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Dana Jansens
9d5575c920
The Ubuntu 24 builders have a newer GLIBC than is present on the compiler-explorer machines: https://github.com/compiler-explorer/compiler-explorer/issues/7636#issuecomment-2880962252. This results in the following error when running Carbon nightly: ``` /opt/compiler-explorer/carbon-trunk/bin/carbon: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.38' not found (required by /opt/compiler-explorer/carbon-trunk/bin/carbon) ``` To resolve this, we need to build Carbon in a sysroot with a compatible glibc version, and the most straightforward way to do that is to bump our builders back down to Ubuntu 22. To do that, we can't use apt.llvm.org again, since Ubuntu 22 is no longer supported there. So we revert back to pulling a Linux X64 tarball from the LLVM GitHub Releases page. Instead of getting an ubuntu-specific tarball (which does not exist), we grab the generic Linux one, which seems to work fine. Note that the binaries in the LLVM release package appear to depend on glibc version 2.34, as determined by `objdump -T bin/clang|grep GLIBC_| sed 's/.*GLIBC_\([.0-9]*\).*/\1/g' | sort -Vu`, so these binaries should hopefully be okay to package with the Carbon toolchain for the compiler-explorer machines as well.