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roms/edk2-funcs.sh: add the qemu_edk2_get_thread_count() function

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The edk2 "build" utility natively supports building modules (that is, INF
files) in parallel. The feature is not useful when building a single
module (with the "-m" option), but it is useful for platform firmware
builds (which include many modules). Add a function that determines the
"-n" option argument for "build", from the MAKEFLAGS variable (i.e. based
on the presence of a make job server).

Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Philippe Mathieu-Daud <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daud <philmd@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
This commit is contained in:
Laszlo Ersek 2019-03-07 13:15:20 +01:00
parent b9a4c15164
commit fd75d2c2ee
1 changed files with 25 additions and 0 deletions
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roms/edk2-funcs.sh
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@ -226,3 +226,28 @@ qemu_edk2_set_cross_env()
eval "export $cross_prefix_var=\$cross_prefix"
}
# Determine the "-n" option argument (that is, the number of modules to build
# in parallel) for the edk2 "build" utility. Print the result to the standard
# output.
#
# Parameters:
# $1: the value of the MAKEFLAGS variable
qemu_edk2_get_thread_count()
{
local makeflags="$1"
if [[ "$makeflags" == *--jobserver-auth=* ]] ||
[[ "$makeflags" == *--jobserver-fds=* ]]; then
# If there is a job server, allow the edk2 "build" utility to parallelize
# as many module builds as there are logical CPUs in the system. The "make"
# instances forked by "build" are supposed to limit themselves through the
# job server. The zero value below causes the edk2 "build" utility to fetch
# the logical CPU count with Python's multiprocessing.cpu_count() method.
printf '0\n'
else
# Build a single module at a time.
printf '1\n'
fi
}