[flang] Update OptionComparison.md

Original-commit: flang-compiler/f18@27c77d164f415ebf928763270403c2d19aac55ad
Reviewed-on: https://github.com/flang-compiler/f18/pull/379

[flang] Update OptionComparison.md

Original-commit: flang-compiler/f18@9926fc91458bfcd55795a7e0768aaaf8a5651994
Reviewed-on: https://github.com/flang-compiler/f18/pull/379
Tree-same-pre-rewrite: false

[flang] Fixed an encoding error

Original-commit: flang-compiler/f18@0f9eff1bb00532bfc647a5370ba1207485915a63
Reviewed-on: https://github.com/flang-compiler/f18/pull/379
Tree-same-pre-rewrite: false

[flang] Description of command line options for Fortran compilers.

Original-commit: flang-compiler/f18@f170466bb99892d5c0bd09fcf624b0ecacbdfb83
Reviewed-on: https://github.com/flang-compiler/f18/pull/379
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#375 from flang-compiler/if-stmt-2

Remove unused variable in check-if-stmt.cc

Original-commit: flang-compiler/f18@274d66bcb048a49fd23fb587349f9603dd0907e3
Reviewed-on: https://github.com/flang-compiler/f18/pull/375

[flang] Remove unused variable in check-if-stmt.cc

Original-commit: flang-compiler/f18@520751311d5791341112ffa3a9b7e0fba90440b3
Reviewed-on: https://github.com/flang-compiler/f18/pull/375

[flang] Merge pull request flang-compiler/f18#378 from flang-compiler/pmk-fix376

Fix bugs flang-compiler/f18#376, flang-compiler/f18#377

Original-commit: flang-compiler/f18@89ef8f927070408b71fc0c8c6558043ce510870b
Reviewed-on: https://github.com/flang-compiler/f18/pull/378

[flang] Address comments, clean up warnings

Original-commit: flang-compiler/f18@a5eeeb4430825020e14141c0d51d1bb7160546e5
Reviewed-on: https://github.com/flang-compiler/f18/pull/378

[flang] Also fix bug#377

Original-commit: flang-compiler/f18@56631cf5e10a5f7f2909d8b83ede72b21d986348
Reviewed-on: https://github.com/flang-compiler/f18/pull/378
Tree-same-pre-rewrite: false

[flang] Clean up and prep for review

Original-commit: flang-compiler/f18@3f96c673e06b630050f8082d9ba019a0ba4ed21b
Reviewed-on: https://github.com/flang-compiler/f18/pull/378
Tree-same-pre-rewrite: false

[flang] Fix bug flang-compiler/f18#376, internal error when correcting misparse of structure constructor

Original-commit: flang-compiler/f18@f18a94ef9690c412907c733ac08be6736ea4eaad
Reviewed-on: https://github.com/flang-compiler/f18/pull/378
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#368 from flang-compiler/tsk4b

Rework .mod file writing for subprogram interfaces

Original-commit: flang-compiler/f18@807824cb512f73d0bbcd8c94985c99185735fa72
Reviewed-on: https://github.com/flang-compiler/f18/pull/368

[flang] Fix test

A sequence type must have a component.

Original-commit: flang-compiler/f18@937b3eaf068651a8fb07e45348ef119b0e420b70
Reviewed-on: https://github.com/flang-compiler/f18/pull/368

[flang] Rework .mod file writing for subprogram interfaces

A subprogram interface in a `.mod` file requires all of the symbols
needed to declare the function return value and dummy arguments.
Some of those were missing.

`SubprogramSymbolCollector` recursively discovers all such symbols,
including symbols used in type parameters, array bounds, character
lengths, parent types.

Common blocks require special handling: If any of the symbols that
are need appear in a common block, we have to include that common block
and all other symbols in it. To make that easier to figure out, add the
`commonBlock` property to `ObjectEntityDetails` to map the entity to
the common block it is in, if any.

