[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] 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] Better IntegerToString API

This patch is an alternative to D155902. It provides the following benefits:
- No buffer manual allocation and error handling for the general case
- More flexible

[libc] Better IntegerToString API

This patch is an alternative to D155902. It provides the following benefits:
- No buffer manual allocation and error handling for the general case
- More flexible API : width specifier, sign and prefix handling
- Simpler code

The more flexible API removes the need for manually tweaking the buffer afterwards, and so prevents relying on implementation details of IntegerToString.

Reviewed By: michaelrj, jhuber6

Differential Revision: https://reviews.llvm.org/D156981

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Revert "[libc] Better IntegerToString API"

This reverts commit 910cc05aae85a6b31e2a2ed87d3dd46db46fce04.

[libc] Better IntegerToString API

This patch is an alternative to D155902. It provides the following benefits:
- No buffer manual allocation and error handling for the general case
- More flexible

[libc] Better IntegerToString API

This patch is an alternative to D155902. It provides the following benefits:
- No buffer manual allocation and error handling for the general case
- More flexible API : width specifier, sign and prefix handling
- Simpler code

The more flexible API removes the need for manually tweaking the buffer afterwards, and so prevents relying on implementation details of IntegerToString.

Reviewed By: michaelrj, jhuber6

Differential Revision: https://reviews.llvm.org/D156981

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[libc] Add macro LIBC_THREAD_LOCAL.

It resolves to thread_local on all platform except for the GPUs on which
it resolves to nothing. The use of thread_local in the source code has been
replaced with

[libc] Add macro LIBC_THREAD_LOCAL.

It resolves to thread_local on all platform except for the GPUs on which
it resolves to nothing. The use of thread_local in the source code has been
replaced with the new macro.

Reviewed By: jhuber6

Differential Revision: https://reviews.llvm.org/D151486

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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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[libc][NFC] Simplify string-table generation internals.

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D150088

[libc] move strerror and strsignal to OS msg maps

Other OSes may have different mappings from error number to message.
This creates a system to allow new platforms to define their own
mappings.

Rev

[libc] move strerror and strsignal to OS msg maps

Other OSes may have different mappings from error number to message.
This creates a system to allow new platforms to define their own
mappings.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D147967

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[libc] move stdlib and stdio to new errno pattern

Fixes https://github.com/llvm/llvm-project/issues/61071

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D145191

[libc] add strsignal and refactor message mapping

The logic for strsignal and strerror is very similar, so I've moved them
both to use a shared utility (MessageMapper) for the basic
functionality.

[libc] add strsignal and refactor message mapping

The logic for strsignal and strerror is very similar, so I've moved them
both to use a shared utility (MessageMapper) for the basic
functionality.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D135322

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