Re: [PATCH] Add cross compile to top level configuration file

Jerone Young
2007-10-15T20:35:49Z

On Mon, 2007-10-15 at 15:13 -0500, Anthony Liguori wrote:
> Jerone Young wrote:
> > This patch is an improved version of patches sent last week to enable
> > the top level configuration file for cross compile. This currently
> > allows x86 & x86-64 to cross compile. But will soon be sending patches
> > for powerpc embedded once this is accepted. This patches to latest git
> > and is in git format ;-)
> >
> > Signed-off-by: Jerone Young <jyoung5-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
> >
> > ------------------------------------------------------------------------
>
> > diff --git a/configure b/configure
> > --- a/configure
> > +++ b/configure
> > @@ -3,32 +3,30 @@ prefix=/usr/local
> > prefix=/usr/local
> > kerneldir=/lib/modules/$(uname -r)/build
> > want_module=1
> > -qemu_cc=$(ls /usr/bin/gcc3* /usr/bin/gcc-3* 2>/dev/null | tail -n1)
> > +cc=gcc
> > +qemu_cc=
> > disable_gcc_check=
> > +cross_prefix=
> > +arch=`uname -m`
> > +target_exec=
> >
> > usage() {
> > cat <<-EOF
> > Usage: $0 [options]
> >
> > Options include:
> > -
> > + --arch=ARCH architecture to compile for ($arch)
> > + --cross-prefix=PREFIX prefix for cross compiler
> > --prefix=PREFIX where to install things ($prefix)
> > --with-patched-kernel don't use external module
> > --kerneldir=DIR kernel build directory ($kerneldir)
> > - --qemu-cc="$qemu_cc" compiler for qemu (needs gcc3.x) ($qemu_cc)
> > + --qemu-cc=CC compiler for qemu (needs to be gcc 3.x)
> > + Not valid if used with --cross-prefix
> > --disable-gcc-check don't insist on gcc-3.x
> > - - this will break running without kvm
> > + CAUTION: using this option may break build
> > EOF
> > exit 1
> > }
> > -
> > -
> > -# prefer gcc if its version is 3.* ( over a compat-gcc )
> > -# do it before parsing command line arguments to enable the user
> > -# to specify a specific gcc he/she likes.
> > -if gcc -v 2>&1 | grep -q 'gcc *version *3\.[2-4]\.[0-9]'; then
> > - qemu_cc=gcc
> > -fi
> >
> > while [[ "$1" = -* ]]; do
> > opt="$1"; shift
> > @@ -53,6 +51,12 @@ while [[ "$1" = -* ]]; do
> > --disable-gcc-check)
> > disable_gcc_check=1
> > ;;
> > + --arch)
> > + arch="$arg"
> > + ;;
> > + --cross-prefix)
> > + cross_prefix="$arg"
> > + ;;
> > --help)
> > usage
> > ;;
> > @@ -62,39 +66,71 @@ while [[ "$1" = -* ]]; do
> > esac
> > done
> >
> > -if [[ -z "$qemu_cc" ]]; then
> > - echo "$0: cannot locate gcc 3.x. please install it or specify with --qemu-cc"
> > - exit 1
> > +
> > +# if cc is not specified on the command line
> > +# look for gcc version 3.x
> > +if [[ -z "$qemu_cc" ]] && [[ -z "$cross_prefix" ]]; then
> > + #check for a gcc 3.x version on the system
> > + cc_check=$(ls /usr/bin/gcc3* /usr/bin/gcc-3* 2>/dev/null | tail -n1)
> > + #prefer gcc if its version is 3.* ( over a compat-gcc )
> > + gcc_check=$(gcc -v 2>&1 | grep -q 'gcc *version *3\.[2-4]\.[0-9]')
> > + if [[ -n "$cc_check" ]] && [[ -z "$gcc_check" ]] ; then
> > + cc=$cc_check
> > + fi
> > fi
> >
> >
>
> The QEMU that's in git automatically finds the right GCC version so this
> whole check isn't necessary anymore.

This is true. Figured that this was still there for a particular reason.
If this is the case then this can be removed.

>
> Regards,
>
> Anthony Liguori
>
> > +#if qemu_cc is specfied on the command line, set cc=$qemu_cc
> > +if [[ -n "$qemu_cc" ]] && [[ -z "$cross_prefix" ]]; then
> > + cc=$qemu_cc
> > +fi
> > +
> > +#set kenel directory
> > libkvm_kerneldir="$kerneldir"
> > if (( want_module )); then
> > libkvm_kerneldir=$(readlink -f kernel)
> > fi
> >
> > -target_cpu() {
> > - if [[ $(uname -m) = i?86 ]]; then
> > - echo x86_64
> > - else
> > - uname -m
> > - fi
> > -}
> > +#if arch is an x86 arch set to i386
> > +if [[ $arch = i?86 ]]; then
> > + arch="i386"
> > +fi
> >
> > -(cd user; ./configure --prefix="$prefix" --kerneldir="$libkvm_kerneldir")
> > -(cd qemu; ./configure --target-list=$(target_cpu)-softmmu --cc="$qemu_cc" \
> > +#see if using a cross compiler or not
> > +qemu_opts=
> > +user_opts=
> > +if [[ -z $cross_prefix ]]; then
> > + qemu_opts+=" --cc=$cc"
> > + user_opts+=" --cc=$cc"
> > +else
> > + qemu_opts+=" --cross-prefix=$cross_prefix"
> > + user_opts+=" --cross-prefix=$cross_prefix"
> > +fi
> > +
> > +#set parameters compiling
> > +if [ "$arch" = "i386" -o "$arch" = "x86_64" ]; then
> > + target_exec="x86_64-softmmu"
> > + qemu_opts+=" --enable-alsa"
> >
>
> Why are you only passing --enable-alsa only x86?

Because for our powerpc stuff we actually want different options. ALSA
is not a dependency we want.

>
> > +fi
> > +
> > +qemudir=`pwd`/qemu
> > +
> > +#configure user dir
> > +(cd user; ./configure --prefix="$prefix" --kerneldir="$libkvm_kerneldir" \
> > + $user_opts --arch="$arch")
> > +(cd qemu; ./configure --target-list=$target_exec \
> > --disable-kqemu --extra-cflags="-I $PWD/../user" \
> > --extra-ldflags="-L $PWD/../user" \
> > --enable-kvm --kernel-path="$libkvm_kerneldir" \
> > - --enable-alsa \
> > ${disable_gcc_check:+"--disable-gcc-check"} \
> > - --prefix="$prefix"
> > + --prefix="$prefix" \
> > + $qemu_opts --cpu="$arch"
> >
>
> I don't think this is right. You're using two different --cpu options
> for i386 and x86_64. There really shouldn't be a --cpu option at all
> for x86.

So the --cpu option is actually a hidden option in qemu & is not on the
qemu help page .. who know why it isn't but the it's in the code.

It makes since though that if you are going to specify cross-prefix=
then there is little reason to specify the cpu on the qemu line. As it
should detect everything from cross compiler.

I'll test this out and send a new patch with the 2 changes.

>
> Regards,
>
> Anthony Liguori
>
> > )
> >
> >
> > -
> > cat <<EOF > config.mak
> > +ARCH=$arch
> > PREFIX=$prefix
> > KERNELDIR=$kerneldir
> > WANT_MODULE=$want_module
> > +CC=$cross_prefix$cc
> > EOF
> > -
>
>
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