[bug#52117] [PATCH 2/6] build: julia-build-system: Correctly disable parallel tests.

[zimoun <zimon.toutoune@gmail.com>]

Even providing '--procs=1' launches 2 workers which breaks some testsuite of
packages; therefore set '#:parallel-tests?' to '#false' was ineffective.

* guix/build/julia-build-system.scm (check): Fix unexpected behaviour from
'julia' command line option.
---
 guix/build/julia-build-system.scm | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/guix/build/julia-build-system.scm b/guix/build/julia-build-system.scm
index f0dc419c17..af478fd4a3 100644
--- a/guix/build/julia-build-system.scm
+++ b/guix/build/julia-build-system.scm
@@ -112,7 +112,10 @@ (define* (check #:key tests? source inputs outputs julia-package-name
            (builddir (string-append out "/share/julia/"))
            (jobs (if parallel-tests?
                      (number->string (parallel-job-count))
-                     "1")))
+                     "1"))
+           (nprocs (if parallel-tests?
+                       (string-append "--procs=" jobs)
+                       "")))
       ;; With a patch, SOURCE_DATE_EPOCH is honored
       (setenv "SOURCE_DATE_EPOCH" "1")
       (setenv "JULIA_DEPOT_PATH" builddir)
@@ -122,8 +125,7 @@ (define* (check #:key tests? source inputs outputs julia-package-name
                                  "")))
       (setenv "JULIA_CPU_THREADS" jobs)
       (setenv "HOME" "/tmp")
-      (invoke "julia" "--depwarn=yes"
-              (string-append "--procs=" jobs)
+      (invoke "julia" "--depwarn=yes" nprocs
               (string-append builddir "loadpath/"
                              package "/test/runtests.jl"))))
   #t)
-- 
2.32.0