test for tm.tm_gmtoff presence in configure.ac fix for #330

[rrdtool.git] / m4 / acinclude.m4

diff --git a/m4/acinclude.m4 b/m4/acinclude.m4
index c1e5c4b..e12477f 100644 (file)
--- a/m4/acinclude.m4
+++ b/m4/acinclude.m4
@@ -339,61 +339,7 @@ AC_DEFUN([AC_IEEE], [
 AC_MSG_CHECKING([if IEEE math works $1])
 AC_CACHE_VAL([rd_cv_ieee_$2],
 [AC_RUN_IFELSE([AC_LANG_SOURCE([[$3
-
-#if HAVE_MATH_H
-#  include <math.h>
-#endif
-
-#if HAVE_FLOAT_H
-#  include <float.h>  
-#endif
-
-#if HAVE_IEEEFP_H
-#  include <ieeefp.h>
-#endif
-
-#if HAVE_FP_CLASS_H
-#  include <fp_class.h>
-#endif
-
-/* Solaris */
-#if (! defined(HAVE_ISINF) && defined(HAVE_FPCLASS))
-#  define HAVE_ISINF 1
-#  define isinf(a) (fpclass(a) == FP_NINF || fpclass(a) == FP_PINF)
-#endif
-
-/* solaris 10 it defines isnan such that only forte can compile it ... bad bad  */
-#if (defined(HAVE_ISNAN) && defined(isnan) && defined(HAVE_FPCLASS))
-#  undef isnan
-#  define isnan(a) (fpclass(a) == FP_SNAN || fpclass(a) == FP_QNAN)
-#endif
-
-/* Digital UNIX */
-#if (! defined(HAVE_ISINF) && defined(HAVE_FP_CLASS) && defined(HAVE_FP_CLASS_H))
-#  define HAVE_ISINF 1
-#  define isinf(a) (fp_class(a) == FP_NEG_INF || fp_class(a) == FP_POS_INF)
-#endif 
-
-/* AIX */
-#if (! defined(HAVE_ISINF) && defined(HAVE_CLASS))
-#  define HAVE_ISINF 1
-#  define isinf(a) (class(a) == FP_MINUS_INF || class(a) == FP_PLUS_INF)
-#endif
-
-#if (! defined(HAVE_ISINF) && defined(HAVE_FPCLASSIFY) && defined(FP_PLUS_INF) && defined(FP_MINUS_INF))
-#  define HAVE_ISINF 1
-#  define isinf(a) (fpclassify(a) == FP_MINUS_INF || fpclassify(a) == FP_PLUS_INF)
-#endif
-
-#if (! defined(HAVE_ISINF) && defined(HAVE_FPCLASSIFY) && defined(FP_INFINITE))
-#  define HAVE_ISINF 1
-#  define isinf(a) (fpclassify(a) == FP_INFINITE)
-#endif
-
-#if HAVE_MATH_H
-#include <math.h>
-#endif
-
+#include "src/rrd_config_bottom.h"
 #include <stdio.h>
 int main(void){
     double rrdnan,rrdinf,rrdc,rrdzero;
@@ -524,6 +470,8 @@ AC_CACHE_VAL([rd_cv_ms_async],
 #include <sys/mman.h>
 #include <stdlib.h>
 #include <utime.h>
+#include <signal.h>
+void timeout (int i) { exit (1); }
 int main(void){
         int fd;
         struct stat stbuf;
@@ -531,7 +479,6 @@ int main(void){
         int res;
         char temp[] = "mmaptestXXXXXX";
         struct utimbuf newtime;
-
         time_t create_ts;
         fd = mkstemp(temp);
         if (fd == -1){
@@ -560,13 +507,17 @@ int main(void){
            perror("close");
            goto bad_exit;
         }
+        /* there were reports of sync hanging
+           so we better set an alarm */
+        signal(SIGALRM,&timeout);
+        alarm(5);
         /* The ASYNC means that we schedule the msync and return immediately.
            Since we want to see if the modification time is updated upon
            msync(), we have to make sure that our asynchronous request
            completes before we stat below. In a real application, the
            request would be completed at a random time in the future
            but for this test we do not want to wait an arbitrary amount of
-           time, so force a commit now.  */
+           time, so force a commit now.  */        
         sync();
         stat(temp, &stbuf);
         if (create_ts > stbuf.st_mtime){
@@ -594,3 +545,68 @@ fi
 
 ])
 
+dnl idea taken from the autoconf mailing list, posted by
+dnl Timur I. Bakeyev  timur@gnu.org, 
+dnl http://mail.gnu.org/pipermail/autoconf/1999-October/008311.html
+dnl partly rewritten by Peter Stamfest <peter@stamfest.at>
+
+dnl This determines, if struct tm containes tm_gmtoff field
+dnl or we should use extern long int timezone.
+
+dnl Add the following to your acconfig.h:
+
+dnl /* Define if your struct tm has tm_gmtoff.  */
+dnl #undef HAVE_TM_GMTOFF
+dnl #undef TM_GMTOFF
+dnl
+dnl /* Define if you don't have tm_gmtoff but do have the external timezone. */
+dnl #undef HAVE_TIMEZONE
+
+AC_DEFUN([GC_TIMEZONE], [
+        AC_REQUIRE([AC_STRUCT_TM])
+        AC_CACHE_CHECK([tm_gmtoff in struct tm], gq_cv_have_tm_gmtoff,
+                gq_cv_have_tm_gmtoff=no
+                AC_TRY_COMPILE([#include <time.h>
+                                #include <$ac_cv_struct_tm>
+                                ],
+                               [struct tm t;
+                                t.tm_gmtoff = 0;
+                                exit(0);
+                                ],
+                               gq_cv_have_tm_gmtoff=yes
+                        )
+        )
+
+        AC_CACHE_CHECK([__tm_gmtoff in struct tm], gq_cv_have___tm_gmtoff,
+                gq_cv_have___tm_gmtoff=no
+                AC_TRY_COMPILE([#include <time.h>
+                                #include <$ac_cv_struct_tm>
+                                ],
+                               [struct tm t;
+                                t.__tm_gmtoff = 0;
+                                exit(0);
+                                ],
+                               gq_cv_have___tm_gmtoff=yes
+                        )
+        )
+
+        if test "$gq_cv_have_tm_gmtoff" = yes ; then
+                AC_DEFINE(HAVE_TM_GMTOFF,1,[does tm have a tm_gmtoff member])
+                AC_DEFINE(TM_GMTOFF, tm_gmtoff,[the real name of tm_gmtoff])
+        elif test "$gq_cv_have___tm_gmtoff" = yes ; then
+                AC_DEFINE(HAVE_TM_GMTOFF)
+                AC_DEFINE(TM_GMTOFF, __tm_gmtoff)
+        else
+                AC_CACHE_CHECK(for timezone, ac_cv_var_timezone,
+                               [AC_TRY_LINK([
+                                             #include <time.h>
+                                             extern long int timezone;
+                                ],
+                               [long int l = timezone;], 
+                                ac_cv_var_timezone=yes, 
+                                ac_cv_var_timezone=no)])
+                if test $ac_cv_var_timezone = yes; then
+                        AC_DEFINE(HAVE_TIMEZONE,1,[is there an external timezone variable instead ?])
+                fi
+        fi
+])