[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

[slyfox at inbox dot ru]

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

--- Comment #6 from Sergei Trofimovich <slyfox at inbox dot ru> ---
An observation (does not pretend to be a fix) to make gcc compile standard
library and be able to build runnable hello world on gcc master:

1. MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS can be unoptimised
2. assemble_integer has to be tweaked to avoid failure in dwarf generation

--- a/gcc/config/mmix/mmix.c
+++ b/gcc/config/mmix/mmix.c
@@ -72,7 +72,7 @@ along with GCC; see the file COPYING3.  If not see
 #define MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS                        \
  (flag_exceptions                                              \
   && ((reload_completed && df_regs_ever_live_p (MMIX_rJ_REGNUM))       \
-      || !leaf_function_p ()))
+      || true))

 #define IS_MMIX_EH_RETURN_DATA_REG(REGNO)      \
  (crtl->calls_eh_return                \
diff --git a/gcc/varasm.c b/gcc/varasm.c
index 85296b4a2ec..e8d26bd1623 100644
--- a/gcc/varasm.c
+++ b/gcc/varasm.c
@@ -2816,7 +2816,7 @@ assemble_integer (rtx x, unsigned int size, unsigned int
align, int force)
       gcc_assert (!i);
     }

-  gcc_assert (!force);
+  //gcc_assert (!force);

   return false;
 }