[flang] Add UNSIGNED (#113504)

Implement the UNSIGNED extension type and operations under control of a
language feature flag (-funsigned).

This is nearly identical to the UNSIGNED feature that h

[flang] Add UNSIGNED (#113504)

Implement the UNSIGNED extension type and operations under control of a
language feature flag (-funsigned).

This is nearly identical to the UNSIGNED feature that has been available
in Sun Fortran for years, and now implemented in GNU Fortran for
gfortran 15, and proposed for ISO standardization in J3/24-116.txt.

See the new documentation for details; but in short, this is C's
unsigned type, with guaranteed modular arithmetic for +, -, and *, and
the related transformational intrinsic functions SUM & al.

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[flang][runtime] Prepare enabling PRINT of integer32 for device. (#86247)

This commit adds required files into the offload build closure,
which means adding RT_API_ATTRS and other markers.

The i

[flang][runtime] Prepare enabling PRINT of integer32 for device. (#86247)

This commit adds required files into the offload build closure,
which means adding RT_API_ATTRS and other markers.

The implementation does not work for CUDA yet, because of
std::variant,swap,reverse usage. These issues will be resolved
separately (e.g. by using libcudacxx header files).

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[flang] Initial UTF-8 support in runtime I/O

Implements UTF-8 encoding and decoding for external units
with OPEN(ENCODING='UTF-8'). This encoding applies to default
CHARACTER values that are not 7-

[flang] Initial UTF-8 support in runtime I/O

Implements UTF-8 encoding and decoding for external units
with OPEN(ENCODING='UTF-8'). This encoding applies to default
CHARACTER values that are not 7-bit ASCII as well as to
the wide CHARACTER kinds 2 and 4. Basic testing is in place
via direct calls to the runtime I/O APIs, but serious checkout
awaits lowering support of the wide CHARACTER kinds.

Differential Revision: https://reviews.llvm.org/D122038

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[flang][msvc] Avoid dependence on long double

MSVC does not support a distinct 80-bit extended precision
"long double" type. Rework the I/O runtime to avoid using
native C/C++ type names. Centrali

[flang][msvc] Avoid dependence on long double

MSVC does not support a distinct 80-bit extended precision
"long double" type. Rework the I/O runtime to avoid using
native C/C++ type names. Centralize the mappings between
the KIND= type parameters of REAL and their binary precisions
in the common real.h header file, and use KIND type parameter
values rather than binary precisions for clarity where
appropriate.

This patch, if successful, should obviate the need for
Differential review D88511.

(This patch anticipates a successful review of D88688, which
fixes the function that maps each kind of real to its maximum
number of significant decimal digits.)

Differential revision: https://reviews.llvm.org/D88752

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[flang] Reformat with latest clang-format and .clang-format

Original-commit: flang-compiler/f18@9fe84f45d7fd685051004678d6b5775dcc4c6f8f
Reviewed-on: https://github.com/flang-compiler/f18/pull/1094

[flang] Use hash table for UnitMap, avoid C++ STL binary dependence

Scan FORMAT strings locally to avoid C++ binary runtime dependence when computing deepest parenthesis nesting

Remove a dependency

[flang] Use hash table for UnitMap, avoid C++ STL binary dependence

Scan FORMAT strings locally to avoid C++ binary runtime dependence when computing deepest parenthesis nesting

Remove a dependency on ostream from runtime

Remove remaining direct external references from runtime to C++ library binaries

Remove runtime dependences on lib/common

SetPos() and SetRec()

Instantiate templates for input

Begin input; rearrange locking, deal with CLOSE races

View()

Update error message in test to agree with compiler change

First cut at real input

More robust I/O runtime error handling

Debugging of REAL input

Add iostat.{h,cpp}

Rename runtime/numeric-* to runtime/edit-*

Move templates around, templatize integer output editing

Move LOGICAL and CHARACTER output from io-api.cpp to edit-output.cpp

Change pointer argument to reference

More list-directed input

Complex list-directed input

Use enum class Direction rather than bool for templates

Catch up with changes to master

Undo reformatting of Lower code

Use record number instead of subscripts for internal unit

Unformatted sequential backspace

Testing and debugging

Dodge bogus GCC warning

Add <cstddef> for std::size_t to fix CI build

Address review comments

Original-commit: flang-compiler/f18@50406b349609efdde76e48bf2caa039d031dd1c4
Reviewed-on: https://github.com/flang-compiler/f18/pull/1053

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