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-rw-r--r--build-aux/build-self.scm21
1 files changed, 19 insertions, 2 deletions
diff --git a/build-aux/build-self.scm b/build-aux/build-self.scm
index ed8ff5f4ce..6415978839 100644
--- a/build-aux/build-self.scm
+++ b/build-aux/build-self.scm
@@ -120,13 +120,30 @@ person's version identifier."
;; XXX: Replace with a Git commit id.
(date->string (current-date 0) "~Y~m~d.~H"))
+(define (matching-guile-2.2)
+ "Return a Guile 2.2 with the same version as the current one or immediately
+older than then current one. This is so that we do not build ABI-incompatible
+objects. See <https://bugs.gnu.org/29570>."
+ (let loop ((packages (find-packages-by-name "guile" "2.2"))
+ (best #f))
+ (match packages
+ (()
+ best)
+ ((head tail ...)
+ (if (string=? (package-version head) (version))
+ head
+ (if best
+ (if (version>? (package-version head) (version))
+ (loop tail best)
+ (loop tail head))
+ (loop tail head)))))))
+
(define (guile-for-build)
"Return a derivation for Guile 2.0 or 2.2, whichever matches the currently
running Guile."
(package->derivation (cond-expand
(guile-2.2
- (canonical-package
- (specification->package "guile@2.2")))
+ (canonical-package (matching-guile-2.2)))
(else
(canonical-package
(specification->package "guile@2.0"))))))