svn commit: r418247 - in head/devel/gps: . files

[John Marino]

On 7/11/2016 07:23, Alexey Dokuchaev wrote:
> On Fri, Jul 08, 2016 at 10:28:04PM +0000, John Marino wrote:
>> New Revision: 418247
>> URL: https://svnweb.freebsd.org/changeset/ports/418247
>>
>> Log:
>>   devel/gps: Fix compiler error highlight on FreeBSD
>>
>>   On DragonFly, GPS has been properly highlighting code errors during
>>   compilation, but on FreeBSD nothing happens.  Luckily Rod Kay has been
>>   persistent in diagnosing the cause and he finally isolated it to a
>>   too-short timeout interval for Expect calls.  The timeout period was
>>   set to 1 millisecond, the absolute shortest interval possible.  While
>>   Linux and DF could complete the function call during this time, FreeBSD
>>   requires at least 10 milliseconds to do the same.
>
> Fascinating.  Did you guys try to understand what makes Linux and DF over a
> magnitude faster than FreeBSD?  Is there something that needs to be fixed?
>

I didn't spend much time on it because it's nothing that can be fixed 
with regard to GPS.  I believe the timeout of "1" is itself a logic 
mistake that FreeBSD exposed.

With a cursory glance, I'd guess the problem is centered around polling 
file descriptors -- I'd particularly suspect the __gnat_expect_poll 
function in gcc/ada/expect.c to hold the answer.

short answer: yes, the implementation of the culprit should be improved 
at the OS-level but you are talking about FreeBSD 12.  I wrote this 
descriptive commit in the hopes it would catch someone's eye.

John

---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus