make dirname work with C++

[Werner LEMBERG]

Here's a necessary patch for making `dirname' work with C++.


    Werner


======================================================================


diff --git a/ChangeLog b/ChangeLog
index 58a6511..9ac551d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2014-09-21  Werner Lemberg  <w...@gnu.org>
+
+       dirname: support compilation with C++
+       * lib/dirname.h: Add necessary C linkage declarations.
+
 2014-09-16  Paul Eggert  <egg...@cs.ucla.edu>
 
        qsort_r: include <config.h>
diff --git a/lib/dirname.h b/lib/dirname.h
index a1b7009..657d265 100644
--- a/lib/dirname.h
+++ b/lib/dirname.h
@@ -31,6 +31,10 @@
 #  define DOUBLE_SLASH_IS_DISTINCT_ROOT 0
 # endif
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 # if GNULIB_DIRNAME
 char *base_name (char const *file);
 char *dir_name (char const *file);
@@ -43,4 +47,8 @@ char *last_component (char const *file) _GL_ATTRIBUTE_PURE;
 
 bool strip_trailing_slashes (char *file);
 
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
 #endif /* not DIRNAME_H_ */