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Wed, 20 Jan 2021 05:34:45 -0500 (EST) From: Thomas Monjalon <thomas@monjalon.net> To: Juraj =?utf-8?B?TGlua2XFoQ==?= <juraj.linkes@pantheon.tech> Cc: "david.marchand@redhat.com" <david.marchand@redhat.com>, "aconole@redhat.com" <aconole@redhat.com>, "maicolgabriel@hotmail.com" <maicolgabriel@hotmail.com>, "jerinjacobk@gmail.com" <jerinjacobk@gmail.com>, "ferruh.yigit@intel.com" <ferruh.yigit@intel.com>, "Ruifeng.Wang@arm.com" <Ruifeng.Wang@arm.com>, "dev@dpdk.org" <dev@dpdk.org>, "bruce.richardson@intel.com" <bruce.richardson@intel.com> Date: Wed, 20 Jan 2021 11:34:44 +0100 Message-ID: <1625239.tDLFZOx7cW@thomas> In-Reply-To: <e59d0d0b37924393b22a0da6c3996a0f@pantheon.tech> References: <1601631508-5307-1-git-send-email-juraj.linkes@pantheon.tech> <1834029.KMe6SH2nP9@thomas> <e59d0d0b37924393b22a0da6c3996a0f@pantheon.tech> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="UTF-8" Subject: Re: [dpdk-dev] [PATCH v4 1/3] build: add aarch64 clang to meson cross-compile X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions <dev.dpdk.org> List-Unsubscribe: <https://mails.dpdk.org/options/dev>, <mailto:dev-request@dpdk.org?subject=unsubscribe> List-Archive: <http://mails.dpdk.org/archives/dev/> List-Post: <mailto:dev@dpdk.org> List-Help: <mailto:dev-request@dpdk.org?subject=help> List-Subscribe: <https://mails.dpdk.org/listinfo/dev>, <mailto:dev-request@dpdk.org?subject=subscribe> Errors-To: dev-bounces@dpdk.org Sender: "dev" <dev-bounces@dpdk.org> 20/01/2021 11:30, Juraj Linke=C5=A1: > From: Thomas Monjalon <thomas@monjalon.net> > > 20/01/2021 09:24, Juraj Linke=C5=A1: > > > From: Thomas Monjalon <thomas@monjalon.net> > > > > 19/01/2021 09:33, Juraj Linke=C5=A1: > > > > > Create meson cross-file arm64_armv8_linux_clang_ubuntu1804. > > > > > > > > Why is it specific to Ubuntu 18.04? > > > > I don't want to add specifc cross files per distributions. > > > > > > > > > Use clang/LLVM toolchain with sysroot pointing to gcc cross stdli= b. > > > > > > > > > > The sysroot path must be in the cross-file so that Clang can find > > > > > the proper headers: > > > > > * setting CFLAGS, LDFLAGS or -Dc_args, -Dc_link_args doesn't > > > > > affect cross builds (only native builds). Support added in 0.51.0. > > > > > * setting pkg-config vars only affects lib searching, not includes > > > > > * splitting the cross-file into two (one with clang info, one with > > > > > paths) doesn't work. Support added in 0.52.0. > > > > > > > > I don't understand the explanations above. > > > > Please explain what is the bug and how it is fixed. > > > > > > > > > > I guess the missing piece is that the sysroot path is the ubuntu spec= ific part. > > The explanations illustrate why we can't have a generic cross file with= the > > current meson version - there's no way to pass the paths to cross build= s. Now > > that I think about it, the commit message needs a rewrite - I should've > > mentioned that clang/llvm doesn't provide it's own standard c lib, so t= hat has to > > come from elsewhere (such as gcc) and thus we have to provide the paths. > >=20 > > Can it be done with the option -Dc_args? > >=20 >=20 > Not in Meson 0.47.1, it's explained in the commit msg: > * setting CFLAGS, LDFLAGS or -Dc_args, -Dc_link_args doesn't=20 > affect cross builds (only native builds). Support added in 0.51.0. So I suggest to make it clearer :) One proposal: * setting CFLAGS/LDFLAGS variables or using -Dc_args/-Dc_link_args options do not work on cross builds until Meson 0.51.0. > > > > [...] > > > > > +c_args =3D ['-target', 'aarch64-linux-gnu', '--sysroot', > > > > > +'/usr/aarch64-linux-gnu'] c_link_args =3D ['-target', > > > > > +'aarch64-linux-gnu', '-fuse-ld=3Dlld', '--gcc-toolchain=3D/usr'] > >=20 > >=20 > >=20 >=20 >=20