Adding upstream version 3.7.9.upstream/3.7.9upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 92 insertions, 0 deletions

diff --git a/src/gl/m4/bison.m4 b/src/gl/m4/bison.m4
new file mode 100644
index 0000000..0493587
--- /dev/null
+++ b/src/gl/m4/bison.m4
@@ -0,0 +1,92 @@
+# serial 10
+
+# Copyright (C) 2002-2006, 2008-2021 Free Software Foundation, Inc.
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# There are two types of parser skeletons:
+#
+# * Those that can be used with any Yacc implementation, including bison.
+#   For these, in the configure.ac, up to Autoconf 2.69, you could use
+#     AC_PROG_YACC
+#   In newer Autoconf versions, however, this macro is broken. See
+#     https://lists.gnu.org/archive/html/autoconf-patches/2013-03/msg00000.html
+#     https://lists.gnu.org/archive/html/bug-autoconf/2018-12/msg00001.html
+#   In the Makefile.am you could use
+#     $(SHELL) $(YLWRAP) $(srcdir)/foo.y \
+#                        y.tab.c foo.c \
+#                        y.tab.h foo.h \
+#                        y.output foo.output \
+#                        -- $(YACC) $(YFLAGS) $(AM_YFLAGS)
+#   or similar.
+#
+# * Those that make use of Bison extensions. For example,
+#     - %define api.pure   requires bison 2.7 or newer,
+#     - %precedence        requires bison 3.0 or newer.
+#   For these, in the configure.ac you will need an invocation of
+#     gl_PROG_BISON([VARIABLE], [MIN_BISON_VERSION])
+#   Example:
+#     gl_PROG_BISON([PARSE_DATETIME_BISON], [2.4])
+#   With this preparation, in the Makefile.am there are two ways to formulate
+#   the invocation. Both are direct, without use of 'ylwrap'.
+#   (a) You can invoke
+#         $(VARIABLE) -d $(SOME_BISON_OPTIONS) --output foo.c $(srcdir)/foo.y
+#       or similar.
+#   (b) If you want the invocation to honor an YFLAGS=... parameter passed to
+#       'configure' or an YFLAGS environment variable present at 'configure'
+#       time, add an invocation of gl_BISON to the configure.ac, and write
+#         $(VARIABLE) -d $(YFLAGS) $(AM_YFLAGS) $(srcdir)/foo.y
+#       or similar.
+
+# This macro defines the autoconf variable VARIABLE to 'bison' if the specified
+# minimum version of bison is found in $PATH, or to ':' otherwise.
+AC_DEFUN([gl_PROG_BISON],
+[
+  AC_CHECK_PROGS([$1], [bison])
+  if test -z "$[$1]"; then
+    ac_verc_fail=yes
+  else
+    cat >conftest.y <<_ACEOF
+%require "$2"
+%%
+exp:
+_ACEOF
+    AC_MSG_CHECKING([for bison $2 or newer])
+    ac_prog_version=`$$1 --version 2>&1 | sed -n 's/^.*GNU Bison.* \([[0-9]]*\.[[0-9.]]*\).*$/\1/p'`
+    : ${ac_prog_version:='v. ?.??'}
+    if $$1 conftest.y -o conftest.c 2>/dev/null; then
+      ac_prog_version="$ac_prog_version, ok"
+      ac_verc_fail=no
+    else
+      ac_prog_version="$ac_prog_version, bad"
+      ac_verc_fail=yes
+    fi
+    rm -f conftest.y conftest.c
+    AC_MSG_RESULT([$ac_prog_version])
+  fi
+  if test $ac_verc_fail = yes; then
+    [$1]=:
+  fi
+  AC_SUBST([$1])
+])
+
+# This macro sets the autoconf variables YACC (for old-style yacc Makefile
+# rules) and YFLAGS (to allow options to be passed as 'configure' time).
+AC_DEFUN([gl_BISON],
+[
+  : ${YACC='bison -o y.tab.c'}
+dnl
+dnl Declaring YACC & YFLAGS precious will not be necessary after GNULIB
+dnl requires an Autoconf greater than 2.59c, but it will probably still be
+dnl useful to override the description of YACC in the --help output, re
+dnl parse-datetime.y assuming 'bison -o y.tab.c'.
+  AC_ARG_VAR([YACC],
+[The "Yet Another C Compiler" implementation to use.  Defaults to
+'bison -o y.tab.c'.  Values other than 'bison -o y.tab.c' will most likely
+break on most systems.])dnl
+  AC_ARG_VAR([YFLAGS],
+[YFLAGS contains the list arguments that will be passed by default to Bison.
+This script will default YFLAGS to the empty string to avoid a default value of
+'-d' given by some make applications.])dnl
+])