Hello codec2 developers,

I wonder if we  could/should move codec2_fifo.h and fifo.c to the stm32
directory, as it is used exclusively there and clashes with some library
functions called fifo_read and fifo_write in the gcc library we are
using in UHSDR. Since the fifo functions are not used right in the
normal code, we simply don't include them in the builds. So not a direct
issue.

But to be able to use the fifo function in the UHSDR firmware we would
alternatively have to rename the fifo functions in order to avoid the
name clash. I did that, but unfortunately I am right now not able to
build the stm32 code since cmake is not happy, (and I am not an cmake
expert). So I decided this as to risky since I have no way to test my
changes. I dropped that idea for now but in the long run this might be
the best idea.

Any thoughts on that? Keep as is, Move to stm32/src or change function
names to be a little more specific?

Anyway, not a direct problem for us in UHSDR.


But what I get might when compiling for the UHSDR firmware as warning
while linking could be a real problem:

In function 'ofdm_demod',
    inlined from 'freedv_comprx_700d.constprop' at
../drivers/freedv/freedv_api.c:1808:9,
    inlined from 'freedv_comprx.constprop' at
../drivers/freedv/freedv_api.c:1983:14:
../drivers/freedv/ofdm.c:837:23: warning: argument 1 value '4294967288'
exceeds maximum object size 2147483647 [-Walloc-size-larger-than=]
         complex float work[(en - st)];
                       ^
../drivers/freedv/ofdm.c: In function 'freedv_comprx.constprop':
../drivers/freedv/ofdm.c:837:23: note: in a call to built-in allocation
function '__builtin_alloca_with_align'

This error may only be visible when compiling with higher optimization
levels and a fixed mode (which we do, I compiled for mode 700D only), so
that the compiler can do all the math when compiling, and it gets 
4294967288 which translates in two-complement to -8 btw.
I don't get this, when I compile the codec2-dev source code on Linux for
the x86 architecture.

Regards,
Danilo




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