Re: [Xen-devel] Build problems with xen 4.7

[M A Young <m.a.young@xxxxxxxxxxxx>]

On Mon, 8 Aug 2016, Peng Fan wrote:

> ...
> <command-line>:0:0: error: "__OBJECT_FILE__" redefined [-Werror]
> <command-line>:0:0: note: this is the location of the previous definition
> cc1: all warnings being treated as errors
>
> ...
>
> Does this patch work when cross compile for ARM64?

I dropped that patch following suggestions on this thread, and just did it 
in the spec file, where the relevant bit is

export EXTRA_CFLAGS_XEN_TOOLS="$RPM_OPT_FLAGS"
export EXTRA_CFLAGS_QEMU_TRADITIONAL="$RPM_OPT_FLAGS"
export EXTRA_CFLAGS_QEMU_XEN="$RPM_OPT_FLAGS"
%if %build_crosshyp
XEN_TARGET_ARCH=x86_64 make %{?_smp_mflags} %{?efi_flags} prefix=/usr xen 
CC="/usr/bin/x86_64-linux-gnu-gcc `echo $RPM_OPT_FLAGS | sed -e 's/-m32//g' -e 
's/-march=i686//g' -e 's/-mtune=atom//g'`"
%else
make %{?_smp_mflags} %{?efi_flags} prefix=/usr xen CC="gcc $RPM_OPT_FLAGS"
%endif
./configure --prefix=%{_prefix} --libdir=%{_libdir} 
--with-system-seabios=%{seabiosloc} 
--with-system-qemu=/usr/bin/qemu-system-i386 
--with-linux-backend-modules="xen-evtchn xen-gntdev xen-gntalloc xen-blkback 
xen-netback xen-pciback xen-scsiback xen-acpi-processor"
make %{?_smp_mflags} %{?ocaml_flags} prefix=/usr tools
make                 prefix=/usr docs
export RPM_OPT_FLAGS_RED=`echo $RPM_OPT_FLAGS | sed -e 's/-m64//g' -e 
's/--param=ssp-buffer-size=4//g' -e's/-fstack-protector-strong//'`
%ifarch %{ix86}
export EXTRA_CFLAGS_XEN_TOOLS="$RPM_OPT_FLAGS_RED"
%endif
make mini-os-dir
make -C stubdom build
%ifarch x86_64
export EXTRA_CFLAGS_XEN_TOOLS="$RPM_OPT_FLAGS_RED"
XEN_TARGET_ARCH=x86_32 make -C stubdom pv-grub
%endif

which is a bit messy but seems to work. In summary you need not to set 
CFLAGS or unset it, and can instead pass extra compile options using
EXTRA_CFLAGS_XEN_TOOLS, EXTRA_CFLAGS_QEMU_TRADITIONAL and 
EXTRA_CFLAGS_QEMU_XEN and with CC="gcc compile_options" added to the make 
command for the hypervisor.

        Michael Young

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