[SOLVED] Unable to link additional lib file (libc.a etc)

nibbly78 · Dec 12th 2022, 10:00am

I have a project that requires libc.a. I know this because when I try to build it, I get the following error at linking stage :-
cannot find libc.a: No such file or directory.

I tried a few of the examples on the forum to try and add a path to the library files but none of them work.

What I have at the moment is, Settings->Library Include Standard Libraries set to NO & and added the path to libc.a in Settings->Linker Aditional Input Files set to $(ProjectDir)/libs.

Only way I could get it to work is to copy libc.a to the root dir of my solution????

Please, how do I add libraries to my project the proper way without manually scavenging lib files and pasting them into root of my project dir?

Oh, I also tried following a guide (looked way too simple to actually work) that made SES use GCC compiler installed separately but that didn't work either...

I'm using SES release 7.10 on windows 10

nibbly78 · Dec 12th 2022, 12:26pm

Ok, did some more digging. Turns out libc.a is in location C:\Program Files\SEGGER\SEGGER Embedded Studio for ARM 7.10\lib

So, simply having Settings->Library Include Standard Libraries set to YES should be sufficient but still get same error.
I also made sure the path was set up correctly which is as follows :- $(StudioLibDir:$(StudioDir)/lib) for Settings->Library Include Standard Libraries Directory

Lastly, as a test, I treated libc.a as if it were a .c file and added it to my project but that complained that it could not be found as well (find that hard to believe...)

SEGGER - Lucas · Dec 19th 2022, 12:06pm

Hi nibbly78,

Thank you for your inquiry.
Such an issue is not known to us.
Could you provide us with a sample project for reproduction?

Regards,
Lucas

nibbly78 · Dec 20th 2022, 3:41pm

Hi, ok, I've attached the project.

Regards

SEGGER - Lucas · Jan 13th 2023, 10:43am

Hello nibbly78,

Thank you for providing the project.
The described behavior is caused by a error in your linker script, which seems to come from a third party IDE.
To avoid the Linker error, simply remove the following lines of your linker script.

Source Code

/DISCARD/ :
{
libc.a ( * )
libm.a ( * )
libgcc.a ( * )
}

For more information about the linker script syntax, see the GNU Linker Manual.

However, we recommend that you create a new project in Embedded Studio using the project wizard and add your sources to it.
With our CPU Support Packages we offer a project template to create projects directly for the desired device which additionaly set up the SEGGER IDE + toolchain correctly including any libraries etc.
Here you can find a video explaining how to install CPU Support Packages: segger.com/products/developmen…logy/cpu-support/#gallery
After that, simply create a new project and use the right template for your device, which was installed with the CPU Support Package.
How is shown in the following video: segger.com/products/developmen…ect-management/#gallery-1

On an additional note we saw that the project you provided is meant to be a bootloader project. We have some good news for you there, because we have posted an article in our wiki which explains how to create a solution with bootloader and application in Embedded Studio for a pretty much identical device: wiki.segger.com/Creating_a_sol…ootloader_and_application
So we recommended to use that guide at least for inspiration to get a good feeling on how to most efficiently work with Embedded Studio.

Best regards,
Lucas

nibbly78 · Jan 18th 2023, 3:15pm

Ahhh, Many thanks Lucas

Source Code

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