Externally provided __getreent

[Sebastian Huber]

On 19/05/17 16:44, Olivier Desenfans wrote:
> newlib apparently does not let me do that; you can override the
> default implementation (in sys/reent/getreent.c) by implementing your
> own version (in sys/myos/getreent.c). I tried to declare that custom
> version as a weak symbol so that the linker would replace it with the
> version in our custom API but to no avail. Interestingly the linker
> does not throw a duplicate symbol error. There seems to be some magic
> trickery in the build system that prevents me from achieving this.

This is not how weak symbols work. If the linker has no reason to look 
for your __getreent() function (e.g. because it found the weak version 
first and nothing else pulled in the module containing your 
implementation), then it will not end up in the executable.

-- 
Sebastian Huber, embedded brains GmbH

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