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 #!/bin/bash

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.

 # Use of this source code is governed by a BSD-style license that can be

 # found in the LICENSE file.

 # This program wraps around pkg-config to generate the correct include and

 # library paths when cross-compiling using a sysroot.

 # The assumption is that the sysroot contains the .pc files in usr/lib/pkgconfig

 # and usr/share/pkgconfig (relative to the sysroot) and that they output paths

 # relative to some parent path of the sysroot.

 # This assumption is valid for a range of sysroots, in particular: a

 # LSB-compliant root filesystem mounted at the sysroot, and a board build

 # directory of a Chromium OS chroot.

 root="$1"

 shift

 target_arch="$1"

 shift

 if [ -z "$root" -o -z "$target_arch" ]

 then

   echo "usage: $0 /path/to/sysroot target_arch [pkg-config-arguments] package" >&2

   exit 1

 fi

 if [ "$target_arch" = "x64" ]

 then

   libpath="lib64"

 else

   libpath="lib"

 fi

 rewrite=`dirname $0`/rewrite_dirs.py

 package=${!#}

 config_path=$root/usr/$libpath/pkgconfig:$root/usr/share/pkgconfig

 set -e

 # Some sysroots, like the Chromium OS ones, may generate paths that are not

 # relative to the sysroot. For example,

 # /path/to/chroot/build/x86-generic/usr/lib/pkgconfig/pkg.pc may have all paths

 # relative to /path/to/chroot (i.e. prefix=/build/x86-generic/usr) instead of

 # relative to /path/to/chroot/build/x86-generic (i.e prefix=/usr).

 # To support this correctly, it's necessary to extract the prefix to strip from

 # pkg-config's |prefix| variable.

 prefix=`PKG_CONFIG_PATH=$config_path pkg-config --variable=prefix "$package" | sed -e 's|/usr$||'`

 result=`PKG_CONFIG_PATH=$config_path pkg-config "$@"`

 echo "$result"| $rewrite --sysroot "$root" --strip-prefix "$prefix"