링크 된 라이브러리에있는 함수가 실행 파일에 표시되지 않습니다.

Question

cmake를 사용하여 stm32f4 용 FreeRTOS 프로젝트를 컴파일하려고합니다. syscalls.c를 연결하는 것 외에는 모든 것이 원활하게 진행됩니다.

프로젝트 구조는 다음과 같습니다 src 폴더에없는

Everyting 정적 라이브러리 즉 SPL, 시작 파일, FreeRTOS로 컴파일 등 내 마지막 컴파일 단계입니다 :

[100%] Linking C executable bin/stm32f4_template.elf 

/home/kript0n/Applications/EmbeddedArm/gcc-arm-none-eabi-4_9-2015q2/bin/arm-none-eabi-gcc 
-mcpu=cortex-m4 -mthumb -mfloat-abi=hard -mfpu=fpv4-sp-d16 -march=armv7e-m -fsingle-precision-constant 
-finline-functions -Wdouble-promotion -std=gnu99 -Os -g -Wall -ffunction-sections 
-fdata-sections -specs=nano.specs -u _scanf_float -u printf_float -fno-exceptions 
-Wl,--gc-sections,-T/home/kript0n/Documents/projects/STM32F4-FreeRTOS/Utilities/stm32_flash.ld, 
-Map,/home/kript0n/Documents/projects/STM32F4-FreeRTOS/build/bin/stm32f4_template.elf.map 
CMakeFiles/stm32f4_template.elf.dir/src/main.c.obj CMakeFiles/stm32f4_template.elf.dir/src/controller.c.obj -o bin/stm32f4_template.elf 
Libraries/STM32F4xx_StdPeriph_Driver/libdriverlib.a FreeRTOS/libFreeRTOS.a hardware/libhardware.a -lm Libraries/TM/libtm.a Libraries/syscall/libsyscalls.a 

그리고 출력 :

/home/kript0n/Applications/EmbeddedArm/gcc-arm-none-eabi-4_9-2015q2/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/armv7e-m/fpu/libg_nano.a(lib_a-sbrkr.o): In function `_sbrk_r': 
sbrkr.c:(.text._sbrk_r+0xc): undefined reference to `_sbrk' 
/home/kript0n/Applications/EmbeddedArm/gcc-arm-none-eabi-4_9-2015q2/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/armv7e-m/fpu/libg_nano.a(lib_a-writer.o): In function `_write_r': 
writer.c:(.text._write_r+0x10): undefined reference to `_write' 
/home/kript0n/Applications/EmbeddedArm/gcc-arm-none-eabi-4_9-2015q2/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/armv7e-m/fpu/libg_nano.a(lib_a-closer.o): In function `_close_r': 
closer.c:(.text._close_r+0xc): undefined reference to `_close' 
/home/kript0n/Applications/EmbeddedArm/gcc-arm-none-eabi-4_9-2015q2/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/armv7e-m/fpu/libg_nano.a(lib_a-fstatr.o): In function `_fstat_r': 
fstatr.c:(.text._fstat_r+0xe): undefined reference to `_fstat' 
/home/kript0n/Applications/EmbeddedArm/gcc-arm-none-eabi-4_9-2015q2/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/armv7e-m/fpu/libg_nano.a(lib_a-isattyr.o): In function `_isatty_r': 
isattyr.c:(.text._isatty_r+0xc): undefined reference to `_isatty' 
/home/kript0n/Applications/EmbeddedArm/gcc-arm-none-eabi-4_9-2015q2/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/armv7e-m/fpu/libg_nano.a(lib_a-lseekr.o): In function `_lseek_r': 
lseekr.c:(.text._lseek_r+0x10): undefined reference to `_lseek' 
/home/kript0n/Applications/EmbeddedArm/gcc-arm-none-eabi-4_9-2015q2/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/armv7e-m/fpu/libg_nano.a(lib_a-readr.o): In function `_read_r': 
readr.c:(.text._read_r+0x10): undefined reference to `_read' 
collect2: error: ld returned 1 exit status 
CMakeFiles/stm32f4_template.elf.dir/build.make:126: recipe for target 'bin/stm32f4_template.elf' failed 
make[2]: *** [bin/stm32f4_template.elf] Error 1 

syscalls.c가 링크되어있는 것을 볼 수 있듯이 시스템 호출은 여전히 ​​발견되지 않습니다.

#include <stdlib.h> 
#include <errno.h> 
#include <string.h> 
#include <sys/stat.h> 
#include <sys/types.h> 

#include "stdio.h" 
#include "stm32f4xx_usart.h" 

/***************************************************************************/ 

int _open(const char *name, int flags, int mode){ 
    return -1; 
} 

int _read(int file, char * ptr, int len) { 
    ptr = ptr; 
    len = len; 
    errno = EINVAL; 
    return -1; 
} 

/***************************************************************************/ 

int _lseek(int file, int ptr, int dir) { 
    file = file; 
    ptr = ptr; 
    dir = dir; 
    return 0; 
} 

/***************************************************************************/ 

int _write(int file, char * ptr, int len) { 
    int index; 
    if (!ptr) { 
    return 0; 
    } 
    for (index = 0; index < len; index++) { 
    while (!(USART3->SR & 0x00000040)); 
    USART_SendData(USART3, ptr[index]); 
    } 
    return len; 
} 

