introduce HAVE_TM_GMTOFF_IN_TM
Not all architectures have the tm.tm_gmtoff member. This fixes cygwin
builds.
diff --git a/openbsc/configure.ac b/openbsc/configure.ac
index 56e4b60..16eb732 100644
--- a/openbsc/configure.ac
+++ b/openbsc/configure.ac
@@ -83,6 +83,30 @@
AC_SUBST([COVERAGE_LDFLAGS])
fi
+AC_DEFUN([CHECK_TM_INCLUDES_TM_GMTOFF], [
+ AC_CACHE_CHECK(
+ [whether struct tm has tm_gmtoff member],
+ osmo_cv_tm_includes_tm_gmtoff,
+ [AC_LINK_IFELSE([
+ AC_LANG_PROGRAM([
+ #include <time.h>
+ ], [
+ time_t t = time(NULL);
+ struct tm* lt = localtime(&t);
+ int off = lt->tm_gmtoff;
+ ])
+ ],
+ osmo_cv_tm_includes_tm_gmtoff=yes,
+ osmo_cv_tm_includes_tm_gmtoff=no
+ )]
+ )
+ if test "x$osmo_cv_tm_includes_tm_gmtoff" = xyes; then
+ AC_DEFINE(HAVE_TM_GMTOFF_IN_TM, 1,
+ [Define if struct tm has tm_gmtoff member.])
+ fi
+])
+
+CHECK_TM_INCLUDES_TM_GMTOFF
dnl Generate the output
AM_CONFIG_HEADER(bscconfig.h)