tree 79bfdaadfc1548826651b9b0378e70e60cdc7720
parent bffd2020a972a188750e5cf4b9566950dfdf25a2
author Michal Marek <mmarek@suse.cz> 1304333475 +0200
committer Michal Marek <mmarek@suse.cz> 1304412654 +0200

kbuild: Fix passing -Wno-* options to gcc 4.4+

Starting with 4.4, gcc will happily accept -Wno-<anything> in the
cc-option test and complain later when compiling a file that has some
other warning. This rather unexpected behavior is intentional as per
http://gcc.gnu.org/PR28322, so work around it by testing for support of
the opposite option (without the no-). Introduce a new Makefile function
cc-disable-warning that does this and update two uses of cc-option in
the toplevel Makefile.

Reported-and-tested-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Michal Marek <mmarek@suse.cz>