[flang] Merge pull request flang-compiler/f18#90 from ThePortlandGroup/pmk5

Fix issue flang-compiler/f18#89

Original-commit: flang-compiler/f18@119fa65b2cc0ff3bb57dd4a0b17c08b9ddbaffd4
Reviewed-on: https://github.com/flang-compiler/f18/pull/90

[flang] clang-format

Original-commit: flang-compiler/f18@acb149dc7ca2e6c9f86a602d2fd0b234b636f9ee
Reviewed-on: https://github.com/flang-compiler/f18/pull/90

[flang] Fine tuning of space recognition.

Original-commit: flang-compiler/f18@622befa9ca00ef950f0f6575b71218b426caa974
Reviewed-on: https://github.com/flang-compiler/f18/pull/90
Tree-same-pre-rewrite: false

[flang] Dodge bogus warning about unused anonymous variable in refactored code.

Original-commit: flang-compiler/f18@1d3cfe003806254e8c4d6981d62d52dffa76be77
Reviewed-on: https://github.com/flang-compiler/f18/pull/90
Tree-same-pre-rewrite: false

[flang] Fix tokenization of signed-int-literal-constant, allow internal space.

Original-commit: flang-compiler/f18@afa6425b487c0cfb2d50b6b758055ed0dbe27300
Reviewed-on: https://github.com/flang-compiler/f18/pull/90
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#91 from ThePortlandGroup/omppar

Add OpenMP parallel directives and private/firstprivate clauses to pa…

Original-commit: flang-compiler/f18@ba4eeb5a97b34adc3895485d26c1556bf0cd9493
Reviewed-on: https://github.com/flang-compiler/f18/pull/91

[flang] Modified directive names and clauses to reflect in OpenMP Spec.

Original-commit: flang-compiler/f18@c2f756f4785271ff564636c821d868e9cb756935
Reviewed-on: https://github.com/flang-compiler/f18/pull/91

[flang] Add OpenMP parallel directives and private/firstprivate clauses to parser.

Original-commit: flang-compiler/f18@ea8abe45cc0ef2fce18d6f34b7e7cdda31ee2034
Reviewed-on: https://github.com/flang-compiler/f18/pull/91
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#88 from ThePortlandGroup/tsk3

Name resolution on interface blocks.

Original-commit: flang-compiler/f18@a902406caa0c695092f9fb85922133e7bfd6c854
Reviewed-on: https://github.com/flang-compiler/f18/pull/88

[flang] Refactor: make some methods out-of-line.

Original-commit: flang-compiler/f18@d2d5457e4653fb51f0c48b81066c5c38ba5ac302
Reviewed-on: https://github.com/flang-compiler/f18/pull/88

[flang] Support interface blocks.

Add subprogram symbols for each interface-body and set isInterface on
them. Create a symbol with GenericDetails for each generic interface
block and add interface specifications to the specific procedures of
the generic. InterfaceVisitor takes care of this.

Before processing the specification part of modules and subprograms,
collect the names of module subprograms and internal subprograms and add
them to the symbol table with SubprogramNameDetails. This allows us to
reference them from interface blocks in the specification part.
SubprogramNameDetails is converted to SubprogramDetails when the real
subprogram is visited.

This is achieved by setting subpNamesOnly_ and then walking the
ModuleSubprogramPart or InternalSubprogramPart. Creating the symbol and
scope for a module or subprogram now happens when the Module,
SubroutineSubprogram, or FunctionSubprogram node is encountered so
this can happen in the right order.

Add BeginSubprogram and EndSubprogram to handle the parts in common
between subprograms and interface specifications.

Add GenericSpec to type.h to represent all possible generic specs.
Only generic names are resolved so far.

Add tests for new error messages. Change resolve02.f90 to reflect the
new errors reported.

Original-commit: flang-compiler/f18@03148b49dd0c58e36aca2660a56fcefadd97b99d
Reviewed-on: https://github.com/flang-compiler/f18/pull/88
Tree-same-pre-rewrite: false

[flang] Separate const and non-const operator* in Indirection

Without this, Walk(const Indirection<T>...) can call a Walk function
with non-const T.

