OpenBSD: disable compiler-time param checking for string_sprintf() etc

[exim.git] / src / src / mytypes.h

diff --git a/src/src/mytypes.h b/src/src/mytypes.h
index a3496a2986634400a00f9f204f4ed643e62f3b7b..38ee93d8ca034276ea6eaa9f65562e737f11181b 100644 (file)
--- a/src/src/mytypes.h
+++ b/src/src/mytypes.h
@@ -3,6 +3,7 @@
 *************************************************/
 
 /* Copyright (c) University of Cambridge 1995 - 2018 */
+/* Copyright (c) The Exim Maintainers 2020 */
 /* See the file NOTICE for conditions of use and distribution. */
 
 
@@ -29,17 +30,20 @@ local_scan.h includes it and exim.h includes them both (to get this earlier). */
 
 
 /* If gcc is being used to compile Exim, we can use its facility for checking
-the arguments of printf-like functions. This is done by a macro. */
+the arguments of printf-like functions. This is done by a macro.
+OpenBSD has unfortunately taken to objecting to use of %n in printf
+so we have to give up on all of the available parameter checking. */
 
 #if defined(__GNUC__) || defined(__clang__)
-# define PRINTF_FUNCTION(A,B)  __attribute__((format(printf,A,B)))
+# ifndef __OpenBSD__
+#  define PRINTF_FUNCTION(A,B) __attribute__((format(printf,A,B)))
+# endif
 # define ARG_UNUSED            __attribute__((__unused__))
 # define WARN_UNUSED_RESULT    __attribute__((__warn_unused_result__))
 # define ALLOC                 __attribute__((malloc))
 # define ALLOC_SIZE(A)         __attribute__((alloc_size(A)))
 # define NORETURN              __attribute__((noreturn))
 #else
-# define PRINTF_FUNCTION(A,B)
 # define ARG_UNUSED            /**/
 # define WARN_UNUSED_RESULT    /**/
 # define ALLOC                 /**/
@@ -47,10 +51,14 @@ the arguments of printf-like functions. This is done by a macro. */
 # define NORETURN              /**/
 #endif
 
+#ifndef PRINTF_FUNCTION
+# define PRINTF_FUNCTION(A,B)  /**/
+#endif
+
 #ifdef WANT_DEEPER_PRINTF_CHECKS
 # define ALMOST_PRINTF(A, B) PRINTF_FUNCTION(A, B)
 #else
-# define ALMOST_PRINTF(A, B)
+# define ALMOST_PRINTF(A, B)   /**/
 #endif