Original-commit: flang-compiler/f18@08709f8e88c3b37bdf8461f34340dc345dfbb085
Reviewed-on: https://github.com/flang-compiler/f18/pull/368
Tree-same-pre-rewrite: false

[flang] Resolve LHS in pointer assignment

Original-commit: flang-compiler/f18@9a3525275cb8b25c6be80635a40d182b73042ea4
Reviewed-on: https://github.com/flang-compiler/f18/pull/368
Tree-same-pre-rewrite: false

[flang] Dump function return attributes

Also, change SubprogramDetails::result_ from `std::optional<Symbol *>`
to `Symbol *`. We don't need two levels of optional-ness.

Original-commit: flang-compiler/f18@db3b874946dc9b139009d7e10832edb2a076a7bc
Reviewed-on: https://github.com/flang-compiler/f18/pull/368
Tree-same-pre-rewrite: false

[flang] Don't add inherited procedures to generic binding

In this example:
```
  type t1
  contains
    procedure, nopass :: s1
    generic :: foo => s1
  end type
  type, extends(t1) :: t2
  contains
    procedure, nopass :: s2
    generic :: foo => s2
  end type
```

The GenericBindingDetails for foo in t2 include both s1 and s2 as
specific procs. There is no way to distinguish between the binding in
the current type and the binding that was inherited. In particular,
the .mod file will have a binding for s1 in t2, so it won't match the
original source (for exampke, see the old version of modfile14.f90).

Original-commit: flang-compiler/f18@4e2c6be5cbdc5d31c41f0e44b85985b4fb69210d
Reviewed-on: https://github.com/flang-compiler/f18/pull/368
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#370 from flang-compiler/pmk-fix363

Fix flang-compiler/f18#363: Adjust member function names in integer.h to avoid confusion.

Original-commit: flang-compiler/f18@bdd750f742eafde96054e438731137e80673d5aa
Reviewed-on: https://github.com/flang-compiler/f18/pull/370

[flang] Adjust member function names in integer.h to avoid confusion.

Original-commit: flang-compiler/f18@56dba8fa0897294b1a6f59348938312c0dff3e7b
Reviewed-on: https://github.com/flang-compiler/f18/pull/370

[flang] Merge pull request flang-compiler/f18#373 from flang-compiler/pmk-source

Fix flang-compiler/f18#358: Define and use UnlabeledStatement<> for if & forall

Original-commit: flang-compiler/f18@7c76ba5158cdbbe4461d15ecffbf754e7172667c
Reviewed-on: https://github.com/flang-compiler/f18/pull/373

[flang] some debugging after more testing

Original-commit: flang-compiler/f18@005b841dd1140a809fb8123ed5b02048b8e1a4d3
Reviewed-on: https://github.com/flang-compiler/f18/pull/373

[flang] Use source location in IF statement checks.

Original-commit: flang-compiler/f18@9e08746e2b4487bddf2e4b3580cdea4568fa5d53
Reviewed-on: https://github.com/flang-compiler/f18/pull/373
Tree-same-pre-rewrite: false

[flang] Fix typo

Original-commit: flang-compiler/f18@c5b05009df4562f79fc0e219c73ec6123b9982c1
Reviewed-on: https://github.com/flang-compiler/f18/pull/373
Tree-same-pre-rewrite: false

[flang] Fix typo

Original-commit: flang-compiler/f18@6be309300e329487f39c546e6d07ae7dc82d1ac0
Reviewed-on: https://github.com/flang-compiler/f18/pull/373
Tree-same-pre-rewrite: false

[flang] Define and use UnlabeledStatement<> for if & forall

Original-commit: flang-compiler/f18@028e6aba6cd0ca40533401fcd4bab38e94f1f43a
Reviewed-on: https://github.com/flang-compiler/f18/pull/373
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#372 from flang-compiler/tsk3

Name resolution bug fixes

Original-commit: flang-compiler/f18@74c994e9a5b90daedff591891d60ba83601505db
Reviewed-on: https://github.com/flang-compiler/f18/pull/372

[flang] Name resolution bug fixes

Fix a but where a derived type was not use-associated correctly
due to missing call to `GetUltimate()`.

