TI CGT ARMLLVM 1.0.0 STS linker retains stdio symbols whenever C++ virtual methods are used

Stuart Baker

I'm experiencing an issue where my build performs fully as expected when I don't use C++ virtual methods. As soon as I use a single virtual method, the compiler starts retaining all of the stdio symbols (printf, fputs, etc...) adding ~4K of .text code size to my project. My project is quite small (~1K of .text), and I have verified that there are no references to any stdio methods in my code. This also occurs if the virtual method(s) are empty functions.

Thanks,

Stuart

over 3 years ago

0 LeonardEllis over 3 years ago

TI__Guru 71536 points

Hello Stuart,

Please indicate what processor you are using.

Thanks,

~Leonard

0 Stuart Baker over 3 years ago in reply to LeonardEllis

TI__Genius 10380 points

Cortex-M0+

0 George Mock over 3 years ago in reply to Stuart Baker

TI__Guru**** 239160 points

I am unable to reproduce the problem. Is your code organized as a CCS project? If so, please follow the directions in the article Sharing projects to zip up the project. Then either attach it to your next post, or send it to me privately.

Thanks and regards,

-George

0 George Mock over 3 years ago in reply to George Mock

TI__Guru**** 239160 points

Thank you for privately supplying a test case. I am able to reproduce the same results. I filed EXT_EP-10217 to have this investigated. You are welcome to follow it with that link.

Thanks and regards,

-George

0 Stuart Baker over 3 years ago in reply to George Mock

TI__Genius 10380 points

The compiler team is working on a fix for the next release. A temporary workaround is to override the library definition of __cxa_pure_virtual():

extern "C" {
void __cxa_pure_virtual()
{
    abort();
}
} // extern "C"

Thanks,

Stuart

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TI CGT ARMLLVM 1.0.0 STS linker retains stdio symbols whenever C++ virtual methods are used