------- Comment #26 from dannysmith at users dot sourceforge dot net
2008-10-01 01:33 -------
(In reply to comment #14)
> Hi Guys,
>
> I am not able to reproduce the build problems that were reported with the
> first version of my patch, but then again I do not have a native cygwin build
> system or a system in which I can bootstrap mingw32. I think that Brian may
> well be right however in that the patch is behaving badly when it manually
> switches into the .bss section. I have uploaded a revised version of the
> patch
> which uses the correct gcc function to perform the section switch, so please
> can anyone who is interested give this new patch a run.
This latter patch, applied to R139853 [*] (just before the big IRA merge) does
not cause the build problems of the prior patch but does not solve the problem
either.
With this patch, using your _align.c test case which I uploaded in previous
comment:
gcc -DHAVE_ALIGNED_COMMON _align.c && a.exe
fails.
The assembler code, specifically the .balign 32 directive applied to the
_common object looks like it should do the right thing, but doesn't (:
.file "_align.c"
.bss
.balign 1
.comm _a, 1
.balign 32
.comm _common, 64
.globl _b
.section .bss,"w"
_b:
.space 1
.globl _bss
.align 32
_bss:
.space 64
.globl _c
.data
_c:
.byte 1
.globl _data
.align 32
_data:
.long 1
.space 4
.long 2
.space 4
.long 3
.space 12
.long 4
.space 28
.text
.globl _test
.def _test; .scl 2; .type 32; .endef
_test:
pushl %ebp
movl %esp, %ebp
subl $8, %esp
movl 8(%ebp), %eax
addl $8, %eax
andl $7, %eax
testl %eax, %eax
jne L2
movl 8(%ebp), %eax
addl $16, %eax
andl $15, %eax
testl %eax, %eax
jne L2
movl 8(%ebp), %eax
addl $32, %eax
andl $31, %eax
testl %eax, %eax
je L4
L2:
call _abort
L4:
leave
ret
.def ___main; .scl 2; .type 32; .endef
.globl _main
.def _main; .scl 2; .type 32; .endef
_main:
pushl %ebp
movl %esp, %ebp
andl $-16, %esp
subl $16, %esp
call ___main
movl $_common, (%esp)
call _test
movl $_bss, (%esp)
call _test
movl $_data, (%esp)
call _test
movl $0, (%esp)
call _exit
.def _abort; .scl 2; .type 32; .endef
.def _exit; .scl 2; .type 32; .endef
[*] Since the IRA merge, mingw32 has been broken, failing to compile libstdc++
and raising many (>500 in gcc.dg) new testcase errors.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37216
