英文:
arm-none-eabi-gcc "is not implemented and will always fail" messages
问题
这些编译器警告信息是由于某些函数（例如_close_r、_lseek_r、_read_r、_write_r）没有实现引起的，因此它们将始终失败。这些函数通常是与文件操作相关的，例如关闭文件、寻址文件、读取文件和写入文件。
在两个项目中，您使用了相同的编译选项和链接选项，这使得编译过程应该是相同的。然而，在一个项目中，您遇到了这些警告，而在另一个项目中没有。
可能的原因是在两个项目中使用的设备或配置存在一些差异。您提到在一个项目中使用了-DSTM32F103xE，而在另一个项目中使用了-DSTM32F103xB，这可能是其中一个潜在的区别。您可能需要检查这些宏定义和与它们相关的文件是否存在差异。
另外，您还提到这些问题可能在最近的更新后出现。如果您在两个项目中使用相同的编译器和库版本，但其中一个项目出现问题，那么问题可能源于特定于项目的配置或源代码差异。您可能需要详细比较两个项目的源代码和配置文件，以查找差异。
最后，还可以考虑执行更详细的调试，例如使用-E选项查看生成的预处理文件，以查看是否存在差异。如果问题仍然存在，您可能需要进一步调查特定于项目的配置或源代码文件。
英文:
I have two stm32 projects (one with stm32f103rb and the other with stm32f103re). Both projects are built using cmake and make based on stm32-cmake template and also use cubeMX HAL libraries. For both projects I use this printf library and overall structure of the source code and implemented functions are similar.
When I build the projects, I get these linker messages, but only in the 103re project and not the other one (both project build completely):
usr/lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/bin/ld: /usr/lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/lib/thumb/v7-m/nofp/libc_nano.a(libc_a-closer.o): in function `_close_r':
/build/arm-none-eabi-newlib/src/build-nano/arm-none-eabi/thumb/v7-m/nofp/newlib/../../../../../../newlib-4.3.0.20230120/newlib/libc/reent/closer.c:47: warning: _close is not implemented and will always fail
/usr/lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/bin/ld: /usr/lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/lib/thumb/v7-m/nofp/libc_nano.a(libc_a-lseekr.o): in function `_lseek_r':
/build/arm-none-eabi-newlib/src/build-nano/arm-none-eabi/thumb/v7-m/nofp/newlib/../../../../../../newlib-4.3.0.20230120/newlib/libc/reent/lseekr.c:49: warning: _lseek is not implemented and will always fail
/usr/lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/bin/ld: /usr/lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/lib/thumb/v7-m/nofp/libc_nano.a(libc_a-readr.o): in function `_read_r':
/build/arm-none-eabi-newlib/src/build-nano/arm-none-eabi/thumb/v7-m/nofp/newlib/../../../../../../newlib-4.3.0.20230120/newlib/libc/reent/readr.c:49: warning: _read is not implemented and will always fail
/usr/lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/bin/ld: /usr/lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/lib/thumb/v7-m/nofp/libc_nano.a(libc_a-writer.o): in function `_write_r':
/build/arm-none-eabi-newlib/src/build-nano/arm-none-eabi/thumb/v7-m/nofp/newlib/../../../../../../newlib-4.3.0.20230120/newlib/libc/reent/writer.c:49: warning: _write is not implemented and will always fail
What's the reason for these messages? and why the compiler behavior is different in two project?
PS: this wasn't the case couple of weeks ago and it happens recently probably after an update or something.
