Add module functions to convert from and to big integers.

* src/module-env-27.h: Add new module functions to convert big
integers.

* src/emacs-module.h.in (emacs_mpz): Define if GMP is available.

* src/emacs-module.c (module_extract_big_integer)
(module_make_big_integer): New functions.
(initialize_environment): Use them.

* test/data/emacs-module/mod-test.c (Fmod_test_double): New test
function.
(emacs_module_init): Define it.

* test/src/emacs-module-tests.el (mod-test-double): New unit test.

* doc/lispref/internals.texi (Module Values): Document new functions.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/lisp.h b/src/lisp.h
index d803f160006..703fe76d64e 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -4151,6 +4151,7 @@ extern void *unexec_realloc (void *, size_t);
 extern void unexec_free (void *);
 #endif
 
+#define EMACS_MODULE_GMP
 #include "emacs-module.h"
 
 /* Function prototype for the module Lisp functions.  */