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1729 :: How to deactivate linking against libdl when cross compiling to AVR MCU?

[2015-10-21T15:41:39+02:00]

t3476 (orginal) [2015-10-21T15:41:39+02:00] view original

I got belows error message:
[Linking]
/usr/bin/avr-ld: cannot find -ldl

nim compiler implies linking against libdl but AVR don't need that library. With workaround, I can cross compile with --compileOnly option and then avr-gcc. Is there any way let nim compile it imediately?

By the way, What is panicoverride.nim actually for?

Araq (orginal) [2015-10-21T21:06:52+02:00] view original

Remove the -ldl from your configuration. panicoverride.nim is the way you tell the Nim compiler how to report out of bounds errors etc.

t3476 (orginal) [2015-10-21T22:31:52+02:00] view original

I didn't set -ldl in my configuration but nim still try to link it after compiling to c. It looks it's default behavior. How to unset this?

chrisheller (orginal) [2015-10-22T00:34:32+02:00] view original

Try adding this in your .cfg file.

gcc.options.linker = "-static"

t3476 (orginal) [2015-10-22T11:41:06+02:00] view original

gcc.options.linker = "-static"

It succeeds. Thanks for help.

But I'm not sure why. I guess that it figured out it didn't need libdl when it resolve libdl statically.

Araq (orginal) [2015-10-22T12:01:46+02:00] view original

Because it overrides the default gcc.options.linker? Please read this: http://nim-lang.org/docs/nimc.html#compiler-usage-configuration-files

Jehan (orginal) [2015-10-22T12:59:26+02:00] view original

To expand on what Araq said: Compiler/linker defaults are set in config/nim.cfg (and can be overridden in user and project config files). You can look at that file and see what the defaults for the various compilers/operating systems are. You will see that "-ldl" is the default for non-BSD Unixes.

t3476 (orginal) [2015-10-22T18:48:41+02:00] view original

Thanks for all the help, It passed compilation but I failed to make it more practical than compiling an empty nim source. AVR's library comes with a lot of macros and many vender-specific keywords which can not be translated seamlessly.

Araq (orginal) [2015-10-22T21:18:30+02:00] view original

They can, but you need to read about .codegenDecl and .emit.