MSP430 math.h build error

[rpcaldeira]

Hello guys!

I'm having a problem where i'm trying to use the math library in my code but it doesen't work.

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#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include <stdint.h>
#include <stdlib.h>
#include <math.h>

it is included and present in the makefile:

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##############################################################################
# Start of default section
#

# List all default C defines here, like -D_DEBUG=1
DDEFS = -D__MSP430F1611__

# List all default ASM defines here, like -D_DEBUG=1
DADEFS =

# List all default directories to look for include files here
DINCDIR =

# List the default directory to look for the libraries here
DLIBDIR = /usr/msp430/lib

# List all default libraries here
DLIBS = -lm

can anyone help me? Thanks guys

[Giovanni]

You should detail the "does not work" part.

Giovanni

[rpcaldeira]

I'm deeply sorry, must have been the rush :/

When comes to the linking part, it gives me the undefined reference error

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msp430-gcc ../../os/ports/GCC/MSP430/chcoreasm.o ../../os/kernel/src/chsys.o ../../os/kernel/src/chdebug.o ../../os/kernel/src/chlists.o ../../os/kernel/src/chvt.o ../../os/kernel/src/chschd.o ../../os/kernel/src/chthreads.o ../../os/kernel/src/chdynamic.o ../../os/kernel/src/chregistry.o ../../os/kernel/src/chsem.o ../../os/kernel/src/chmtx.o ../../os/kernel/src/chcond.o ../../os/kernel/src/chevents.o ../../os/kernel/src/chmsg.o ../../os/kernel/src/chmboxes.o ../../os/kernel/src/chqueues.o ../../os/kernel/src/chmemcore.o ../../os/kernel/src/chheap.o ../../os/kernel/src/chmempools.o ../../test/test.o ../../test/testthd.o ../../test/testsem.o ../../test/testmtx.o ../../test/testmsg.o ../../test/testmbox.o ../../test/testevt.o ../../test/testheap.o ../../test/testpools.o ../../test/testdyn.o ../../test/testqueues.o ../../test/testbmk.o ../../os/hal/src/hal.o ../../os/hal/src/adc.o ../../os/hal/src/can.o ../../os/hal/src/ext.o ../../os/hal/src/gpt.o ../../os/hal/src/i2c.o ../../os/hal/src/icu.o ../../os/hal/src/mac.o ../../os/hal/src/mmc_spi.o ../../os/hal/src/mmcsd.o ../../os/hal/src/pal.o ../../os/hal/src/pwm.o ../../os/hal/src/rtc.o ../../os/hal/src/sdc.o ../../os/hal/src/serial.o ../../os/hal/src/serial_usb.o ../../os/hal/src/spi.o ../../os/hal/src/tm.o ../../os/hal/src/uart.o ../../os/hal/src/usb.o ../../os/hal/platforms/MSP430/hal_lld.o ../../os/hal/platforms/MSP430/pal_lld.o ../../os/hal/platforms/MSP430/serial_lld.o ../../boards/TRENZ_0600_02/board.o ../../os/various/memstreams.o ../../os/various/chprintf.o ../../os/various/shell.o ../../os/various/evtimer.o RF/driver/RF.o RF/basicrf/basic_rf.o main.o  -mmcu=msp430x1611 -Tmsp430.x -Wl,-Map=Thesis.map,--cref,--no-warn-mismatch -L/usr/msp430/lib -lm  -o Thesis.elf
RF/basicrf/basic_rf.o: In function `randn':
basic_rf.c:(.text+0x5cc): undefined reference to `exp'
RF/basicrf/basic_rf.o: In function `expon':
basic_rf.c:(.text+0x6e4): undefined reference to `log'
collect2: ld returned 1 exit status

thanks again

[Giovanni]

Hi,

It looks related to the compiler, did you build it yourself? check if in the library there are those symbols because apparently not.

Giovanni

[rpcaldeira]

Hey, no it was not built by me. Those are the packages msp430-libc, msp430mcu, mspdebug from XUbuntu 14.04.

That was my frist thought too but when i looked at the math.h file...

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#ifndef _REENT_ONLY
#ifndef __math_6881
extern double acos _PARAMS((double));
extern double asin _PARAMS((double));
extern double atan2 _PARAMS((double, double));
extern double cosh _PARAMS((double));
extern double sinh _PARAMS((double));
extern double exp _PARAMS((double));
extern double ldexp _PARAMS((double, int));
extern double log _PARAMS((double));
extern double log10 _PARAMS((double));
extern double logb _PARAMS((double));
extern double pow _PARAMS((double, double));
extern double sqrt _PARAMS((double));
extern double fmod _PARAMS((double, double));
#endif /* ! defined (__math_68881) */
#endif /* ! defined (_REENT_ONLY) */

The functions are defined, so they should be implemented :S

Thanks again,
Rui

[Giovanni]

The functions are defined in the header, you should verify if the library really contains them.

Giovanni

[rpcaldeira]

You were right i used

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nm ./libm.a | grep -w T | grep -E 'log|exp'

and they were not there.

Thanks a million,
Rui