build/linux/pkg-config-wrapper

   1 #!/bin/bash
   2 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
   3 # Use of this source code is governed by a BSD-style license that can be
   4 # found in the LICENSE file.
   5
   6 # This program wraps around pkg-config to generate the correct include and
   7 # library paths when cross-compiling using a sysroot.
   8 # The assumption is that the sysroot contains the .pc files in usr/lib/pkgconfig
   9 # and usr/share/pkgconfig (relative to the sysroot) and that they output paths
  10 # relative to some parent path of the sysroot.
  11 # This assumption is valid for a range of sysroots, in particular: a
  12 # LSB-compliant root filesystem mounted at the sysroot, and a board build
  13 # directory of a Chromium OS chroot.
  14 # Additional directories containing .pc files may be specified by setting
  15 # the PKG_CONFIG_PATH environment variable- these will be prepended to the
  16 # generated paths.
  17
  18 root="$1"
  19 shift
  20 target_arch="$1"
  21 shift
  22 libpath="$1"
  23 shift
  24
  25 if [ -z "$root" -o -z "$target_arch" ]
  26 then
  27   echo "usage: $0 /path/to/sysroot target_arch libdir [pkg-config-arguments] package" >&2
  28   exit 1
  29 fi
  30
  31 if [ "$target_arch" = "x64" ]
  32 then
  33   : ${libpath:="lib64"}
  34 else
  35   : ${libpath:="lib"}
  36 fi
  37
  38 rewrite=`dirname $0`/rewrite_dirs.py
  39 package=${!#}
  40
  41 config_path=$root/usr/$libpath/pkgconfig:$root/usr/share/pkgconfig
  42
  43 # prepend any paths specified by the environment
  44 if [ -n "$PKG_CONFIG_PATH" ]
  45 then
  46   config_path="$PKG_CONFIG_PATH:$config_path"
  47 fi
  48
  49 set -e
  50 # Some sysroots, like the Chromium OS ones, may generate paths that are not
  51 # relative to the sysroot. For example,
  52 # /path/to/chroot/build/x86-generic/usr/lib/pkgconfig/pkg.pc may have all paths
  53 # relative to /path/to/chroot (i.e. prefix=/build/x86-generic/usr) instead of
  54 # relative to /path/to/chroot/build/x86-generic (i.e prefix=/usr).
  55 # To support this correctly, it's necessary to extract the prefix to strip from
  56 # pkg-config's |prefix| variable.
  57 prefix=`PKG_CONFIG_PATH=$config_path pkg-config --variable=prefix "$package" | sed -e 's|/usr$||'`
  58 result=`PKG_CONFIG_PATH=$config_path pkg-config "$@"`
  59 echo "$result"| $rewrite --sysroot "$root" --strip-prefix "$prefix"