Forum: ARM programming with GCC/GNU tools Problem linking sqrt()

von James A. (Company: PreMecha) (jimmi1234)

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I'm using the Yagarto toolchain to compile for an AT91SAM7x256.
I'm getting a link error for the sqrt() function. I attached a simple 
example of the problem. The problem only applies to the functions in 
math.h that are non reentrant. E.g. fabs() links but sqrt(),fmod(),pow() 
don't link. I tried using -lm but it makes no difference.

Can anyone explain what is going wrong?

arm-none-eabi-gcc -g -Os -nostartfiles -Wl,--gc-sections,-lm 
-T"./at91lib/boards/at91sam7x-ek/at91sam7x256/flash.lds" -o 
obj/flash_board_cstartup.o obj/flash_cp15_asm.o obj/flash_main.o 
obj/flash_usart.o obj/flash_led.o obj/flash_stdio.o obj/flash_dbgu.o 
obj/flash_pio.o obj/flash_aic.o obj/flash_pio_it.o obj/flash_pit.o 
obj/flash_tc.o obj/flash_pmc.o obj/flash_cp15.o 
obj/flash_board_memories.o obj/flash_board_lowlevel.o
obj/flash_main.o: In function `main':
C:\eclipse\workspace\AT91Demo/./src/main.c:84: undefined reference to 

von hp-freund (Guest)

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Question 13.26


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