[PATCH 27/31] Makefile: Disable LTO when building with MSYS2

[Tom Rini]

On Fri, Apr 28, 2023 at 09:37:57AM +0200, Marek Behún wrote:
> On Thu, 27 Apr 2023 13:34:53 -0400
> Tom Rini <trini at konsulko.com> wrote:
> 
> > On Thu, Apr 27, 2023 at 10:25:13AM -0600, Simon Glass wrote:
> > > Hi Pali,
> > > 
> > > On Wed, 26 Apr 2023 at 01:07, Pali Rohár <pali at kernel.org> wrote:  
> > > >
> > > > On Tuesday 25 April 2023 19:04:10 Simon Glass wrote:  
> > > > > Hi Pali,
> > > > >
> > > > > On Tue, 25 Apr 2023 at 10:28, Pali Rohár <pali at kernel.org> wrote:  
> > > > > >
> > > > > > On Monday 24 April 2023 17:08:32 Simon Glass wrote:  
> > > > > > > This creates a lot of errors of the form:
> > > > > > >
> > > > > > > `__stack_chk_fail' referenced in section `.text' of ...ltrans.o: defined
> > > > > > >    in discarded section `.text' of common/stackprot.o (symbol from plugin)  
> > > > > >
> > > > > > This issue should be rather fixed...
> > > > > >  
> > > > > > > Drop LTO for now.  
> > > > > >
> > > > > > ... and until it happens is not CONFIG_LTO for disabling enough?
> > > > > >
> > > > > > LTO does not work for more other boards / platforms and it is just _not_
> > > > > > enabled via CONFIG_LTO in those cases...  
> > > > >
> > > > > The thing is, LTO is enabled for sandbox normally (clang and gcc). It
> > > > > is just the MSYS2 platform where there are problems.  
> > > >
> > > > So what about having CONFIG_LTO by default 'n' for CONFIG_MSYS2?  
> > > 
> > > But that would require creating a new board. I am trying to use the
> > > same board, just building it in a different environment.  
> > 
> > I think we need to make CONFIG_LTO depend on CC_IS_GCC for now as it
> > also doesn't work (but could be addressed) for CC_IS_CLANG.
> 
> It got broken? It should work at least for sandbox...

Ah right, we do clang + sandbox (so + LTO). In my clang for arm
experiments, I could only get LTO to almost-link if I also used lld
instead of GNU ld (on the platform I was checking there's some _other_
problem that causes clang's SPL build to be something like 40kB larger
than gcc, so even with LTO it was still overflowing).

-- 
Tom
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