Use of malloc primitives in Genode

[Stefan Kalkowski]

*while looking at Norman's mail*: ok, thats my fault I missed the
malloc/free implementation in 'mini_c', so it's just about C/C++ linkage
differences.

On 03/15/2011 09:27 PM, Amadeo Cuadrado wrote:
> Thanks Stefan for your answer.
> 
> Would it be possible to statically link libc into my project?

With respect to your question: of course, it's possible in general.
I guess you like to use libc on top of Fiasco.OC, where ldso isn't
enabled yet? Otherwise I would recommend you to use ldso instead.

Please try it, by uncommenting the following two lines in
'libc/lib/mk/libc.mk':

SHARED_LIB  = yes
LD_OPT     += --version-script=$(REP_DIR)/src/lib/libc/Version.def

Regards
Stefan

> 
> Amadeo
> 
> 
> -----Original Message-----
> From: Stefan Kalkowski [mailto:stefan.kalkowski at ...1...] 
> Sent: Tuesday, March 15, 2011 1:16 PM
> To: genode-main at lists.sourceforge.net
> Subject: Re: Use of malloc primitives in Genode
> 
> Hello Amadeo,
> 
> if you really want to use stdlib's malloc and free, you'll have to link
> against our 'libc'. The 'mini_c' library you've choosen doesn't provide
> malloc/free. It's just a small dummy library for the png-library in our
> demo-repository, that provides a few string-handling functions.
> 
> If you only need malloc/free without additional libc functionality,
> there is a simple implementation in our C++ support-library in:
> 
> base/src/base/cxx/malloc_free.cc
> 
> which uses the heap-allocator from Genode's base environment. To not
> clash with the definition of e.g. the implementation in the 'libc' both
> symbols are hidden after linking the C++ support library, so you cannot
> use it directly, but it might help you as a starting point, if you don't
> want to link against whole 'libc'.
> 
> Regards
> Stefan
> 
> On 03/15/2011 08:53 PM, Amadeo Cuadrado wrote:
>> Hello,
>>
>>  
>>
>> When I try to build the app below in Genode, the following linking error
>> happens:
>>
>>  
>>
>> main.o: In function `main':
>>
>> .../main.cc:6: undefined reference to `malloc(unsigned int)'
>>
>> .../main.cc:8: undefined reference to `free(void*)'
>>
>>  
>>
>> What am I missing here? Thanks!
>>
>>  
>>
>> Amadeo
>>
>>  
>>
>>  
>>
>> ::::::::::::::
>>
>> main.cc
>>
>> ::::::::::::::
>>
>> #include <stdlib.h>
>>
>>  
>>
>> #define N 10
>>
>>  
>>
>> int main(void) {
>>
>>   int *v = (int *) malloc(N*sizeof(int));
>>
>>   for (int i=0; i<N; i++) v[i] = i;
>>
>>   free(v);
>>
>> }
>>
>> ::::::::::::::
>>
>> target.mk
>>
>> ::::::::::::::
>>
>> TARGET = foo
>>
>> SRC_CC = main.cc
>>
>> LIBS   = cxx env mini_c
>>
>>  
>>
>>
>>
>> ------------------------------------------------------------------------------
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>>
>>
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> 

-- 
Stefan Kalkowski
Genode Labs

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