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      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"
     60