将我的主机 PC 升级到更新的 Linux 版本后，我无法再运行我的项目。我只想编写一个工作电子板的副本：硬件和代码之前已经过验证。
更准确地说，代码在启动脚本中崩溃_libc_init_array并跳转到BusFault_Handler()或HardFault_Handler()。
我在论坛上阅读了很多，似乎与链接到错误的 libc 风格（Thumb vs. ARM）有关。
工具 ：
- 代码生成：STM32CubeMX
- 编译器：GNU GCC 8.2.1 版（8-2018-q4-major）
- IDE：Qt 创建者
- 构建系统：Qbs（Qt 的工具）
MCU 是 STM32L476RG，Cortex-M4，ARM v7e-m，带 FPU。在 GNU GCC 安装文件夹中，share/doc/gcc-arm-none-eabi/readme.txt告诉我需要哪些标志：
|------------|------------------------------------ --------|--------------| | 皮质-M4 | -mthumb -mcpu=cortex-m4 -mfloat-abi=softfp | 拇指 | | （软FP）| -mfpu=fpv4-sp-d16 | /v7e-m+fp | | |--------------------------------------------| /softfp | | | -mthumb -march=armv7e-m -mfloat-abi=softfp | | | | -mfpu=fpv4-sp-d16 | | |------------|------------------------------------ --------|--------------| | 皮质-M4 | -mthumb -mcpu=cortex-m4 -mfloat-abi=hard | 拇指 | | （硬FP）| -mfpu=fpv4-sp-d16 | /v7e-m+fp | | |--------------------------------------------| /硬 | | | -mthumb -march=armv7e-m -mfloat-abi=hard | | | | -mfpu=fpv4-sp-d16 | | |------------|------------------------------------ --------|--------------|
仅-mfloat-abi=softfp有效，无效-mfloat-abi=hard，但 GCC 文档表明结果是相同的；只有调用约定不同。
这是我的 Qbs 文件：
import qbs
CppApplication {
consoleApplication: true
property string family: "STM32L4xx"
property string linkerScript: "STM32L476RGTx_FLASH.ld"
cpp.positionIndependentCode: false // make sure option -fPIC is not passed to GCC
cpp.defines: [
"USE_HAL_DRIVER",
"STM32L476xx",
"__weak=__attribute__((weak))",
"__packed=__attribute__((__packed__))"
]
cpp.commonCompilerFlags: [
"-fno-common",
"-specs=nosys.specs",
"-specs=nano.specs",
"-march=armv7e-m",
"-mcpu=cortex-m4",
"-mthumb-interwork", // support ARM and Thumb instruction sets
"-mthumb",
"-mfloat-abi=softfp",
"-mfpu=fpv4-sp-d16",
"-mtune=cortex-m4", // tune performance of code for this processor
// "-std=c99",
"-ffunction-sections",
"-fdata-sections",
// "-Os",
"-O0",
"-g3",
"-Wall",
"-c", // don't run the linker
// "-v" // print a lot of details (too much ?)
]
cpp.linkerFlags: [
"-T"+path+"/"+linkerScript,
"--gc-sections", // fixes "undefined reference to _exit" error
"-Map="+buildDirectory+"/memory.map", // file created at the end of the link step
"-static",
"--verbose", // displays library search
// "-lgcc",
// "-lg",
// "-lm"
]
cpp.includePaths: [
"Inc",
"Drivers/CMSIS/Include",
"Drivers/CMSIS/Device/ST/"+family+"/Include",
"Drivers/STM32L4xx_HAL_Driver/Inc",
"Middlewares/ST/STM32_USB_Device_Library/Class/CDC/Inc",
"Middlewares/ST/STM32_USB_Device_Library/Core/Inc/"
]
files: [
"Inc/*.h",
linkerScript,
"Src/*.c",
"Drivers/CMSIS/Device/ST/"+family+"/Include/*.h",
"Drivers/CMSIS/Device/ST/"+family+"/Source/Templates/gcc/*.s",
"Drivers/CMSIS/Device/ST/"+family+"/Source/Templates/*.c",
"Drivers/CMSIS/Include/*.h",
"Drivers/"+family+"_HAL_Driver/Inc/*.h",
"Drivers/"+family+"_HAL_Driver/Src/*.c",
"Middlewares/ST/STM32_USB_Device_Library/Class/CDC/Src/*.c",
"Middlewares/ST/STM32_USB_Device_Library/Core/Src/*.c"
]
Properties {
condition: qbs.buildVariant === "debug"
cpp.defines: outer.concat(["DEBUG=1"])
}
Group { // Properties for the produced executable
fileTagsFilter: product.type
qbs.install: true
}
}
链接器--verbose选项允许它打印它链接到的库的完整路径。它总是解析为arm-none-eabi/lib/libc.a. 但我本来会期待arm-none-eabi/lib/thumb/v7e-m+fp/softfp/libc.a的。
我还尝试了将链接器选项-nostdlib与-Lflag 结合使用，但没有效果。即使我省略它也会编译-L，但根据 GCC 手册页，它不应该。
所以，我很困在这里。5 分钟的工作变成了几天……