rewrite pkg-config wrapper as python script

set config path and improve logging

build.py

@@ -87,7 +87,6 @@ class Target(BaseTarget):
         self.environment['PATH'] = self.environment['PATH'] \
             + os.pathsep + '/Applications/CMake.app/Contents/bin' \
             + os.pathsep + builder.bin_path
-        self.environment['PKG_CONFIG_PATH'] = builder.lib_path + 'pkgconfig'
 
         for prefix in ('CPP', 'C', 'CXX', 'OBJC', 'OBJCXX'):
             varname = f'{prefix}FLAGS'

deps/pkg-config/bin/pkg-config

@@ -1,3 +1,60 @@
-#!/bin/sh
-echo "% pkg-config $*" >> pkg-config.log
-"`dirname \"$0\"`/pkg-config.exe" --define-prefix $*
+#!/usr/bin/env python3
+
+#
+#    Helper module to build macOS version of various source ports
+#    Copyright (C) 2020 Alexey Lysiuk
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+import os
+import shlex
+import subprocess
+import sys
+
+
+def _main():
+    args = sys.argv[1:]
+
+    with open('pkg-config.log', 'a') as log:
+        cmdline = ' '.join(map(shlex.quote, args))
+        log.write(f'% pkg-config {cmdline}\n')
+
+    bin_path = os.path.dirname(os.path.abspath(__file__)) + os.sep
+    prefix_path = os.path.abspath(bin_path + os.pardir) + os.sep
+    config_path = prefix_path + 'lib/pkgconfig'
+
+    environment = os.environ
+    environment['PKG_CONFIG_PATH'] = config_path
+
+    args = [bin_path + 'pkg-config.exe', '--define-prefix'] + args
+    result = subprocess.run(args, env=environment, capture_output=True)
+
+    stdout = result.stdout.decode('ascii')
+    stderr = result.stderr.decode('ascii')
+
+    with open('pkg-config.log', 'a') as log:
+        log.write('out> ')
+        log.write(stdout if stdout else '\n')
+        log.write('err> ')
+        log.write(stderr if stderr else '\n')
+
+    sys.stdout.write(stdout)
+    sys.stderr.write(stderr)
+
+    sys.exit(result.returncode)
+
+
+if __name__ == '__main__':
+    _main()