[PATCH 1/2] [pr53679] libgo: add a --enable-werror configure flag

Mike Frysinger vapier@gentoo.org
Thu Mar 7 06:59:00 GMT 2013


On Wednesday 06 March 2013 10:49:23 Diego Novillo wrote:
> On Tue, Mar 5, 2013 at 12:31 AM, Ian Lance Taylor <iant@google.com> wrote:
> > On Mon, Mar 4, 2013 at 4:11 PM, Mike Frysinger <vapier@gentoo.org> wrote:
> > > On Saturday 26 January 2013 21:40:44 Ian Lance Taylor wrote:
> > >> On Fri, Jan 25, 2013 at 7:20 PM, Mike Frysinger wrote:
> > >> > On Friday 25 January 2013 19:13:55 Ian Lance Taylor wrote:
> > >> >> On Tue, Jan 15, 2013 at 9:45 AM, Mike Frysinger wrote:
> > >> >> > On Tuesday 15 January 2013 09:56:06 Ian Lance Taylor wrote:
> > >> >> >> On Sun, Dec 23, 2012 at 3:30 PM, Mike Frysinger wrote:
> > >> >> >> > diff --git a/libgo/configure.ac b/libgo/configure.ac
> > >> >> >> > index 8cde50b..63d8cbc 100644
> > >> >> >> > --- a/libgo/configure.ac
> > >> >> >> > +++ b/libgo/configure.ac
> > >> >> >> > @@ -50,8 +50,11 @@ AC_PROG_AWK
> > >> >> >> > 
> > >> >> >> >  WARN_FLAGS='-Wall -Wextra -Wwrite-strings -Wcast-qual'
> > >> >> >> >  AC_SUBST(WARN_FLAGS)
> > >> >> >> > 
> > >> >> >> > -dnl FIXME: This should be controlled by
> > >> >> >> > --enable-maintainer-mode.
> > >> >> >> > -WERROR="-Werror"
> > >> >> >> > +AC_ARG_ENABLE(werror, [AS_HELP_STRING([--enable-werror],
> > >> >> >> > +                                      [turns on -Werror
> > >> >> >> > @<:@default=yes@:>@])]) +if test "x$enable_werror" != "xno";
> > >> >> >> > then
> > >> >> >> > +  WERROR="-Werror"
> > >> >> >> > +fi
> > >> >> >> > 
> > >> >> >> >  AC_SUBST(WERROR)
> > >> >> >> >  
> > >> >> >> >  glibgo_toolexecdir=no
> > >> >> >> 
> > >> >> >> Can you say something about when you needed this?  What errors
> > >> >> >> were
> > >> >> >> you seeing?
> > >> >> > 
> > >> >> > the referenced PR describes one:
> > >> >> > /build/src/gcc-4.7.1/libgo/runtime/print.c: In function 'gwrite':
> > >> >> > /build/src/gcc-4.7.1/libgo/runtime/print.c:20:3: error: ignoring
> > >> >> > return value of 'write', declared with attribute
> > >> >> > warn_unused_result
> > >> >> > [-Werror=unused-result] cc1: all warnings being treated as errors
> > >> >> > 
> > >> >> > this bites distros that enable security settings by default (such
> > >> >> > as
> > >> >> > fortify and ssp).  but ignoring even that, i don't believe
> > >> >> > releases
> > >> >> > should build all the time with -Werror -- i'm fine with
> > >> >> > defaulting to
> > >> >> > on as long as there is a configure flag to turn it off which is
> > >> >> > what
> > >> >> > this does like is already handled in much of the sourceware tree.
> > >> >> > -Werror is great for development, but sucks when deployed on
> > >> >> > actual
> > >> >> > systems.  the assumptions made at time of checkin rarely stay
> > >> >> > constant forever (in this case, a changing lib C can easily break
> > >> >> > it). -mike
> > >> >> 
> > >> >> Thanks for the explanation.
> > >> >> 
> > >> >> Committed to mainline.
> > >> > 
> > >> > thanks!  mind if i commit it to gcc-4.6 and gcc-4.7 too ?
> > >> 
> > >> I certainly don't mind.  You should probably get agreement from the
> > >> release managers although this seems safe enough.
> > > 
> > > can you approve merges to the google branches ?  that's really where i
> > > want
> > > this :).
> > 
> > No, I don't work on those branches.  Sorry.
> 
> I committed this patch to google/gcc-4_7 rev 196494.  Feel free to
> commit to google/gcc-4_6 if you need to.

nope, we just need it in 4.7, thanks!
-mike
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