Hi Cyril, On Mon, Feb 13, 2017 at 02:35:36PM +1100, Cyril Bur wrote: > A bug in the -02 optimisation of GCC 5.4 6.1 and 6.2 causes > setup_command_line() to not pass the correct first argument to strcpy > and therefore not actually copy the command_line.
There is no such thing as an "-O2 optimisation". > At the time of writing GCC 5.4 is the most recent and is affected. GCC > 6.3 contains the backported fix, has been tested and appears safe to > use. 6.3 is (of course) the newer release; 5.4 is a maintenance release of a compiler that is a year older. > +# - gcc-5.4, 6.1, 6.2 don't copy the command_line around correctly > + echo -n '*** GCC-5.4 6.1 6.2 have a bad -O2 optimisation ' ; \ > + echo 'which will cause lost command_line options (at least).' ; > \ Maybe something more like "GCC 5.4, 6.1, and 6.2 have a bug that results in a kernel that does not boot. Please use GCC 6.3 or later.". Please mention the GCC PR # somewhere in the code, too? Segher