version bump with snapshot support and add tools/toolchain/* to ignore

[joneqdaniel]

• Use gcc mirror with snapshots and get latest version from index.html
• Update all other packages versions to latest working release.
• Add permissions to decompress flags
• Add xz to install workflow

Related

• newlib-4.6.0.20260123/libgloss/mips/hal/crt0.S:92: Error: invalid operands `mtc0 $0,C0_CAUSE #850
• GCC-15.2.0 internal compiler error #709
• build toolchain workflow is missing XZ compression support #855

[sp1187]

FYI, it is planned to replace newlib with picolibc in the near future, therefore newlib should probably not be updated further.

Also I don't see the need of using the latest snapshot version of GCC, not sure what new features is critically important for libdragon development and it could also be a maintenance nightmare as there will be many more different toolchain configurations installed in the wild each with different behaviors and bugs etc.

[grawlinson]

FYI, it is planned to replace newlib with picolibc in the near future, therefore newlib should probably not be updated further.

Sorry to bump in, but is this documented anywhere?

[sp1187]

FYI, it is planned to replace newlib with picolibc in the near future, therefore newlib should probably not be updated further.

Sorry to bump in, but is this documented anywhere?

I guess there is not much public documentation up at the moment, but there is a pull request #535 and the subject has been discussed regularly on the N64brew Discord.