[ovs-dev] OVS compiling issue(gcc version 6.5.0 )

[Ben Pfaff]

Oh, yes, "configure" checks for compiler warning support, so if you
change the compiler it is necessary to re-run configure.

On Tue, Jun 04, 2019 at 07:38:52AM +0000, Yanqin Wei (Arm Technology China) wrote:
> Hi Ben,
> 
> After reconfigure the compiler: CC=gcc , this issue is solved.  I tried to reproduce it and found reproducing condition is to switch default gcc version after running configure script.
> 1. default gcc is gcc-8, running the configure script.
> 2. change the default gcc to gcc-6
> 3. building  <--- compiling error
> 
> 4. specific C compiler by configure script: compiler CC=gcc  <--  building success
> 5. change default gcc to gcc-8 and running the configure script
> 6  change default gcc to gcc-6 & building <-- compiling error
> 
> In the config.log after step 3, the detected gcc version is 8.2, so it choose some unsupported compiler option for gcc-6.
> configure:4038: checking for C compiler version
> configure:4047: gcc --version >&5
> gcc (GCC) 8.2.0
> Copyright (C) 2018 Free Software Foundation, Inc.
> 
> So I think it should not be a bug.  It is a configure issue. Thanks for your support.
> 
> Best Regards,
> Wei Yanqin
> 
> -----Original Message-----
> From: Ben Pfaff <blp at ovn.org>
> Sent: Tuesday, June 4, 2019 7:11 AM
> To: Yanqin Wei (Arm Technology China) <Yanqin.Wei at arm.com>
> Cc: ovs-discuss at openvswitch.org; dev at openvswitch.org
> Subject: Re: [ovs-dev] OVS compiling issue(gcc version 6.5.0 )
> 
> On Mon, Jun 03, 2019 at 11:18:23AM +0000, Yanqin Wei (Arm Technology China) wrote:
> > I am trying to compile OVS(master branch) via gcc 6.5.0, but there is gcc option error.
> > gcc: error: unrecognized command line option '-Wmultistatement-macros'; did you mean '-Wunused-macros'?
> 
> What's in config.log?
> 
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