❮ pacman -Q | grep arm-none-eabi
arm-none-eabi-binutils 2.39-2
arm-none-eabi-gcc 12.2.0-1
arm-none-eabi-gdb 13.1-1
arm-none-eabi-newlib 4.3.0.20230120-1
Edit 1:
build flags, in gcc-arm-none-eabi.cmake module:
set(CMAKE_C_FLAGS_INIT
"-fdata-sections -ffunction-sections --specs=nano.specs --specs=nosys.specs -Wl,--gc-sections")
compile options in CMakeLists.txt:
target_compile_options(${EXECUTABLE} PRIVATE
${CPU_PARAMETERS}
-Wall
-Wextra
-Wpedantic
-Wshadow
-Wdouble-promotion
-Wformat=2 -Wformat-truncation
-Wundef
-fno-common
-Wno-unused-parameter
$<$<COMPILE_LANGUAGE:CXX>:
-Wconversion
-Wno-volatile
-Wold-style-cast
-Wuseless-cast
-Wsuggest-override>
$<$<CONFIG:Debug>:-Og -g3 -ggdb>
$<$<CONFIG:Release>:-Og -g0>)
and linker flags in CMakeLists.txt file:
target_link_options(${EXECUTABLE} PRIVATE
-T${MCU_LINKER_SCRIPT}
${CPU_PARAMETERS}
-Wl,-Map=${CMAKE_PROJECT_NAME}.map
-Wl,--start-group
-lc
-lm
-lnosys
-lstdc++
-Wl,--end-group
-Wl,--print-memory-usage)
All these options are identical in both files
Edit 2:
Output of make VERBOSE=1 for one of the source files in both projects. I checked with vimdiff and they are identical (except -DSTM32F103xE which is -DSTM32F103xB on the other project:
[ 3%] Building C object CMakeFiles/ap-v0.2-22-gd2cd.dir/Core/Src/dma.c.obj
/usr/bin/arm-none-eabi-gcc -DSTM32F103xE -DUSE_HAL_DRIVER -I/home/mehdi/wrk/code/ap -isystem /home/mehdi/wrk/code/ap/Core/Inc -isystem /home/mehdi/wrk/code/ap/Drivers/STM32F1xx_HAL_Driver/Inc -isystem /home/mehdi/wrk/code/ap/Drivers/STM32F1xx_HAL_Driver/Inc/Legacy -isystem /home/mehdi/wrk/code/ap/
Drivers/CMSIS/Device/ST/STM32F1xx/Include -isystem /home/mehdi/wrk/code/ap/Drivers/CMSIS/Include -fdata-sections -ffunction-sections --specs=nano.specs --specs=nosys.specs -Wl,--gc-sections -g -mcpu=cortex-m3 -mthumb -Wall -Wextra -Wpedantic -Wshadow -Wdouble-promotion -Wformat=2 -Wformat-truncati
on -Wundef -fno-common -Wno-unused-parameter -Og -g3 -ggdb -std=gnu11 -MD -MT CMakeFiles/ap-v0.2-22-gd2cd.dir/Core/Src/dma.c.obj -MF CMakeFiles/ap-v0.2-22-gd2cd.dir/Core/Src/dma.c.obj.d -o CMakeFiles/ap-v0.2-22-gd2cd.dir/Core/Src/dma.c.obj -c /home/mehdi/wrk/code/ap/Core/Src/dma.c
link command:
[100%] Linking C executable ap-v0.2-22-gd2cd.elf
/usr/bin/cmake -E cmake_link_script CMakeFiles/ap-v0.2-22-gd2cd.dir/link.txt --verbose=1
/usr/bin/arm-none-eabi-gcc -fdata-sections -ffunction-sections --specs=nano.specs --specs=nosys.specs -Wl,--gc-sections -g -T/home/mehdi/wrk/code/ap/CubeMX/STM32F103RETx_FLASH.ld -mcpu=cortex-m3 -mthumb -Wl,-Map=ap.map -Wl,--start-group -lc -lm -lnosys -lstdc++ -Wl,--end-group -Wl,--print-memory-u
sage "CMakeFiles/ap-v0.2-22-gd2cd.dir/Core/Src/dma.c.obj" ... all other sources
search results for _write_r in .map file:
in stm32f103rb project:
/usr/lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/lib/thumb/v7-m/nofp/libc_nano.a(libc_a-writer.o)
/usr/lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/lib/thumb/v7-m/nofp/libc_nano.a(libc_a-stdio.o) (_write_r)
.text._write_r
0x0000000008008c8c 0x24 /usr/lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/lib/thumb/v7-m/nofp/libc_nano.a(libc_a-writer.o)
0x0000000008008c8c _write_r
in stm32f103re project:
/usr/lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/lib/thumb/v7-m/nofp/libc_nano.a(libc_a-writer.o)
/usr/lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/lib/thumb/v7-m/nofp/libc_nano.a(libc_a-stdio.o) (_write_r)
.text 0x0000000000000000 0x0 /usr/lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/lib/thumb/v7-m/nofp/libc_nano.a(libc_a-writer.o)
.data 0x0000000000000000 0x0 /usr/lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/lib/thumb/v7-m/nofp/libc_nano.a(libc_a-writer.o)
.bss 0x0000000000000000 0x0 /usr/lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/lib/thumb/v7-m/nofp/libc_nano.a(libc_a-writer.o)
.text._write_r
答案1
得分: 1
以下是翻译好的部分：
这个警告消息定义在newlib-cygwin/libgloss/libnosys/warning.h文件中，作为一个.gnu.warning.*节(section)，你可以使用objcopy来移除它。
输入你的arm-none-eabi工具安装目录，使用以下命令：
find -name "libnosys.a" -exec arm-none-eabi-objcopy -R .gnu.warning.* {} \;
英文:
This warning message defined in newlib-cygwin/libgloss/libnosys
/warning.h , as a .gnu.warning.* section, you can remove it use objcopy.
Enter your arm-none-eabi tools install dir, use command:
find -name "libnosys.a" -exec arm-none-eabi-objcopy -R .gnu.warning.* {} \;
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