Use binary mode when pre-parsing translation unit

Failed that, the module export position we obtain cannot be reliably seeked
to.

1 files changed, 3 insertions, 2 deletions

diff --git a/build2/cc/compile.cxx b/build2/cc/compile.cxx
index 681cfc9..76be8e6 100644
--- a/build2/cc/compile.cxx
+++ b/build2/cc/compile.cxx
@@ -2431,8 +2431,9 @@ namespace build2
                           env.empty () ? nullptr : env.data ());
           }
 
-          ifdstream is (move (pr.in_ofd),
-                        fdstream_mode::text | fdstream_mode::skip);
+          // Use binary mode to obtain consistent positions.
+          //
+          ifdstream is (move (pr.in_ofd), fdstream_mode::skip);
 
           parser p;
           translation_unit tu (p.parse (is, rels));