Description of problem:
I just ran flac over a set of WAV files ripped from a CD.  The output was noisy, with lots of lines like this:

FLAC__lpc_quantize_coefficients: negative shift=-1 order=12 cmax=2180.327393

I found that in the source code, in src/libFLAC/lpc.c:

#ifndef NDEBUG
                flac_fprintf(stderr,"FLAC__lpc_quantize_coefficients: negative shift=%d order=%u cmax=%f\n", *shift, order, cmax);
#endif

This means that flac was built without NDEBUG being defined.  Was that intentional?  In CMakeLists.txt, NDEBUG is added to the build flags for release mode, which suggests that flac was not built in release mode.  Perhaps cmake needs to be invoked with -DCMAKE_BUILD_TYPE=Release or -DCMAKE_BUILD_TYPE=RelWithDebInfo?

Version-Release number of selected component (if applicable):
flac-1.5.0-4.fc43.x86_64

How reproducible:
Always

Steps to Reproduce:
1. I don't know if this happens for any WAV file, but it does for nearly every track ripped from "The Blue Album" by Pablo Sainz-Villegas
2. For those tracks, I ran "flac --best -e *.wav"

Actual results:
Noisy output, with debug statements interleaved with the output I want to see.

Expected results:
I only want to see progress information, without debug statements.

Additional info: