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Subject: Re: DJGPP build of gcc-10.3.0 and make 4.3 incompatibility
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On 2021-11-03 15:43, Andris Pavenis (andris DOT pavenis AT iki DOT fi) [via djgpp AT delorie DOT com] wrote:
> Actually gcc-10.3.0 was built for DJGPP, just not uploaded (both RPMs and DJGPP packages). Uploading could be easy.

I've been waiting for djcross-gcc-10.3.0.tar.bz2, please do upload :)

> gcc-11 is a different story:
> 
> - Ada library does not compile - alignment issues which are likely to cause problems also for other languages like (c or C++) when SSE or AVX is being used (and maybe even with earlier GCC versions)

What sort of alignment issues?  I already ran into alignment trouble with SSE
(at run-time, not compile-time).  To work around it, in the linker script I put
SUBALIGN(0x10) on the .text and .bss sections.  For .data this is not possible
because it leaves gaps in the ctors/dtors list, so I ended up linking
*(.data .data.* .gnu.linkonce.d*) in .text.  A bit of a hack but .text is
writable.  I suppose the input section alignment could be changed in binutils
somewhere though.

Also in libc I had to put attribute __attribute__((force_align_arg_pointer)) on
__crt1_startup() to align the stack for ctors & main().  Alternatively this
alignment could be performed manually in crt0.S.