Fix a bug with access statement, generic interface, and derived
type all with the same name.

Remove some TODOs that have been done.

Original-commit: flang-compiler/f18@4ba2b64c6d291d04691891535da96f425dda2338
Reviewed-on: https://github.com/flang-compiler/f18/pull/372

[flang] Merge pull request flang-compiler/f18#371 from flang-compiler/pmk-parens

Fix flang-compiler/f18#350: insert parens into formatted expressions only when required

Original-commit: flang-compiler/f18@24fd62850cbb3e50aa8185bc61d2683e723810f8
Reviewed-on: https://github.com/flang-compiler/f18/pull/371

[flang] Revert to AsFortran in module file output.

Original-commit: flang-compiler/f18@3dc7f685d177788f8f13d97d7e03aa00720f4730
Reviewed-on: https://github.com/flang-compiler/f18/pull/371

[flang] Use operator<< in test.

Original-commit: flang-compiler/f18@e3f321e9f0a1995b82b33de2911ca8a1754b8e91
Reviewed-on: https://github.com/flang-compiler/f18/pull/371
Tree-same-pre-rewrite: false

[flang] Logical operation precedence

Original-commit: flang-compiler/f18@060bc39fb4f42a9ac82b05a0603d62a2bdc3cb30
Reviewed-on: https://github.com/flang-compiler/f18/pull/371
Tree-same-pre-rewrite: false

[flang] Pass tests

Original-commit: flang-compiler/f18@ffb057f262c63e877f5bebc9604f795804bc1042
Reviewed-on: https://github.com/flang-compiler/f18/pull/371
Tree-same-pre-rewrite: false

[flang] work in progress

Original-commit: flang-compiler/f18@33ea8e506a114350d4c587ed14c6f5dacbd5379a
Reviewed-on: https://github.com/flang-compiler/f18/pull/371
Tree-same-pre-rewrite: false

[flang] Move some AsFortran() implementations into new formatting.cc; use precedence for parentheses

Original-commit: flang-compiler/f18@2b5fa051df3c8e183349388181e66e085385396e
Reviewed-on: https://github.com/flang-compiler/f18/pull/371
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#352 from flang-compiler/pmk-parsing

Fix some parsing issues found by Steve

Original-commit: flang-compiler/f18@683766f7f512f5ea5d9b4c15ea71c6d82aada93c
Reviewed-on: https://github.com/flang-compiler/f18/pull/352

[flang] Add extension edit descriptors to the unparser.

Original-commit: flang-compiler/f18@74e09e249a0e99059cd4d0fd89deadd2bc82b5a0
Reviewed-on: https://github.com/flang-compiler/f18/pull/352

[flang] Support CONVERT= and DISPOSE= on INQUIRE

Original-commit: flang-compiler/f18@fbedd32376eb71d289177cfe127d1d4835a51a61
Reviewed-on: https://github.com/flang-compiler/f18/pull/352
Tree-same-pre-rewrite: false

[flang] Check int literals for overflow when kind is known.

improve test

Original-commit: flang-compiler/f18@09ce783cd30e6d70829d0b5596fe8f3e0f88c64f
Reviewed-on: https://github.com/flang-compiler/f18/pull/352
Tree-same-pre-rewrite: false

[flang] Allow dollar and backslash formats

Original-commit: flang-compiler/f18@4d8d6e599eab130a9026c53f404a7036d4410c47
Reviewed-on: https://github.com/flang-compiler/f18/pull/352
Tree-same-pre-rewrite: false

[flang] Allow multiple associations on legacy POINTER declaration

fix that fix

Original-commit: flang-compiler/f18@f096b73842cc0d443517a1075b3a31dd9ed8fdca
Reviewed-on: https://github.com/flang-compiler/f18/pull/352
Tree-same-pre-rewrite: false

[flang] Update documentation to reflect current intrinsic procedure support in f18

Merge pull request flang-compiler/f18#366 from flang-compiler/jpr0

Original-commit: flang-compiler/f18@0f310c8a8cf48ea61990ffa3ebcf2e15b8e7e73d

[flang] Address review comment

Original-commit: flang-compiler/f18@1e3b3b457d5128b6a2419c6fac8e8e4f8a8bfb28

[flang] Update documentation with status of intrinsic procedure support in f18

Original-commit: flang-compiler/f18@aa12037a5b923cbcafd04430a8436900077c6f78
Tree-same-pre-rewrite: false

[flang] Remove useless dummy return statements

I first added these because I had issues with return type deduction
in lambdas, but they are actually useless when the return type is
specified in the lambda signature.

