From 3901e13de2b65d332f714638ebf8871cd3eceb9d Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Sun, 02 Sep 2018 19:28:21 -0400
Subject: configure.ac, config.sh.in: Check for date with %s

---
(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 756e494..ae4fbab 100644
--- a/configure.ac
+++ b/configure.ac
@@ -58,6 +58,38 @@ AC_ARG_WITH(
 	]
 )
 
+AC_ARG_WITH(
+	[date],
+	[AS_HELP_STRING([--with-date=PATH],
+		[path to date utility with `%s' format specifier])],
+	dnl This `dnl' is needed to workaround Vim syntax highlighting.
+	[
+		case "${withval}" in
+			'yes'|'')
+				AC_MSG_ERROR(
+					[--with-date requires an argument])
+				;;
+			'no')
+				AC_MSG_ERROR([date is required])
+				;;
+			*)
+				DATE="${withval}"
+				AC_SUBST([DATE])
+				;;
+		esac
+	],
+	[
+		AC_PATH_PROG([DATE], [date])
+		if test -z "${DATE}"; then
+			AC_MSG_ERROR([date not found])
+		fi
+	]
+)
+dnl Ugh, quadrigraphs.
+case "$(date '+%s' 2>/dev/null)" in *@<:@!0-9@:>@*)
+	AC_MSG_ERROR([${DATE} doesn't support the `%s' format sequence])
+esac
+
 AC_CONFIG_FILES([Makefile])
 AC_CONFIG_FILES([config.sh])
 AC_CONFIG_FILES([tests/aux/defs.sh])
--
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