Date: Thu, 13 Nov 2014 23:44:42 +0100 From: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com> To: Bryan Hundven <bryanhundven@...il.com> Cc: musl@...ts.openwall.com Subject: Re: musl-cross toolchains now unusable in Buildroot Dear Bryan Hundven, On Sun, 9 Nov 2014 12:05:23 -0800, Bryan Hundven wrote: > > * The toolchains have the sysroot mechanism disabled. For an unknown > > reason, in commit > > https://bitbucket.org/GregorR/musl-cross/commits/f9c0c3c34f0fe122541a129f1aa87686954d5f1b, > > the sysroot feature was disabled. This is weird, as essentially all > > modern toolchains have the sysroot feature enabled. This is > > essential for Buildroot to use a pre-built toolchain. > > musl-cross uses a config.sh to configure the toolchain settings: > https://bitbucket.org/GregorR/musl-cross/src/tip/config.sh?at=default > > That is where you would set: > ``` > WITH_SYSROOT=yes > ``` > > So, musl-cross does still have sysroot, it just doesn't have it on by default. > Sysroot support does have a problem with the path, which is described > with this bug and patch: > https://bitbucket.org/GregorR/musl-cross/issue/2/sysroot-configuration-bug This is of zero interest for Buildroot. In Buildroot, we have two mechanisms for toolchains: * What we call the "internal toolchain backend", where Buildroot builds its own toolchain. This already has the capability of building musl toolchains, and is completely independent from musl-cross (except from the fact that we borrowed the gcc patches). However, this "backend" forces the user to wait a fairly long time for the toolchain to build. * What we call the "external toolchain backend", where Buildroot simply downloads and uses an already existing pre-built toolchain. This is where the toolchains produced by musl-cross and available at https://e82b27f594c813a5a4ea5b07b06f16c3777c3b8c.googledrive.com/host/0BwnS5DMB0YQ6bDhPZkpOYVFhbk0/ are nice, because Buildroot simply toolchains the tarball, extracts it and voila, we have a working Musl toolchain in a few seconds. So, the fact that musl-cross *allows* to build sysroot-enabled toolchain is of no use to us, if the toolchain proposed by musl-cross at https://e82b27f594c813a5a4ea5b07b06f16c3777c3b8c.googledrive.com/host/0BwnS5DMB0YQ6bDhPZkpOYVFhbk0/ don't have this option enabled. Best regards, Thomas -- Thomas Petazzoni, CTO, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com
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