Original-commit: flang-compiler/f18@5bcbbd8bdcef2e5c34edbfa755572e74514551fe
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#365 from flang-compiler/do2

Fix semantics test for "DO".

Original-commit: flang-compiler/f18@62794b980ec1ba1c681a84d8533fe9df5a9ea68b
Reviewed-on: https://github.com/flang-compiler/f18/pull/365

[flang] This test fails when the directory in which test tests are run contains a path that matches the pattern "do *[1-9]".  In my case, I had a directory called "do1".  The "*" is not necessary in the pattern.  Now the test passes unless the directory contains a " ".

Original-commit: flang-compiler/f18@462f15e4e7c1e6a2c266700e4548f67ba9b32ca9
Reviewed-on: https://github.com/flang-compiler/f18/pull/365

[flang] Fix F18 scalar integer power algorithm

Merge pull request flang-compiler/f18#362 from flang-compiler/jpr1

Original-commit: flang-compiler/f18@9f3f42fbadabfd7841478ce872fa232be601b2d2

[flang] Fix F18 scalar integer power algorithm

Original-commit: flang-compiler/f18@f0609e7ace60d6272285eda9d57e4052632b0e3c

[flang] Fix compilation issues of PR flang-compiler/f18#292

Merge pull request flang-compiler/f18#361 from flang-compiler/jpr0

Original-commit: flang-compiler/f18@37252adf0ec6f9968c2ff8e1f720459d89f55b6a

[flang] Add todo for bessel function default support

Original-commit: flang-compiler/f18@3842e7f5acda4bb35cf6ac235250f1ba4adee504

[flang] Fix compilation failure on PowerPC

Original-commit: flang-compiler/f18@f79f4973b62c378fea2de71eb002b235c53a7c28
Tree-same-pre-rewrite: false

[flang] Remove non standard use of bessel C functions

Original-commit: flang-compiler/f18@a40559372a6c7476eb999ecdb2b9bee681ad4122
Tree-same-pre-rewrite: false

[flang] Silence GCC 8.1 spurious warning

Original-commit: flang-compiler/f18@69e05d0632cd9722767ce4c945a614a29917ec92
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#364 from flang-compiler/sjs-make-install

Add CMake rules to install static and shared libraries.

Original-commit: flang-compiler/f18@88c3b1fa128ad262b586619c2ed7cbdbdf8e3f2e
Reviewed-on: https://github.com/flang-compiler/f18/pull/364

[flang] Add CMake rules to install static and shared libraries in
the default install directory or in the directory specified
with CMAKE_INSTALL_PREFIX.  Fixes flang-compiler/f18#359.

Original-commit: flang-compiler/f18@35ce1628e24d85eb5fa8fe467af06f7a33a4d293
Reviewed-on: https://github.com/flang-compiler/f18/pull/364

[flang] Merge pull request flang-compiler/f18#357 from flang-compiler/tsk6

Track current statement location in SemanticsVisitor

Original-commit: flang-compiler/f18@69575f87f2253f178b28755889a29d43193f28c5
Reviewed-on: https://github.com/flang-compiler/f18/pull/357

[flang] Track current statement location in SemanticsVisitor

Change `SemanticsVisitor` to track the location of the current
statement, if any, so that it's available through
`SemanticsContext::location()`

Add overloading of `SemanticsContext::Say()` that reports the
message at the location of the current statement if a `CharBlock`
is not provided.