Original-commit: flang-compiler/f18@8c98b0a9b971670aa42d6075979162ca44b124e3
Reviewed-on: https://github.com/flang-compiler/f18/pull/88
Tree-same-pre-rewrite: false

[flang] Extract class SubprogramVisitor out of ResolveNamesVisitor.

This is just refactoring. SubprogramVisitor now contains the functionality
related to subprograms, including statement functions. This is preparation
for handling interface blocks.

Also, change MessageHandler to create the Messages object and return it
through an accessor rather than having it created outside and passed in.
This saves us from having to pass it up through the chain of constructors.

Original-commit: flang-compiler/f18@f73cfa2fe928acc7e3744991a842231260467c6e
Reviewed-on: https://github.com/flang-compiler/f18/pull/88
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#87 from ThePortlandGroup/pmk4

Quash extra spaces after macro replacement

Original-commit: flang-compiler/f18@fd80d448038360f6e9acc4ad85e4c8f1835fb211
Reviewed-on: https://github.com/flang-compiler/f18/pull/87

[flang] address review comment

Original-commit: flang-compiler/f18@bd8a96cf70ba69ff12b73ee5b3c3f804d0842ed4
Reviewed-on: https://github.com/flang-compiler/f18/pull/87

[flang] Document preprocessing more.

Original-commit: flang-compiler/f18@93f7a0b01139e3788926aa82f60bd9a839941ae1
Reviewed-on: https://github.com/flang-compiler/f18/pull/87
Tree-same-pre-rewrite: false

[flang] a little more refinement

Original-commit: flang-compiler/f18@5754d426e88740b86829ee0b61462251d531f7b2
Reviewed-on: https://github.com/flang-compiler/f18/pull/87
Tree-same-pre-rewrite: false

[flang] Clean up for merge.

Original-commit: flang-compiler/f18@608ef132c0e3ede991a4af1caf116232ec7fbb42
Reviewed-on: https://github.com/flang-compiler/f18/pull/87
Tree-same-pre-rewrite: false

[flang] Remove blanks from macro-replaced text in fixed form source.

Original-commit: flang-compiler/f18@c33dad2162a7553abba8d8bd0240141d6f2657a1
Reviewed-on: https://github.com/flang-compiler/f18/pull/87
Tree-same-pre-rewrite: false

[flang] Implement proper swap() and operator=(&&) for some types that need them.

Original-commit: flang-compiler/f18@a9c53d8bb5bb9d2fc0c3976c3f693f1672d5ac8e
Reviewed-on: https://github.com/flang-compiler/f18/pull/87
Tree-same-pre-rewrite: false

[flang] Quash multiple blanks when preprocessing.

Original-commit: flang-compiler/f18@d91680b469fc627a1325fe28c7382fd16a279892
Reviewed-on: https://github.com/flang-compiler/f18/pull/87
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#86 from ThePortlandGroup/pmk3

Tweak compiler directive continuation line processing

Original-commit: flang-compiler/f18@bbd5250db97b4acfc28ac23926d8911222493dcf
Reviewed-on: https://github.com/flang-compiler/f18/pull/86

[flang] Tweak compiler directive continuation line processing to insert a space across the line break when needed.

Original-commit: flang-compiler/f18@de3a4a01ec58580d88fcec60637cbd96bf022917
Reviewed-on: https://github.com/flang-compiler/f18/pull/86

[flang] Merge pull request flang-compiler/f18#85 from ThePortlandGroup/pmk2

Fixes for compiler directive continuation lines

Original-commit: flang-compiler/f18@e4a5e129f5ee059db67528d776349fb1b24611ec
Reviewed-on: https://github.com/flang-compiler/f18/pull/85

[flang] Fix another bug found in test.

