[RFC PATCH] tools/configure: require OCaml >= 4.06.1 for oxenstored

[Edwin Török <edvin.torok@xxxxxxxxxx>]

OCaml 4.06.1 is widely available in distributions: 
https://repology.org/project/ocaml/versions

oxenstored already includes some compatibility code to be able to run on
versions older than 4.06, however this is slightly less efficient than
just using the new features in 4.06 standard library:
https://lore.kernel.org/xen-devel/b94cd2ad099486678609909e12b045c54abb2f27.camel@xxxxxxxxxx/

The OCaml version in stubdom/ is unchanged for now as it is unclear how
this used. Typically to run OCaml code as a stubdom one would use the mirage
tooling to build a unikernel, which handles cross-compilation using
Dune.
The unikernel itself also uses Solo5 instead of MiniOS, so the OCaml
code in stubdom/ is probably stale.

Signed-off-by: Edwin Török <edvin.torok@xxxxxxxxxx>
Cc: Christian Lindig <christian.lindig@xxxxxxxxxx>
---
 tools/configure    | 2 +-
 tools/configure.ac | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/configure b/tools/configure
index 41deb7fb96..8f391e2da4 100755
--- a/tools/configure
+++ b/tools/configure
@@ -6765,7 +6765,7 @@ else
                      -e 's/[^0-9]//g'`
 
 
-  ax_compare_version_B=`echo "4.02.0" | sed -e 's/\([0-9]*\)/Z\1Z/g' \
+  ax_compare_version_B=`echo "4.06.1" | sed -e 's/\([0-9]*\)/Z\1Z/g' \
                      -e 's/Z\([0-9]\)Z/Z0\1Z/g' \
                      -e 's/Z\([0-9][0-9]\)Z/Z0\1Z/g' \
                      -e 's/Z\([0-9][0-9][0-9]\)Z/Z0\1Z/g' \
diff --git a/tools/configure.ac b/tools/configure.ac
index 32cbe6bd3c..7518199ec8 100644
--- a/tools/configure.ac
+++ b/tools/configure.ac
@@ -310,7 +310,7 @@ AS_IF([test "x$ocamltools" = "xy"], [
             AC_MSG_ERROR([Ocaml tools enabled, but missing ocamlopt or 
ocamlfind])])
         ocamltools="n"
     ], [
-        AX_COMPARE_VERSION([$OCAMLVERSION], [lt], [4.02.0], [
+        AX_COMPARE_VERSION([$OCAMLVERSION], [lt], [4.06.1], [
             AS_IF([test "x$enable_ocamltools" = "xyes"], [
                 AC_MSG_ERROR([Your version of OCaml: $OCAMLVERSION is not 
supported])])
             ocamltools="n"
-- 
2.34.1