[Bug target/85666] gcc-8.0.1 fails to build mmix target: gcc/libgcc/libgcc2.h:203:20: internal compiler error: in leaf_function_p, at final.c:4488

[wilco at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85666

Wilco <wilco at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |wilco at gcc dot gnu.org

--- Comment #3 from Wilco <wilco at gcc dot gnu.org> ---
(In reply to Sergei Trofimovich from comment #1)

>  #define MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS			\
>   (flag_exceptions						\
>    && ((reload_completed && df_regs_ever_live_p (MMIX_rJ_REGNUM))	\
>  || !leaf_function_p ())) /// <- here


Yes that looks like a bug. leaf_function_p cannot be called on a sequence as it
will incorrectly return true on non-leaf functions. So
MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS will randomly change its result if
called again later. starting_frame_offset should however return a fixed value,
so the reload_completed part also looks wrong.