Original-commit: flang-compiler/f18@7c5df7f3f8cfb8eb543d0177ae3cce837b4d30c8
Reviewed-on: https://github.com/flang-compiler/f18/pull/85

[flang] fix previous changes after testing

Original-commit: flang-compiler/f18@c088704f135cdb27cf13b5961ee1563ea2389aef
Reviewed-on: https://github.com/flang-compiler/f18/pull/85
Tree-same-pre-rewrite: false

[flang] Observe line length limit when unparsing BOZ literals.

Original-commit: flang-compiler/f18@2c2e4035b6cb3cbeeed3f2bd555022df97c93c8c
Reviewed-on: https://github.com/flang-compiler/f18/pull/85
Tree-same-pre-rewrite: false

[flang] Fix compiler directive continuation lines.

Original-commit: flang-compiler/f18@f30e3b71f86bcec3f7ff0fb956f45ffb2a5427e6
Reviewed-on: https://github.com/flang-compiler/f18/pull/85
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#84 from ThePortlandGroup/pmk1

Build with g++ 8.1.0

Original-commit: flang-compiler/f18@a1cd245ba206493e296dcea50ea0786b7b02b8ef
Reviewed-on: https://github.com/flang-compiler/f18/pull/84

[flang] reformat for merge

Original-commit: flang-compiler/f18@ca8f9611f52ad24d969343a00e31b5e7e1675d38
Reviewed-on: https://github.com/flang-compiler/f18/pull/84

[flang] Keep message.cc buildable by g++ 7.2.

Original-commit: flang-compiler/f18@edd311972f1bd0da2df1e373a211babca5fa842f
Reviewed-on: https://github.com/flang-compiler/f18/pull/84
Tree-same-pre-rewrite: false

[flang] Update README.md, can build with clang 6.0 + g++ 8.1.0 headers.

Original-commit: flang-compiler/f18@f57451d8d4ae47ee19e5428a6120d0fa9e682aa6
Reviewed-on: https://github.com/flang-compiler/f18/pull/84
Tree-same-pre-rewrite: false

[flang] Update README with g++ 8.1.

Original-commit: flang-compiler/f18@a047f116da80058571ed4834c7f93eed4edd28d2
Reviewed-on: https://github.com/flang-compiler/f18/pull/84
Tree-same-pre-rewrite: false

[flang] Build with g++ 8.1.0 compiler and headers.

Original-commit: flang-compiler/f18@53d80fc8548e04cb80b6acdd7cde1a12641657c0
Reviewed-on: https://github.com/flang-compiler/f18/pull/84
Tree-same-pre-rewrite: false

[flang] Copyediting of README.md.

Original-commit: flang-compiler/f18@32ffc711b61fbfdefee2881cf051e207f6fc9a96
Reviewed-on: https://github.com/flang-compiler/f18/pull/84
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#83 from ThePortlandGroup/pmk-msg

Support attachments to messages

Original-commit: flang-compiler/f18@5cdace25f1c8b02c32afcc31c1755d4fdeb96e64
Reviewed-on: https://github.com/flang-compiler/f18/pull/83

[flang] Make sure that fixed form compiler directive line is not a continuation.

Original-commit: flang-compiler/f18@32994064f2a400a87e0dbe4aba1b0ae025a16293
Reviewed-on: https://github.com/flang-compiler/f18/pull/83

[flang] Fix bug noticed in code review.

Original-commit: flang-compiler/f18@7fc497064ea845e9bd8a419bd04400be60b7aa19
Reviewed-on: https://github.com/flang-compiler/f18/pull/83
Tree-same-pre-rewrite: false

[flang] Improve error messages on bad escaped characters.

