about the link error with arm-none-eabi on the eclipse environment.

[neweins]

Hello all

I'm struggling with link errors, "undefined referencce atan2" as well as all math library. I still dont know why it is occurred these errors. I configured the eclipse compile environment with the gnu arm tool using your doc, application note ver1.2. May you help me?

[maxpaynner]

I had this same problem.

The solution was:

1- Link with GCC instead of LD (some guys recommend this, dunno where I read it, but seems to work). In your makefile replace

LD       		:= "$(GNU_INSTALL_ROOT)/bin/$(GNU_PREFIX)-ld"

With

LD       		:= "$(GNU_INSTALL_ROOT)/bin/$(GNU_PREFIX)-gcc"

2- Manually add the math lib to your libs

#link math library.. dunno why this isn't done automatically

LIBS += $(GNU_INSTALL_ROOT)/arm-none-eabi/lib/thumb/libm.a

I don't know why the linker doesn't automatically link the library but this seemed to work for me.

[Raphael]

Worked just fine with LD as a linker command for me (ARM GCC 4.9.3). See my answer.