emWin library problem

[pcu]

Posted on November 27, 2013 at 08:30

Hello,

I tried to build on Atollic the precompiled package around the emWin graphical lib(

AN4323

).I build for STM322xG-EVAL, but I get two errors:c:/program files (x86)/atollic/truestudio for arm pro 3.3.0/armtools/bin/../lib/gcc/arm-atollic-eabi/4.6.2/../../../../arm-atollic-eabi/lib/thumb/armv7-m\libm.a(lib_a-w_sqrt.o): In function `sqrt':

w_sqrt.c:(.text.sqrt+0x7a): undefined reference to `__errno'

w_sqrt.c:(.text.sqrt+0x86): undefined reference to `__errno'I have no idea how to resolve this.Thank you,Pierre

[Tesla DeLorean]

Posted on November 27, 2013 at 10:47

__errno is part of the C runtime library, not sure how Atollic handles it but you probably need to include LIBC along with LIBM. One way might be to #include <math.h>, <stdlib.h>, or <sys/errno.h>, etc into your application.

[pcu]

Posted on November 29, 2013 at 10:07

yes If I add libm in the linker settings, it is better.

Thank you.