X-Git-Url: https://git.distorted.org.uk/~mdw/cfd/blobdiff_plain/4cb2b0916988d634cbdff76dd823ff2d85be5689..7cc492bc2769cc3f095aadb86c18e53f7b5fea46:/aclocal.glob

diff --git a/aclocal.glob b/aclocal.glob
index 6e48f26..957a9d0 100644
--- a/aclocal.glob
+++ b/aclocal.glob
@@ -39,9 +39,10 @@ dnl		ARGS = arguments to pass
 dnl
 dnl Use:	Like `AC_REQUIRE', only it handles arguments.
 
+m4_define([_m4_divert(mdwdvt_REQUIRE)], 54633)
 AC_DEFUN([mdw_REQUIRE],
 [ifdef([AC_PROVIDE_$1], ,
-[AC_DIVERT_PUSH(builtin(eval, AC_DIVERSION_CURRENT - 1))dnl
+[AC_DIVERT_PUSH([mdwdvt_REQUIRE])dnl
 indir($@)
 AC_DIVERT_POP()dnl
 ])])
@@ -173,6 +174,89 @@ else :
   $4
 fi])
 
+dnl --- *@-mdw__PYTHON_VERSION-@* ---
+dnl
+dnl Will fail hopelessly on Python < 1.5.2.  Nobody uses that any more, 
+dnl right?
+
+AC_DEFUN([mdw__PYTHON_VERSION],
+[$1 -c 'from sys import *; v = argv[1]; vv = v.split("."); x = 0
+for i in range(len(vv)): x = x | (int(vv[i]) << (24 - i * 8))
+exit(x > hexversion)' $2])
+
+dnl --- *@-mdw_PROG_PYTHON-@* ---
+dnl
+dnl Author:	Mark Wooding
+dnl
+dnl Synopsis:	mdw_PROG_PYTHON(VERSION, [IF-FOUND], [IF-NOT-FOUND])
+dnl
+dnl Arguments:	VERSION = version number of Python required
+dnl		IF-FOUND = what to do if it's found
+dnl		IF-NOT-FOUND = what to do if it isn't
+dnl
+dnl Use:	Attempts to find a working version of Python with a late
+dnl		enough version number.  It supplies an option `--with-python'
+dnl		to allow the user to provide a Python interpreter.  If one
+dnl		isn't provided explicitly, it searches for `python' and 
+dnl		`pythonVERSION' in the current PATH, asking them whether they
+dnl		have a late enough version number.  The path of the working
+dnl		Python is put into the `PYTHON' environment variable;
+dnl		`AC_SUBST' is used to substitute its value into Python 
+dnl		scripts.  If there is no Python to be found, the value of 
+dnl		`PYTHON' is set to be `none'.
+
+AC_DEFUN([mdw_PROG_PYTHON],
+[AC_ARG_WITH([python],
+[  --with-python=PYTHON	  specify path to Python version $1 or newer],
+[PYTHON="$withval"],
+if test -z "$PYTHON"; then
+[AC_CACHE_CHECK([for Python version $1 or later], mdw_cv_prog_python,
+[mdw_cv_prog_python="none"
+for p in `echo "$PATH:/usr/local/bin" | tr ":" " "`; do
+  case $p in /*) ;; *) p=`pwd`/$p ;; esac
+  if mdw__PYTHON_VERSION(["$p/python"], $1); then
+    mdw_cv_prog_python="$p/python"
+    break
+  fi
+  if mdw__PYTHON_VERSION(["$p/python$1"], $1); then
+    mdw_cv_prog_python="$p/python$1"
+    break
+  fi
+done])
+PYTHON="$mdw_cv_prog_python"])
+fi
+
+AC_SUBST(PYTHON)dnl
+if test "$PYTHON" = "none"; then :
+  $3
+else :
+  $2
+fi])
+
+dnl --- *@-mdw_CHECK_PYTHON-@* ---
+dnl
+dnl Author:	Mark Wooding
+dnl
+dnl Synopsis:	mdw_CHECK_PYTHON(VERSION)
+dnl
+dnl Arguments:	VERSION = version number of Python required
+dnl
+dnl Use:	Verifies that the Python interpreter in the `PYTHON' shell
+dnl		variable actually works and is of the right version.  If it's
+dnl		not, an error is raised and configuration is aborted.
+
+AC_DEFUN([mdw_CHECK_PYTHON],
+[mdw_REQUIRE([mdw_PROG_PYTHON], [$1])
+AC_MSG_CHECKING([whether Python ($PYTHON) works])
+if test "$PYTHON" != "none" && mdw__PYTHON_VERSION("$PYTHON", $1); then
+  AC_MSG_RESULT([yes])
+else
+  AC_MSG_RESULT([no])
+  AC_MSG_ERROR([Python version $1 or newer not found.
+If you have a recent enough Python, and I just failed to find it, try using
+the --with-python=PYTHON option to give me an explicit pathname.])
+fi])
+
 dnl --- *@-mdw__PERL_VERSION-@* ---
 dnl
 dnl AC_DEFUN relies on `[', `]' being quotes, so I have to drop down a level.