Original-commit: flang-compiler/f18@5185c721ee9e2da8adcc4cad5a74acc0bf5c8d2d
Reviewed-on: https://github.com/flang-compiler/f18/pull/357

[flang] Merge pull request flang-compiler/f18#360 from flang-compiler/computed-goto

Implement semantics for computed GOTO

Original-commit: flang-compiler/f18@624623a063eda832ea8c6a543bf82d443506c7b5
Reviewed-on: https://github.com/flang-compiler/f18/pull/360

[flang] Removed unused #include files from check-computed-goto.cc.
Did the same for a few other similar files.

Original-commit: flang-compiler/f18@6f7569b93887b32e0b18da42d655e6fde1686e31
Reviewed-on: https://github.com/flang-compiler/f18/pull/360

[flang] Fix typo: "check" becomes "checked"

Original-commit: flang-compiler/f18@2b2b0bf324db2745200b1b82e0a286942adb0c6a
Reviewed-on: https://github.com/flang-compiler/f18/pull/360
Tree-same-pre-rewrite: false

[flang] Implement semantics for computed GOTO.  Note that a PGI extension
will implicitly convert a float to integer (and issue a warning).
This commit does not implement that extension.

Original-commit: flang-compiler/f18@b85755f26fef767850572ef5d3deea87258d87a7
Reviewed-on: https://github.com/flang-compiler/f18/pull/360
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#354 from schweitzpgi/master

FIR: continued development work

Original-commit: flang-compiler/f18@60f4ef672eb1d2a7b7340df916d742d18d4454ae
Reviewed-on: https://github.com/flang-compiler/f18/pull/354

[flang] add comment per Steve's request in review

Original-commit: flang-compiler/f18@c3a5d6a15eca27c25ba1dcd50e3a478228e98eda
Reviewed-on: https://github.com/flang-compiler/f18/pull/354

[flang] Change per Jean's review comment

Original-commit: flang-compiler/f18@9a3a79927bbc2820706398dc2ac03f0eb1c79ad6
Reviewed-on: https://github.com/flang-compiler/f18/pull/354
Tree-same-pre-rewrite: false

[flang] remove use of undefined behavior

Original-commit: flang-compiler/f18@d7c5879f2c86ede4304f98a4e16af6c97b2a09b9
Reviewed-on: https://github.com/flang-compiler/f18/pull/354
Tree-same-pre-rewrite: false

[flang] temporary symbol creation and improve dump routine
check for labels on construct delimiting statements
ifdef out code to avoid warning

Original-commit: flang-compiler/f18@667674aaa08a90f65dd9f0023a157c337f749892
Reviewed-on: https://github.com/flang-compiler/f18/pull/354
Tree-same-pre-rewrite: false

[flang] remove the DO stub instructions

Original-commit: flang-compiler/f18@f1ddcd8d76cce67aa988da8eb356c8d8d93c79a8
Reviewed-on: https://github.com/flang-compiler/f18/pull/354
Tree-same-pre-rewrite: false

[flang] build up expressions implied by DO loop construct

Original-commit: flang-compiler/f18@1e7b9adb62666223662b5445f9303d82be432299
Reviewed-on: https://github.com/flang-compiler/f18/pull/354
Tree-same-pre-rewrite: false

[flang] simplify switch builders

Original-commit: flang-compiler/f18@787ee1fecd275dd2b34171cd165cc38e7c46f8ba
Reviewed-on: https://github.com/flang-compiler/f18/pull/354
Tree-same-pre-rewrite: false

[flang] improved output on flat fir

Original-commit: flang-compiler/f18@9be07963a5f70b71f4e9c38f7d89c837dbedc1a1
Reviewed-on: https://github.com/flang-compiler/f18/pull/354
Tree-same-pre-rewrite: false

[flang] refactor linear representation -> flattened

Original-commit: flang-compiler/f18@4253e2484f15657bff75de5c22947be0c567645a
Reviewed-on: https://github.com/flang-compiler/f18/pull/354
Tree-same-pre-rewrite: false

