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-rw-r--r--sys/sys/cdefs.h7
1 files changed, 6 insertions, 1 deletions
diff --git a/sys/sys/cdefs.h b/sys/sys/cdefs.h
index efb0b75a0b7e..bab01e53f2de 100644
--- a/sys/sys/cdefs.h
+++ b/sys/sys/cdefs.h
@@ -373,11 +373,16 @@
* _POSIX_C_SOURCE, we will assume that it wants the broader compilation
* environment (and in fact we will never get here).
*/
-#ifdef _ANSI_SOURCE /* Hide almost everything. */
+#if defined(_ANSI_SOURCE) /* Hide almost everything. */
#define __POSIX_VISIBLE 0
#define __XSI_VISIBLE 0
#define __BSD_VISIBLE 0
#define __ISO_C_VISIBLE 1990
+#elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */
+#define __POSIX_VISIBLE 0
+#define __XSI_VISIBLE 0
+#define __BSD_VISIBLE 0
+#define __ISO_C_VISIBLE 1999
#else /* Default environment: show everything. */
#define __POSIX_VISIBLE 200112
#define __XSI_VISIBLE 600