[PATCH v2] powerpc: Blacklist GCC 5.4 6.1 and 6.2
segher at kernel.crashing.org
Tue Feb 14 02:44:37 AEDT 2017
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
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?
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