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2018 Aug 14
3
GCC 5 and -Wstrict-aliasing in JSON.h
...ion, why not simply take the union member of
the appropriate type?
I don't think that GCC would produce this warning unnecessarily. You
are in dangerous waters.
--
Andrew Haley
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
EAC8 43EB D3EF DB98 CC77 2FAD A5CD 6035 332F A671
2018 Aug 10
4
GCC 5 and -Wstrict-aliasing in JSON.h
在 2018-08-10 06:20, Kim Gräsman 写道:
> On Fri, Aug 10, 2018 at 12:02 AM, Jonathan Wakely <jwakely.gcc at gmail.com>
> wrote:
>>
>> If GCC 4.9.3 thinks there's an aliasing violation it might
>> misoptimise. It doesn't matter if it's right or not, it matters if it
>> treats the code as undefined or not.
>>
>> And apparently GCC does think
2018 Aug 10
2
GCC 5 and -Wstrict-aliasing in JSON.h
...t
> stored in the memory at that address was stored as the union type.
>
> Do not lie to the compiler or it will get its revenge.
>
> --
> Andrew Haley
> Java Platform Lead Engineer
> Red Hat UK Ltd. <https://www.redhat.com>
> EAC8 43EB D3EF DB98 CC77 2FAD A5CD 6035 332F A671
>
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2018 Aug 12
4
GCC 5 and -Wstrict-aliasing in JSON.h
I did some more extensive testing and found that all GCCs older than 7
trigger the warning, but only if CMAKE_BUILD_TYPE=Release (which I
guess indicates optimizations are enabled).
There's a patch up for disabling the warning here:
https://reviews.llvm.org/D50607.
I still feel a little uncomfortable, because I think Jonathan makes an
excellent point -- if GCC thinks there's a
2018 Jan 22
3
What does this mean? select(1, [0], , NULL, {60, 0}) = 0 (Timeout)
...,
943902})
10137 00:55:41 read(0, "\374\17\0\7", 4) = 4
10137 00:55:41 select(1, [0], [], NULL, {60, 0}) = 1 (in [0], left {59,
999997})
10137 00:55:41 read(0,
"\25\\\223R\233\263\355wW\23\203;4\212\214\331>\212\251\333=e\237\"\307r
\313\34\273M\275Y\10\242\367\273\7\2679P\332F\312q\240eL)\356\204\17\203
k\375}\306\331\256\357\20B\326kP\236\240\10\222c\303\261k\7\220\2040\26l
6X\343\2\234i\275\244\243\300\222\302\177\245(fN\270\323\376\331Y"...,
4092) = 4092
10137 00:55:41 select(1, [0], [], NULL, {60, 0}) = 1 (in [0], left {59,
990075})
10137 00:55:41 read(0, &quo...
2018 Jan 22
0
What does this mean? select(1, [0], , NULL, {60, 0}) = 0 (Timeout)
...1 read(0, "\374\17\0\7", 4) = 4
> 10137 00:55:41 select(1, [0], [], NULL, {60, 0}) = 1 (in [0], left {59,
> 999997})
> 10137 00:55:41 read(0,
> "\25\\\223R\233\263\355wW\23\203;4\212\214\331>\212\251\333=e\237\"\307r
> \313\34\273M\275Y\10\242\367\273\7\2679P\332F\312q\240eL)\356\204\17\203
> k\375}\306\331\256\357\20B\326kP\236\240\10\222c\303\261k\7\220\2040\26l
> 6X\343\2\234i\275\244\243\300\222\302\177\245(fN\270\323\376\331Y"...,
> 4092) = 4092
> 10137 00:55:41 select(1, [0], [], NULL, {60, 0}) = 1 (in [0], left {59,
> 990075})
&g...
2016 Nov 21
2
Winbind traffic not encrypted
....
0x0660: 5c43 f09b b347 556d ad85 35c1 07b9 55a6 \C...GUm..5...U.
0x0670: b55f 20ae b2b7 3a8a 6afc 89e3 5516 35c9 ._....:.j...U.5.
0x0680: 9303 7389 f539 0776 ee6f 4eb2 d1df aad8 ..s..9.v.oN.....
0x0690: 35bc 5b18 cbfd be8a 78b6 a559 f6ea 7455 5.[.....x..Y..tU
0x06a0: 332f cb63 f205 30fa a6c4 3226 59da 557e 3/.c..0...2&Y.U~
0x06b0: df7c 5441 3890 8164 a7a5 aee0 3213 e439 .|TA8..d....2..9
0x06c0: c00f 723c 2118 c27c 9570 9a4b 824f 1a58 ..r<!..|.p.K.O.X
0x06d0: 3f14 7159 ccb3 d89a 1aee db5b 3fd2 f68a ?.qY.......[?...
0x06e0: 2b79 82a9 4be...