Fix Large File Support (LFS) support (bug #182)

- _FILE_OFFSET_BITS must be defined before including any other system
headers otherwise it does nothing.

- Don't define it in rsyslog.h, let it be defined in config.h,
  and let ./configure script enable LFS since Autoconf provides
  a portable macro to enable LFS support : AC_SYS_LARGEFILE

configure.ac

@@ -152,19 +152,12 @@ AC_SUBST(moddirs)
 
 
 # Large file support
-AC_ARG_ENABLE(largefile,
-        [AS_HELP_STRING([--enable-largefile],[Enable large file support @<:@default=yes@:>@])],
-        [case "${enableval}" in
-         yes) enable_largefile="yes" ;;
-          no) enable_largefile="no" ;;
-           *) AC_MSG_ERROR(bad value ${enableval} for --enable-largefile) ;;
-         esac],
-        [enable_largefile="yes"]
-)
-if test "$enable_largefile" = "no"; then
-        AC_DEFINE(NOLARGEFILE, 1, [Defined when large file support is disabled.])
-fi
-
+# http://www.gnu.org/software/autoconf/manual/html_node/System-Services.html#index-AC_005fSYS_005fLARGEFILE-1028
+AC_SYS_LARGEFILE
+case "${enable_largefile}" in
+  no) ;;
+  *) enable_largefile="yes" ;;
+esac
 
 # Regular expressions
 AC_ARG_ENABLE(regexp,

runtime/rsyslog.h

@@ -46,15 +46,6 @@
  * #                  End Config Settings                      # *
  * ############################################################# */
 
-#ifndef	NOLARGEFILE
-#	undef _LARGEFILE_SOURCE  
-#	undef _LARGEFILE64_SOURCE  
-#	undef _FILE_OFFSET_BITS
-#	define _LARGEFILE_SOURCE  
-#	define _LARGEFILE64_SOURCE  
-#	define _FILE_OFFSET_BITS 64
-#endif
-
 /* portability: not all platforms have these defines, so we
  * define them here if they are missing. -- rgerhards, 2008-03-04
  */

tools/syslogd.c

@@ -2770,7 +2770,7 @@ static void printVersion(void)
 #else
 	printf("\tFEATURE_REGEXP:\t\t\t\tNo\n");
 #endif
-#ifndef	NOLARGEFILE
+#if defined(_LARGE_FILES) || (defined (_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS >= 64)
 	printf("\tFEATURE_LARGEFILE:\t\t\tYes\n");
 #else
 	printf("\tFEATURE_LARGEFILE:\t\t\tNo\n");