Original-commit: flang-compiler/f18@fb64849d6a498e16a464d213da8d23812527d6ba
Reviewed-on: https://github.com/flang-compiler/f18/pull/83
Tree-same-pre-rewrite: false

[flang] fix bug that could lose nonstandard usage warning messages

Original-commit: flang-compiler/f18@ff48aa95fd0b2c7bad474631c576f3fb4c566a91
Reviewed-on: https://github.com/flang-compiler/f18/pull/83
Tree-same-pre-rewrite: false

[flang] Use attachments to messages in resolve-names.cc

Original-commit: flang-compiler/f18@d24674f4eadfac60192a587170b29917d7c06b9b
Reviewed-on: https://github.com/flang-compiler/f18/pull/83
Tree-same-pre-rewrite: false

[flang] Use attachment for context.

Original-commit: flang-compiler/f18@e92cf73cf99f44d44f42c9728216fd8b07548d2c
Reviewed-on: https://github.com/flang-compiler/f18/pull/83
Tree-same-pre-rewrite: false

[flang] Allow attachments to Messages.

Original-commit: flang-compiler/f18@08785977cef724a505f886cc9474c996b59377e6
Reviewed-on: https://github.com/flang-compiler/f18/pull/83
Tree-same-pre-rewrite: false

[flang] More clean-up.

Original-commit: flang-compiler/f18@ed60db370808302466057c6f95a23879bce5342f
Reviewed-on: https://github.com/flang-compiler/f18/pull/83
Tree-same-pre-rewrite: false

[flang] Some initial clean-up in messages, use std::variant to make component possibilities clearer.

Original-commit: flang-compiler/f18@9b7eeb23548b75138f3956ec06dbb582da1aa1d9
Reviewed-on: https://github.com/flang-compiler/f18/pull/83
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#80 from ThePortlandGroup/pmk-ptdump

Clean up dump-parse-tree.h

Original-commit: flang-compiler/f18@c0e3940cb0d98545b9befdc4466d12e1d447c28e
Reviewed-on: https://github.com/flang-compiler/f18/pull/80

[flang] incorporate review comment

Original-commit: flang-compiler/f18@15bb84470dd90d1425ca96c8d4d29cc247d44687
Reviewed-on: https://github.com/flang-compiler/f18/pull/80

[flang] reformat

Original-commit: flang-compiler/f18@d809458bb3e9ad729b10399f68f8b66e85a0f636
Reviewed-on: https://github.com/flang-compiler/f18/pull/80
Tree-same-pre-rewrite: false

[flang] Clean up dump-parse-tree.h

Original-commit: flang-compiler/f18@50241163976fe889acd851c5da981f4eb2506205
Reviewed-on: https://github.com/flang-compiler/f18/pull/80
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#81 from ThePortlandGroup/pmk-nag

Fixes to bugs found by NAG tests, and clangification of error message layout

Original-commit: flang-compiler/f18@2c852cedaac2248103b72936ffe69a11d03571a7
Reviewed-on: https://github.com/flang-compiler/f18/pull/81

[flang] fix building with clang after merge

Original-commit: flang-compiler/f18@7b53bf2a16b53f2d3954bb5784febb5e4baebe44
Reviewed-on: https://github.com/flang-compiler/f18/pull/81

[flang] Do not sort messages by location for now.

Original-commit: flang-compiler/f18@8a92dad973be365f0a124447d169d454fa428d42
Reviewed-on: https://github.com/flang-compiler/f18/pull/81
Tree-same-pre-rewrite: false

[flang] reformat for merge

Original-commit: flang-compiler/f18@ccf265dad58fd4f69f555cdd12f562dc2d085fd5
Reviewed-on: https://github.com/flang-compiler/f18/pull/81
Tree-same-pre-rewrite: false

[flang] Improve error message location.

Original-commit: flang-compiler/f18@5efd011d184a1dc88262ce68a7cbee6094c1ca2f
Reviewed-on: https://github.com/flang-compiler/f18/pull/81
Tree-same-pre-rewrite: false

[flang] Add TODO comment.

Original-commit: flang-compiler/f18@1a82940ca80a63f1cc5eb0d295ee1426b0589506
Reviewed-on: https://github.com/flang-compiler/f18/pull/81
Tree-same-pre-rewrite: false

[flang] Fix preprocessor tokenization of .NE. style operators.

