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binutils 2.40 is required by LLVM 19, as older versions do not
know about the zmmull extension.
I've had to backport some patches to glibc and gcc as well,
as they don't build with binutils 2.40. Alternatively, we could
also switch to glibc 2.35 and gcc 12 (I think). I figured we'd
want to avoid the glibc version change, but if that's fine for
riscv I can go with that instead.
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Build the profiler runtime to allow using -C profile-generate
and -C instrument-coverage on riscv64-linux.
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
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This is implementing the MCP from rust-lang/compiler-team#493. It is
increasing the minimum requirements of a couple Tier 1 targets, and
others at lower tiers, so this should go through FCP sign-offs for both
`T-compiler` and `T-release`.
The new `linux-gnu` baseline is kernel 3.2 and glibc 2.17. We will also
take that kernel as the minimum floor for _all_ `*-linux-*` targets, so
it may be broadly assumed in the implementation of the standard library.
That does not preclude specific targets from having greater requirements
where it makes sense, like a new arch needing something newer, or a
platform like `linux-android` choosing a newer baseline.
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LLVM requires CMake 3.13.4, which is only available as of Ubuntu 20.04.
On images using an older version, build it manually.
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