Subject:
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Re: undefined reference to `___ucmpsi2'
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Thu, 18 Jan 2001 20:02:09 GMT
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Viewed:
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1304 times
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Hi,
The problem is that wakeup_t is an unsigned long, and in order to save space,
the switch statement is optimized to call a library comparator, ucmpsi2. Since
the argument to ds_scale is an unsigned int, the argument to LIGHT should also
be an unsigned int. If you specify the argument prototype to light_found as an
unsigned int, all works fine. You should also specify the return type of
light_found as an unsigned int too. Another option is to add the comparator
function into lib/mint.
Pat
In lugnet.robotics.rcx.legos, Ross Crawford writes:
> I get this error when linking if I have the following in my source code in a
> wait_event function:
>
> #define THRESHOLD (unsigned short)50
>
> static wakeup_t light_found(wakeup_t sens_num) {
> switch (sens_num) {
> case 2:
> return (LIGHT(SENSOR_2) > THRESHOLD);
> break;
> case 3:
> return (LIGHT(SENSOR_3) > THRESHOLD);
> break;
> }
> return 0;
> }
>
> The following works fine:
>
> static wakeup_t light_found(wakeup_t sens_num) {
> if (sens_num == 2)
> return (LIGHT(SENSOR_2) > THRESHOLD);
> if (sens_num == 3)
> return (LIGHT(SENSOR_3) > THRESHOLD);
> return 0;
> }
>
> Anyone know why?
>
> Thanks
>
> ROSCO
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Message has 2 Replies:
 | | Re: undefined reference to `___ucmpsi2'
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| (...) Another choice may be a cast in the switch statement, like this: static wakeup_t light_found(wakeup_t sens_num) { switch ((unsigned int)sens_num) { case 2: return (LIGHT(SENSOR_2) > THRESHOLD); break; case 3: return (LIGHT(SENSOR_3) > (...) (24 years ago, 18-Jan-01, to lugnet.robotics.rcx.legos)
| | | Re: undefined reference to `___ucmpsi2'
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| (...) With regards to this, it appears that Markus left out two necessary functions in lib/mint. Specifically, cmpsi2 and ucmpsi2. These are a part of librcx but apparently they were omitted from LegOS when Markus included support for the other (...) (24 years ago, 19-Jan-01, to lugnet.robotics.rcx.legos)
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Message is in Reply To:
| | undefined reference to `___ucmpsi2'
|
| I get this error when linking if I have the following in my source code in a wait_event function: #define THRESHOLD (unsigned short)50 static wakeup_t light_found(wakeup_t sens_num) { switch (sens_num) { case 2: return (LIGHT(SENSOR_2) > THRESHOLD); (...) (24 years ago, 18-Jan-01, to lugnet.robotics.rcx.legos)
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