Add optional description which complains on newer versions of autoconf

Summary: #22 Test Plan: none Reviewed By: andrewjcg@fb.com FB internal diff: D683791
facebook · Jan 19, 2013 · a6f8a89 · a6f8a89
1 parent 9a90a89
commit a6f8a89
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/folly/configure.ac b/folly/configure.ac
@@ -52,8 +52,8 @@ AC_TYPE_SIZE_T
 AC_HEADER_TIME
 AC_C_VOLATILE
 AC_CHECK_TYPE([__int128],
-  [AC_DEFINE([HAVE_INT128_T], [1])],
-  [AC_DEFINE([HAVE_INT128_T], [0])])
+  [AC_DEFINE([HAVE_INT128_T], [1], [Define if __int128 exists])],
+  [AC_DEFINE([HAVE_INT128_T], [0], [Define if __int128 does not exist])])
 AC_CHECK_TYPES([ptrdiff_t])
 
 # Checks for library functions.