on s390x 128bit types have a smaller alignment then on x86[^1].
This leads to smaller structs and therefore the write_unaligned will
write outside of the structs boundary.

For now disable the tests on s390x. [^2]

[^1]: s390x ELF ABI Table 1.1, Page 12 https://github.com/IBM/s390x-abi
[^2]: rust-lang#149056 (comment)

…rite, r=RalfJung

fix the fragment_in_dst_padding_gets_overwritten test on s390x

on s390x 128bit types have a smaller alignment then on x86[^1]. This leads to smaller structs (24 instead of 32 bytes) and therefore the write_unaligned will write outside of the structs boundary.

To fix the test, change the trailing u32 into a u8. This will generate 7 trailing padding bytes on s390x and 15 on x86_64. Also change the start of the garbage data so it will span over x,y and padding:

```
s390x:   XXXXXXXXXXXXXXXXY-------
x86_64:  XXXXXXXXXXXXXXXXY---------------
                      GGGGGGGG

```

[^1]: s390x ELF ABI Table 1.1, Page 12 https://github.com/IBM/s390x-abi

Rollup of 7 pull requests

Successful merges:

 - #146341 (minimal dirfd implementation (1/4))
 - #146925 (Add doc for va_list APIs)
 - #147035 (alloc: fix `Debug` implementation of `ExtractIf`)
 - #147173 (Add support for hexagon-unknown-qurt target)
 - #149041 (ignore unsized types in mips64 and sparc64 callconvs)
 - #149056 (fix the fragment_in_dst_padding_gets_overwritten test on s390x)
 - #149095 (rustc-dev-guide subtree update)

r? `@ghost`
`@rustbot` modify labels: rollup

…rite, r=RalfJung

fix the fragment_in_dst_padding_gets_overwritten test on s390x

on s390x 128bit types have a smaller alignment then on x86[^1]. This leads to smaller structs (24 instead of 32 bytes) and therefore the write_unaligned will write outside of the structs boundary.

To fix the test, change the trailing u32 into a u8. This will generate 7 trailing padding bytes on s390x and 15 on x86_64. Also change the start of the garbage data so it will span over x,y and padding:

```
s390x:   XXXXXXXXXXXXXXXXY-------
x86_64:  XXXXXXXXXXXXXXXXY---------------
                      GGGGGGGG

```

[^1]: s390x ELF ABI Table 1.1, Page 12 https://github.com/IBM/s390x-abi

Rollup of 6 pull requests

Successful merges:

 - #146925 (Add doc for va_list APIs)
 - #147035 (alloc: fix `Debug` implementation of `ExtractIf`)
 - #147173 (Add support for hexagon-unknown-qurt target)
 - #149041 (ignore unsized types in mips64 and sparc64 callconvs)
 - #149056 (fix the fragment_in_dst_padding_gets_overwritten test on s390x)
 - #149095 (rustc-dev-guide subtree update)

r? `@ghost`
`@rustbot` modify labels: rollup

…rite, r=RalfJung

fix the fragment_in_dst_padding_gets_overwritten test on s390x

on s390x 128bit types have a smaller alignment then on x86[^1]. This leads to smaller structs (24 instead of 32 bytes) and therefore the write_unaligned will write outside of the structs boundary.

To fix the test, change the trailing u32 into a u8. This will generate 7 trailing padding bytes on s390x and 15 on x86_64. Also change the start of the garbage data so it will span over x,y and padding:

```
s390x:   XXXXXXXXXXXXXXXXY-------
x86_64:  XXXXXXXXXXXXXXXXY---------------
                      GGGGGGGG

```

[^1]: s390x ELF ABI Table 1.1, Page 12 https://github.com/IBM/s390x-abi

Rollup of 9 pull requests

Successful merges:

 - #146925 (Add doc for va_list APIs)
 - #147035 (alloc: fix `Debug` implementation of `ExtractIf`)
 - #147173 (Add support for hexagon-unknown-qurt target)
 - #148261 (rustc_public: Make Id types !Send / !Sync)
 - #149041 (ignore unsized types in mips64 and sparc64 callconvs)
 - #149043 ( rustdoc-json: add rlib path to ExternalCrate to enable robust crate resolution)
 - #149056 (fix the fragment_in_dst_padding_gets_overwritten test on s390x)
 - #149095 (rustc-dev-guide subtree update)
 - #149108 ([AIX][ppc64le-linux-gnu] Add Amy Kwan to target maintainers)

r? `@ghost`
`@rustbot` modify labels: rollup

…rite, r=RalfJung

fix the fragment_in_dst_padding_gets_overwritten test on s390x

on s390x 128bit types have a smaller alignment then on x86[^1]. This leads to smaller structs (24 instead of 32 bytes) and therefore the write_unaligned will write outside of the structs boundary.

To fix the test, change the trailing u32 into a u8. This will generate 7 trailing padding bytes on s390x and 15 on x86_64. Also change the start of the garbage data so it will span over x,y and padding:

```
s390x:   XXXXXXXXXXXXXXXXY-------
x86_64:  XXXXXXXXXXXXXXXXY---------------
                      GGGGGGGG

```

[^1]: s390x ELF ABI Table 1.1, Page 12 https://github.com/IBM/s390x-abi