Is there any framebuffer testcases?

Sebastian Huber sebastian.huber at
Thu Apr 14 06:30:43 UTC 2016

On 14/04/16 08:23, Chris Johns wrote:
> On 14/04/2016 16:09, Sebastian Huber wrote:
>> On 14/04/16 08:04, Chris Johns wrote:
>>> On 14/04/2016 15:56, Sebastian Huber wrote:
>>>> In case this is important, then we should add a test case to the RTEMS
>>>> test suite.
>>> A test is a good idea.
>>> How would you write a test which checks all the possible externals
>>> used in newlib and I suppose gcc, indirectly via the apis or
>>> explicitly? I am thinking explicitly but how do we collect all the
>>> symbols and check they have no moved?
>> It has to work automatically.
> I keep pressing the button but nothing is happening ... ok I will do 
> it. :)
>> I think a lot of symbols are missing in this file.
> I suppose the list is a unique set of all external symbols which do 
> not internally resolve with in the tool set libraries. I suppose I can 
> assume multlib variants all have the same unresolved symbols and can 
> filter duplicates.
> I still not see how to write a suitable test. All you end up doing is 
> testing the linker works and RTEMS is not missing any symbols. Any idea? 

GCC uses link-time tests to check for operating system features. At 
least for libstdc++ some features are unsupported since some symbols are 
not defined (only declared in header files) during GCC build. Let U be 
the set of all undefined symbols in libc, libm and libgcc. Let D be the 
set of all defined symbols in libc, libm, libgcc. Then U \ D must go 
into crt0.c. Also, these symbols must be defined by librtemscpu or 

Sebastian Huber, embedded brains GmbH

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