Checking at configure time for timezone integer variable

acinclude.m4

@@ -314,3 +314,16 @@ dnl For debugging only
  
 ])
 
+dnl LIBBURNIA_TRY_TIMEZONE is by Thomas Schmitt, libburnia project
+dnl It tests whether the global variable exists and is suitable for
+dnl integer arithmetics.
+AC_DEFUN([LIBBURNIA_TRY_TIMEZONE],
+[
+    echo -n "checking for timezone variable ... "
+    AC_TRY_LINK([ #include <time.h> ], [long int i; i = 1 - timezone; ],
+                [LIBBURNIA_TIMEZONE="timezone"], [LIBBURNIA_TIMEZONE="0"]
+    )
+    echo "$LIBBURNIA_TIMEZONE"
+])
+
+

configure.ac

@@ -106,6 +106,16 @@ AC_CHECK_MEMBER([struct tm.tm_gmtoff],
 	,
 	[#include <time.h>])
 
+dnl Whether timezone is an integer variable
+AH_TEMPLATE([Libburnia_timezonE], [Either timezone or 0])
+LIBBURNIA_TRY_TIMEZONE
+if test x$LIBBURNIA_TIMEZONE = xtimezone
+then
+   AC_DEFINE([Libburnia_timezonE], [timezone])
+else
+   AC_DEFINE([Libburnia_timezonE], [0])
+fi
+
 THREAD_LIBS=-lpthread
 AC_SUBST(THREAD_LIBS)
 
@@ -120,7 +130,6 @@ dnl Important: Must be performed _after_ TARGET_SHIZZLE
 dnl
 LIBBURNIA_SET_PKGCONFIG
 
-
 AC_ARG_ENABLE(libreadline,
 [  --enable-libreadline    Enable use of libreadline by xorriso, default=yes],
                , enable_libreadline=yes)

xorriso/configure_ac.txt

@@ -97,6 +97,16 @@ AC_CHECK_DECL([timegm],
         ,
         [#include <time.h>])
 
+dnl Whether timezone is an integer variable
+AH_TEMPLATE([Libburnia_timezonE], [Either timezone or 0])
+LIBBURNIA_TRY_TIMEZONE
+if test x$LIBBURNIA_TIMEZONE = xtimezone
+then
+   AC_DEFINE([Libburnia_timezonE], [timezone])
+else
+   AC_DEFINE([Libburnia_timezonE], [0])
+fi
+
 dnl Check if non standard eaccess() function is available
 AC_CHECK_DECL([eaccess],
         [AC_DEFINE(HAVE_EACCESS, 1, [Define this if eaccess function is available])],

xorriso/misc_funct.c

@@ -646,7 +646,10 @@ time_t Decode_timestring(char *code, time_t *date, int flag)
 #else
      if(result_tm.tm_isdst < 0)
        result_tm.tm_isdst = 0;
-     seconds-= timezone - result_tm.tm_isdst * 3600;
+#ifndef Libburnia_timezonE
+#define Libburnia_timezonE timezone
+#endif
+     seconds-= Libburnia_timezonE - result_tm.tm_isdst * 3600;
 #endif
 
    }

xorriso/xorriso_timestamp.h

@@ -1 +1 @@
-#define Xorriso_timestamP "2014.11.13.180427"
+#define Xorriso_timestamP "2014.11.26.134709"