Hi, I have seen this VAR used in some kernel module which also forbid ftrace. but I was curious about whenever I echo $(KBUILD_CFLAGS), it's always empty. all: @echo $(KBUILD_CFLAGS) $(MAKE) -C /path-of-kernel/ M=$(PWD) modules The modification of the option did works, but in the scope of the deferred truly building out-of-tree modules process, the VAR's value seems gone. Thanks for your time. Raphael > ----------original > sender: linux-kbuild-owner@xxxxxxxxxxxxxxx > [mailto:linux-kbuild-owner@xxxxxxxxxxxxxxx] on behave Michal Marek > On: 2015-08-20 16:58 > receiver: Raphael Wu > cc: daniel.baluta@xxxxxxxxx; linux-kbuild@xxxxxxxxxxxxxxx; > octavian.purdila@xxxxxxxxx; bogdan.m.davidoaia@xxxxxxxxx > Title: Re: how to echo $(KBUILD_CFLAGS) > > On 2015-08-20 04:03, RaphaelWu@xxxxxxxxxxxxxx wrote: > > Hi, > > Recently I wrote a test module, within my module I need remove > > -pg flag which is defined by host Makefile (which enable -pg, ftrace function). > > I used a trick in my module makefile KBUILD_CFLAGS := $(subst > > -pg,,$(KBUILD_CFLAGS)), > > You are probably looking for CLFAGS_REMOVE_<file.o>. > > Michal > -- The information transmitted in this e-mail is intended only for the addressee and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of this information by persons or entities other than the intended recipient is prohibited. If you received this e-mail in error, please notify the sender immediately, and delete this e-mail and any attachments. Thank you. -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
