linux-kernel - Re: [PATCH] kbuild: llvmlinux: Fix -fno-delete-null-pointer-checks compiler-flag

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Date:	Mon, 26 Oct 2015 21:01:46 +0100
From:	Michal Marek <mmarek@...e.com>
To:	Sedat Dilek <sedat.dilek@...il.com>
Cc:	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kbuild: llvmlinux: Fix -fno-delete-null-pointer-checks
 compiler-flag

Dne 15.9.2015 v 05:03 Sedat Dilek napsal(a):
> CLANG (here: v3.7) does not support '-fno-delete-null-pointer-checks'
> as a compiler-flag.
> 
> Fix the HOSTCFLAGS and KBUILD_CFLAGS settings accordingly.
> Furthermore, move and correct the $HOSTCC check.
> 
> Tested against Linux v4.3-rc1 and a refreshed llvmlinux patchset.
> ---
>  Makefile | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/Makefile b/Makefile
> index aaf1d52bc646..4249441e535d 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -300,9 +300,9 @@ HOSTCXX      = g++
>  HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
>  HOSTCXXFLAGS = -O2
>  
> -ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
> -HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
> -		-Wno-missing-field-initializers -fno-delete-null-pointer-checks
> +HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter -Wno-missing-field-initializers

You are enabling the -Wno-* options for gcc with this.

Michal
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