Re: [PATCH] [alpha] adjust MEM alignment for block move [PR115459] (was: Re: [PATCH v2] [PR100106] Reject unaligned subregs when strict alignment is required)

[Joseph Myers <josmyers@redhat.com>]

On Thu, 13 Jun 2024, Maciej W. Rozycki wrote:

> > This was tricky to duplicate without access to an alpha-linux-gnu
> > machine.  I ended up building an uberbaum tree with --disable-shared
> > --disable-threads --enable-languages=ada up to all-target-libgcc, then I
> > replaced gcc/collect2 with a wrapper script that dropped crt[1in].o and
> > -lc, so that link tests in libada/configure would succeed without glibc
> > for the target.  libada still wouldn't build, because of the missing
> > glibc headers, but I could compile g-depboo.adb with -I pointing at a
> > x86_64-linux-gnu's gcc/ada/rts build tree, and with that, at -O2, I
> > could trigger the problem and investigate it.  And with the following
> > patch, the problem seems to be gone.
> 
>  If you like, I'll share with you a pair of scripts I use to cross-compile 
> Linux configurations.  No target system is required to build things and 
> all is done based on git checkouts from the relevant upstream repos, which 
> then bootstrap themselves using whatever compiler is locally available to 
> bootstrap native GCC first and then going through the ususal steps to get 
> a target cross-compiler.

Also, you can use build-many-glibcs.py --full-gcc to build a cross 
compiler with all languages (for any architecture and ABI supported by 
glibc), but you need to build the same-version native compiler yourself 
first (and put it in the PATH) in order to build Ada; that bit isn't 
automated by build-many-glibcs.py.

-- 
Joseph S. Myers
josmyers@redhat.com