linux/tools
Masahiro Yamada 6f0fa58e45 kbuild: simplify silent build (-s) detection
This allows to detect -s (--silent) option without checking GNU Make
version.

As commit e36aaea289 ("kbuild: Fix silent builds with make-4")
pointed out, GNU Make 4.x changed the way/order it presents the
command line options into MAKEFLAGS.

In Make 3.8x, 's' is always the first in a group of short options.
The group may be prefixed with '-' in some cases.

In Make 4.x, 's' is always the last in a group of short options.

As commit e6ac89fabd ("kbuild: Correctly deal with make options
which contain an 's'") addressed, we also need to deal with long
options that contain 's', like --warn-undefined-variables.

Test cases:

[1] command line input:    make --silent
     -> MAKEFLAGS for Make 3.8x:    s
     -> MAKEFLAGS for Make 4.x :    s

[2] command line input:    make -srR
     -> MAKEFLAGS for Make 3.8x:    sRr
     -> MAKEFLAGS for Make 4.x :    rRs

[3] command line input:    make -s -rR --warn-undefined-variables
     -> MAKEFLAGS for Make 3.8x:    --warn-undefined-variables -sRr
     -> MAKEFLAGS for Make 4.x :    rRs --warn-undefined-variables

My idea to cater to all the cases more easily is to filter out long
options (--%), then search 's' with $(findstring ...).  This way will
be more future-proof even if future versions of Make put 's' in the
middle of the group.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2017-06-06 09:01:12 +09:00
..
accounting tools: move accounting tool from Documentation 2016-09-23 13:07:15 -06:00
arch * ARM: HYP mode stub supports kexec/kdump on 32-bit; improved PMU 2017-05-08 12:37:56 -07:00
build kbuild: simplify silent build (-s) detection 2017-06-06 09:01:12 +09:00
cgroup
firewire
gpio gpio-hammer: fix make consumer_label suitable to work on gpio-nails 2017-01-26 16:29:09 +01:00
hv tools: hv: Add clean up function for Ubuntu config 2017-03-06 17:10:40 -08:00
iio iio: Add channel for Gravity 2017-01-05 13:02:25 +00:00
include Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-05-15 15:50:49 -07:00
kvm/kvm_stat tools/kvm_stat: add '%Total' column 2017-03-29 12:01:33 +02:00
laptop tools: move laptops dslm tool from Documentation 2016-09-23 13:07:21 -06:00
leds tools/leds: Add led_hw_brightness_mon program 2017-02-14 22:20:23 +01:00
lguest Merge branch 'x86-boot-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-05-01 20:51:12 -07:00
lib Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-05-15 15:50:49 -07:00
net tools: bpf_jit_disasm: Add option to dump JIT image to a file. 2017-04-13 13:04:03 -04:00
nfsd
objtool objtool: Drop ARRAY_SIZE() definition, tools/include/linux/kernel.h has it now 2017-04-19 13:01:44 -03:00
pci tools: PCI: Add sample test script to invoke pcitest 2017-04-28 10:23:20 -05:00
pcmcia tools: move pcmcia crc32hash tool from Documentation 2016-09-23 13:07:27 -06:00
perf Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-05-12 10:45:36 -07:00
power tools: power: pm-graph: Package makefile and man pages 2017-04-19 23:26:41 +02:00
scripts kbuild: simplify silent build (-s) detection 2017-06-06 09:01:12 +09:00
spi spi: spidev_test: add option to continuously transfer data 2017-03-21 18:44:40 +00:00
testing This fixes a bug caused by not cleaning up the new instance unique triggers 2017-05-20 23:39:03 -07:00
thermal/tmon
time
usb usb: fix some references for /proc/bus/usb 2017-04-18 16:54:19 +02:00
virtio tools/virtio: fix spelling mistake: "wakeus" -> "wakeups" 2017-05-09 16:43:24 +03:00
vm tools/vm: add missing Makefile rules 2017-02-22 16:41:26 -08:00
Makefile tools/kvm: fix top level makefile 2017-05-03 16:30:25 +02:00