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Re: [libvirt] [PATCH] virsh: ignore readline -Wstrict-prototypes warning



  Roman Bogorodskiy wrote:

>   Ján Tomko wrote:
> 
> > On Fri, May 26, 2017 at 09:49:15PM +0400, Roman Bogorodskiy wrote:
> > >When building with clang 4.0.0, virsh build fails like this:
> > >
> > >gmake[3]: Entering directory '/usr/home/novel/code/libvirt/tools'
> > >  CC       virsh-virsh.o
> > >In file included from virsh.c:45:
> > >In file included from /usr/local/include/readline/readline.h:31:
> > >/usr/local/include/readline/rltypedefs.h:35:22: error: this function declaration is not a prototype [-Werror,-Wstrict-prototypes]
> > >typedef int Function () __attribute__ ((deprecated));
> > >                     ^
> > >                      void
> > >/usr/local/include/readline/rltypedefs.h:36:24: error: this function declaration is not a prototype [-Werror,-Wstrict-prototypes]
> > >typedef void VFunction () __attribute__ ((deprecated));
> > >                       ^
> > >                        void
> > >/usr/local/include/readline/rltypedefs.h:37:26: error: this function declaration is not a prototype [-Werror,-Wstrict-prototypes]
> > >typedef char *CPFunction () __attribute__ ((deprecated));
> > >                         ^
> > >                          void
> > >/usr/local/include/readline/rltypedefs.h:38:28: error: this function declaration is not a prototype [-Werror,-Wstrict-prototypes]
> > >typedef char **CPPFunction () __attribute__ ((deprecated));
> > >                           ^
> > >                            void
> > >In file included from virsh.c:45:
> > >/usr/local/include/readline/readline.h:385:23: error: this function declaration is not a prototype [-Werror,-Wstrict-prototypes]
> > >extern int rl_message ();
> > >                      ^
> > >                       void
> > >5 errors generated.
> > >gmake[3]: *** [Makefile:2823: virsh-virsh.o] Error 1
> > >
> > >Fix that by adding VIR_WARNINGS_NO_STRICT_PROTOTYPES macro that uses
> > >"GCC diagnostic push" to ignore -Wstrict-prototypes and wrapping
> > >readline includes with it and VIR_WARNINGS_RESET.
> > >
> > >Bug report on the readline mailing list:
> > >
> > > http://lists.gnu.org/archive/html/bug-readline/2017-05/msg00004.html
> > >---
> > > src/internal.h     | 4 ++++
> > > tools/virsh.c      | 2 ++
> > > tools/virt-admin.c | 2 ++
> > > 3 files changed, 8 insertions(+)
> > >
> > 
> > ACK
> > 
> > Jan
> 
> Thanks! I decided not to push it before release, it's not critical
> anyway.
> 
> In the meantime, upstream says that this is not going to be changed and
> suggests trying -D_FUNCTION_DEF to avoid this. I'll try the CFLAGS-based
> solution and if this works, I'll submit v2 (as this appears to be more
> clear and compact fix), otherwise will push this one. 

Here goes v2 with a fix I like better:

https://www.redhat.com/archives/libvir-list/2017-June/msg00105.html

Roman Bogorodskiy

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