From 0402eb794ccf0c552ac776039b2b6f78e10285ad Mon Sep 17 00:00:00 2001
From: Ian Butterworth <i.r.butterworth@gmail.com>
Date: Fri, 10 Feb 2023 07:18:50 -0500
Subject: [PATCH] force singlethreading during precompilation (#48592)

(cherry picked from commit c0d2c574d44231dba39f90d6a6b27448f71763ca)
---
 base/loading.jl | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/base/loading.jl b/base/loading.jl
index 0ab3f5474904f6..55cace21764f89 100644
--- a/base/loading.jl
+++ b/base/loading.jl
@@ -2053,7 +2053,8 @@ function create_expr_cache(pkg::PkgId, input::String, output::String, output_o::
                               --color=$(have_color === nothing ? "auto" : have_color ? "yes" : "no")
                               $trace
                               -`,
-                              "OPENBLAS_NUM_THREADS" => 1),
+                              "OPENBLAS_NUM_THREADS" => 1,
+                              "JULIA_NUM_THREADS" => 1),
                        stderr = internal_stderr, stdout = internal_stdout),
               "w", stdout)
     # write data over stdin to avoid the (unlikely) case of exceeding max command line size