[Buildroot] [PATCH] toolchain-external: fix gdbserver copying for ARC GNU tools

[Alexey Brodkin]

Hi Yann,

On Tue, 2015-03-17 at 00:01 +0100, Yann E. MORIN wrote:
> Alexey, All,
> 
> On 2015-03-17 00:02 +0300, Alexey Brodkin spake thusly:
> > Historically in pre-built ARC GNU tools gdbserver is located in
> > top-level "target-bin" folder.
> > 
> > Because of that fact if BR2_TOOLCHAIN_EXTERNAL_GDB_SERVER_COPY is
> > selected Buildroot won't find gdbserver (it looks within
> > SYSROOT/ARCH_SYSROOT folder).
> > 
> > Simplest solution is to use TOOLCHAIN_EXTERNAL_FIXUP_CMDS where copy
> > everything from "target-bin" foler into SYSROOT/usr/bin.
> > 
> > Reason to copy everything from "target-bin" is to enable possibility in
> > the future to copy more pre-built target binaries onto target.
> > 
> > Signed-off-by: Alexey Brodkin <abrodkin at synopsys.com>
> > Cc: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
> > Cc: Yann E. MORIN <yann.morin.1998 at free.fr>
> 
> Reviewed-by: "Yann E. MORIN" <yann.morin.1998 at free.fr>
> 
> However, a small suggestion (more of a question, in fact) below...
> 
> > ---
> >  toolchain/toolchain-external/toolchain-external.mk | 5 +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git a/toolchain/toolchain-external/toolchain-external.mk b/toolchain/toolchain-external/toolchain-external.mk
> > index c0429bb..d55b6de 100644
> > --- a/toolchain/toolchain-external/toolchain-external.mk
> > +++ b/toolchain/toolchain-external/toolchain-external.mk
> > @@ -396,6 +396,11 @@ else
> >  TOOLCHAIN_EXTERNAL_SYNOPSYS_ENDIANESS = be
> >  endif
> >  TOOLCHAIN_EXTERNAL_SOURCE = arc_gnu_2014.12_prebuilt_uclibc_$(TOOLCHAIN_EXTERNAL_SYNOPSYS_ENDIANESS)_$(TOOLCHAIN_EXTERNAL_SYNOPSYS_CORE)_linux_install.tar.gz
> > +define TOOLCHAIN_EXTERNAL_FIXUP_CMDS
> > +	$(Q)SYSROOT_DIR="$(call toolchain_find_sysroot,$(TOOLCHAIN_EXTERNAL_CC))" ; \
> > +	mkdir -p $${SYSROOT_DIR}/usr/bin ; \
> > +	cp $(TOOLCHAIN_EXTERNAL_INSTALL_DIR)/target-bin/* $${SYSROOT_DIR}/usr/bin
> 
> Waht about using 'cp -l' instead? That would create hardlinks instead of
> actual copies.
> 
> I guess we do not really support building on a filesystem that does not
> support hard links, do we?
> 
> Still, this should not be a blocker for inclusion.

Even though we may indeed create both hard- or synmlink, what do you
think about use of "install" command?

Something like that:
--->8---
install -m 0755 -D
$(TOOLCHAIN_EXTERNAL_INSTALL_DIR)/target-bin/gdbserver
$${SYSROOT_DIR}/usr/bin/gdbserver
--->8---

Compared to "cp" install with "-D" may create leading path itself, so we
won't need additional "mkdir -p".

-Alexey