[avr-libc-dev] [bugs #3485] Using float arithmetic without linking with -lm result in incorrect code

[Joerg Wunsch]

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/**************************************************************************/
[bugs #3485] Latest Modifications:

Changes by: 
                Joerg Wunsch <address@hidden>
'Date: 
                Wed 12/22/04 at 22:11 (Europe/Berlin)

            What     | Removed                   | Added
---------------------------------------------------------------------------
              Status | Open                      | Closed


------------------ Additional Follow-up Comments ----------------------------
We ought to merge libc and libm completely.  There are
other discrepancies as well, like FP conversion functions
listed in <stdlib.h>, while their implementation is only
present in libm.a.

This item will be deferred until after the release of 1.2.0.






/**************************************************************************/
[bugs #3485] Full Item Snapshot:

URL: <http://savannah.nongnu.org/bugs/?func=detailitem&item_id=3485>
Project: AVR C Runtime Library
Submitted by: Andrea Baldoni
On: Tue 05/06/03 at 14:12

Category:  Documentation
Severity:  3 - Ordinary
Priority:  2
Item Group:  None
Resolution:  None
Privacy:  Public
Percent Complete:  0%
Assigned to:  None
Originator Email:  address@hidden
Status:  Closed


Summary:  Using float arithmetic without linking with -lm result in incorrect 
code

Original Submission:  In the normal C environment, it's possibile to compile 
correct code using floating point arithmetic without linking math library. Math 
library is required only if functions like sin() are used. I try to do the same 
with avr-libc, but the math code included (__floatsisf for instance) contains 
jmp 0x0 wich obviusly isn't what I wanted. Linking with -lm is a solution, but 
it must be stated that every use of FPA requires -lm.

Follow-up Comments
------------------


-------------------------------------------------------
Date: Wed 12/22/04 at 22:11         By: Joerg Wunsch <joerg_wunsch>
We ought to merge libc and libm completely.  There are
other discrepancies as well, like FP conversion functions
listed in <stdlib.h>, while their implementation is only
present in libm.a.

This item will be deferred until after the release of 1.2.0.

-------------------------------------------------------
Date: Wed 05/07/03 at 15:46         By: Eric Weddington <arcanum>
Reduced severity as it's a documentation change.






File Attachments
-------------------

-------------------------------------------------------
Date: Tue 05/06/03 at 14:12  Name: k  Size: 315B   By: abaldoni
Disassembly of __floatsisf without -lm
http://savannah.nongnu.org/bugs/download.php?item_id=3485&amp;item_file_id=430






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