From mboxrd@z Thu Jan 1 00:00:00 1970 From: Waldemar Brodkorb Date: Sun, 5 Jun 2016 09:00:31 +0200 Subject: [Buildroot] [PATCH v3 5/6] package/flannel: Add BR2_TOOLCHAIN_HAS_THREADS In-Reply-To: <20160531225642.3af186b6@free-electrons.com> References: <627469f0b7b4e604da3a5ab3ef721f138a1c95a8.1464286518.git.geoff@infradead.org> <20160528154158.70f4f025@free-electrons.com> <1464727672.12343.16.camel@infradead.org> <20160531225642.3af186b6@free-electrons.com> Message-ID: <20160605070031.GF6825@waldemar-brodkorb.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net Hi, Thomas Petazzoni wrote, > Hello, > > On Tue, 31 May 2016 13:47:52 -0700, Geoff Levand wrote: > > > Looking at the go sources, they force -pie when compiling cgo support > > for ARM. See line number 3188 in https://golang.org/src/cmd/go/build.go. > > Can you get more details than the "get accurate imported sym" the code > has? > > > I think the only solution is to not build go packages that use cgo > > when BR2_arm && BR2_TOOLCHAIN_USES_UCLIBC, so something like this: > > > > +# cgo on ARM requires PIE linkage, which is not compatable with uClibc. > > +comment "flannel is not available with uClibc-based toolchain on ARM architecture" > > + depends on BR2_PACKAGE_HOST_GO_ARCH_SUPPORTS > > + depends on BR2_TOOLCHAIN_HAS_THREADS > > + depends on BR2_arm && BR2_TOOLCHAIN_USES_UCLIBC > > + > > config BR2_PACKAGE_FLANNEL > > bool "flannel" > > depends on BR2_PACKAGE_HOST_GO_ARCH_SUPPORTS > > depends on BR2_TOOLCHAIN_HAS_THREADS > > + depends on !(BR2_arm && BR2_TOOLCHAIN_USES_UCLIBC) > > help > > > > If this looks OK, I'll submit a patch. > > This is really annoying, as all Go packages that need cgo support will > not work in what is probably Buildroot's most widely used > configuration: ARM with uClibc. > > So I'd really like to push things a bit further, and either fix uClibc > so that static+PIE works, or understand why Go wants PIE on ARM. A first step would be to integrate Scrt1.o into the external toolchain packages. It is build when uClibc-ng SHARED is enabled together with crt1.o. best regards Waldemar