MCUXpresso GeneralのトピックRe: Compiler unused code/data removal

Compiler unused code/data removal

gschelotto — Fri, 02 Aug 2019 14:45:11 GMT

Hi,

I usually use (at the end of the development) a compiler option that removes unused data/code. From Atollic toolchain for ST here's the option to activate it.

Where can I find these options on MCUxpresso?

regards,

gaston

Re: Compiler unused code/data removal

converse — Fri, 02 Aug 2019 20:04:54 GMT

AFAIK, MCUXpresso has this option set automatically for Release builds.

See https://community.nxp.com/thread/389145

Re: Compiler unused code/data removal

BlackNight — Sat, 03 Aug 2019 03:45:26 GMT

This is about grouping code and data items into single sections:

-ffunction-sections -fdata-sections

They should be set by default already in the SDK projects:

And for the linker to remove unused ones:

--gc-sections

I hope this helps,

Erich

Re: Compiler unused code/data removal

embeddeddavid — Fri, 27 Sep 2019 09:51:54 GMT

Hi there,

-ffunction-sections and -fdata-sections MCU compiler flags are set in my project; and also --gc-sections MCU linker flag. However, lots of unused standard functions are linked to my application, such as read_r, _realloc_r, etc.

The build configuration is using my own linker script and I have unchecked 'Do not use default libraries (-nodefaultlibs)' at Tool Settings >> MCU Linker >> General

Any clue of what can be happening here?

Thanks in advance!

Re: Compiler unused code/data removal

converse — Fri, 27 Sep 2019 13:45:44 GMT

Attach you map file. This may give some clues

Re: Compiler unused code/data removal

embeddeddavid — Mon, 30 Sep 2019 08:24:18 GMT

I'm sorry but I can't provide this information.

Re: Compiler unused code/data removal

converse — Mon, 30 Sep 2019 16:43:48 GMT

I’m sorry, but I can’t help without it.