Date: Mon, 1 Dec 2014 22:05:29 -0700 From: Warner Losh <wlosh@netflix.com> To: Baptiste Daroussin <bapt@FreeBSD.org> Cc: current@FreeBSD.org Subject: Re: External toolchain support Message-ID: <F29A9EDB-A3DF-4D63-9EC4-598F64675416@gmail.com> In-Reply-To: <20141129150440.GC88765@ivaldir.etoilebsd.net> References: <20141129150440.GC88765@ivaldir.etoilebsd.net>
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> On Nov 29, 2014, at 8:04 AM, Baptiste Daroussin <bapt@FreeBSD.org> wrote: > > Hi all, > > It is now possible to use an external toolchain to build the kernel and base > (tested with gcc 4.9.1 and latest binutils) > > Of course a lot of work is needed to make it build cleanly (aka lots of warning > to fix). > > What have been tested so far: > - sparc64 kernel + world > - amd64 kernel + world > - powerpc64 kernel + world > > mips cannot be tested because upstream gcc never heard of FreeBSD running on > mips, and I did not receive any patches for mips. I have patches for 4.8 or so knocking around somewhere... > for amd64, in the kernel two things had to be removed from the build: > - aesni: (it request a header which is compiler specific and on recent gcc > will end up including stdlib.h which gives errors because kernel version of free > and malloc are not compatible with the version defined in stdlib.h) > - hptmv: I had to remove it from GENERIC and kernel building. > > The result is: > > $ sysctl kern.ostype kern.osrelease kern.osrevision kern.compiler_version > > kern.ostype: FreeBSD > kern.osrelease: 11.0-CURRENT > kern.osrevision: 199506 > kern.compiler_version: gcc version 4.9.1 (FreeBSD Ports Collection for amd64) > > so yes it boots and runs > > How to do you own testing: > in the ports tree/packages (the amd64 version will appear in packages next week) > install: > amd64-xtoolchain-gcc or powerpc64-xtoolchain-gcc or sparc64-xtoolchain-gcc > > if your source tree: > make CROSS_TOOLCHAIN=amd64-gcc -j8 buildkernel > or > make CROSS_TOOLCHAIN=powerpc64-gcc -j8 buildkernel > or > make CROSS_TOOLCHAIN=sparc64-gcc -j8 buildkernel > > To build world: > same operation with buildworld. Please note that for world you will need to add > define NO_WERROR (world will also require a change in share/mk/bsd.lib.mk: > s/--fatal-warnings/--no-fatal-warnings/) > > also notes that for the kernel a lots of warnings are disabled in > share/sys/kern.mk so do not hesitate to remove yourself those -Wno-error= and > fix the issue they are hidding! Cool. Please coordinate with me before removing the -Wno-error because they vary by architecture. Warnerhelp
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