features.h; tls_validate_require_cipher: log flag & tests

[exim.git] / src / OS / os.h-Linux

diff --git a/src/OS/os.h-Linux b/src/OS/os.h-Linux
index 5b731eaa1144761d0c32274e9c5b6dd7c65c45e3..5186ec89dde44f645efa85bf55ae03954ed24b8a 100644 (file)
--- a/src/OS/os.h-Linux
+++ b/src/OS/os.h-Linux
@@ -1,16 +1,27 @@
-/* $Cambridge: exim/src/OS/os.h-Linux,v 1.4 2006/10/30 22:06:33 tom Exp $ */
-
 /* Exim: OS-specific C header file for Linux */
 
+/* Some weird variants may require invocation with C99 and features.h
+inclusion to build, with the 64-bit arithmetic. Make compiler selection
+their problem, but build anyway. */
+
+#include <features.h>
+
+
 #define CRYPT_H
 #define GLIBC_IP_OPTIONS
 #define HAVE_MMAP
 #define HAVE_BSD_GETLOADAVG
 #define HAVE_SYS_STATVFS_H
-#define HAVE_LINUX_SENDFILE
 #define NO_IP_VAR_H
 #define SIG_IGN_WORKS
 
+/* When using the DKIM, setting HAVE_LINUX_SENDFILE can increase
+performance on outgoing mail a bit. Note: With older glibc versions
+this setting will conflict with the _FILE_OFFSET_BITS=64 setting
+defined as part of the Linux CFLAGS. */
+
+/* #define HAVE_LINUX_SENDFILE */
+
 #define F_FREESP     O_TRUNC
 typedef struct flock flock_t;