diff --git a/m4/acinclude.m4 b/m4/acinclude.m4
index ee2fc1b97ca466123b3450081c07939996269c6a..e12477f29738cf30c8c0f18a43808a5cd34ef5d0 100644 (file)
--- a/m4/acinclude.m4
+++ b/m4/acinclude.m4
AC_MSG_CHECKING([if IEEE math works $1])
AC_CACHE_VAL([rd_cv_ieee_$2],
[AC_RUN_IFELSE([AC_LANG_SOURCE([[$3
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) && defined(FP_SNAN) && defined(FP_QNAN))
-# 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) && defined(FP_NEG_INF) && defined( FP_POS_INF) )
-# 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;
#include <stdio.h>
int main(void){
double rrdnan,rrdinf,rrdc,rrdzero;
])
])
+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
+])