[Bug target/86651] [8/9 Regression] lto-wrapper.exe: fatal error: simple_object_copy_lto_debug_sections not implemented: Invalid argument

[rguenther at suse dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86651

--- Comment #7 from rguenther at suse dot de <rguenther at suse dot de> ---
On Wed, 25 Jul 2018, jwjagersma at gmail dot com wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86651
> 
> --- Comment #6 from jwjagersma at gmail dot com ---
> (In reply to Richard Biener from comment #5)
> 
> After building a more complex program with the above patch (applied to gcc
> 8.1.0 release sources), this ICE appears during linking:
> 
> lto1.exe: internal compiler error: in gen_subprogram_die, at dwarf2out.c:22668
> libbacktrace could not find executable to open
> Please submit a full bug report,
> with preprocessed source if appropriate.
> See <https://gcc.gnu.org/bugs/> for instructions.
> lto-wrapper.exe: fatal error:
> D:\msys64\usr\local\cross\bin\i586-pc-msdosdjgpp-g++.exe returned 1 exit status
> compilation terminated.
> collect2.exe: fatal error: lto-wrapper returned 1 exit status
> compilation terminated.
> 
> Being entirely unfamiliar with gcc internals, I'm not sure what went wrong
> here.

There are latent bugs that now affect darwin, mingw and djgpp (after your
patch) by default when compiling with -g0 and linking with -g
(which is basically what those patches enforce).

Some of them have been fixed on the GCC 8 branch already so I suggest
you use the GCC 8.2 release candidate tarball to see if it works there.
(ftp://gcc.gnu.org/pub/gcc/snapshots/8.2.0-RC-20180719/)