linux-kernel - Re: [RFC PATCH 1/2] Makefile: Make HOSTCFLAGS and HOSTCXXFLAGS user modifyable

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Message-ID: <CAPdLdq=ZjoO=Ja=0USF1g_RZKpgebCqttQXat7cmW8KXpsFF7g@mail.gmail.com>
Date:	Fri, 20 Jun 2014 12:35:07 -0700
From:	Markus Mayer <markus.mayer@...aro.org>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Michal Marek <mmarek@...e.cz>,
	Linux Build List <linux-kbuild@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 1/2] Makefile: Make HOSTCFLAGS and HOSTCXXFLAGS user modifyable

On 20 June 2014 11:44, Sam Ravnborg <sam@...nborg.org> wrote:
> On Fri, Jun 20, 2014 at 11:31:28AM -0700, Markus Mayer wrote:
>> In order to allow the user to pass extra arguments to the host
>> compiler, we no longer overwrite the host compiler flags in the
>> makefile, but append them to what was passed in.
>>
>> Signed-off-by: Markus Mayer <markus.mayer@...aro.org>
>> ---
>>  Makefile | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/Makefile b/Makefile
>> index 97b2861..5795eea 100644
>> --- a/Makefile
>> +++ b/Makefile
>> @@ -251,8 +251,8 @@ CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
>>
>>  HOSTCC       = gcc
>>  HOSTCXX      = g++
>> -HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
>> -HOSTCXXFLAGS = -O2
>> +HOSTCFLAGS   += -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
>> +HOSTCXXFLAGS += -O2
>>
>>  ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
>>  HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
>
> With this patch you can only override HOSTCFLAGS.
> In many cases appending to the falgs is actually what you want.
>
> Please take a look at how we have implemented it for the kernel with KCFLAGS.
> And notice that this is also described in Documentation/kbuild

Thanks. I am able to do what I need using HOST_EXTRACFLAGS and HOST_LOADLIBES.

-Markus
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