Original-commit: flang-compiler/f18@ab547b89e89a788a12ae67a46339b9e6cf1a83dd
Reviewed-on: https://github.com/flang-compiler/f18/pull/81
Tree-same-pre-rewrite: false

[flang] Allow conditional compilation directives to affect continuation lines (again).

Original-commit: flang-compiler/f18@9b9fd356ddfdd4934ddd7de9e3ce8cd0ebe606c7
Reviewed-on: https://github.com/flang-compiler/f18/pull/81
Tree-same-pre-rewrite: false

[flang] Ignore spaces in FORMAT specifications, even in free form.

Original-commit: flang-compiler/f18@3f65d35b1c624212c3ad22351e61b9cf3f0ba03e
Reviewed-on: https://github.com/flang-compiler/f18/pull/81
Tree-same-pre-rewrite: false

[flang] Fix two cosubscript parsing problems with lookahead.

Original-commit: flang-compiler/f18@b490c60fb0f68b638f13085ebbd92ec15340713e
Reviewed-on: https://github.com/flang-compiler/f18/pull/81
Tree-same-pre-rewrite: false

[flang] Fix comment recognition in print *, "..."!comment

Original-commit: flang-compiler/f18@d647b8ed2faa53f77a17de22336f5950eeef9096
Reviewed-on: https://github.com/flang-compiler/f18/pull/81
Tree-same-pre-rewrite: false

[flang] Make messages more like clang's.

Original-commit: flang-compiler/f18@176cdf8e6ce79bb6a8fb2d947b218d17f315b071
Reviewed-on: https://github.com/flang-compiler/f18/pull/81
Tree-same-pre-rewrite: false

[flang] Clean up message output a little; remove unused APIs.

Original-commit: flang-compiler/f18@64298b8d74478684c77d3d18282e8a47a0186a97
Reviewed-on: https://github.com/flang-compiler/f18/pull/81
Tree-same-pre-rewrite: false

[flang] Don't process preprocessor directives amid continuation lines any more.

Original-commit: flang-compiler/f18@4a3dbb5d3e24559f20a90f4ebc021c294817cd24
Reviewed-on: https://github.com/flang-compiler/f18/pull/81
Tree-same-pre-rewrite: false

[flang] Allow $ and @ in defined operator names.

Original-commit: flang-compiler/f18@3cf7533a3bfe35b5dcb4396f35339ee34d34c272
Reviewed-on: https://github.com/flang-compiler/f18/pull/81
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#79 from ThePortlandGroup/tsk3

Implement USE statements.

Original-commit: flang-compiler/f18@053461f6de9f4d0c86cc96543915adabf1d16df3
Reviewed-on: https://github.com/flang-compiler/f18/pull/79

[flang] Support for USE statements.

When a USE statement is encountered, find the scope corresponding to the
module. This is now stored in the ModuleDetails of the module symbol.
useModuleScope_ tracks this while processing the USE. Currently only
modules defined in the same file work because we don't have module files.

At the end of a USE that isn't a use-only, add all public names that
were not renamed.

AddUse() handles recording of a USE by creating a local symbol with
UseDetails that tracks the use-symbol in the module and the location of
the USE (for error messages). If an ambiguous USE is detected, the
UseDetails are replaced by UseErrorDetails. This tracks the locations of
all the uses so that they can be referenced in a diagnostic.

Detect attempts to re-declare use-associated symbols as well as changing
their attributes (except for ASYNCHRONOUS and VOLATILE).

Add missing checks for access-stmt in scoping units other than modules.

Add tests for the new errors.

Reorganize the MessageHandler::Say() overloadings to prevent them from
becoming too numerous.

Original-commit: flang-compiler/f18@cc0523134c85ee2fe156b4f5c8d042e73ac92549
Reviewed-on: https://github.com/flang-compiler/f18/pull/79

[flang] resolve-names.cc reorganization and cleanup.

