• State Not Answered
  • Locked Locked
  • Replies 2 replies
  • Subscribers 23 subscribers
  • Views 13442 views
  • Users 0 members are here
2025 survey

We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.

Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Linking with arm-none-eabi-gcc instead of arm-none-eabi-ld

DavidAl

I am working with a small sample project that targets Cortex-M4 using the gcc arm-none-eabi toolchain.  The makefile invokes arm-none-eabi-ld directly to link the executable:

LD=arm-none-eabi-ld.exe
$(LD) main.o retarget.o exceptions.o test_main.o common.o init_main.o -T link.ld --print-memory-usage -o $(TARGET)
I want to replace the makefile with one generated by CMake.  CMake always uses arm-none-eabi-gcc for the linker stage. My understanding is that arm-none-eabi-gcc calls arm-none-eabi-ld implicitly to do the actual linking.
My problem is that the CMake script isn't working so I tried running the linker steps manually.
If I use arm-none-eabi-ld explicitly, the linking works.  But if I use arm-none-eabi-gcc the linking fails:

 

$ arm-none-eabi-gcc -v CMakeFiles/wdt_interrupt_gnu.dir/main.c.obj CMakeFiles/wdt_interrupt_gnu.dir/retarget.c.obj CMakeFiles/wdt_interrupt_gnu.dir/exceptions.c.obj CMakeFiles/wdt_interrupt_gnu.dir/test_main.c.obj CMakeFiles/wdt_interrupt_gnu.dir/common.c.obj CMakeFiles/wdt_interrupt_gnu.dir/init_main.c.obj -T ../link_cmake.ld -o cm4.axf
<snip>
/home/asic/lib/ARM/gcc-arm-none-eabi-10.3-2021.10/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld: /home/asic/lib/ARM/gcc-arm-none-eabi-10.3-2021.10/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/lib/libc.a(lib_a-exit.o): in function `exit':
exit.c:(.text.exit+0x2c): undefined reference to `_exit'
collect2: error: ld returned 1 exit status

Do I need to pass arm-none-eabi-ld explicitly as a parameter to arm-none-eabi-gcc?




Parents
  • 0

    I've gotten the error about undefined "_exit";   I usually just create an _exit() function (which hopefully is never called, anyway.)

    I'm not sure why running ld instead of gcc as the linker would cause it to work - probably you're somehow getting a different libc/libgcc/whatever.  Is the path that it's picking up (/home/asic/lib/ARM/gcc-arm-none-eabi-10.3-2021.10/bin/) the same one where it is picking up arm-none-eabi-ld.exe ?  Does your makefile set an environment variables?  (what happens if you you put "LD=arm-none-eabi-gcc.exe" in the Makefile?  (wait!  Is this on two completely different computers??  (one windows and one linux?)

Reply
  • 0

    I've gotten the error about undefined "_exit";   I usually just create an _exit() function (which hopefully is never called, anyway.)

    I'm not sure why running ld instead of gcc as the linker would cause it to work - probably you're somehow getting a different libc/libgcc/whatever.  Is the path that it's picking up (/home/asic/lib/ARM/gcc-arm-none-eabi-10.3-2021.10/bin/) the same one where it is picking up arm-none-eabi-ld.exe ?  Does your makefile set an environment variables?  (what happens if you you put "LD=arm-none-eabi-gcc.exe" in the Makefile?  (wait!  Is this on two completely different computers??  (one windows and one linux?)

Children
No data