include warnings about small time_t

1 files changed, 9 insertions, 3 deletions

diff --git a/configure.ac b/configure.ac
index e97991d..148ca64 100644
--- a/configure.ac
+++ b/configure.ac
@@ -48,9 +48,6 @@ AM_CONDITIONAL([BUILD_CERTHASH], [test "x$ac_cv_func_symlink" = xyes])
 # Check if funopen exists
 AC_CHECK_FUNC([funopen])
 
-# Check if time_t is sized correctly
-AC_CHECK_SIZEOF([time_t], [time.h])
-
 CHECK_LIBC_COMPAT
 CHECK_SYSCALL_COMPAT
 CHECK_CRYPTO_COMPAT
@@ -117,6 +114,9 @@ AM_CONDITIONAL([HOST_ASM_ELF_X86_64],
 AM_CONDITIONAL([HOST_ASM_MACOSX_X86_64],
     [test "x$HOST_ABI" = "xmacosx" -a "$host_cpu" = "x86_64" -a "x$enable_asm" != "xno"])
 
+# Check if time_t is sized correctly
+AC_CHECK_SIZEOF([time_t], [time.h])
+
 AC_CONFIG_FILES([
         Makefile
         include/Makefile
@@ -135,4 +135,10 @@ AC_CONFIG_FILES([
         openssl.pc
 ])
 
+AM_CONDITIONAL([SMALL_TIME_T], [test "$ac_cv_sizeof_time_t" = "4"])
+if test "$ac_cv_sizeof_time_t" = "4"; then
+    echo " ** Warning, this system is unable to represent times past 2038"
+    echo " ** It will behave incorrectly when handling valid RFC5280 dates"
+fi
+
 AC_OUTPUT