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From: Thomas Monjalon <thomas@monjalon.net>
To: Juraj Linkeš <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>
Subject: Re: [dpdk-dev] [PATCH v4 1/3] build: add aarch64 clang to meson cross-compile
Date: Wed, 20 Jan 2021 11:21:50 +0100
Message-ID: <1834029.KMe6SH2nP9@thomas> (raw)
In-Reply-To: <081daf7d51bf4af9a210a745eeae277f@pantheon.tech>

20/01/2021 09:24, Juraj Linkeš:
> From: Thomas Monjalon <thomas@monjalon.net>
> > 19/01/2021 09:33, Juraj Linkeš:
> > > 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 stdlib.
> > >
> > > 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 specific 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 builds. 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 that has to come from elsewhere (such as gcc) and thus we have to provide the paths.

Can it be done with the option -Dc_args?


> > [...]
> > > +c_args = ['-target', 'aarch64-linux-gnu', '--sysroot',
> > > +'/usr/aarch64-linux-gnu'] c_link_args = ['-target',
> > > +'aarch64-linux-gnu', '-fuse-ld=lld', '--gcc-toolchain=/usr']




  reply	other threads:[~2021-01-20 10:21 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-01 10:20 [dpdk-dev] [PATCH 0/2] aarch64 clang cross compilation Juraj Linkeš
2020-10-01 10:20 ` [dpdk-dev] [PATCH 1/2] ci: add aarch64 clang cross-compilation builds Juraj Linkeš
2020-10-01 10:20 ` [dpdk-dev] [PATCH 2/2] doc: add clang to aarch64 cross build guide Juraj Linkeš
2020-10-01 10:30 ` [dpdk-dev] [PATCH v2 0/3] aarch64 clang cross compilation Juraj Linkeš
2020-10-01 10:30   ` [dpdk-dev] [PATCH v2 1/3] build: add aarch64 clang to meson cross-compile Juraj Linkeš
2020-10-04  8:29     ` Jerin Jacob
2020-10-05 10:57       ` Juraj Linkeš
2020-10-05 14:26         ` Jerin Jacob
2020-10-22 13:40           ` Juraj Linkeš
2020-10-01 10:30   ` [dpdk-dev] [PATCH v2 2/3] ci: add aarch64 clang cross-compilation builds Juraj Linkeš
2020-10-01 13:31     ` Aaron Conole
2020-10-01 14:43       ` Juraj Linkeš
2020-10-01 10:30   ` [dpdk-dev] [PATCH v2 3/3] doc: add clang to aarch64 cross build guide Juraj Linkeš
2020-10-02  9:38   ` [dpdk-dev] [PATCH v3 0/3] aarch64 clang cross compilation Juraj Linkeš
2020-10-02  9:38     ` [dpdk-dev] [PATCH v3 1/3] build: add aarch64 clang to meson cross-compile Juraj Linkeš
2020-12-22  9:58       ` Ruifeng Wang
2020-10-02  9:38     ` [dpdk-dev] [PATCH v3 2/3] ci: add aarch64 clang cross-compilation builds Juraj Linkeš
2020-10-02  9:38     ` [dpdk-dev] [PATCH v3 3/3] doc: add clang to aarch64 cross build guide Juraj Linkeš
2020-12-22  7:34       ` Ruifeng Wang
2021-01-19  8:33     ` [dpdk-dev] [PATCH v4 0/3] aarch64 clang cross compilation Juraj Linkeš
2021-01-19  8:33       ` [dpdk-dev] [PATCH v4 1/3] build: add aarch64 clang to meson cross-compile Juraj Linkeš
2021-01-19 16:08         ` Thomas Monjalon
2021-01-20  8:24           ` Juraj Linkeš
2021-01-20 10:21             ` Thomas Monjalon [this message]
2021-01-20 10:30               ` Juraj Linkeš
2021-01-20 10:34                 ` Thomas Monjalon
2021-01-21 15:02                   ` Juraj Linkeš
2021-01-19  8:33       ` [dpdk-dev] [PATCH v4 2/3] ci: add aarch64 clang cross-compilation builds Juraj Linkeš
2021-01-19  8:33       ` [dpdk-dev] [PATCH v4 3/3] doc: add clang to aarch64 cross build guide Juraj Linkeš
2021-01-21 15:51       ` [dpdk-dev] [PATCH v5 0/3] aarch64 clang cross compilation Juraj Linkeš
2021-01-21 15:51         ` [dpdk-dev] [PATCH v5 1/3] build: add aarch64 clang to meson cross-compile Juraj Linkeš
2021-01-21 15:51         ` [dpdk-dev] [PATCH v5 2/3] ci: add aarch64 clang cross-compilation builds Juraj Linkeš
2021-01-21 15:51         ` [dpdk-dev] [PATCH v5 3/3] doc: add clang to aarch64 cross build guide Juraj Linkeš
2021-01-26 10:24           ` Thomas Monjalon
2021-01-26 11:45         ` [dpdk-dev] [PATCH v5 0/3] aarch64 clang cross compilation Thomas Monjalon

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