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I'm getting this error message when I tried to compile "respknt" program under Rosetta 2 on my macOS-arm64 (apple silicon/M1 chip):

gfortran -g runtest.o runcmd.o -o bin//runtest

ld: warning: ignoring file runtest.o, building for macOS-arm64 but attempting to link with file built for macOS-x86_64

ld: warning: ignoring file runcmd.o, building for macOS-arm64 but attempting to link with file built for macOS-x86_64

Undefined symbols for architecture arm64: "_main", referenced from:

 implicit entry/start for main executable

ld: symbol(s) not found for architecture arm64

collect2: error: ld returned 1 exit status

make: *** [runtest] Error 1.

Please note that, "respknt" is a seismological software that is built on reflection matrix method of Kenneth 1986.

I switched the architecture on my Mac terminal from arm64 to MacOS x86_64 to test if I could compile the "respknt" program. I even verified if I have switched the architecture to MacOS x86_64 by invoking the "gcc -v" command:

Apple clang version 14.0.0 (clang-1400.0.29.202)

Target: x86_64-apple-darwin22.3.0 Thread model: posix

InstalledDir: /Library/Developer/CommandLineTools/usr/bin.

Also, I got "i386" when I invoked "arch" command.

I would appreciate it if you could tell me what I'm doing wrong. Thank you for your time!

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  • This question is similar to: What is an undefined reference/unresolved external symbol error and how do I fix it?. If you believe it’s different, please edit the question, make it clear how it’s different and/or how the answers on that question are not helpful for your problem. (Also see stackoverflow.com/q/70057202/62576). Please always search for error messages before posting. This question has been asked many, many times before.) Commented Aug 16, 2024 at 1:06
  • The relevant portion of the error you posted is in Undefined symbols for architecture arm64: "_main". Commented Aug 16, 2024 at 1:10
  • How were runtest.o and runcmd.o compiled? Are you using that GitHub repo that has object files and .DS_Store committed? If so, then my guess is that your gfortran is actually arm64-only and cannot produce Intel binaries. Commented Aug 16, 2024 at 3:14
  • @KenWhite different issue. The OP is neither failing to link against a library nor to supply the relevant object files on the command line - the error is due to the linker skipping the provided object files because there seems to be some mismatch on the selected target architecture. Commented Aug 16, 2024 at 3:15
  • @Siguza: Then please explain to me why a gold badge user used it as a reason to close this question that contains the same exact error message. Commented Aug 16, 2024 at 3:20
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