From: PHO <pho@cielonegro.org>
Date: Thu, 23 Feb 2012 14:11:15 +0000 (+0900)
Subject: Better way to detect the number of CPUs.
X-Git-Url: http://git.cielonegro.org/gitweb.cgi?p=build-hc-pkg.git;a=commitdiff_plain;h=c733c44f3636fccd086bcbef8b3bc81602a8fa49

Better way to detect the number of CPUs.
---

diff --git a/build-hc-pkg b/build-hc-pkg
index 14ef15e..e0e55f5 100755
--- a/build-hc-pkg
+++ b/build-hc-pkg
@@ -12,21 +12,11 @@ function detect_platform_type () {
 }
 
 function detect_number_of_cpus () {
-    local -r platform=$(detect_platform_type)
-
-    case "$platform" in
-        *-*-darwin*)
-            ioreg -r -c IOCPU | fgrep -c \"IOCPUNumber\"
-            ;;
-        *-*-netbsd*)
-            cat /proc/cpuinfo | grep -cE 'processor[[:space:]]*:'
-            ;;
-        *)
-            echo "WARNING: I don't know how to detect the number of processors on this platform." >&2
-            echo "WARNING: GHC will be built using only 1 processor. Expect some slowdown." >&2
-            echo 1
-            ;;
-    esac
+    if ! sysctl -n hw.ncpu; then
+        echo "WARNING: I don't know how to detect the number of processors on this platform." >&2
+        echo "WARNING: GHC will be built using only 1 processor. Expect some slowdown." >&2
+        echo 1
+    fi
 }
 
 function detect_gnu_tar () {