Date: Wed, 23 Aug 2017 17:40:09 +0200 From: Luca Pizzamiglio <luca.pizzamiglio@gmail.com> To: Andrea Venturoli <ml@netfence.it> Cc: Jan Beich <jbeich@freebsd.org>, freebsd-ports@freebsd.org Subject: Re: qemu-aarch64-static Message-ID: <CAB88xy8GdOHti5H6Aq1uzLjqka9EVg5H8pFBhL9UVSyJ0FX2Ag@mail.gmail.com> In-Reply-To: <db3b26b9-fca9-3ce9-7e33-6cc16452e51b@netfence.it> References: <29906b14-8efa-ba65-985a-fd5b90c76b9b@netfence.it> <fucq-0zjk-wny@FreeBSD.org> <cc27572c-22c8-f5b2-6c2d-e563751d6423@netfence.it> <CAB88xy_bvpRRsBHOW6hg13RTACHkc9juMrjEBMW7NRunw_UExg@mail.gmail.com> <db3b26b9-fca9-3ce9-7e33-6cc16452e51b@netfence.it>
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If you want to cross-compile, you need * a proper toolchain * a project that's enable to produce cross-compiled binaries On Tue, Aug 22, 2017 at 8:04 PM, Andrea Venturoli <ml@netfence.it> wrote: > On 08/22/17 18:03, Luca Pizzamiglio wrote: >> >> yes, the qemu emulation of other architecture means that the CPU is >> emulated by software, that's really expensive. >> You should consider around 10x slower or even more. ccache can help a >> lot in this case. > > > Thanks. > So you are confirming my poudriere is running an ARM compiler to produce ARM > code? I've played with cross-compile in the past and that's my understanding. > > What's the use of "-x" when creating a jail then? > What role does the "native cross-toolchain" play? The FreeBSD jail is built using a cross-toolchain (fast) and it contains "cross-binaries" (in case of ARM, in the jail you will have a compiler which host and target are ARM) The packages are built inside a "cross-jail" (slow) The problem is that external ports often don't support cross-compile, so instead of modify tons of ports to add cross-tollchain support, poudriere/FreeBSD exploit features offered by binmisc/qemu to build binaries in a emulated environment. The big drawback is the speed. > I understood that would mean running an AMD64 compiler to cross-build ARM > code... and thought that its timings would be comparable to native building. > Is that wrong? > > bye & Thanks > av.
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