Building master on gentoo: QA Warnings

[CaptainBloodz]

Zig Version

0.12.0-dev.1840+d787b78d2

Steps to Reproduce and Observed Behavior

 * QA Notice: Package triggers severe warnings which indicate that it
 *            may exhibit random runtime failures.
 * /var/no-tmpfs/portage/dev-lang/zig-9999/work/zig-9999/build/zig2.c:3378343: warning: assignment to 'const uint16_t (*)[16]' {aka 'const short unsigned int (*)[16]'} from incompatible pointer type 'const uint16_t *' {aka 'const short unsigned int *'} [-Wincompatible-pointer-types]
 * /var/no-tmpfs/portage/dev-lang/zig-9999/work/zig-9999/build/zig2.c:1493587: warning: 'memcpy' reading 16 bytes from a region of size 10 [-Wstringop-overread]
 * /var/no-tmpfs/portage/dev-lang/zig-9999/work/zig-9999/build/zig2.c:2744871: warning: 'memcpy' reading 16 bytes from a region of size 10 [-Wstringop-overread]
 * /var/no-tmpfs/portage/dev-lang/zig-9999/work/zig-9999/build/zig2.c:2744945: warning: 'memcpy' reading 16 bytes from a region of size 10 [-Wstringop-overread]

 * Please do not file a Gentoo bug and instead report the above QA
 * issues directly to the upstream developers of this software.
 * Homepage: https://ziglang.org/

My apologizes if totally meaningless.

Expected Behavior

No QA warnings reported

[BratishkaErik]

Safe to ignore: this is an effect of #17802
and will disappear when or if the bootstrap seed is updated.

Except first warning incompatible-pointer-types, which is part of modern C porting efforts, IMHO this one can be considered a bug in C backend [if it would not disappear after seed updating], since it would become an error in future C mainstream compilers (GCC and Clang) releases.

https://inbox.sourceware.org/gcc-patches/cover.1700473918.git.fweimer@redhat.com/

[CaptainBloodz]

QA Warnings remain here:

amd64 ~ # zig version
0.12.0-dev.1849+bb0f7d55e

amd64 ~ # gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/13/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /var/no-tmpfs/portage/sys-devel/gcc-13.2.1_p20231216/work/gcc-13-20231216/configure --host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr --bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/13 --includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/13/include --datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/13 --mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/13/man --infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/13/info --with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/13/include/g++-v13 --disable-silent-rules --disable-dependency-tracking --with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/13/python --enable-languages=c,c++,fortran --enable-obsolete --enable-secureplt --disable-werror --with-system-zlib --disable-nls --disable-libunwind-exceptions --enable-checking=release --with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo 13.2.1_p20231216 p11' --with-gcc-major-version-only --enable-libstdcxx-time --enable-lto --disable-libstdcxx-pch --enable-shared --enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu --enable-multilib --with-multilib-list=m32,m64 --disable-fixed-point --enable-targets=all --enable-libgomp --disable-libssp --disable-libada --disable-cet --disable-systemtap --disable-valgrind-annotations --enable-vtable-verify --with-zstd --with-isl --disable-isl-version-check --enable-default-pie --disable-default-ssp --with-build-config=bootstrap-lto
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 13.2.1 20231216 (Gentoo 13.2.1_p20231216 p11)

• QA Notice: Package triggers severe warnings which indicate that it

•        may exhibit random runtime failures.
  

• /var/no-tmpfs/portage/dev-lang/zig-9999/work/zig-9999/build/zig2.c:3379292: warning: assignment to 'const uint16_t ()[16]' {aka 'const short unsigned int ()[16]'} from incompatible pointer type 'const uint16_t *' {aka 'const short unsigned int *'} [-Wincompatible-pointer-types]
• /var/no-tmpfs/portage/dev-lang/zig-9999/work/zig-9999/build/zig2.c:1493823: warning: 'memcpy' reading 16 bytes from a region of size 10 [-Wstringop-overread]
• /var/no-tmpfs/portage/dev-lang/zig-9999/work/zig-9999/build/zig2.c:2745134: warning: 'memcpy' reading 16 bytes from a region of size 10 [-Wstringop-overread]
• /var/no-tmpfs/portage/dev-lang/zig-9999/work/zig-9999/build/zig2.c:2745208: warning: 'memcpy' reading 16 bytes from a region of size 10 [-Wstringop-overread]

[BratishkaErik]

Yes, it's normal, they will be gone after seed is updated. Issue has been resolved, and these concrete warnings don't apply to final binary now.

(btw to disable formatting you can put logs into

```
logs
```

construction)