Add ScopeHandle class to manage the stack of scopes and MakeSymbol(), which
makes a symbol in the current scope. Move the call to ApplyImplicitScopes()
into PopScope() as it must be done for each scope.

Add ModuleVisitor class to manage module-related resolution. Currently that
consists of beginning and ending modules and access statements. This is
preparation for further module work.

Replace references to parser::CharBlock with SourceName.

Original-commit: flang-compiler/f18@913df85e48f1e06d0c75bb517f5edd898e8efd69
Reviewed-on: https://github.com/flang-compiler/f18/pull/79
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#78 from ThePortlandGroup/sch_llvm2

Add dependency to LLVM & Clang libraries (backport)

Original-commit: flang-compiler/f18@c0d84e4ae39efd6a2fd971f81008c7d4d74c6b80
Reviewed-on: https://github.com/flang-compiler/f18/pull/78

[flang] misc changes in response to pul-request comments

Original-commit: flang-compiler/f18@1b3332d2adc094a318415609e9ba7e881bf5074a
Reviewed-on: https://github.com/flang-compiler/f18/pull/78

[flang] fix typo in comment

Original-commit: flang-compiler/f18@477e852903089cecb7f6049539bdb5f5a8d633b1
Reviewed-on: https://github.com/flang-compiler/f18/pull/78
Tree-same-pre-rewrite: false

[flang] Add missing underscore to private members

Original-commit: flang-compiler/f18@7247cf4c3a3a7a83be923956cbb10c123a9430e0
Reviewed-on: https://github.com/flang-compiler/f18/pull/78
Tree-same-pre-rewrite: false

[flang] Fix duplicate copyright message

Original-commit: flang-compiler/f18@65e3e864402f3771f618868a2d18ee1d182847f0
Reviewed-on: https://github.com/flang-compiler/f18/pull/78
Tree-same-pre-rewrite: false

[flang] Manual backport of sch_llvm branch

Original-commit: flang-compiler/f18@17ee2d8e3ac5bfb633cc2792ee7873c543696e72
Reviewed-on: https://github.com/flang-compiler/f18/pull/78
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#77 from ThePortlandGroup/tsk4

Source code cleanup

Original-commit: flang-compiler/f18@63b5a0e133ce259d7a1690237ae2534f5c803505
Reviewed-on: https://github.com/flang-compiler/f18/pull/77

[flang] Run clang-format on all .h and .cc files.

Original-commit: flang-compiler/f18@b7f02808a244fbb2597dc2bdc4430b292b433c03
Reviewed-on: https://github.com/flang-compiler/f18/pull/77

[flang] Normalize namespace definitions.

Replace `namespace Fortran { namespace parser { ... } }` with
`namespace Fortran::parser { ... }` and similarly for semantics.

Original-commit: flang-compiler/f18@838c9539b2497f8dd1e33bd23623a5373a694e7b
Reviewed-on: https://github.com/flang-compiler/f18/pull/77
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#76 from ThePortlandGroup/sjs-os1

Remove unused code; rename dump-parse-tree

Original-commit: flang-compiler/f18@e46b5087b7b18e5d65165ff134de50683451aed6
Reviewed-on: https://github.com/flang-compiler/f18/pull/76

[flang] Update CMakefiles and #include paths.

Original-commit: flang-compiler/f18@1b7b8259b39760446f9aaee8b104cc1a8543f5dd
Reviewed-on: https://github.com/flang-compiler/f18/pull/76

[flang] Removed unused files and declarations.
Renamed ParseTreeDump to dump-parse-tree.

Original-commit: flang-compiler/f18@9de97328f1f477441863246c7c1bd8ff4f32498b
Reviewed-on: https://github.com/flang-compiler/f18/pull/76
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#75 from ThePortlandGroup/tsk4

Cleanup

Original-commit: flang-compiler/f18@d1545693d1ed4716603a6526f2f60f604a48be74
Reviewed-on: https://github.com/flang-compiler/f18/pull/75

[flang] Make include guards consistent.

