https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61577
--- Comment #39 from The Written Word <bugzilla-gcc at thewrittenword dot com>
---
(In reply to EML from comment #25)
> I have applied the patch and tried your other suggestions, still the stage1
> compiler has the same problems generating executables.
>
> In analyzing the intermediate files between working (gcc 4.93) and not
> (bootstrap 8.3), the intermediate files seem similar until the "mach" stage
>
> The problem seems to be in out the compiler decides to reference a string in
> the source.
>
> My program is:
>
> #include <stdio.h>
>
> int main()
> {
> printf("Hellos World\n");
> return 0;
> }
>
> The generated .s file for Working does this:
>
> .LC0:
> stringz "Hellos World"
>
> <edited for breivity>
>
> addl r36 = @ltoffx(.LC0), r1
> ;;
> ld8.mov r36 = [r36], .LC0
>
> The non-working .s file does this:
>
> .LC0:
> stringz "Hellos World"
>
> <edited for breivity>
>
> movl r36 = @gprel(.LC0)
> ;;
> add r36 = r1, r36
>
>
> If I replace those 3 lines and run the assembler+linker by hand - the
> non-working foo.s will run correctly
I can now duplicate what you're seeing:
$ diff -u gcc-4.9.4/hello.s gcc-8.3.0/hello.s
--- gcc-4.9.3/hello.s 2019-07-05 04:55:49 +0000
+++ gcc-8.3.0/hello.s 2019-07-05 04:55:44 +0000
@@ -1,5 +1,6 @@
.file "hello.c"
.pred.safe_across_calls p1-p5,p16-p63
+ .section .text, "ax", "progbits"
.section .rodata, "a", "progbits"
.align 8
.LC0:
@@ -19,9 +20,9 @@
mov r32 = b0
mov r35 = r1
.body
- addl r36 = @ltoffx(.LC0), r1
+ movl r36 = @gprel(.LC0)
;;
- ld8.mov r36 = [r36], .LC0
+ add r36 = r1, r36
br.call.sptk.many b0 = puts#
mov r1 = r35
mov r14 = r0
$ grep LTOFF <objdir>/gcc/config.status
D["HAVE_AS_LTOFFX_LDXMOV_RELOCS"]=" 1"
