Re: [dpdk-dev] [dpdk-ci] [PATCH] eal/windows: fix build warnings in MinGW

[Lincoln Lavoie <lylavoie@iol.unh.edu>]

Is that related to a recent patch (I think it was David's, but don't quote
me on that) that enabled a debug build mode when it sees git repo info
within the build root?

Cheers,
Lincoln

On Mon, Apr 19, 2021 at 4:09 PM Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
wrote:

> 2021-04-19 15:29 (UTC-0400), Aaron Conole:
> > Thomas Monjalon <thomas@monjalon.net> writes:
> >
> > > 19/04/2021 20:06, Tal Shnaiderman:
> > >> > > 2021-04-18 19:04 (UTC+0000), Tal Shnaiderman:
> > >> > > > > 18/04/2021 19:08, Tal Shnaiderman:
> > >> > > > > > the strncasecmp marco defined in rte_os_shim.h is already
> > >> > > > > > defined in MinGW-w64, as a result the compiler prints out
> the
> > >> > > > > > warning below on function redefinition whenever compiling a
> file
> > >> > > > > > including the
> > >> > > header.
> > >> > > > > >
> > >> > > > > > ..\lib/librte_eal/windows/include/rte_os_shim.h:21:
> > >> > > > > > warning: "strncasecmp" redefined #define strncasecmp(s1, s2,
> > >> > > > > > count) _strnicmp(s1, s2, count)
> > >> > > > >
> > >> > > > > Why the tests are passing? Are we allowing warnings in build
> test?
> > >> > > >
> > >> > > > It's a good question, I see CI is passing without warnings,
> Dmitry
> > >> > > > can you
> > >> > > reproduce it?
> > >> > > >
> > >> > > > On my side the collision is with the following file:
> > >> > > >
> > >> > > > C:/mingw-w64/x86_64/mingw64/x86_64-w64-
> > >> > > mingw32/include/string.h:119:
> > >> > > > note: this is the location of the previous definition  #define
> > >> > > > strncasecmp _strnicmp
> > >> > > >
> > >> > > > I'm using:
> > >> > > > -gcc (x86_64-win32-seh-rev0, Built by MinGW-W64 project) 8.1.0
> > >> > > > -meson
> > >> > > > 0.53.2
> > >> > >
> > >> > > I can't reproduce it using the same versions.
> > >> > > Do you invoke meson with other options than "-Dexamples=..."?
> > >> >
> > >> > This is the meson line I'm using:
> > >> >
> > >> > meson "-Dexamples=helloworld" build --wipe --default-library=static
> --
> > >> > buildtype debug
> > >> >
> > >> > The problem however is that MinGW's string.h defines the macro in
> line 119,
> > >> > for some reason my build includes it and the rest doesn't.
> > >>
> > >> Hi Dmitry,
> > >>
> > >> I also noticed warnings in clang on my setup that are related to
> rte_os_shim.h:
> > >>
> > >> [185/314] Compiling C object drivers/a715181@@tmp_rte_common_mlx5@sta
> /common_mlx5_mlx5_common_mp.c.obj.
> > >> In file included from ../drivers/common/mlx5/mlx5_common_mp.c:13:
> > >> In file included from ..\drivers\common/mlx5/mlx5_common_utils.h:8:
> > >> In file included from ..\drivers\common/mlx5/mlx5_common.h:17:
> > >> ..\lib/librte_eal/windows/include\rte_os_shim.h:22:51: warning:
> > >> token pasting of ',' and __VA_ARGS__ is a GNU extension
> > >> [-Wgnu-zero-variadic-macro-arguments]
> > >> #define open(path, flags, ...) _open(path, flags, ##__VA_ARGS__)
> > >>                                                   ^
> > >> However don't see it in CI, I'm using clang version 9.0.1
> > >
> > > It seems we should improve our CI.
> > > Please open suggestions in the CI bugzilla.
> >
> > Please do.
> >
> > Will this only be caught by mingw64 on windows?  Will we get the same
> > issues with a linux mingw install?  I'm guessing yes, but don't know
> > mingw very well.  We may be able to install the mingw package under our
> > github actions pipeline.
>
> Yes, Linux MinGW-w64 produces the same warning (about strncasecmp).
> __VA_ARGS__ warning won't show up with GNU compiler, obviously.
> It may with ICC, but I don't have it to check.
>
> I figured out it's not --default-library=static, but --buildtype=debug that
> caues the arning to appear, my mistake in previous message.
>


-- 
*Lincoln Lavoie*
Principal Engineer, Broadband Technologies
21 Madbury Rd., Ste. 100, Durham, NH 03824
lylavoie@iol.unh.edu
https://www.iol.unh.edu
+1-603-674-2755 (m)
<https://www.iol.unh.edu>