The include guard symbol is `FORTRAN_$dir_$file_H_` where $dir is the
subdirectory of `lib` and $file is the basename of the header file.
Those names are mapped to uppercase and hyphens are replaced by
underscores.

Original-commit: flang-compiler/f18@ac9c0e7106c898479cf35086861a711ab7c0210a
Reviewed-on: https://github.com/flang-compiler/f18/pull/75

[flang] Remove unused files.

Original-commit: flang-compiler/f18@856315fd43308d49c61bb2a0f10c77e01b32fdbc
Reviewed-on: https://github.com/flang-compiler/f18/pull/75
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#74 from ThePortlandGroup/tsk4

Add copyright notices.

Original-commit: flang-compiler/f18@20f64da9d97cec06f422ff9ed7420fcebd78472f
Reviewed-on: https://github.com/flang-compiler/f18/pull/74

[flang] Add copyright notices.

For source files (C++, Fortran, CMake) add copyright and license.
For documentation files add just copyright.

Original-commit: flang-compiler/f18@38381aed839ef091a44ea8f2ef7bc5346d776c67
Reviewed-on: https://github.com/flang-compiler/f18/pull/74

[flang] Merge pull request flang-compiler/f18#73 from ThePortlandGroup/pmk-scrub3

More clean-up & build with Clang

Original-commit: flang-compiler/f18@c809062f1176338223e897f32139ffe3d86d5eae
Reviewed-on: https://github.com/flang-compiler/f18/pull/73

[flang] Clean out the PGI stuff from CMakeLists.txt.

Original-commit: flang-compiler/f18@806db179ce8f9437f301772712baf69b8f0e4135
Reviewed-on: https://github.com/flang-compiler/f18/pull/73

[flang] Fix a static_assert and a message location bug in first().

Original-commit: flang-compiler/f18@cd85bff31b1a93bfd7f9ad8344982f88670e3365
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] silence a warning

Original-commit: flang-compiler/f18@dc91727ac4d81a6257c0011b75d4311e2751f941
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] More Clang work.

Original-commit: flang-compiler/f18@7ff98ad77848c314a5d7ed5559087610bae4b805
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] Use libc++ with clang.

Original-commit: flang-compiler/f18@d81b8d87f8712bc478931637f124c5a6a22d928b
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] Use first() to define operator|| when compiling with clang.

Original-commit: flang-compiler/f18@7bf98d683c46b29f6bed4a00dfd0eceebc9dcea7
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] Remove excess space at end of line.

Original-commit: flang-compiler/f18@900dc4e254ea680f33382e35eab1fd5b1321ea09
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] Refine CMakeLists.txt tweaks.

Original-commit: flang-compiler/f18@b40c68f9ab8fda8b8110159b6f6e9faf530aeedc
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] Package clang build settings.

Original-commit: flang-compiler/f18@775b42598d278e58277e7f730b8f51d9657db2e4
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] Patches to permit building with Clang without notes or warnings.

Original-commit: flang-compiler/f18@0e74b10603ecceaca1781ecd0ee630de89e8e7f1
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] Use first() more.

Original-commit: flang-compiler/f18@a2f2fdf869bd9a73a3b900d599f7adca2b02a8cd
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] Implement first(...) as attempt at a faster set of alternatives.

Original-commit: flang-compiler/f18@9f6a26cee636c3cc91d91583fd2b785f26a618c2
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] Attempt to build f18 with clang.

Original-commit: flang-compiler/f18@0480837234cfe407aac0795cc5c35dfa6ee1139d
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] Attempt to build f18 with clang.

Original-commit: flang-compiler/f18@86fec97e418d5e4156dac8a8ea84764c81e6a12a
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false

[flang] Resolve an old TODO by flattening a std::optional<std::optional<>>.

Original-commit: flang-compiler/f18@05f47831fc2d6ce7a59993ac8670db8e85b89706
Reviewed-on: https://github.com/flang-compiler/f18/pull/73
Tree-same-pre-rewrite: false