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-rw-r--r--malloc/obstack.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/malloc/obstack.c b/malloc/obstack.c
index 47a4b16b53..4b3ccda906 100644
--- a/malloc/obstack.c
+++ b/malloc/obstack.c
@@ -95,10 +95,12 @@ int obstack_exit_failure = EXIT_FAILURE;
# define obstack_exit_failure exit_failure
# endif
-/* The non-GNU-C macros copy the obstack into this global variable
- to avoid multiple evaluation. */
-
+# ifdef _LIBC
+/* A looong time ago (before 1994, anyway; we're not sure) this global variable
+ was used by non-GNU-C macros to avoid multiple evaluation. The GNU C
+ library still exports it because somebody might use it. */
struct obstack *_obstack;
+# endif
/* Define a macro that either calls functions with the traditional malloc/free
calling interface, or calls functions with the mmalloc/mfree interface