[Buildroot] Adding package libgit2

[Yann E. MORIN <yann.morin.1998@free.fr>]

Nicolas, Thomas, All,

On 2018-02-14 16:36 +0100, Thomas Petazzoni spake thusly:
> On Wed, 14 Feb 2018 16:30:24 +0100, Nicolas Cavallari wrote:
> > > ARCH is set to ${CMAKE_SYSTEM_PROCESSOR}, and CMAKE_SYSTEM_PROCESSOR is
> > > explicitly passed by Buildroot in package/pkg-cmake.mk. So it should be
> > > correct. zlib-ng CMakeLists.txt uses its ${ARCH} variable to decide
> > > whether the x86 code should be built or not:
> > > 
> > > if("${ARCH}" MATCHES "x86_64" OR "${ARCH}" MATCHES "AMD64")
> > >     set(ARCHDIR "arch/x86")
> > >     add_definitions(-DX86_64 -DX86_NOCHECK_SSE2 -DUNALIGNED_OK -DUNROLL_LESS)
> > >     add_feature_info(SSE2 1 "Use the SSE2 instruction set, using \"${SSE2FLAG}\"")  
> > 
> > I have added --trace to cmake.  There is this gem a few lines below:
> > 
> > else()
> >     set(ARCHDIR "arch/x86")
> >     add_definitions(-DX86 -DUNALIGNED_OK -DUNROLL_LESS)
> >     add_feature_info(SSE2 1 "Support the SSE2 instruction set, using
> > \"${SSE2FLAG}\"")
> > endif()
> > 
> > So anything not arm/aarch64/x86 is treated like x86 anyway...
> 
> Which obviously is not going to work very well :)
> 
> I guess this should be fixed and/or reported to zlib-ng upstream. In
> the mean time, either we fix it, or we disallow zlib-ng on
> architectures other than arm/aarch64/x86.

Yes, let's limit zlib-ng to the only arch upstream supports.

I'll send a patch...

Regards,
Yann E. MORIN.

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