Added support for parallel builds

With this patch, one can define the degree of build parallelism via a 'jobs'
rpm variable. A comfortable way to use this is having a ~/.rpmmacros file with
a line like:

   %jobs 2

Alternatively, one could use a '--define "jobs 2"' command line flag for
rpmbuild. On a Core 2 Duo using 2 jobs brings down the time for a full build
including extralibs from 36m to 27m. If 'jobs' is not defined, a normal
sequential build is done, following the usual conventions on e.g. openSUSE.

diff --git a/ghc.spec.in b/ghc.spec.in
index a03a759..c50e805 100644 (file)
--- a/ghc.spec.in
+++ b/ghc.spec.in
@@ -83,7 +83,7 @@ needed.
 %build
 test -f configure || autoreconf
 ./configure --prefix=%{_prefix} --mandir=%{_mandir}
-make HTML_DIR_INSTALLED=%{_defaultdocdir}/%{name}/libraries/'$(PACKAGE)'
+make %{?jobs:-j%jobs} HTML_DIR_INSTALLED=%{_defaultdocdir}/%{name}/libraries/'$(PACKAGE)'
 make html
 make -C docs/ext-core ps
 make -C docs/storage-mgt ps