[Tinyos-help] math.h on Telosb

[Eric Decker]

I suspect that is because the routines are actually implemented in a
library.You'll have to poke around and see what libraries are available.

The normal libgcc.a library provided for the msp430 toolchain doesn't have
these routines in them.

eric


On Tue, Jan 27, 2009 at 3:24 PM, BAI LI <libai0915 at gmail.com> wrote:

> HI,
>
> I was trying to use math.h file sitting in the MSP folder to run some sqrt
> and pow functions. But once I include the file math.h it told me undefined
> reference to sqrt and pow. The errors shown in the following:
>
> $ make telosb
> mkdir -p build/telosb
>     compiling TestAesAppC to a telosb binary
> ncc -o build/telosb/main.exe  -Os -O -mdisable-hwmul -Wall -Wshadow
> -Wnesc-all -
> target=telosb -fnesc-cfile=build/telosb/app.c -board=
> -DDEFINED_TOS_AM_GROUP=0x2
> 2 -DIDENT_APPNAME=\"TestAesAppC\" -DIDENT_USERNAME=\"EIT\"
> -DIDENT_HOSTNAME=\"ws
> n\" -DIDENT_USERHASH=0xa200ffadL -DIDENT_TIMESTAMP=0x497fa030L
> -DIDENT_UIDHASH=0
> xb441b921L -I/opt/tinyos-2.x/tos/lib/printf  TestAesAppC.nc -lm
> /opt/tinyos-2.x/tos/chips/cc2420/lpl/DummyLplC.nc:39:2: warning: #warning
> "*** L
> OW POWER COMMUNICATIONS DISABLED ***"
> /cygdrive/c/DOCUME~1/EIT/LOCALS~1/Temp/cc7jt2Gp.o: In function
> `VirtualizeTimerC
> $0$fireTimers':
> app.c:(.text+0x1494): undefined reference to `pow'
> make: *** [exe0] Error 1
>
> So can anyone help me out? I searched the list. Sum1 said to use lm to link
> the math library. How to do it properly? Like make telosb lm? It didnt'
> work. Thanks in advance.
>
> Regards,
> Bai
>
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>



-- 
Eric B. Decker
Senior (over 50 :-) Researcher
Autonomous Systems Lab
Jack Baskin School of Engineering
UCSC
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