Homebrew Problem with including math.h in a homebrew project

[RGT]

I'm writing a homebrew project in C, and including math.h just doesn't work for me. I have "#include <math.h>" in there, but when I try to use a function from it like cos() or sin() I get an error while trying to build it that looks like this:

d:/devkitpro/devkitarm/bin/../lib/gcc/arm-none-eabi/11.1.0/../../../../arm-none-eabi/bin/ld.exe: C:/Users/rgt/Documents/C_Language/NDS_Project/source/main.c:84: undefined reference to `sin'
collect2.exe: error: ld returned 1 exit status

This is the line mentioned in the above.

double Y_Location = radius * sin(Convert);

Does anyone know what could be wrong? I have no idea how to fix this and get math.h working in my project.

 

[Nowa]

Hi, could you show what command you use to compile your code ?

 

[Xanthe]

add -lm argument when you run the code

 

[elhobbs]

add -lm argument when you run the code

If you are using the standard devkitpro makefile then add this to LIBS

#---------------------------------------------------------------------------------
# any extra libraries we wish to link with the project
#---------------------------------------------------------------------------------
LIBS    :=    -lfat -lnds9 -lm

 

[RGT]

If you are using the standard devkitpro makefile then add this to LIBS

#---------------------------------------------------------------------------------
# any extra libraries we wish to link with the project
#---------------------------------------------------------------------------------
LIBS    :=    -lfat -lnds9 -lm

Thanks! This fixed the problem I was having.