I use gcc-9
from CentOS
:
$ /opt/rh/devtoolset-9/root/usr/bin/gcc --version
gcc (GCC) 9.3.1 20200408 (Red Hat 9.3.1-2)
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
And I found if using -O3
compile option, for some Variable-length array in C
programming language, gcc
will report following warning:
warning: argument to variable-length array may be too large [-Wvla-larger-than=]
596 | uint8_t header[header_size];
| ^~~~~~~~~~~~~~~~~~
If not using -O3
option, the warning won’t be generated.