On Mon, Dec 01, 2014 at 04:10:35PM +0100, Richard Biener wrote:
> On Mon, 1 Dec 2014, Ulrich Weigand wrote:
>
> > Richard Biener wrote:
> >
> > > * Makefile.in (gimple-match.o-warn): Remove -Wno-unused-parameter,
> > > add -Wno-unused-but-set-variable.
> >
> > This seems to cause
> >
> > cc1plus: error: unrecognized command line option
> > "-Wno-unused-but-set-variable"
> >
> > make[3]: *** [gimple-match.o] Error 1
> >
> >
> >
> > in stage1 when bootstrapping on SLES 11 (gcc 4.3.4 host compiler).
>
> Oh. Hmm, so I guess
>
> build/gengtype-lex.o-warn = -Wno-error
> gengtype-lex.o-warn = -Wno-error
>
> and friends are also incorrect for host compilers that do not know
> -Wno-error? Which means we need configure checks and substitutes
> for all -Wno-X we use. 4.3 has -Wunused so I can just replace
> -Wno-unused-variable -Wno-unused-but-set-variable with
> -Wno-unused as a quick fix for you. Will do that now (I didn't
> want to use -Wno-error because that makes the compile quite
> uselessly verbose and fails to diagnose real issues).
No, -Wno-error or -Wno-unused in there is just fine.
$($(@D)-warn) and $($@-warn) are only added to GCC_WARN_C{,XX}FLAGS vars
and those are added only if the compiler is GCC.
Jakub
