From 91ce5fc3d658e5037ba21952a2c00b17991d5f48 Mon Sep 17 00:00:00 2001
From: Thierry Vignaud <thierry.vignaud@gmail.com>
Date: Sun, 26 Oct 2014 09:28:52 +0100
Subject: add support for limiting parallel builds

(by defining %_smp_ncpus_max in spec file for packages needing it)
---
 NEWS            | 3 +++
 build.macros.in | 5 ++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/NEWS b/NEWS
index 8d7a355..c9f4cb2 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,6 @@
+- add support for limiting parallel builds by defining
+  %_smp_ncpus_max in spec file for packages needing it
+
 Version 2.6 - 14 October 2014, by Pascal Terjan
 
 - support being passed the egg-info directory
diff --git a/build.macros.in b/build.macros.in
index 94bc858..5d2a6fe 100644
--- a/build.macros.in
+++ b/build.macros.in
@@ -207,9 +207,12 @@ GCONF_CONFIG_SOURCE=`%{_gconftool_bin} --get-default-source` %{_gconftool_bin} -
 export CFLAGS="%optflags"; export CXXFLAGS="%optflags"; export RPM_OPT_FLAGS="%optflags" \
 %{nil}
 
-
+# Maximum number of CPU's to use when building, 0 for unlimited.
+%_smp_ncpus_max 0
 %_smp_mflags %([ -z "$RPM_BUILD_NCPUS" ] \\\
 	&& RPM_BUILD_NCPUS="`/usr/bin/getconf _NPROCESSORS_ONLN`"; \\\
+	ncpus_max=%{?_smp_ncpus_max}; \\\
+	if [ -n "$ncpus_max" ] && [ "$ncpus_max" -gt 0 ] && [ "$RPM_BUILD_NCPUS" -gt "$ncpus_max" ]; then RPM_BUILD_NCPUS="$ncpus_max"; fi; \\\
 	[ "$RPM_BUILD_NCPUS" -gt 1 ] && echo "-j$RPM_BUILD_NCPUS")
 
 %_make_bin make
-- 
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