[PATCH] [v5] Add cross compile top level configure script

[PATCH] [v5] Add cross compile top level configure script

[Jerone Young]

This patch takes feedback from Anthony Liguouri.
- remove --cc option added in v4 of patch (keep old behavior)
- do not specify cc= everytime on the qemu configuration line, this
allows qemu to autodetect gcc 3.x

This simplifies the patch more. While preserving behavior.

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 +3,32 @@ 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)
+qemu_cc=
+qemu_cflags=
+qemu_ldflags=
 disable_gcc_check=
+cross_prefix=
+arch=`uname -m`
+target_exec=
 
 usage() {
     cat <<-EOF
 	Usage: $0 [options]
 
 	Options include:
-
+	    --arch=ARCH            architecture to compile for ($arch)
+	    --cross-prefix=PREFIX  prefix for cross compile
 	    --prefix=PREFIX        where to install things ($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           specify compiler for qemu (must be gcc-3.x)
+	    --qemu-cflags=CFLAGS   CFLAGS to add to qemu configuration
+	    --qemu-ldflags=LDFLAGS LDFLAGS to add to qemu configuration
 	    --disable-gcc-check    don't insist on gcc-3.x
-                                   - this will break running without kvm
+	                           CAUTION: this will break running without kvm
 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
@@ -50,9 +50,21 @@ while [[ "$1" = -* ]]; do
 	--qemu-cc)
 	    qemu_cc="$arg"
 	    ;;
+	--qemu-cflags)
+	    qemu_cflags="$arg"
+	    ;;
+	--qemu-ldflags)
+	    qemu_ldflags="$arg"
+	    ;;
 	--disable-gcc-check)
 	    disable_gcc_check=1
 	    ;;
+	--arch)
+	    arch="$arg"
+	    ;;
+	--cross-prefix)
+	    cross_prefix="$arg"
+            ;;
 	--help)
 	    usage
 	    ;;
@@ -62,39 +74,47 @@ 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
-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" \
-    --disable-kqemu --extra-cflags="-I $PWD/../user" \
-    --extra-ldflags="-L $PWD/../user" \
+#set parameters compiling
+qemu_opts=
+if [ "$arch" = "i386" -o "$arch" = "x86_64" ]; then
+    target_exec="x86_64-softmmu"
+    qemu_opts+=" --enable-alsa"
+fi
+
+#configure user dir
+(cd user; ./configure --prefix="$prefix" --kerneldir="$libkvm_kerneldir" \
+          --arch="$arch" \
+          ${cross_prefix:+"--cross-prefix=$cross_prefix"})
+
+#configure qemu
+(cd qemu; ./configure --target-list=$target_exec \
+    --disable-kqemu --extra-cflags="-I $PWD/../user $qemu_cflags" \
+    --extra-ldflags="-L $PWD/../user $qemu_ldflags" \
     --enable-kvm --kernel-path="$libkvm_kerneldir" \
-    --enable-alsa \
     ${disable_gcc_check:+"--disable-gcc-check"} \
-    --prefix="$prefix"
+    --prefix="$prefix" \
+    ${qemu_cc:+"--cc=$qemu_cc"} \
+    ${cross_prefix:+"--cross-prefix=$cross_prefix --cpu=$arch"} \
+    $qemu_opts
 )
 
 
-
 cat <<EOF > config.mak
+ARCH=$arch
 PREFIX=$prefix
 KERNELDIR=$kerneldir
 WANT_MODULE=$want_module
+CROSS_COMPILE=$cross_prefix
 EOF
-



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Re: [PATCH] [v5] Add cross compile top level configure script

[Anthony Liguori]

Jerone Young wrote:
> This patch takes feedback from Anthony Liguouri.
> - remove --cc option added in v4 of patch (keep old behavior)
> - do not specify cc= everytime on the qemu configuration line, this
> allows qemu to autodetect gcc 3.x
>
> This simplifies the patch more. While preserving behavior.
>   

This one looks a lot better to me.

