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From: Segher Boessenkool <segher@kernel.crashing.org>
To: Alexey Dobriyan <adobriyan@gmail.com>
Cc: akpm@linux-foundation.org, linux-arch@vger.kernel.org,
	Catalin Marinas <catalin.marinas@arm.com>,
	masahiroy@kernel.org, linuxppc-dev@lists.ozlabs.org,
	linux-kernel@vger.kernel.org, Paul Mackerras <paulus@samba.org>,
	Will Deacon <will@kernel.org>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 3/3] isystem: delete global -isystem compile option
Date: Sun, 1 Aug 2021 16:32:47 -0500	[thread overview]
Message-ID: <20210801213247.GM1583@gate.crashing.org> (raw)
In-Reply-To: <20210801201336.2224111-3-adobriyan@gmail.com>

On Sun, Aug 01, 2021 at 11:13:36PM +0300, Alexey Dobriyan wrote:
> In theory, it enables "leakage" of userspace headers into kernel which
> may present licensing problem.

> -NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
> +NOSTDINC_FLAGS += -nostdinc

This is removing the compiler's own include files.  These are required
for all kinds of basic features, and required to be compliant to the C
standard at all.  These are not "userspace headers", that is what
-nostdinc takes care of already.

In the case of GCC all these headers are GPL-with-runtime-exception, so
claiming this can cause licensing problems is fearmongering.

I strongly advise against doing this.


Segher

  reply	other threads:[~2021-08-01 21:40 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-01 20:13 [PATCH 1/3] isystem: trim/fixup stdarg.h and other headers Alexey Dobriyan
2021-08-01 20:13 ` [PATCH 2/3] isystem: ship and use stdarg.h Alexey Dobriyan
2021-08-03  7:14   ` Ard Biesheuvel
2021-08-17  1:30     ` Masahiro Yamada
2021-08-06 13:00   ` Rafael J. Wysocki
2021-08-01 20:13 ` [PATCH 3/3] isystem: delete global -isystem compile option Alexey Dobriyan
2021-08-01 21:32   ` Segher Boessenkool [this message]
2021-08-02  6:42     ` Alexey Dobriyan
2021-08-02 16:47       ` Segher Boessenkool
2021-08-02 20:30         ` Alexey Dobriyan
2021-08-02 21:42           ` Segher Boessenkool
2021-08-02  1:30   ` kernel test robot
2021-08-02 18:18   ` Nathan Chancellor
2021-08-02 20:32     ` Alexey Dobriyan
2021-08-02 20:38       ` Nathan Chancellor
2021-08-02  0:21 ` [PATCH 1/3] isystem: trim/fixup stdarg.h and other headers kernel test robot

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