Package: debian-policy Version: 3.6.1.0 Severity: wishlist Hi!
I'd like to propose the option "parallel=X" in DEB_BUILD_OPTIONS to allow packages to build in parallel with X jobs thus enabling faster builds on SMP machines for packages that support this. Just setting "$(MAKE)=make -j3" in the environment won't work because many packages break if built like that. http://lists.debian.org/debian-policy/2001/debian-policy-200103/msg00368.html I could find 4 packages that support 3 different interfaces for accomplishing that. gcc-snapshot and ardour look for "USE_NJOBS" in the environment and the figure out themselves how many jobs to use: ifneq ($(USE_NJOBS),) NJOBS := -j$(shell if [ -f /proc/cpuinfo ]; \ then echo `cat /proc/cpuinfo | grep 'processor' | wc -l`; \ else echo 1; fi) endif openoffice.org does: # Pararell build - add -PPn into DEB_BUILD_OPTIONS, where n is the number of processes glibc does: ifneq (,$(findstring parallel,$(DEB_BUILD_OPTIONS))) DEB_BUILD_OPTION_PARALLEL = yes else DEB_BUILD_OPTION_PARALLEL = no endif I propose the following: --- policy.sgml.orig 2003-09-06 21:58:14.000000000 +0200 +++ policy.sgml 2003-09-06 22:07:04.000000000 +0200 @@ -6325,7 +6325,13 @@ not be stripped from the binary during installation, so that debugging information may be included in the package. </item> </taglist> + <tag>parallel=N</tag> + <item> + This option means that the package should be built with N jobs in + parallel if it can be built in parallel, so that the build process + becomes faster on multiprocessor machines. + </item> </p> <p> @@ -6349,6 +6355,19 @@ ifeq (,$(findstring nostrip,$(DEB_BUILD_OPTIONS))) INSTALL_PROGRAM += -s endif + +ifneq (,$(findstring parallel,$(DEB_BUILD_OPTIONS))) + PARALLEL_JOBS := $(shell echo $(DEB_BUILD_OPTIONS) | \ + sed -e 's/.*parallel=\([0-9]\+\).*/\1/') + ifeq ($(DEB_BUILD_OPTIONS),$(PARALLEL_JOBS)) + PARALLEL_JOBS := $(shell if [ -f /proc/cpuinfo ]; \ + then echo `cat /proc/cpuinfo | grep 'processor' | wc -l`; \ + else echo 1; fi) + endif + NJOBS := -j$(PARALLEL_JOBS) +endif +MAKEFLAGS += $(NJOBS) + </example> </p> thus supporting the glibc's interface and the extension of explicitly setting the number of jobs to be used. Robert. -- System Information: Debian Release: testing/unstable Architecture: i386 Kernel: Linux schuh 2.5.72 #1 SMP Thu Jun 19 12:51:46 UTC 2003 i686 Locale: LANG=C, LC_CTYPE=en_US.UTF-8 -- no debconf information
