On 02/10/2014 10:41 PM, Robert P. J. Day wrote:
On Mon, 10 Feb 2014, Rick Stevens wrote:
On 02/10/2014 12:09 PM, Robert P. J. Day issued this missive:
grrrrrr ... following the instructions here:
https://fedoraproject.org/wiki/Building_a_custom_kernel
on how to build a custom kernel (some of which is incorrect, more on
that later), and builds keep failing at random places, i'm guessing
because i have a hyperthreaded quad-core laptop, and the "make -j8" is
simply tripping over itself in arbitrary places.
what's the easiest way to specify a single-threaded build? yes, it
will take forever, but it will be nice to verify that that's the
problem.
thanks.
rday
Theoretically you could do
MAKEFLAGS="-j 1" rpmbuild blah-blah
gmake looks for the environment variable "MAKEFLAGS". Most reasonable
makefiles do "MAKEFLAGS+=other-specific-flags", so it should honor it.
Keep in mind that if there are multiple "-j" variables to gmake, it will
only honor the LAST one specified. YMMV.
well, this is interesting ... i found the variable "smp_mflags" in
kernel.spec, so i ran:
$ rpmbuild --showrc
to see how it was being set, and found the following:
-14: _smp_mflags %(
[ -z "$RPM_BUILD_NCPUS" ] \
&& RPM_BUILD_NCPUS="`/usr/bin/nproc 2>/dev/null || \
/usr/bin/getconf _NPROCESSORS_ONLN`"; \
if [ "$RPM_BUILD_NCPUS" -gt 16 ]; then \
echo "-j16"; \
elif [ "$RPM_BUILD_NCPUS" -gt 3 ]; then \
echo "-j$RPM_BUILD_NCPUS"; \
else \
echo "-j3"; \
fi )
which i find fascinating since, if you follow the logic, even if you
use "RPM_BUILD_NCPUS=1", that code above will still set it to 3. :-)
That'd be from your ~/.rpmmacros as set up by rpmdev-setuptree, not from
rpm itself. The rationale is to detect parallel build problems in
package makefiles on non-smp systems so the packager knows to avoid
%{?_smp_mflags} with make in %build.
Note that the kernel build is known to work with parallel build, so the
problems you're seeing are something else, such as subtly faulty
components (cpu/memory/motherboard...) that trip up when pushed hard, or
overheating.
- Panu -
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