https://sourceware.org/bugzilla/show_bug.cgi?id=30722
Sam James <sam at gentoo dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |hjl.tools at gmail dot com
--- Comment #9 from Sam James <sam at gentoo dot org> ---
Thanks Nick!
I'm going to dig a bit more to make sure I'm happy with the reason for the 2nd
patch.
Digging in a bit:
```
$ readelf /lib64/libc.so.6 -n # <-- glibc-2.37 with workaround in place
(disabling ISA stuff), built with -march=native on znver2
Displaying notes found in: .note.gnu.property
Owner Data size Description
GNU 0x00000020 NT_GNU_PROPERTY_TYPE_0
Properties: x86 feature used: x86, x87, XMM, YMM, ZMM, MASK
x86 ISA used: x86-64-baseline, x86-64-v2, x86-64-v3, x86-64-v4
Displaying notes found in: .note.ABI-tag
Owner Data size Description
GNU 0x00000010 NT_GNU_ABI_TAG (ABI version tag)
OS: Linux, ABI: 3.2.0
```
```
$ cat dump.out # <-- for property-3 with non-ISAified glibc
Displaying notes found in: .note.gnu.property
Owner Data size Description
GNU 0x00000040 NT_GNU_PROPERTY_TYPE_0
Properties: stack size: 0x800000
x86 ISA needed: x86-64-baseline, x86-64-v2
x86 feature used: x86
x86 ISA used: x86-64-v2, x86-64-v4
Displaying notes found in: .note.ABI-tag
Owner Data size Description
GNU 0x00000010 NT_GNU_ABI_TAG (ABI version tag)
OS: Linux, ABI: 3.2.0
```
```
$ readelf /lib64/libc.so.6 -n # <-- glibc-2.37 with ISA workarounds removed,
built with -march=native on znver2
Displaying notes found in: .note.gnu.property
Owner Data size Description
GNU 0x00000030 NT_GNU_PROPERTY_TYPE_0
Properties: x86 ISA needed: x86-64-baseline, x86-64-v2, x86-64-v3
x86 feature used: x86, x87, XMM, YMM, ZMM, MASK
x86 ISA used: x86-64-baseline, x86-64-v2, x86-64-v3, x86-64-v4
Displaying notes found in: .note.ABI-tag
Owner Data size Description
GNU 0x00000010 NT_GNU_ABI_TAG (ABI version tag)
OS: Linux, ABI: 3.2.0
```
```
$ cat dump.out # <-- for property-3 with ISAified glibc
Displaying notes found in: .note.gnu.property
Owner Data size Description
GNU 0x00000040 NT_GNU_PROPERTY_TYPE_0
Properties: stack size: 0x800000
x86 ISA needed: x86-64-baseline, x86-64-v2, x86-64-v3
x86 feature used: x86
x86 ISA used: x86-64-v2, x86-64-v4
Displaying notes found in: .note.ABI-tag
Owner Data size Description
GNU 0x00000010 NT_GNU_ABI_TAG (ABI version tag)
OS: Linux, ABI: 3.2.0
```
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