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

[Thomas Monjalon]

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 at 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.