Hi, I suspect that is still true regarding IAR, Keil. YMMV regarding how much gain you’ll get.
That being said, I’ve always ended up using gcc. The gains from commercial compilers have not been worth the seat cost for me. This given that the size difference in output (as an example) has been in the ballpark of 5% - 15%. I don’t have any concrete numbers in front me, it’s been a while since I looked at this (so the ballpark might or might not be accurate). > On Jul 6, 2017, at 11:10 PM, Raoul van Bergen <raoul.van.ber...@icloud.com> > wrote: > > 3 years ago we performed some benchmarking comparing gcc against IAR for a > cortex M3 design and at that time the IAR outperformed gcc significantly both > in terms of code speed and size (so optimization). > If this still holds true is unknown to me and it would be interesting if > someone could do the comparison on Mynewt with current versions of compilers. > > > Raoul van Bergen > >> On 6. Jul 2017, at 22:33, Sterling Hughes <sterling.hughes.pub...@gmail.com> >> wrote: >> >> I think clang support is definitely a requirement going forward. IMO It >> would be nice to support IAR and Keil as options, although it would mean >> maintaining multiple linker scripts and a portability layer that abstracted: >> >> - Packed structs >> - Inline assembler >> - Memory sections >> >> Not impossible, but hard to do readably. >> >> What are people’s thoughts? I know Keil and IAR have reasonable usage now, >> but are they important compilers to invest time into now to support, or has >> their time passed? >> >> Sterling >> >>> On 6 Jul 2017, at 11:14, Christopher Collins wrote: >>> >>>> On Thu, Jul 06, 2017 at 06:41:12PM +0100, Jonathan Pallant wrote: >>>> Hi, I just wanted to jump in here and suggest that -std=c11 is a better >>>> choice than -std=gnuXX. If you allow GNU specific extensions then you >>>> might have issues using other compilers - certainly I would be surprised >>>> to see the project to rule out clang support in the future. I would >>>> suggest c11 over c99 as it offers things like atomics which might be >>>> useful. >>> >>> I was under the impression that Mynewt already uses some gnu extensions, >>> though I could be wrong about that. Regarding clang- it also supports >>> the gnuXX "standards". It would be nice to support other compilers as >>> well, but I think that would be quite an uphill battle, and these days, >>> I wonder how many people would want to use a toolchain other than gcc or >>> clang for Mynewt. >>> >>> Chris