Thanks,

Anthony Liguori

> 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 +3,32 @@ 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)
> +qemu_cc=
> +qemu_cflags=
> +qemu_ldflags=
>  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 compile
>  	    --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           specify compiler for qemu (must be gcc-3.x)
> +	    --qemu-cflags=CFLAGS   CFLAGS to add to qemu configuration
> +	    --qemu-ldflags=LDFLAGS LDFLAGS to add to qemu configuration
>  	    --disable-gcc-check    don't insist on gcc-3.x
> -                                   - this will break running without kvm
> +	                           CAUTION: this will break running without kvm
>  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
> @@ -50,9 +50,21 @@ while [[ "$1" = -* ]]; do
>  	--qemu-cc)
>  	    qemu_cc="$arg"
>  	    ;;
> +	--qemu-cflags)
> +	    qemu_cflags="$arg"
> +	    ;;
> +	--qemu-ldflags)
> +	    qemu_ldflags="$arg"
> +	    ;;
>  	--disable-gcc-check)
>  	    disable_gcc_check=1
>  	    ;;
> +	--arch)
> +	    arch="$arg"
> +	    ;;
> +	--cross-prefix)
> +	    cross_prefix="$arg"
> +            ;;
>  	--help)
>  	    usage
>  	    ;;
> @@ -62,39 +74,47 @@ while [[ "$1" = -* ]]; do
>      esac
>  done
>  
> -if [[ -z "$qemu_cc" ]]; then
> -    echo "$0: cannot locate gcc 3.x. please install it or specify with --qemu-cc"
> -    exit 1
> -fi
>  
> +#set kenel directory
>  libkvm_kerneldir="$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" \
> -    --disable-kqemu --extra-cflags="-I $PWD/../user" \
> -    --extra-ldflags="-L $PWD/../user" \
> +#set parameters compiling
> +qemu_opts=
> +if [ "$arch" = "i386" -o "$arch" = "x86_64" ]; then
> +    target_exec="x86_64-softmmu"
> +    qemu_opts+=" --enable-alsa"
> +fi
> +
> +#configure user dir
> +(cd user; ./configure --prefix="$prefix" --kerneldir="$libkvm_kerneldir" \
> +          --arch="$arch" \
> +          ${cross_prefix:+"--cross-prefix=$cross_prefix"})
> +
> +#configure qemu
> +(cd qemu; ./configure --target-list=$target_exec \
> +    --disable-kqemu --extra-cflags="-I $PWD/../user $qemu_cflags" \
> +    --extra-ldflags="-L $PWD/../user $qemu_ldflags" \
>      --enable-kvm --kernel-path="$libkvm_kerneldir" \
> -    --enable-alsa \
>      ${disable_gcc_check:+"--disable-gcc-check"} \
> -    --prefix="$prefix"
> +    --prefix="$prefix" \
> +    ${qemu_cc:+"--cc=$qemu_cc"} \
> +    ${cross_prefix:+"--cross-prefix=$cross_prefix --cpu=$arch"} \
> +    $qemu_opts
>  )
>  
>  
> -
>  cat <<EOF > config.mak
> +ARCH=$arch
>  PREFIX=$prefix
>  KERNELDIR=$kerneldir
>  WANT_MODULE=$want_module
> +CROSS_COMPILE=$cross_prefix
>  EOF
> -
>
>
>
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>   


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Re: [PATCH] [v5] Add cross compile top level configure script

[Avi Kivity]

Jerone Young wrote:
> This patch takes feedback from Anthony Liguouri.
> - remove --cc option added in v4 of patch (keep old behavior)
> - do not specify cc= everytime on the qemu configuration line, this
> allows qemu to autodetect gcc 3.x
>
> This simplifies the patch more. While preserving behavior.
>   

Applied, thanks.

[I applied a previous patch but failed to push it, so I had to revert
it.  Hope that's the right thing]

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.


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