[flang] replace GenericExprWrapper with Expr<SomeType>

Original-commit: flang-compiler/f18@0821d00cb8b7499a7e98f4f402cf6b7ed29a825d
Reviewed-on: https://github.com/flang-compiler/f18/pull/354
Tree-same-pre-rewrite: false

[flang] FIR: more code cleanup

Original-commit: flang-compiler/f18@eaac944aca994e64d970506c426c222d28e680b5
Reviewed-on: https://github.com/flang-compiler/f18/pull/354
Tree-same-pre-rewrite: false

[flang] Add abstraction layer to fold intrinsic functions with host runtime

Merge pull request flang-compiler/f18#292 from flang-compiler/jpr0

Original-commit: flang-compiler/f18@d24de5513e6f746a539aaded6091759fa54998e4

[flang] Only have cmake look for libpgmath if LIBPGMATH_DIR is given

Original-commit: flang-compiler/f18@1d778f5c1a49c2db15c1fc245ea05bb44eb13295

[flang] fix clang errors and warnings

Original-commit: flang-compiler/f18@410f96384fd8d6652689956cda13147c6cd0c9f4
Tree-same-pre-rewrite: false

[flang] Prepare to be merged with master branch

ActualArgument was modified in the master branch from
a struct to class. In order to compile once merged, this PR
required the related access paterns to be adapted to match
the new ActualArgument.
As a consequence, this PR does not compile anymore on its own,
it needs to be merged with the master branch to work.

Original-commit: flang-compiler/f18@48cdd2ed0ed18b9749f976257c7302e34c20b025
Tree-same-pre-rewrite: false

[flang] Test cases for folding intrinsic function with runtime

Original-commit: flang-compiler/f18@92caee1def0f21b7112565de67a2ec48f326ea07
Tree-same-pre-rewrite: false

[flang] Enable folding of some more intrinsic functions

Enable folding of the following 80 intrinsic functions:

+ Without runtime:

++ Integer:
abs, dim, dshiftl, dshiftr, exponent, iand, ibclr, ibset, ieor, int,
ior, ishft, kind, len, leadz, maskl, maskr, merge_bits, popcnt, poppar,
shifta, shiftl, shiftr, trailz

++ Real:
abs, aimag, aint, dprod, real

+ Complex:
cmplx, conjg

++ Logical:
bge, bgt, ble, blt

+ With Runtime :

+ Real:
acos, acosh, asinh, atan, atan2, atanh, bessel_j0, bessel_j1,
bessel_jn (elemental), bessel_y0, bessel_y1, bessel_yn (elemental),
cos, cosh, erf, erfc, erfc_scaled, exp, gamma, hypot, log, log10,
log_gamma, mod, sin, sqrt, sinh, sqrt, tan, tanh

++ Complex:
acos, acosh, asin, asinh, atan, atanh, cos, cosh, exp, log, sin,
sinh, sqrt, tan, tanh

Original-commit: flang-compiler/f18@7e7d1920f882e7ca22c1320dd9b7e0a3d6eaec28
Tree-same-pre-rewrite: false

[flang] make HostIntrinsicProceduresLibrary a class

Original-commit: flang-compiler/f18@b9f5015d4df0d43a639fe58684291df5665ee585
Tree-same-pre-rewrite: false

[flang] add the possibility to use libpgmath for constant folding

Original-commit: flang-compiler/f18@948a6656277befa60311d38e728c550636cccb5b
Tree-same-pre-rewrite: false

[flang] Map more intrinsic functions to <cmath> functions

Original-commit: flang-compiler/f18@f0f20622116cb0b5b63ae879ca99eccf38dced60
Tree-same-pre-rewrite: false

[flang] Move host floating point environment handling in host.h/host.cc

Original-commit: flang-compiler/f18@0cba8b13089b12f4add5323e9c595e5367ece48e
Tree-same-pre-rewrite: false

[flang] Removed dynamic loading feature for intrinsic folding
After more reflexion, dynamic loading brings to much uncertainty
regarding which library is actually being use for folding.
It is removed to avoid pushing people to use it.
A static linking to libpgmath will be provided in a later commit.

