RE: [PATCH v4 1/2] arm: lib: xor-neon: remove unnecessary GCC < 4.6 warning
From: David Laight <hidden>
Date: 2021-01-19 22:07:31
Also in:
lkml
From: Adrian Ratiu
Sent: 19 January 2021 13:17
To: linux-arm-kernel@lists.infradead.org
Drop warning because kernel now requires GCC >= v4.9 after
commit 6ec4476ac825 ("Raise gcc version requirement to 4.9")
and clarify that -ftree-vectorize now always needs enabling
for GCC by directly testing the presence of CONFIG_CC_IS_GCC....
-#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6) +#ifdef CONFIG_CC_IS_GCC #pragma GCC optimize "tree-vectorize" -#else
I thought that #pragma optimise was very likely to remove a random subset of the command line parameters leading to incorrect/unexpected code. As such the extra option needs to passed in as a per source file compiler option. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales) _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel