On Mon, Dec 05, 2022 at 04:48:19PM -0500 Dmitry Goncharov wrote: > Port silent mode detection to the future (post make-4.4) versions of gnu make. > > Makefile contains the following piece of make code to detect if option -s is > specified on the command line. > > ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) > > > This code is executed by make at parse time and assumes that MAKEFLAGS > does not contain command line variable definitions. > Currently if the user defines a=s on the command line, then at build only > time MAKEFLAGS contains " -- a=s". > However, starting with commit dc2d963989b96161472b2cd38cef5d1f4851ea34 > MAKEFLAGS contains command line definitions at both parse time and > build time. > > This '-s' detection code then confuses a command line variable > definition which contains letter 's' with option -s. > > $ # old make > $ make net/wireless/ocb.o a=s > CALL scripts/checksyscalls.sh > DESCEND objtool > $ # this a new make which defines makeflags at parse time > $ ~/src/gmake/make/l64/make net/wireless/ocb.o a=s > $ > > We can see here that the letter 's' from 'a=s' was confused with -s. > > This patch checks for presence of -s using a method recommended by the > make manual here > https://www.gnu.org/software/make/manual/make.html#Testing-Flags. > > > Signed-off-by: Dmitry Goncharov <dgoncharov@xxxxxxxxxxxx> > Reported-by: Jan Palus <jpalus+gnu@xxxxxxxxxxxx> > Link: https://lists.gnu.org/archive/html/bug-make/2022-11/msg00190.html > > diff --git a/Makefile b/Makefile > index 6f846b1f2618..fbd9ff4a61e7 100644 > --- a/Makefile > +++ b/Makefile > @@ -93,10 +93,17 @@ endif > > # If the user is running make -s (silent mode), suppress echoing of > # commands > +# make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS. > > -ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) > - quiet=silent_ > - KBUILD_VERBOSE = 0 > +ifeq ($(filter 3.%,$(MAKE_VERSION)),) > +silence:=$(findstring s,$(firstword -$(MAKEFLAGS))) > +else > +silence:=$(findstring s,$(filter-out --%,$(MAKEFLAGS))) > +endif > + > +ifeq ($(silence),s) > +quiet=silent_ > +KBUILD_VERBOSE = 0 Thanks for that patch. Following its development was quite interesting! Are there some (possibly unwritten) style recommendations for Linux Makefiles/Kbuilds, e.g. regarding spaces around assignment operators and after commas? Personally, I would have liked to see those spaces here as I think it would be better for style consistency. Kind regards, Nicolas -- epost|xmpp: nicolas@xxxxxxxxx irc://oftc.net/nsc ↳ gpg: 18ed 52db e34f 860e e9fb c82b 7d97 0932 55a0 ce7f -- frykten for herren er opphav til kunnskap --
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