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Re: [lwip-users] lwip PPP malloc problem
From: |
Rainer Thaden |
Subject: |
Re: [lwip-users] lwip PPP malloc problem |
Date: |
Mon, 21 Jul 2014 15:20:09 +0200 |
User-agent: |
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 |
Am 21.07.2014 14:02, schrieb Simon Goldschmidt:
> Rainer Thaden wrote:
>> Since I need to communicate over serial ports, too, I activated PPP
>> support in lwipopts.h.
>> Now, the linker complains about undefined references to _sbrk which (to
>> me) is a sign for a call to malloc in the libc somewhere.
> Check your linker file if it tells you why _sbrk is wanted. At least gcc has
> some good output in the map file for this. I think I remember to get malloc
> include when calling printf...
>
Thanks Simon, I forgot to mention, I looked into the map file, but it
didn't give me the answer that I was looking for. (see below).
The printf seems to be a good hint. Thanks for that!
Regards,
Rainer
Output from map-file:
c:/progra~1/codesourcery/sourcery_codebench_lite_for_arm_eabi/bin/../lib/gcc/arm-none-eabi/4.7.3/../../../../arm-none-eabi/lib/thumb2\libc.a(lib_a-malloc.o)
c:/progra~1/codesourcery/sourcery_codebench_lite_for_arm_eabi/bin/../lib/gcc/arm-none-eabi/4.7.3/../../../../arm-none-eabi/lib/thumb2\libc.a(lib_a-rand.o)
(malloc)
c:/progra~1/codesourcery/sourcery_codebench_lite_for_arm_eabi/bin/../lib/gcc/arm-none-eabi/4.7.3/../../../../arm-none-eabi/lib/thumb2\libc.a(lib_a-mallocr.o)
c:/progra~1/codesourcery/sourcery_codebench_lite_for_arm_eabi/bin/../lib/gcc/arm-none-eabi/4.7.3/../../../../arm-none-eabi/lib/thumb2\libc.a(lib_a-malloc.o)
(_malloc_r)
c:/progra~1/codesourcery/sourcery_codebench_lite_for_arm_eabi/bin/../lib/gcc/arm-none-eabi/4.7.3/../../../../arm-none-eabi/lib/thumb2\libc.a(lib_a-mlock.o)
c:/progra~1/codesourcery/sourcery_codebench_lite_for_arm_eabi/bin/../lib/gcc/arm-none-eabi/4.7.3/../../../../arm-none-eabi/lib/thumb2\libc.a(lib_a-mallocr.o)
(__malloc_lock)
c:/progra~1/codesourcery/sourcery_codebench_lite_for_arm_eabi/bin/../lib/gcc/arm-none-eabi/4.7.3/../../../../arm-none-eabi/lib/thumb2\libc.a(lib_a-sbrkr.o)
c:/progra~1/codesourcery/sourcery_codebench_lite_for_arm_eabi/bin/../lib/gcc/arm-none-eabi/4.7.3/../../../../arm-none-eabi/lib/thumb2\libc.a(lib_a-mallocr.o)
(_sbrk_r)
c:/progra~1/codesourcery/sourcery_codebench_lite_for_arm_eabi/bin/../lib/gcc/arm-none-eabi/4.7.3/../../../../arm-none-eabi/lib/thumb2\libc.a(lib_a-freer.o)
c:/progra~1/codesourcery/sourcery_codebench_lite_for_arm_eabi/bin/../lib/gcc/arm-none-eabi/4.7.3/../../../../arm-none-eabi/lib/thumb2\libc.a(lib_a-malloc.o)
(_free_r)
c:/progra~1/codesourcery/sourcery_codebench_lite_for_arm_eabi/bin/../lib/gcc/arm-none-eabi/4.7.3/../../../../arm-none-eabi/lib/thumb2\libc.a(lib_a-reent.o)
c:/progra~1/codesourcery/sourcery_codebench_lite_for_arm_eabi/bin/../lib/gcc/arm-none-eabi/4.7.3/../../../../arm-none-eabi/lib/thumb2\libc.a(lib_a-sbrkr.o)
(errno)