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The zicsr feature has been split off from the base ISA. A newer
binutils version is required to recognize it.
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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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The old version was renamed to
`expat-2.2.6-RENAMED-VULNERABLE-PLEASE-USE-2.3.0-INSTEAD`. :)
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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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