From 74299c8919cb2e2f6e1678817529e3a730cf6b81 Mon Sep 17 00:00:00 2001
From: Sebastiano Tronto <sebastiano@tronto.net>
Date: Mon, 12 Jan 2026 21:29:39 +0100
Subject: Automatically detect number of threads for unix systems

---
 build.sh | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/build.sh b/build.sh
index 642f5ca..e4da0b7 100755
--- a/build.sh
+++ b/build.sh
@@ -43,10 +43,23 @@ NODE=${NODE-${NISSY_BUILD_NODE:-"node"}}
 # The default value is 16.
 THREADS=${THREADS-${NISSY_BUILD_THREADS}}
 
+portable_nproc() {
+	OS="$(uname -s)"
+	case "$OS" in
+	"Linux")
+		nproc
+		;;
+	"Darwin" | "*BSD")
+		sysctl -n hw.ncpu
+		;;
+	*)
+		echo "32" # A safe, large default
+		;;
+	esac
+}
+
 detectthreads() {
-	# TODO: detect based on system
-	# Is 'getconf NPROCESSORD_ONLN' portable? Is it threads or cores?
-	echo "16"
+	echo "$(portable_nproc)"
 }
 
 [ -z "$THREADS" ] && THREADS="$(detectthreads)"
-- 
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