Is anyone using ARM's Launchpad gcc?

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Is anyone using ARM's Launchpad gcc?

(10 posts) (4 voices)

Started 2 years ago by gbulmer
Latest reply from crenn

gbulmer
Moderator

Is anyone using the ARM launchpad gcc 4.7 compiler: https://launchpad.net/gcc-arm-embedded

There are several options for code generation for the STM32F3/4, particularly for floating point.

There is also an option to do "Whole Program Optimisation". The GCC documentation says it offers smaller faster binaries through a further optimisation pass at link time. Does this work well? Is it reasonably quick? Does it remove dead-code? Any disadvantages?

What compile and link options are people, who have experimented with it, using?

Posted 2 years ago #
ala42
Member

This is what you get when using -flto
cc1.exe: error: LTO support has not been enabled in this configuration
Besides that 4.7.2 produced much better code than the codesourcery version I used before. It was that good that I had to add two nops in the micros function to make it work again :)
Current version is 4.7.4.
Dead code (non called functions) were already removed in older versions.

Posted 2 years ago #
crenn
Moderator

Currently I'm using that compiler for testing the orone mini f3 board. Seems to work well so far, but I haven't fiddled too much with it at this stage.

Posted 2 years ago #
ventosus
Member

I use that too for the F3 series. Although I have only added the flags to enable the floating point unit.

https://github.com/ventosus/libmaple/blob/F3/support/make/target-config.mk

@gbulmer, do you have a link to those magic optimisation options?

Posted 2 years ago #
gbulmer
Moderator

ala42 - Thank for the feedback. So LTO doesn't work. (Just to be clear, I assume you are using the ARM launchpad version.)

crenn - Thanks for the info. Best wishes for hacking the IDE :-)

It looks like we can all (relatively easily) be on or close to the same page :-)

ventosus - Thank you for the link. I will likely use that unaltered for consistency.

Might it be worth adding a small README to your "support" (or top-level) directory to say something like:
"The build system can use ARM launchpad gcc, retrieved from https://launchpad.net/gcc-arm-embedded"
So that we can point anyone who wants to use the F3 stuff at your repo, and they'll know (approximately) what to use to build?

Posted 2 years ago #
gbulmer
Moderator

On a different, but related subject, has anyone got NetBeans working with the ARM's Launchpad gcc?

Posted 2 years ago #
ventosus
Member

@gbulmer, I've started collecting some (still incomplete) info about the F3-port in a README.md (which happens to elegantly supercede the README in the top-level directory as GitHub repo main page)

https://github.com/ventosus/libmaple/tree/F3

Posted 2 years ago #
crenn
Moderator

Had a quick read, it's very good so far. Has everything most people would need and basically everything I used is also there.

Posted 2 years ago #
gbulmer
Moderator

ventosus - Wow!

The page at https://github.com/ventosus/libmaple/tree/F3 is very good.

It has more information than I could have hoped.
Great Stuff!

One question.
I had thought someone had got the Maple's USB bootloader working on the F3. However, right now, I don't know why I think that.
Is that true?

Posted 2 years ago #
crenn
Moderator

Not that I'm aware of, because of the built in DFU bootloader on the F3, we no longer needed the Maple USB bootloader (although there are advantages to using it as we don't have reset the board if we accidently put it in that mode). What I've been able to do is use the IDE to cause a reboot into the DFU bootloader using the code ventosus provided.

Posted 2 years ago #

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