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Re: libsanitizer merge from upstream r208536

Hi Peter,

Last time I tried, asan did not work on ppc32 for a large number of
different reasons.
In upstream build system ppc32 is simply disabled, so imho it should
be also disabled in the GCC build.
If there is enough interest in ppc32, please work with up on fixing
upstream and enabling the build bots --
then we can talk about supporting ppc32 in GCC (it will actually come
for free then).
(I can't say whether ppc64 works today, but at least it worked for me
at some point).


On Fri, May 23, 2014 at 10:54 PM, Peter Bergner <> wrote:
> On Fri, 2014-05-23 at 11:47 -0500, Peter Bergner wrote:
>> The following patch gets bootstrap working again, but there seems to
>> be a large number of testsuite failures I will look into before
>> submitting the patch to the LLVM mailing list.
> FYI, it looks like a huge number of the failures are from the following
> in 32-bit mode:
> /home/bergner/gcc/build/gcc-fsf-mainline-asan-debug/powerpc64-linux/32/libsanitizer/asan/.libs/ undefined reference to `__sync_fetch_and_add_8'^M
> collect2: error: ld returned 1 exit status^M
> Kosta, we don't have a __sync_fetch_and_add_8 in 32-bit, since
> we don't have the necessary hardware instructions to do a 64-bit
> fetch and add.  How is this supposed to work?  There are some
> libatomic routines we could call (eg, __atomic_fetch_add_8).
> Is that an option?  ...or maybe we shouldn't even be attempting
> call a 64-bit fetch/add for things larger than a register size?
> Peter

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