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Use libgcc.a compiled with -Os instead of the default -O2 on boards that are tight on space #4705

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dhalbert opened this issue May 3, 2021 · 3 comments
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Use libgcc.a compiled with -Os instead of the default -O2 on boards that are tight on space #4705

dhalbert opened this issue May 3, 2021 · 3 comments
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dhalbert commented May 3, 2021

The official ARM gcc toolchain compiles libgcc.a as -O2. The arch Linux ARM toolchain uses -Os. We discovered that building on arch saved a kB or two (at least).

We can consider replacing the stock libgcc.a in the ARM toolchain with a -Os version to make room on the smallest boards for new features.
@dhalbert dhalbert added this to the Long term milestone May 3, 2021
@dhalbert dhalbert self-assigned this Sep 13, 2021
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tannewt commented Mar 8, 2022

@dhalbert You look into this a bit right? What did you run into?

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dhalbert commented Mar 8, 2022

I tried to build libgcc.a as part of building the ARM gcc toolchain from their supplied sources, so I could then change libgccs build flags and make sure I got a library that would be cleanly substitutable. Despite following the directions carefully, I was unable to get the toolchain to build far enough to build that library. I think I tried this twice. Perhaps it will be easier with the 11.2 sources

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tannewt commented Mar 8, 2022

I know that they changed the way they build their archive. I think they use Linode CI now. (I saw the info on the embedded.fm slack.)

@tannewt tannewt assigned tannewt and unassigned dhalbert Aug 4, 2022
@tannewt tannewt mentioned this issue Aug 4, 2022
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@tannewt tannewt closed this as completed in e7d72b1 Aug 5, 2022
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