From 36c7c208191a0fd34cf48bdfb4af66b4ab0ec594 Mon Sep 17 00:00:00 2001
From: Jay Berkenbilt <ejb@ql.org>
Date: Sat, 17 Apr 2021 18:12:55 -0400
Subject: Fix timezone portability issue (fixes #515)

---
 configure.ac | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 7cf58123..a1c4e5fb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -520,6 +520,35 @@ if test "$BUILDRULES" != "msvc"; then
    fi
 fi
 
+AC_MSG_CHECKING(for tm_gmtoff in struct tm)
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+      #include <time.h>
+   ]],[[
+      struct tm tm;
+      tm.tm_gmtoff = 1;
+   ]])], [qpdf_TM_GMTOFF=1], [qpdf_TM_GMTOFF=0])
+if test "$qpdf_TM_GMTOFF" = "1"; then
+   AC_MSG_RESULT(yes)
+   AC_DEFINE([HAVE_TM_GMTOFF], [1], [Whether struct tm has tm_gmtoff])
+else
+   AC_MSG_RESULT(no)
+fi
+
+AC_MSG_CHECKING(for extern long timezone)
+AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+      #include <time.h>
+      #include <stdio.h>
+   ]],[[
+      tzset();
+      printf("%ld\n", timezone);
+   ]])], [qpdf_EXTERN_LONG_TIMEZONE=1], [qpdf_EXTERN_LONG_TIMEZONE=0])
+if test "$qpdf_EXTERN_LONG_TIMEZONE" = "1"; then
+   AC_MSG_RESULT(yes)
+   AC_DEFINE([HAVE_EXTERN_LONG_TIMEZONE], [1], [Whether extern long timezone is available])
+else
+   AC_MSG_RESULT(no)
+fi
+
 LL_FMT=""
 oCFLAGS=$CFLAGS
 CFLAGS="$WFLAGS $CFLAGS"
-- 
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