[Bug ld/28903] LD producing SegFault executables with FreePascal 2.6.4, in Binutils-2.36.1 and later

[jbthiel at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28903

--- Comment #10 from John B Thiel <jbthiel at gmail dot com> ---
(In reply to H.J. Lu from comment #9)
> (In reply to John B Thiel from comment #8)
> > (In reply to H.J. Lu from comment #6)
> > > What is the last known working binutils?
> > 
> > The last known good is binutils-2.35.2
> 
> binutils-2.35.2 doesn't work for me:
> 
> [hjl@gnu-tgl-3 pr28903]$ ./ld -V
> GNU ld (GNU Binutils) 2.35.2
>   Supported emulations:
>    elf_x86_64
>    elf32_x86_64
>    elf_i386
>    elf_iamcu
>    elf_l1om
>    elf_k1om
> [hjl@gnu-tgl-3 pr28903]$ make
> ./ld -b elf64-x86-64 -m elf_x86_64 -Map myprog.map -L. -T link.t -o x
> ./x
> make: *** [Makefile:5: all] Segmentation fault
> [hjl@gnu-tgl-3 pr28903]$ 
> 
> It crashed during start up.



Well, now we are into your territory, I hope you can figure it out.  What I can
tell you is binutils-2.35.2 and earlier have been working solid reliable for a
long time, years.

I noticed you are using the -T flag.  The FPC specifically doesn't use that,
something to do with the builtin system script that they override with their
own, or the other way round.

For a possible clue, here is what the FPC devs had a guess it relates to,
copied from the FPC bug report I put at
  https://gitlab.com/freepascal.org/fpc/source/-/issues/39324



https://wiki.freepascal.org/User_Changes_3.2.0#GNU_Binutils_2.19.1_or_later_are_required_by_default
GNU Binutils 2.19.1 or later are required by default
    Old behaviour: The compiler invocation of the linker always resulted in a
warning stating "did you forget -T?"
    New behaviour: The compiler now uses a different way to invoke the linker,
which prevents this warning, but this requires functionality that is only
available in GNU Binutils 2.19 and later.
    Reason: Get rid of the linker warning, which was caused by the fact that we
used the linker in an unsupported way (and which hence occasionally caused
issues).
    Remedy: If you have a system with an older version of GNU Binutils, you can
use the new -X9 command line parameter to make the compiler revert to the old
behaviour. You will not be able to (easily) bootstrap the new version of FPC on
such a system though, so use another system with a more up-to-date version of
GNU Binutils for that.
---
https://gitlab.com/freepascal.org/fpc/source/-/commit/4564bffb85e5947cf7bdfa3e2c67bc032775d0c5
 * use binutils 2.19+ linker script "augmentation" functionality to specify
    how the fpc sections have to be linked *on Linux*. This prevents the
    "did you forget -T" warnings from ld, and in general is more correct than
    our previous approach of specifying a complete linker script without -T
    and hoping that there won't be any unexpected interactions with ld's
    built-in linker script (fixed version of r31664, thanks to Alan Modra)
   o use the new -X9 command line option to generate linker scripts that
     are compatible with binutils older than 2.19 (reverts to the old
     behaviour)


Note it is *not* confirmed that this is the actual issue here.  This prior
issue relates to something in binutils 2.19,  whereas I have fully confirmed
this current issue is between binutils-2.35 and 2.36.   Maybe it's the same
problem, or not.

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