build: Auto-compile tests.

With this change, tests run in 46s instead of 230s on my x86_64 laptop
when using ‘guix build -f guix.scm’.

* build-aux/guile.am (.scm.go): Set GUILE_AUTO_COMPILE=0.
* Makefile.am (TESTS_GOBJECTS, DISTCLEANFILES): New variables.
(CLEANFILES): Add $(TESTS_GOBJECTS).
(%.scm.go: %.go): New rule.
* guix.scm (guile-fibers)[arguments]: Remove.

Makefile.am

@@ -130,6 +130,19 @@ TESTS += \
 	tests/concurrent-web-server.scm
 endif
 
+# Tests are calibrated to be compiled (they're much slower when
+# interpreted) so compile them upfront upon 'make check'.
+#
+# Note: Guile looks for tests/*.scm.go, not tests/*.go, hence the file
+# extension weirdness below.
+TESTS_GOBJECTS = $(TESTS:%.scm=%.scm.go)
+CLEANFILES += $(TESTS_GOBJECTS)
+DISTCLEANFILES = $(TESTS_GOBJECTS)
+check-local: $(TESTS_GOBJECTS)
+
+%.scm.go: %.go
+	mv "$^" "$@"
+
 TESTS_ENVIRONMENT=top_srcdir="$(abs_top_srcdir)" ./env $(GUILE) -s
 
 EXTRA_DIST += \

build-aux/guile.am

@@ -23,6 +23,6 @@ EXTRA_DIST = $(SOURCES) $(NOCOMP_SOURCES)
 GUILE_WARNINGS = -Wunbound-variable -Warity-mismatch -Wformat
 SUFFIXES = .scm .go
 .scm.go:
-	$(AM_V_GEN) $(top_builddir)/env	\
+	$(AM_V_GEN) GUILE_AUTO_COMPILE=0 $(top_builddir)/env		\
 	  $(GUILE_TOOLS) compile $(GUILE_TARGET) -L "$(abs_top_srcdir)"	\
 	  $(GUILE_WARNINGS) -o "$@" "$<"

guix.scm

@@ -45,14 +45,6 @@
                       "texinfo" "gettext-minimal"))))
     (inputs
      (list (S "guile")))
-    (arguments
-     `(#:phases (modify-phases %standard-phases
-                  (add-before 'configure 'bootstrap
-                    (lambda _
-                      (zero? (system* "./autogen.sh"))))
-                  (add-before 'configure 'setenv
-                    (lambda _
-                      (setenv "GUILE_AUTO_COMPILE" "0"))))))
     (synopsis "Lightweight concurrency facility for Guile")
     (description
      "Fibers is a Guile library that implements a a lightweight concurrency