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Reverts llvm/llvm-project#152748
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This is a follow up to the RFC here:
https://discourse.llvm.org/t/rfc-implementation-of-stdio-on-baremetal/86944
This provides the stdout/stderr/stdin symbols (which now don't have to
provided by the user). This allows the user to have access to all
functions, currently I've only tested `fprintf` but in theory everything
that works in the generic folder should work in the baremetal
configuration.
All streams are _non-buffered_, which does NOT require flushing. It is
based on the CookieFile that already existed
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In #94078, `write_to_stdout` had not been fully implemented. However,
now that it has been implemented, to conform with the C standard
(7.23.6.3. The printf function, specifically point 2), we use `stdout`.
This issue is tracked in #94685.
- Also prefer `static constexpr`
- Made it explicit that we are writing to `stdout`
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This is a part of #97655.
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declaration" (#98593)
Reverts llvm/llvm-project#98075
bots are broken
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This is a part of #97655.
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In #94685 I discussed my ideas for cleaner baremetal output writing.
This patch is not that. This patch just uses `write_to_stderr` for
outputting from putchar and printf on baremetal. I'm still planning to
create a proper design for writing to stdout and stderr on various
platforms, but that will be a followup patch.
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