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| author | Bruno Haible <bruno@clisp.org> | 2019-07-19 05:00:10 +0200 |
|---|---|---|
| committer | Bruno Haible <bruno@clisp.org> | 2019-07-20 00:25:01 +0200 |
| commit | 56d28ccbbc69a7d16f3a4f64288900777623fdf1 (patch) | |
| tree | 32d76abefa48da63114801f83eb9a2eac938333d /m4/parse-datetime.m4 | |
| parent | c01635497d830f181a2607279135b3fff041b936 (diff) | |
| download | gnulib-56d28ccbbc69a7d16f3a4f64288900777623fdf1.tar.gz | |
parse-datetime: Require Bison 2.4 or newer.
* m4/parse-datetime.m4 (gl_PARSE_DATETIME): Set PARSE_DATETIME_BISON.
Code taken from gettext's intl.m4.
* modules/parse-datetime (Makefile.am): Use PARSE_DATETIME_BISON instead
of YACC.
Diffstat (limited to 'm4/parse-datetime.m4')
| -rw-r--r-- | m4/parse-datetime.m4 | 33 |
1 files changed, 32 insertions, 1 deletions
diff --git a/m4/parse-datetime.m4 b/m4/parse-datetime.m4 index 597a44c552..885fa5761e 100644 --- a/m4/parse-datetime.m4 +++ b/m4/parse-datetime.m4 @@ -1,4 +1,4 @@ -# parse-datetime.m4 serial 22 +# parse-datetime.m4 serial 23 dnl Copyright (C) 2002-2006, 2008-2019 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, @@ -26,6 +26,37 @@ AC_DEFUN([gl_C_COMPOUND_LITERALS], AC_DEFUN([gl_PARSE_DATETIME], [ + dnl parse-datetime.c is generated from parse-datetime.y. It requires bison, + dnl because parse-datetime.y uses bison specific features. It requires at + dnl least bison-2.4 for %define api.pure. + dnl bison is only needed for the maintainer (who touches parse-datetime.y). + dnl But in order to avoid separate Makefiles or --enable-maintainer-mode, + dnl we put the rule in general Makefile. Now, some people carelessly touch + dnl the files or have a broken "make" program, hence the parse-datetime.c + dnl rule will sometimes fire. To avoid an error, defines PARSE_DATETIME_BISON + dnl to ":" if it is not present or too old. + AC_CHECK_PROGS([PARSE_DATETIME_BISON], [bison]) + if test -z "$PARSE_DATETIME_BISON"; then + ac_verc_fail=yes + else + dnl Found it, now check the version. + AC_MSG_CHECKING([version of bison]) +changequote(<<,>>)dnl + ac_prog_version=`$PARSE_DATETIME_BISON --version 2>&1 | sed -n 's/^.*GNU Bison.* \([0-9]*\.[0-9.]*\).*$/\1/p'` + case $ac_prog_version in + '') ac_prog_version="v. ?.??, bad"; ac_verc_fail=yes;; + 1.* | 2.[0-3] | 2.[0-3].*) +changequote([,])dnl + ac_prog_version="$ac_prog_version, bad"; ac_verc_fail=yes;; + *) ac_prog_version="$ac_prog_version, ok"; ac_verc_fail=no;; + esac + AC_MSG_RESULT([$ac_prog_version]) + fi + if test $ac_verc_fail = yes; then + PARSE_DATETIME_BISON=: + fi + AC_SUBST([PARSE_DATETIME_BISON]) + dnl Prerequisites of lib/parse-datetime.h. AC_REQUIRE([AM_STDBOOL_H]) AC_REQUIRE([gl_TIMESPEC]) |