GNU bug report logs - #12753
printf in make-prime-list.c uses "modern" features

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Message #19 received at 12753-done <at> debbugs.gnu.org (full text, mbox):

From: John David Anglin <dave.anglin <at> bell.net>
To: Pádraig Brady <P <at> draigBrady.com>
Cc: John David Anglin <dave <at> hiauly1.hia.nrc.ca>, 12753-done <at> debbugs.gnu.org
Subject: Re: bug#12753: printf in make-prime-list.c uses "modern" features
Date: Sat, 3 Nov 2012 21:19:43 -0400

On 3-Nov-12, at 8:55 PM, Pádraig Brady wrote:

> On 10/29/2012 12:22 PM, John David Anglin wrote:
>> On 28-Oct-12, at 9:57 PM, Pádraig Brady wrote:
>>
>>> Is %jx not supported, or is the * not supported with %j?
>>> I'm guessing the latter since you got a runtime issue
>>> rather than a compile time one.  We also use '*' in
>>> other format strings, so I doubt that's an issue in itself.
>>
>>
>> I will test this evening.  The printf manpage doesn't mention %j
>> or * in the HP-UX 10.20 and 11.11 pages.  Sometimes things
>> are supported but not documented.
>
> I've now pushed the patch set from this thread,
> so I'm marking this as done.


As far as I can tell, your patch to make-prime-list.c works.  I'm
currently doing a build with a hack to try fix the threads issue.

The 'j' printf modifier is not supported on HP-UX at least through
to 11.11.  GCC doesn't parse printf format strings to detect unsupported
features.  The string "%ju" outputs "ju".  As a result, the argument
processing messes up.  This is what causes the runtime crash.

So, the other instances where %j is used need examination.

Don't know about '*'.

Thanks,
Dave
--
John David Anglin	dave.anglin <at> bell.net

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