linux-kernel - Re: Compile problems w/gcc 9.4.0 in linux-next

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Message-ID: <Z90XZqJVwuWkarnX@gmail.com>
Date: Fri, 21 Mar 2025 08:38:14 +0100
From: Ingo Molnar <mingo@...nel.org>
To: Michael Kelley <mhklinux@...look.com>
Cc: Ard Biesheuvel <ardb@...nel.org>, "terrelln@...com" <terrelln@...com>,
	"dsterba@...e.com" <dsterba@...e.com>,
	"brgerst@...il.com" <brgerst@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Compile problems w/gcc 9.4.0 in linux-next


* Michael Kelley <mhklinux@...look.com> wrote:

> > What are your thoughts as maintainers of lib/zstd?
> 
> FYI, the same segfault occurs with gcc 10.5. The problem is fixed
> in gcc 11.4.

So the patch below would work this around on GCC9 and GCC10?

Thanks,

	Ingo

==============>
 lib/zstd/common/portability_macros.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/zstd/common/portability_macros.h b/lib/zstd/common/portability_macros.h
index 0e3b2c0a527d..0dde8bf56595 100644
--- a/lib/zstd/common/portability_macros.h
+++ b/lib/zstd/common/portability_macros.h
@@ -55,7 +55,7 @@
 #ifndef DYNAMIC_BMI2
   #if ((defined(__clang__) && __has_attribute(__target__)) \
       || (defined(__GNUC__) \
-          && (__GNUC__ >= 5 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)))) \
+          && (__GNUC__ >= 11))) \
       && (defined(__x86_64__) || defined(_M_X64)) \
       && !defined(__BMI2__)
   #  define DYNAMIC_BMI2 1