Hi,

in addition to the sorting problem found by Reiner dash is also not
reproducible since it indirectly captures the shell used as /bin/sh.

The problem is that that dash sets argv[0] to the relative path if
'exec' is called with a relative path and bash sets argv[0] to the
absolute path. When executing 'exec configure' in debian/rules argv[0]
gets captured by the configure script as $srcdir which is later used in
$DEFAULT_INCLUDES and passed to gcc. This leads to different build-ids
depending on the choice of /bin/sh.

The attached patch fix this by simply avoiding the exec call.

Thanks, HW42
diff -urN a/debian/rules b/debian/rules
--- a/debian/rules	2016-06-13 01:27:12.000000000 +0200
+++ b/debian/rules	2016-06-13 01:20:28.447939088 +0200
@@ -46,7 +46,7 @@
 	touch configure
 	(cd build-tmp && CC='$(CC)' \
 	  CFLAGS='$(CFLAGS)' CPPFLAGS='$(CPPFLAGS)' LDFLAGS='$(LDFLAGS)' \
-	  exec ../configure --enable-fnmatch --disable-lineno \
+	  ../configure --enable-fnmatch --disable-lineno \
 	    --host='$(DEB_HOST_GNU_TYPE)')
 	touch configure-stamp
 

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