[gobject-introspection] giscanner: add a --use-ldd-wrapper option

[Christoph Reiter <creiter src gnome org>]

commit c363b8b2a44f216d2481377cfd6c66655270ba73
Author: Alexander Kanavin <alex kanavin gmail com>
Date:   Fri Oct 30 16:28:46 2015 +0200

    giscanner: add a --use-ldd-wrapper option
    
    This is useful in cross-compile environments where system's ldd
    command does not work on binaries built for a different architecture
    
    Signed-off-by: Alexander Kanavin <alex kanavin gmail com>

 giscanner/scannermain.py | 3 +++
 giscanner/shlibs.py      | 4 +++-
 2 files changed, 6 insertions(+), 1 deletion(-)
---
diff --git a/giscanner/scannermain.py b/giscanner/scannermain.py
index e6c7b47e..4aeb4172 100644
--- a/giscanner/scannermain.py
+++ b/giscanner/scannermain.py
@@ -123,6 +123,9 @@ def _get_option_parser():
     parser.add_option("", "--use-binary-wrapper",
                       action="store", dest="wrapper", default=None,
                       help="wrapper to use for running programs (useful when cross-compiling)")
+    parser.add_option("", "--use-ldd-wrapper",
+                      action="store", dest="ldd_wrapper", default=None,
+                      help="wrapper to use instead of ldd (useful when cross-compiling)")
     parser.add_option("", "--program-arg",
                       action="append", dest="program_args", default=[],
                       help="extra arguments to program")
diff --git a/giscanner/shlibs.py b/giscanner/shlibs.py
index b7c34dc8..9f8ab5df 100644
--- a/giscanner/shlibs.py
+++ b/giscanner/shlibs.py
@@ -97,7 +97,9 @@ def _resolve_non_libtool(options, binary, libraries):
             args.extend(libtool)
             args.append('--mode=execute')
         platform_system = platform.system()
-        if platform_system == 'Darwin':
+        if options.ldd_wrapper:
+            args.extend([options.ldd_wrapper, binary.args[0]])
+        elif platform_system == 'Darwin':
             args.extend(['otool', '-L', binary.args[0]])
         else:
             args.extend(['ldd', binary.args[0]])