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From: Guenter Roeck <linux@roeck-us.net>
To: linux-kernel@vger.kernel.org
Cc: Rik van Riel <riel@surriel.com>, Mike Galbraith <efault@gmx.de>,
	Dave Hansen <dave.hansen@intel.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Andrew Morton <akpm@linux-foundation.org>
Subject: Build failures with gcc 4.5 and older
Date: Tue, 14 Aug 2018 10:09:04 -0700	[thread overview]
Message-ID: <20180814170904.GA12768@roeck-us.net> (raw)

Hi,

Since commit c1a2f7f0c0645 ("mm: Allocate the mm_cpumask
(mm->cpu_bitmap[]) dynamically based on nr_cpu_ids"), building
the Linux kernel with gcc version 4.5 and older fails as follows.

In file included from ./include/linux/mm.h:17:0,
                 from ./include/linux/pid_namespace.h:7,
		 from ./include/linux/ptrace.h:10,
		 from arch/openrisc/kernel/asm-offsets.c:32:
./include/linux/mm_types.h:497:16: error: flexible array member in otherwise empty struct

This is just an example with gcc 4.5.1 for or32. I have seen the problem
with gcc 4.4 (for unicore32) as well.

Does that mean that gcc 4.5 and older are now officially no longer
supported for compiling the kernel ?

If so, would it make sense to update include/linux/compiler-gcc.h
accordingly ?

Thanks,
Guenter

             reply	other threads:[~2018-08-14 17:09 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-14 17:09 Guenter Roeck [this message]
2018-08-14 17:20 ` Build failures with gcc 4.5 and older Linus Torvalds
2018-08-14 17:36   ` Guenter Roeck
2018-08-14 20:19     ` Tony Luck
2018-08-15 16:09       ` Tony Luck
2018-08-15 16:34         ` Linus Torvalds
2018-08-16  0:27           ` Guenter Roeck
2018-08-15 16:49         ` Guenter Roeck
2018-08-14 17:48 ` Joe Perches
2018-08-19 21:23   ` Kees Cook
2018-08-20 17:46   ` Nick Desaulniers
2018-08-20 18:34     ` Linus Torvalds
2018-08-14 21:36 ` Andrew Morton
2018-08-14 22:15   ` Guenter Roeck
2018-08-14 23:02     ` Andrew Morton
2018-08-14 23:20       ` Linus Torvalds
2018-08-15  1:02         ` Guenter Roeck
2018-08-20 14:53           ` Thomas Gleixner
2018-08-20 16:00             ` Arnd Bergmann
2018-08-15 12:40 ` David Laight
2018-08-15 15:44   ` Linus Torvalds
2018-08-15 16:18     ` David Laight
2018-08-15 16:33       ` Linus Torvalds
2018-08-16  9:17         ` David Laight

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