Posted by PeterLustiger on 2016-04-05 15:01

Hi,
i try to build a main.cpp. i created a new cpp project. the compiler works well - but the c++ linker is not able to linke some of the libc functions.
is someone able to help with a solution for this problem?
thanks!

‘Invoking: MCU G++ Linker’
arm-none-eabi-g++ -mcpu=cortex-m7 -mthumb -mfloat-abi=hard -mfpu=fpv5-sp-d16 -L”c:/ac6/systemworkbench/plugins/fr.ac6.mcu.externaltools.arm-none.win32_1.3.0.201507241045/tools/compiler/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/cortex-m7/fpu/fpv5-sp-d16\libc.a” -T”D:\Develop\WorkSpc\firmware\STM32\dev\AC6_STM32F7\LinkerScript.ld” -Wl,-Map=output.map -Wl,--gc-sections -fno-exceptions -fno-rtti -lm -o “AC6_STM32F7.elf” @”objects.list”
c:/ac6/systemworkbench/plugins/fr.ac6.mcu.externaltools.arm-none.win32_1.3.0.201507241045/tools/compiler/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/cortex-m7/fpu/fpv5-sp-d16\libc.a(lib_a-abort.o): In function `abort’:
abort.c:(.text.abort+0xa): undefined reference to `_exit’
c:/ac6/systemworkbench/plugins/fr.ac6.mcu.externaltools.arm-none.win32_1.3.0.201507241045/tools/compiler/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/cortex-m7/fpu/fpv5-sp-d16\libc.a(lib_a-signalr.o): In function `_kill_r’:
signalr.c:(.text._kill_r+0xe): undefined reference to `_kill’
c:/ac6/systemworkbench/plugins/fr.ac6.mcu.externaltools.arm-none.win32_1.3.0.201507241045/tools/compiler/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/cortex-m7/fpu/fpv5-sp-d16\libc.a(lib_a-signalr.o): In function `_getpid_r’:
signalr.c:(.text._getpid_r+0x0): undefined reference to `_getpid’
c:/ac6/systemworkbench/plugins/fr.ac6.mcu.externaltools.arm-none.win32_1.3.0.201507241045/tools/compiler/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/cortex-m7/fpu/fpv5-sp-d16\libc.a(lib_a-writer.o): In function `_write_r’:
writer.c:(.text._write_r+0x10): undefined reference to `_write’
c:/ac6/systemworkbench/plugins/fr.ac6.mcu.externaltools.arm-none.win32_1.3.0.201507241045/tools/compiler/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/cortex-m7/fpu/fpv5-sp-d16\libc.a(lib_a-closer.o): In function `_close_r’:
closer.c:(.text._close_r+0xc): undefined reference to `_close’
c:/ac6/systemworkbench/plugins/fr.ac6.mcu.externaltools.arm-none.win32_1.3.0.201507241045/tools/compiler/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/cortex-m7/fpu/fpv5-sp-d16\libc.a(lib_a-fstatr.o): In function `_fstat_r’:
fstatr.c:(.text._fstat_r+0xe): undefined reference to `_fstat’
c:/ac6/systemworkbench/plugins/fr.ac6.mcu.externaltools.arm-none.win32_1.3.0.201507241045/tools/compiler/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/cortex-m7/fpu/fpv5-sp-d16\libc.a(lib_a-isattyr.o): In function `_isatty_r’:
isattyr.c:(.text._isatty_r+0xc): undefined reference to `_isatty’
c:/ac6/systemworkbench/plugins/fr.ac6.mcu.externaltools.arm-none.win32_1.3.0.201507241045/tools/compiler/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/cortex-m7/fpu/fpv5-sp-d16\libc.a(lib_a-lseekr.o): In function `_lseek_r’:
lseekr.c:(.text._lseek_r+0x10): undefined reference to `_lseek’
c:/ac6/systemworkbench/plugins/fr.ac6.mcu.externaltools.arm-none.win32_1.3.0.201507241045/tools/compiler/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/cortex-m7/fpu/fpv5-sp-d16\libc.a(lib_a-readr.o): In function `_read_r’:
readr.c:(.text._read_r+0x10): undefined reference to `_read’
collect2.exe: error: ld returned 1 exit status’’