On 2015/07/07 6:32, Mike Hommey wrote:
On Mon, Jul 06, 2015 at 06:44:45PM +0900, ishikawa wrote:
Hi,
Is building mozilla code such as firefox and thunderbird under 32-bit linux
a supported operation?
During compilation of C-C TB under 32-bit linux,
I think I found a serious issue regarding the mismatch of the size
of literal constant and the size of variables (or structured member)
which renders some run-time check ineffective and thus run-time
error conditions are not handled correctly.
Usually, I have to ignore the signed/unsigned comparison, etc. during build
since there are just too many, but this time
the particular warning about the size mismatch against a member
field/variable (|st_size|) of a structure passed to |fstat| caught my eye,
and I noticed the possible seriousness of the issue if my understanding is
correct.
The system is Debian GNU/linux 32-bit:
uname -a
Linux debian-vbox-ci 3.2.0-4-686-pae #1 SMP Debian 3.2.68-1+deb7u1 i686
GNU/Linux
I understand that for official distribution,
mozilla compilation farm seems to use cross compiling from the 64-bit
linux to produce 32-bit linux version of firefox and thunderbird.
If so, then maybe for the official version, the build may happen to pick up
the right size accidentally. Frankly I don't know what is going on,
I suspect there is something incorrect in the headers regarding the behavior
that ought to change according the target/host environment.
Eveb if the official version happens to be correct (by mistake?), still I
want the headers to be correctly written to avoid future issues.
Also, the problem occurs in mozilla/ipc/chromium/src/third_party/libevent
directory.
Yes, I noticed "/third_party/" moniker, but the compilation warning
and the resulting failure of correct runtime check
looks serious enough to discuss the remedy in mozilla community in the
first place. If a consensus patch emerges, we can send the patch
upstream.
It's a mozilla only problem in event-config.h for linux and mac. Please file a
bug.
Mike
Thank you for the comment.
Will do.
CI
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