Re: Fix aarch64 build on embree

[Peter Robinson]

On Wed, Jun 29, 2022 at 10:06 AM Petr Pisar <ppisar(a)redhat.com&gt; wrote:
>  V Tue, Jun 28, 2022 at 07:08:31PM -0700, Luya Tshimbalanga napsal(a):
>  > Hello team,
>  >
>  > What is the way to disable `-mss2 for aarch64 build in embree?
>  >
>  > Spec file:
>  > https://src.fedoraproject.org/rpms/embree/blob/rawhide/f/embree.spec
>  >
>  > Scratch build result:
>  > https://koji.fedoraproject.org/koji/taskinfo?taskID=88867571
>  >
>  Are you sure your scratch build corresponds to the linked spec file?
>
>  The spec file reads:
>
>      %ifarch x86_64
>              -DEMBREE_MAX_ISA=SSE4.2 \
>      %else
>              -DEMBREE_MAX_ISA=NONE \
>      %endif
>
>  but the build.log shows:
>
>      + /usr/bin/cmake -DCMAKE_C_FLAGS_RELEASE:STRING=-DNDEBUG
> -DCMAKE_CXX_FLAGS_RELEASE:STRING=-DNDEBUG -DCMAKE_Fortran_FLAGS_RELEASE:STRING=-DNDEBUG
> -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON -DCMAKE_INSTALL_DO_STRIP:BOOL=OFF
> -DCMAKE_INSTALL_PREFIX:PATH=/usr -DINCLUDE_INSTALL_DIR:PATH=/usr/include
> -DLIB_INSTALL_DIR:PATH=/usr/lib64 -DSYSCONF_INSTALL_DIR:PATH=/etc
> -DSHARE_INSTALL_PREFIX:PATH=/usr/share -DLIB_SUFFIX=64 -DBUILD_SHARED_LIBS:BOOL=ON
> -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_STANDARD=17 -DCMAKE_INSTALL_LIBDIR=/usr/lib64
> -DCMAKE_INSTALL_PREFIX=/usr -DEMBREE_COMPACT_POLYS=ON -DEMBREE_IGNORE_CMAKE_CXX_FLAGS=OFF
> -DEMBREE_ISPC_SUPPORT=ON -DEMBREE_MAX_ISA=DEFAULT -DEMBREE_TUTORIALS=OFF
>
>  There is -DEMBREE_MAX_ISA=DEFAULT instead of -DEMBREE_MAX_ISA=NONE.
>
>  Morover, I'm not sure whether upstream supports a generic AArch64. README.md
>  reads:
>
>      Embree requires at least an x86 CPU with support for
>      SSE2 or an Apple M1 CPU. 
The CMake file just specifies NEON so I suspect it's just generic but
has only been tested on M1 Mac