Re: [Xenomai-help] can't link math.h in a userspace programm

[Robert <robert-km@domain.hid>]

Hi,
have You tried to add '-lm' to LDFLAGS?
It adds math library while linking program.


Dnia 23 listopada 2011 10:38 Erik Sommer <erik.sommer@domain.hidr.de> napisał(a):

> Hello,
> 
> I'm programming a userspace Xenomai-Programm für a Xilinx PowerPC
> (additional Information without FPU). I include the math.h because I
> have to use arcustangens and arcuscosinus. When compiling the programm
> it seems so like the linker can't do his job for math.h.
> 
> minimal example:
> 
> "
> #include <stdbool.h>// boolescher Datentyp
> #include <native/task.h>
> #include <native/timer.h>
> #include <rtdm/rtdm.h>
> #include <sys/mman.h>
> #include <stdio.h>
> #include <fcntl.h>
> #include <unistd.h>
> #include <math.h>
> 
> void user_task(void *cookie){
> ...
> Vektor.y_w=0.5*atan(Vektor.y/reg->l_O);
> ...
> }
> "
> 
> the Makefile:
> 
> "
> # Name der zu erstellenden Programmdatei
> PROG=pu10_Las_Vek
> 
> # Liste der C-Dateien im Verzeichnis
> C_DAT=$(wildcard *.c)
> 
> 
> # Variablen für die Benutzung des ELDK-Compilers
> ARCH=powerpc
> 
> #Xenomai Installations Pfad
> DESTDIR=../usersupport/root
> #DESTDIR=/mnt/albatros_projekte/PU10/pu10_sw/PU10_Xenomai/xenomai_build/root
> XENO := $(DESTDIR)/usr/xenomai
> 
> XENOCONFIG=$(shell PATH=$(XENO):$(XENO)/bin:$(PATH) which xeno-config
> 2>/dev/null)
> 
> CC=$(shell $(XENOCONFIG) --cc)
> 
> CFLAGS=$(shell export DESTDIR="$(DESTDIR)"; $(XENOCONFIG) --skin native
> --cflags) $(MY_CFLAGS)
> 
> LDFLAGS=$(shell export DESTDIR="$(DESTDIR)"; $(XENOCONFIG) --skin native
> --ldflags) $(MY_LDFLAGS) -lnative -lrtdm
> 
> #Xenomai Library Pfad in binary hinzufügen
> LPATH=/usr/xenomai/lib
> #LDFLAGS+=-Xlinker -rpath -Xlinker $(shell $(XENOCONFIG) --libdir)
> LDFLAGS+=-Xlinker -rpath -Xlinker $(LPATH) 
> 
> $(PROG):: 
> 	$(CC) -Wall $(CFLAGS) $(LDFLAGS) -L/usr/lib -I/usr/include
> $(C_DAT) ../defines.h ../regbank.h -o $(PROG)	
> 
> clean::
> 	$(RM) $(PROG) *.o
> "
> 
> I hope for some hints.
> 
> Erik 
> 
> 
> 
> 
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