/***************************************************************************/ 

int _close(int file) { 
    return 0; 
} 

/***************************************************************************/ 

/* Register name faking - works in collusion with the linker. */ 
register char * stack_ptr asm ("sp"); 

caddr_t _sbrk(int incr) { 
    extern char end asm ("end"); // Defined by the linker. 
    static char * heap_end; 
    char *  prev_heap_end; 
    if (heap_end == NULL) 
    heap_end = & end; 
    prev_heap_end = heap_end; 
    if (heap_end + incr > stack_ptr) { 
    // Some of the libstdc++-v3 tests rely upon detecting 
    // out of memory errors, so do not abort here. 
#if 0 
    extern void abort (void); 
    _write (1, "_sbrk: Heap and stack collision\n", 32); 
    abort(); 
#else 
    errno = ENOMEM; 
    return (caddr_t) -1; 
#endif 
    } 
    heap_end += incr; 
    return (caddr_t) prev_heap_end; 
} 

/***************************************************************************/ 

int _fstat(int file, struct stat * st) { 
    file = file; 
    memset (st, 0, sizeof (* st)); 
    st->st_mode = S_IFCHR; 
    return 0; 
} 

/***************************************************************************/ 

int _isatty(int fd) { 
    fd = fd; 
    return 1; 
} 

int _kill(int pid, int sig) { 
    errno=EINVAL; 
    return(-1); 
} 

int _getpid(void) { 
    return 1; 
} 

그리고 그 '건물 단계 : 여기 syscalls.c의 내용과 누락 된 모든 기능을 내부 선물됩니다

[ 85%] Building C object Libraries/syscall/CMakeFiles/syscalls.dir/syscalls.c.obj 
cd /home/kript0n/Documents/projects/STM32F4-FreeRTOS/build/Libraries/syscall && /home/kript0n/Applications/EmbeddedArm/gcc-arm-none-eabi-4_9-2015q2/bin/arm-none-eabi-gcc -DARM_MATH_CM4 -DHSE_VALUE=8000000 -DSTM32F40_41xxx -DSTM32F4XX -DUSESTD_PERIPH_DRIVER -D__FPU_PRESENT=1 -D__FPU_USED=1 -I/home/kript0n/Documents/projects/STM32F4-FreeRTOS/Libraries/CMSIS/Device/ST/STM32F4xx/Include -I/home/kript0n/Documents/projects/STM32F4-FreeRTOS/Libraries/CMSIS/Include -I/home/kript0n/Documents/projects/STM32F4-FreeRTOS/Libraries/STM32F4xx_StdPeriph_Driver/inc -I/home/kript0n/Documents/projects/STM32F4-FreeRTOS/Libraries/TM/TM_SPL -I/home/kript0n/Documents/projects/STM32F4-FreeRTOS/FreeRTOS/include -I/home/kript0n/Documents/projects/STM32F4-FreeRTOS/FreeRTOS/portable/GCC/ARM_CM4F -I/home/kript0n/Documents/projects/STM32F4-FreeRTOS/config -I/home/kript0n/Documents/projects/STM32F4-FreeRTOS/hardware -I/home/kript0n/Documents/projects/STM32F4-FreeRTOS/include -mcpu=cortex-m4  -mthumb  -mfloat-abi=hard  -mfpu=fpv4-sp-d16  -march=armv7e-m  -fsingle-precision-constant  -finline-functions  -Wdouble-promotion  -std=gnu99  -Os  -g  -Wall  -ffunction-sections  -fdata-sections  -specs=nano.specs -o CMakeFiles/syscalls.dir/syscalls.c.obj -c /home/kript0n/Documents/projects/STM32F4-FreeRTOS/Libraries/syscall/syscalls.c 
[ 89%] Linking C static library libsyscalls.a 
cd /home/kript0n/Documents/projects/STM32F4-FreeRTOS/build/Libraries/syscall && /usr/bin/cmake -P CMakeFiles/syscalls.dir/cmake_clean_target.cmake 
cd /home/kript0n/Documents/projects/STM32F4-FreeRTOS/build/Libraries/syscall && /usr/bin/cmake -E cmake_link_script CMakeFiles/syscalls.dir/link.txt --verbose=1 
/home/kript0n/Applications/EmbeddedArm/gcc-arm-none-eabi-4_9-2015q2/bin/arm-none-eabi-ar qc libsyscalls.a CMakeFiles/syscalls.dir/syscalls.c.obj 
/home/kript0n/Applications/EmbeddedArm/gcc-arm-none-eabi-4_9-2015q2/bin/arm-none-eabi-ranlib libsyscalls.a 
make[2]: Leaving directory '/home/kript0n/Documents/projects/STM32F4-FreeRTOS/build' 
[ 89%] Built target syscalls 

그 파일을 라이브러리로 컴파일 것을, 기능을 제시하고 그것은 연결되어 있습니다. 그래서 그게 잘못된거야?

감사합니다.

Answer 1

어떤 심볼을 링크 할 것인지를 결정하는 규칙과 링커에서 삭제하지 않는 기호는 언제 사용되며 독립 객체 파일과 라이브러리에서 어느 정도 다릅니다. 신중하게 링커 명령 행을 재정렬하면 문제가 해결 될 수 있습니다.

나는 그것에 대해 걱정하는 것을 멈추었으며, 드롭 된 기능을 '사용한'것으로 표시했습니다.

#define USED __attribute__ ((used)) 
#define UU __attribute__((unused)) 

int USED _close(int x UU) { 
    return -1; 
} 

int USED _fstat(int file UU, struct stat *st) { 
    st->st_mode = S_IFCHR; 
    return 0; 
}