[gnutls-devel] GnuTLS | Cross-compilation of the Guile bindings (#1137)

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Evgeny Ermakov created an issue: https://gitlab.com/gnutls/gnutls/-/issues/1137



Hello! I'm trying to cross build `gnutls` with `guile-3.0.4`, but I got an error: 
```
  GEN      modules/gnutls.scm
  GUILEC   modules/gnutls.go
  GUILEC   modules/gnutls/extra.go
Backtrace:
In ice-9/psyntax.scm:
  1241:36 19 (expand-top-sequence ((define-module (gnutls extra) *)) *)
  1233:19 18 (parse _ (("placeholder" placeholder)) ((top) #(# # *)) *)
   285:10 17 (parse _ (("placeholder" placeholder)) (()) _ c&e (# #) #)
In ice-9/eval.scm:
   293:34 16 (_ #<module (#{ g97}#) 7fe40b3bac80>)
In ice-9/boot-9.scm:
   3380:4 15 (define-module* _ #:filename _ #:pure _ #:version _ # _ *)
  2565:24 14 (call-with-deferred-observers #<procedure 7fe40b9b1050 *>)
  3393:24 13 (_)
   222:17 12 (map1 (((gnutls))))
  3297:17 11 (resolve-interface (gnutls) #:select _ #:hide _ #:prefix *)
In ice-9/threads.scm:
    390:8 10 (_ _)
In ice-9/boot-9.scm:
  3223:13  9 (_)
In ice-9/threads.scm:
    390:8  8 (_ _)
In ice-9/boot-9.scm:
  3507:20  7 (_)
   2806:4  6 (save-module-excursion #<procedure 7fe40a59d570 at ice-*>)
  3527:26  5 (_)
In unknown file:
           4 (primitive-load-path "gnutls" #<procedure 7fe40a50d240 *>)
In ice-9/eval.scm:
   626:19  3 (_ #<directory (gnutls) 7fe40b3baaa0>)
   223:20  2 (proc #<directory (gnutls) 7fe40b3baaa0>)
In unknown file:
           1 (%resolve-variable (7 . protocol/ssl3) #<directory (gnu*>)
In ice-9/boot-9.scm:
  1669:16  0 (raise-exception _ #:continuable? _)

ice-9/boot-9.scm:1669:16: In procedure raise-exception:
Unbound variable: protocol/ssl3
make[3]: *** [Makefile:2520: modules/gnutls/extra.go] Error 1
make[3]: *** Waiting for unfinished jobs....
```

Here's the patch I propose:

```diff
--- guile/modules/gnutls.in
+++ guile/modules/gnutls.in
@@ -566,20 +566,33 @@
 
 
 ;; Renaming.
-(define protocol/ssl-3 protocol/ssl3)
-(define protocol/tls-1.0 protocol/tls1-0)
-(define protocol/tls-1.1 protocol/tls1-1)
+(define protocol/ssl-3 #f)
+(define protocol/tls-1.0 #f)
+(define protocol/tls-1.1 #f)
 
 ;; Aliases.
-(define credentials/anonymous   credentials/anon)
-(define cipher/rijndael-256-cbc cipher/aes-256-cbc)
-(define cipher/rijndael-128-cbc cipher/aes-128-cbc)
-(define cipher/rijndael-cbc     cipher/aes-128-cbc)
-(define cipher/arcfour-128      cipher/arcfour)
-(define certificate-verify/allow-any-x509-v1-ca-certificate
-  certificate-verify/allow-any-x509-v1-ca-crt)
-(define certificate-verify/allow-x509-v1-ca-certificate
-  certificate-verify/allow-x509-v1-ca-crt)
+(define credentials/anonymous   #f)
+(define cipher/rijndael-256-cbc #f)
+(define cipher/rijndael-128-cbc #f)
+(define cipher/rijndael-cbc     #f)
+(define cipher/arcfour-128      #f)
+(define certificate-verify/allow-any-x509-v1-ca-certificate #f)
+(define certificate-verify/allow-x509-v1-ca-certificate     #f)
+
+(eval-when (load eval)
+  (unless (getenv "GNUTLS_GUILE_CROSS_COMPILING")
+    (set! protocol/ssl-3          protocol/ssl3)
+    (set! protocol/tls-1.0        protocol/tls1-0)
+    (set! protocol/tls-1.1        protocol/tls1-1)
+    (set! credentials/anonymous   credentials/anon)
+    (set! cipher/rijndael-256-cbc cipher/aes-256-cbc)
+    (set! cipher/rijndael-128-cbc cipher/aes-128-cbc)
+    (set! cipher/rijndael-cbc     cipher/aes-128-cbc)
+    (set! cipher/arcfour-128      cipher/arcfour)
+    (set! certificate-verify/allow-any-x509-v1-ca-certificate
+      certificate-verify/allow-any-x509-v1-ca-crt)
+    (set! certificate-verify/allow-x509-v1-ca-certificate
+      certificate-verify/allow-x509-v1-ca-crt)))
 
 ;; Deprecated OpenPGP bindings.
 (define-deprecated certificate-type/openpgp)
```

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