Re: [PATCH libdrm 1/7] meson, configure: add warning when using undefined preprocessor tokens

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Quoting Eric Engestrom (2018-01-26 09:17:43)
> On Friday, 2018-01-26 17:14:06 +0000, Emil Velikov wrote:
> > On 26 January 2018 at 11:30, Eric Engestrom <eric.engestrom@xxxxxxxxxx> wrote:
> > > Signed-off-by: Eric Engestrom <eric.engestrom@xxxxxxxxxx>
> > > ---
> > >  configure.ac | 2 +-
> > >  meson.build  | 2 +-
> > >  2 files changed, 2 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/configure.ac b/configure.ac
> > > index 35378b3384290f8e1e26..3fc4e7794cd974171c0a 100644
> > > --- a/configure.ac
> > > +++ b/configure.ac
> > > @@ -197,7 +197,7 @@ dnl skipped and all flags rechecked.  So there's no need to do anything
> > >  dnl else.  If for any reason you need to force a recheck, just change
> > >  dnl MAYBE_WARN in an ignorable way (like adding whitespace)
> > >
> > > -MAYBE_WARN="-Wall -Wextra \
> > > +MAYBE_WARN="-Wall -Wextra -Wundef \
> > >  -Wsign-compare -Werror-implicit-function-declaration \
> > >  -Wpointer-arith -Wwrite-strings -Wstrict-prototypes \
> > >  -Wmissing-prototypes -Wmissing-declarations -Wnested-externs \
> > > diff --git a/meson.build b/meson.build
> > > index d7a50cf96f905b53d37a..a410627fbf16a2c6d748 100644
> > > --- a/meson.build
> > > +++ b/meson.build
> > > @@ -203,7 +203,7 @@ if cc.has_function('open_memstream')
> > >  endif
> > >
> > >  warn_c_args = []
> > > -foreach a : ['-Wall', '-Wextra', '-Wsign-compare',
> > > +foreach a : ['-Wall', '-Wextra', '-Wsign-compare', '-Wundef',
> > 
> > Unless we have [m]any undef warnings, I'd just make that Werror=undef,
> > across build systems.
> 
> This is what patch 6/7 of this series does.
> I chose to make it a two step thing, first enable the warning, fix the
> code, and then turn the warning into an error.
> 
> I guess I could just skip this patch, and introduce the warning as an
> error in 6/7.
> 
> > 
> > -Emil

I'd either leave 1/7 as-is or drop it completely, so we can bisect across this
series. I don't care which.

Dylan

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