，能找到的资料更少，实测-os情况下比arm-none-gcc快不少