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authorLudovic Courtès <ludo@gnu.org>2013-03-16 17:22:20 +0100
committerLudovic Courtès <ludo@gnu.org>2013-03-16 17:23:17 +0100
commit0bb1aa9e05bd103a71378307b7e26e22fea5ebab (patch)
treec7d7d66ad34a6e7ebdf463096583ba2c6540db99
parentd80855999a81f344ca0c994f0532f5bd45162089 (diff)
downloadguix-0bb1aa9e05bd103a71378307b7e26e22fea5ebab.tar
guix-0bb1aa9e05bd103a71378307b7e26e22fea5ebab.tar.gz
derivations: Optimize `build-expression->derivation'.
This reduces the execution time of "guix build -e '(@ (gnu packages emacs) emacs)' -d" by 6%, from 1.15s to 1.08s. * guix/derivations.scm (build-expression->derivation): Write the builder as UTF-8.
-rw-r--r--guix/derivations.scm23
1 files changed, 15 insertions, 8 deletions
diff --git a/guix/derivations.scm b/guix/derivations.scm
index d70bd9dd85..2243d2ba46 100644
--- a/guix/derivations.scm
+++ b/guix/derivations.scm
@@ -741,14 +741,21 @@ omitted or is #f, the value of the `%guile-for-build' fluid is used instead."
(unsetenv "LD_LIBRARY_PATH")))
(builder (add-text-to-store store
(string-append name "-guile-builder")
- (string-append
- (object->string prologue)
- (object->string
- `(exit
- ,(match exp
- ((_ ...)
- (remove module-form? exp))
- (_ `(,exp))))))
+
+ ;; Explicitly use UTF-8 for determinism,
+ ;; and also because UTF-8 output is faster.
+ (with-fluids ((%default-port-encoding
+ "UTF-8"))
+ (call-with-output-string
+ (lambda (port)
+ (write prologue port)
+ (write
+ `(exit
+ ,(match exp
+ ((_ ...)
+ (remove module-form? exp))
+ (_ `(,exp))))
+ port))))
;; The references don't really matter
;; since the builder is always used in