[libc] remove errno.h includes (#110934)

[libc] Add printf strerror conversion (%m) (#105891)

This patch adds the %m conversion to printf, which prints the
strerror(errno). Explanation of why is below, this patch also updates
the docs, tes

[libc] Add printf strerror conversion (%m) (#105891)

This patch adds the %m conversion to printf, which prints the
strerror(errno). Explanation of why is below, this patch also updates
the docs, tests, and build system to accomodate this.

The standard for syslog in posix specifies it uses the same format as
printf, but adds %m which prints the error message string for the
current value of errno. For ease of implementation, it's standard
practice for libc implementers to just add %m to printf instead of
creating a separate parser for syslog.

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[libc] Migrate to using LIBC_NAMESPACE_DECL for namespace declaration (#98597)

This is a part of #97655.

Revert "[libc] Migrate to using LIBC_NAMESPACE_DECL for namespace declaration" (#98593)

Reverts llvm/llvm-project#98075

bots are broken

[libc] Migrate to using LIBC_NAMESPACE_DECL for namespace declaration (#98075)

This is a part of #97655.

[libc] fix clang-tidy llvm-header-guard warnings (#82679)


Towards the goal of getting `ninja libc-lint` back to green, fix the numerous
instances of:

warning: header guard does not follow pref

[libc] fix clang-tidy llvm-header-guard warnings (#82679)


Towards the goal of getting `ninja libc-lint` back to green, fix the numerous
instances of:

warning: header guard does not follow preferred style [llvm-header-guard]

This is because many of our header guards start with `__LLVM` rather than
`LLVM`.

To filter just these warnings:

$ ninja -k2000 libc-lint 2>&1 | grep llvm-header-guard

To automatically apply fixits:

$ find libc/src libc/include libc/test -name \*.h | \
xargs -n1 -I {} clang-tidy {} -p build/compile_commands.json \
-checks='-*,llvm-header-guard' --fix --quiet

Some manual cleanup is still necessary as headers that were missing header
guards outright will have them inserted before the license block (we prefer
them after).

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[libc] Mass replace enclosing namespace (#67032)

This is step 4 of
https://discourse.llvm.org/t/rfc-customizable-namespace-to-allow-testing-the-libc-when-the-system-libc-is-also-llvms-libc/73079

[libc][clang-tidy] Add llvm-header-guard to get consistant naming and prevent file copy/paste issues. (#66477)

[libc] Fix more inline definitions

Fix a bunch more instances of incorrect use of the `static`
keyword and missing use of LIBC_INLINE and LIBC_INLINE_VAR
macros. Note that even forward declarations

[libc] Fix more inline definitions

Fix a bunch more instances of incorrect use of the `static`
keyword and missing use of LIBC_INLINE and LIBC_INLINE_VAR
macros. Note that even forward declarations and generic template
declarations must follow the prescribed patterns for libc code so
that they match every definition, all template specializations.

Reviewed By: Caslyn

Differential Revision: https://reviews.llvm.org/D154260

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[libc] Rearrange error and signal tables.

This is largely a cosmetic change done with a few goals:
1. Reduce the conditionals in picking the correct set of tables for the
platform.
2. Avoid expos

[libc] Rearrange error and signal tables.

This is largely a cosmetic change done with a few goals:
1. Reduce the conditionals in picking the correct set of tables for the
platform.
2. Avoid exposing, for example Linux errors, when building for non-Linux
platforms. This also prevents build failures when Linux errors are not
defined on the target non-Linux platform.
3. Some "_table" suffixes have been removed to avoid repeated
occurance of "table" like "tables/linux_error_table.h".

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D151367

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