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Re: GCC4.3.3: Bootstrap comparison failure!
- From: Ian Lance Taylor <iant at google dot com>
- To: chenyang <chenyang dot cq at gmail dot com>
- Cc: gcc <gcc at gcc dot gnu dot org>
- Date: Wed, 20 May 2009 07:13:21 -0700
- Subject: Re: GCC4.3.3: Bootstrap comparison failure!
- References: <f0483cde0905200046n3c08c17crce158ef5690fb8c9@mail.gmail.com>
chenyang <chenyang.cq@gmail.com> writes:
> I got a "Bootstrap comparison failure!" error when building gcc 4.3.3:
These kinds of issues are always difficult to debug. There have been a
couple of patches to stabilize different sorts which I don't think are
in 4.3.3. That could conceivably cause differences if address space
randomization is turned on. I don't know of any specific bug reports,
though. In any case, try turning off address space randomization
(/proc/sys/kernel/randomize_va_space).
> finally, I compared langhooks1.o langhooks2.o
>>cmp -i 16 langhooks1.o langhooks2.o
> langhooks1.o langhooks2.o differ: byte 76626, line 514
Try running your commands with the --save-temps options and compare the
resulting .s files. Also, try running the commands with the
-fdump-tree-all -fdump-rtl-all options and see where the dump files
first differ.
Ian