On Fri, 18 May 2007, Andrew Morton wrote:
>
> gcc-4.3 appears to have cunningly converted this:
Very cunning indeed.
Considerign that gcc converted straightforward and simple code to a total
disaster with a 64-bit divide, I'd call it a gcc bug.
> into a divide-by-1000000000 operation, so it emits a call to udivdi3 and we
> don't link.
I think the proper fix is to just tell people that version of gcc is
broken.
Linus
If anybody wonders where this quote came from; just google "udivdi3 gcc".
Current gcc-20070623 message:
ld -m elf_i386 -m elf_i386 -o .tmp_vmlinux1 -T arch/i386/kernel/vmlinux.lds
arch/i386/kernel/head.o arch/i386/kernel/init_task.o init/built-in.o
--start-group usr/built-in.o arch/i386/kernel/built-in.o
arch/i386/mm/built-in.o arch/i386/mach-default/built-in.o
arch/i386/crypto/built-in.o kernel/built-in.o mm/built-in.o fs/built-in.o
ipc/built-in.o security/built-in.o crypto/built-in.o block/built-in.o
lib/lib.a arch/i386/lib/lib.a lib/built-in.o arch/i386/lib/built-in.o
drivers/built-in.o sound/built-in.o arch/i386/pci/built-in.o
arch/i386/power/built-in.o net/built-in.o --end-group
kernel/built-in.o: In function `getnstimeofday':
(.text+0x1eba5): undefined reference to `__udivdi3'
kernel/built-in.o: In function `do_gettimeofday':
(.text+0x1ecca): undefined reference to `__udivdi3'
kernel/built-in.o: In function `update_wall_time':
(.text+0x1f0f4): undefined reference to `__udivdi3'
make: *** [.tmp_vmlinux1] Error 1
For more details see PR31541 PR32044 PR31990
--
Summary: gcc-4.3.x _32-bit_ becoming irrelevant to kernel
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: malitzke at metronets dot com
GCC build triplet: i686-pc-linux-gnu
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32494
