From 3b60b225b3c82330efe002cdb8b5fb4cfd973906 Mon Sep 17 00:00:00 2001
From: tersec <tersec@users.noreply.github.com>
Date: Thu, 12 Jan 2023 14:47:33 +0000
Subject: [PATCH] reduce intermittent Windows GitHub Actions CI build failures
 (#4495)

---
 .github/workflows/ci.yml | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index db081c08f..bf0c000f4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -121,7 +121,10 @@ jobs:
             ncpu=$(sysctl -n hw.ncpu)
             ;;
           'Windows')
-            ncpu=${NUMBER_OF_PROCESSORS}
+            # otherwise, intermittent CI build failures
+            # e.g., cc1.exe: out of memory allocating 215528 bytes
+            # underflow corrected later
+            ncpu=$((${NUMBER_OF_PROCESSORS} - 1))
             make_cmd="mingw32-make"
             ;;
           esac