From 30d7f61f4fc1967190a734e2d62696d546fb6378 Mon Sep 17 00:00:00 2001
From: Karel Zak
Date: Sat, 4 Mar 2017 11:01:56 -0500
Subject: build-sys: add parse-date.y

* add lib/parse-date.y to build system
* add necessary autotools stuff to generate .c on the fly
  (autotools are smart enough to add generated file to tarball)
* check for bison version by ./autogen.sh
* add non-wanted junk to .gitignore

With some modification by J William Piggott with regard to
moving the parse-date API into timeutils.h

Signed-off-by: J William Piggott <elseifthen@gmx.com>
---
 .gitignore        |  1 +
 autogen.sh        | 20 ++++++++++++++++++++
 configure.ac      |  2 +-
 lib/.gitignore    |  1 +
 lib/Makemodule.am |  1 +
 5 files changed, 24 insertions(+), 1 deletion(-)
 create mode 100644 lib/.gitignore

diff --git a/.gitignore b/.gitignore
index 8630feacf..6c87c6be4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -55,6 +55,7 @@ test-suite.log
 tests/run.sh.log
 tests/run.sh.trs
 update.log
+ylwrap
 
 #
 # binaries
diff --git a/autogen.sh b/autogen.sh
index 116885bc7..04b6cb459 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -67,6 +67,25 @@ test -f sys-utils/mount.c || {
 	DIE=1
 }
 
+if ! (bison --version) < /dev/null > /dev/null 2>&1; then
+	echo
+	echo "You must have bison installed to build the util-linux."
+	echo
+	DIE=1
+else
+	lexver=$(bison --version | awk '/bison \(GNU Bison\)/ { print $4 }')
+	case "$lexver" in
+		[2-9].*)
+			;;
+		*)
+			echo
+			echo "You must have bison version >= 2.x, but you have $lexver."
+			echo
+			DIE=1
+			;;
+	esac
+fi
+
 LIBTOOLIZE=libtoolize
 case `uname` in Darwin*) LIBTOOLIZE=glibtoolize ;; esac
 if ! ($LIBTOOLIZE --version) < /dev/null > /dev/null 2>&1; then
@@ -104,6 +123,7 @@ echo "   autoconf:   $(autoconf --version | head -1)"
 echo "   autoheader: $(autoheader --version | head -1)"
 echo "   automake:   $(automake --version | head -1)"
 echo "   libtoolize: $($LIBTOOLIZE --version | head -1)"
+echo "   bison:      $(bison --version | head -1)"
 
 rm -rf autom4te.cache
 
diff --git a/configure.ac b/configure.ac
index 8933afa6f..17c3b23e7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -99,6 +99,7 @@ AC_SUBST([usrlib_execdir])
 AM_PROG_CC_C_O
 AC_PROG_MKDIR_P
 AC_PROG_CC_STDC
+AC_PROG_YACC
 AC_CANONICAL_HOST
 AC_C_CONST
 AC_C_VOLATILE
@@ -153,7 +154,6 @@ PKG_PROG_PKG_CONFIG
 GTK_DOC_CHECK([1.10])
 AC_PATH_PROG([XSLTPROC], [xsltproc])
 
-
 linux_os=no
 bsd_os=no
 AS_CASE([${host_os}],
diff --git a/lib/.gitignore b/lib/.gitignore
new file mode 100644
index 000000000..070c244be
--- /dev/null
+++ b/lib/.gitignore
@@ -0,0 +1 @@
+parse-date.c
diff --git a/lib/Makemodule.am b/lib/Makemodule.am
index d20a9aca2..358b85aee 100644
--- a/lib/Makemodule.am
+++ b/lib/Makemodule.am
@@ -16,6 +16,7 @@ libcommon_la_SOURCES = \
 	lib/mbsedit.c\
 	lib/md5.c \
 	lib/pager.c \
+	lib/parse-date.y \
 	lib/path.c \
 	lib/randutils.c \
 	lib/setproctitle.c \
-- 
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