test_qtreetbl.c will segfault with gcc >= 10

[Fullaxx]

make test will fail when qlibc is compiled with gcc >= 10.
Under this case, test_qtreetbl.c will compile but will segfault during execution.
I believe that it is caused by the unused return true; of drawtree().
test_qtreetbl_gcc10.txt
test_qtreetbl_gcc11.txt
test_qtreetbl_gcc12.txt

[Fullaxx]

sorry, this isn't quite right and needs more investigation.

[Fullaxx]

Apparently the unused return value is not the root cause.
It seems that when test_qtreetbl.c is compiled with -O2 the drawtree() will produce a segfault,
When I remove the -O2 optimizations flag to get better debugging symbols, drawtree() functions normally.
Commenting out the drawtree() does avoid the segfault, but I don't have a good explanation as to the root cause.
If anyone has any insight here, that would be greatly appreciated.

[wolkykim]

Hi Thanks for the report.
This is addressed by #95

[Fullaxx]

awesome, thanks! verified that works with gcc-12