[arch-projects] [devtools] [PATCH] add ccache support

[Dave Reisner]

On Fri, Aug 09, 2013 at 09:38:27AM +0200, Dominik Heidler wrote:
> Users can set a ccache directory (which must be writeable by
> the user nobody) to be mapped to /build/.ccache (which is the
> directory, that ccache will use in the chroot)
> 
> Signed-off-by: Dominik Heidler <dheidler at gmail.com>
> ---

Looks fine, but I still have trouble grok'ing the usefulness of this. If
you "import" the ccache directory, there's no telling what's in it --
there might be object files compiled using CFLAGS incompatible with the
final output (resulting in a package that won't necessarily work as you
expect). For example, my local builds (not using devtools) add
-march=native and (sometimes) -flto. Building with devtools, there's no
way these should be added.

Is ccache smart enough to recompile the .o files in this case?

>  makechrootpkg.in | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/makechrootpkg.in b/makechrootpkg.in
> index 1cd08fb..7cf0031 100644
> --- a/makechrootpkg.in
> +++ b/makechrootpkg.in
> @@ -21,6 +21,7 @@ run_namcap=false
>  temp_chroot=false
>  chrootdir=
>  passeddir=
> +ccachedir=
>  declare -a install_pkgs
>  declare -i ret=0
>  
> @@ -58,10 +59,11 @@ usage() {
>  	echo "           Default: $copy"
>  	echo '-n         Run namcap on the package'
>  	echo '-T         Build in a temporary directory'
> +	echo '-C <dir>   The ccache directory to use'
>  	exit 1
>  }
>  
> -while getopts 'hcur:I:l:nT' arg; do
> +while getopts 'hcur:I:l:C:nT' arg; do
>  	case "$arg" in
>  		h) usage ;;
>  		c) clean_first=true ;;
> @@ -71,6 +73,7 @@ while getopts 'hcur:I:l:nT' arg; do
>  		l) copy="$OPTARG" ;;
>  		n) run_namcap=true; makepkg_args="$makepkg_args -i" ;;
>  		T) temp_chroot=true; copy+="-$$" ;;
> +		C) ccachedir="$OPTARG" ;;
>  		*) makepkg_args="$makepkg_args -$arg $OPTARG" ;;
>  	esac
>  done
> @@ -84,6 +87,8 @@ chrootdir=$(readlink -e "$passeddir")
>  [[ ! -d $chrootdir ]] && die "No chroot dir defined, or invalid path '%s'" "$passeddir"
>  [[ ! -d $chrootdir/root ]] && die "Missing chroot dir root directory. Try using: mkarchroot %s/root base-devel" "$chrootdir"
>  
> +[[ -n $ccachedir && ! -d $ccachedir ]] && die "Invalid path '%s' given for ccache directory" "$ccachedir"
> +
>  # Detect chrootdir filesystem type
>  chroottype=$(stat -f -c %T "$chrootdir")
>  
> @@ -349,6 +354,7 @@ download_sources
>  if arch-nspawn "$copydir" \
>  	--bind-ro="$PWD:/startdir_host" \
>  	--bind-ro="$SRCDEST:/srcdest_host" \
> +	${ccachedir:+"--bind=$ccachedir:/build/.ccache"} \
>  	/chrootbuild
>  then
>  	move_products
> -- 
> 1.8.3.4
>