1AC_DEFUN([AG_GST_BISON_CHECK],
2[
3  dnl FIXME: check if AC_PROG_YACC is suitable here
4  dnl FIXME: make precious
5  AC_PATH_PROG(BISON_PATH, bison, no)
6  if test x$BISON_PATH = xno; then
7    AC_MSG_ERROR(Could not find bison)
8  fi
9
10  dnl check bison version
11  dnl we need version >= 2.4 for the '<>' support
12  dnl in the parser.
13  dnl First lines observed: 'bison (GNU Bison) 2.3' or 'GNU Bison version 1.28'
14  bison_min_version=2.4
15  bison_version=`$BISON_PATH --version | head -n 1 |  sed 's/^[[^0-9]]*//' | sed 's/[[^0-9]]*$//' | cut -d' ' -f1`
16  AC_MSG_CHECKING([bison version $bison_version >= $bison_min_version])
17
18  if perl -we "exit (('v$bison_version' ge 'v$bison_min_version') ? 0 : 1)"; then
19    AC_MSG_RESULT([yes])
20  else
21    AC_MSG_ERROR([no])
22  fi
23])
24
25AC_DEFUN([AG_GST_FLEX_CHECK],
26[
27  dnl we require flex for building the parser
28  AC_PATH_PROG(FLEX_PATH, flex, no)
29  if test x$FLEX_PATH = xno; then
30    AC_MSG_ERROR(Could not find flex)
31  fi
32
33  dnl check flex version
34  dnl we need version >= 2.5.31 for the reentrancy support
35  dnl in the parser.
36  flex_min_version=2.5.31
37  flex_version=`$FLEX_PATH --version | head -n 1 | awk '{print $2}'`
38  AC_MSG_CHECKING([flex version $flex_version >= $flex_min_version])
39  if perl -w <<EOF
40    (\$min_version_major, \$min_version_minor, \$min_version_micro ) = "$flex_min_version" =~ /(\d+)\.(\d+)\.(\d+)/;
41    (\$flex_version_major, \$flex_version_minor, \$flex_version_micro ) = "$flex_version" =~ /(\d+)\.(\d+)\.(\d+)/;
42    exit (((\$flex_version_major > \$min_version_major) ||
43     ((\$flex_version_major == \$min_version_major) &&
44      (\$flex_version_minor > \$min_version_minor)) ||
45     ((\$flex_version_major == \$min_version_major) &&
46      (\$flex_version_minor == \$min_version_minor) &&
47      (\$flex_version_micro >= \$min_version_micro)))
48     ? 0 : 1);
49EOF
50  then
51    AC_MSG_RESULT(yes)
52  else
53    AC_MSG_ERROR([no])
54  fi
55])
56