Original-commit: flang-compiler/f18@2161627d2896f06e763848443f61ae9624f03db1
Tree-same-pre-rewrite: false

[flang] fix clang++ linking issue with libm

Original-commit: flang-compiler/f18@805c861bd0c96f2e124fa28664bd7914d9366677
Tree-same-pre-rewrite: false

[flang] renaming to focus scope on intrinsic runtime

Original-commit: flang-compiler/f18@7cfd33b178d3ea3502ea87cb9416720f6cce4ba9
Tree-same-pre-rewrite: false

[flang] made fenv errors internal errors

Original-commit: flang-compiler/f18@f776c8db91d6cd3bee295d73b92f52688d59b362
Tree-same-pre-rewrite: false

[flang] fix signed/unsigned comparison

Original-commit: flang-compiler/f18@46148712e192da9bef7ae406639dcae714fefe1d
Tree-same-pre-rewrite: false

[flang] Limits C++ implementation behaviors

The issue addressed here is the use of cast between object pointers
and function pointers. It is implementation defined because C++,
just like C, does not mandate that function and object pointers
must have the same size.
It is needed to have such cast because it is a will to ba able to
call inside F18 numerical function from libraries linked during
a Fortran program compilation in order to perform folding.
dlopen returns function pointers as void* that need to be cast to
pointer before use.
This change limits the usage of such cast inside ifdefs where POSIX
is required. In POSIX context, such cast is defined. Dlopen is
anyway used only if the environment is POSIX compliant.
In the rest of the code, opaque function pointers have been changed
from void* to void*(*)(). reinterpret_cast from function pointer to
function pointer are standard compliant.

Original-commit: flang-compiler/f18@4b2f29a1289e955469c9b9778a7db0034b0fce70
Tree-same-pre-rewrite: false

[flang] fixed use before init in elemental folding helper

Original-commit: flang-compiler/f18@2cea43ddf94c369ff4446234e880a47ef306d847
Tree-same-pre-rewrite: false

[flang] add support to fold elemental intrisics over arrays

Original-commit: flang-compiler/f18@c2fec22856b9bae7221036173c785d0732c7a7c3
Tree-same-pre-rewrite: false

[flang] answer comments on host/f18 type mappings

Original-commit: flang-compiler/f18@96bce5c4d9348a325a6da30d08c78c56b5a906d3
Tree-same-pre-rewrite: false

[flang] Adds the possibility to use part of libpgmath for folding if it is available

Original-commit: flang-compiler/f18@1c2093ff32bb4867d5024f076151e8b0160c7ede
Tree-same-pre-rewrite: false

[flang] answer some comments

Original-commit: flang-compiler/f18@8161f77f60ee8efb491ace2b9e86d877296f655c
Tree-same-pre-rewrite: false

[flang] Use new indirection layer to host runtime in folding

Original-commit: flang-compiler/f18@e8bb9c52afce3a4e6175bd4b1a3d4641f77491b9
Tree-same-pre-rewrite: false

[flang] Add RTE description structure and indirection layer to host runtime for folding

Original-commit: flang-compiler/f18@329a61405204186d202b1072a17ee068e3d22b15
Tree-same-pre-rewrite: false

[flang] Cherry picking commits from #PR275 and simplifying it
Commit was: Draft of elemental intrinsics function folding

Simplification was made in order to solve conflicts and
to prepare for commit of host math library indirection.

Conflicts:
lib/evaluate/fold.cc

Original-commit: flang-compiler/f18@45678bc44c796509a0d70a079e3912b11ebea2ab
Tree-same-pre-rewrite: false

[flang] Add a utility to safely interact with host types

Original-commit: flang-compiler/f18@32cd789dc2036e888a23e146ff5b251827a1c0c4
Tree-same-pre-rewrite: false

[flang] Merge pull request flang-compiler/f18#356 from flang-compiler/if-semantics

Implement semantic checks for if statements, if constructs and arithmetic ifs.

Original-commit: flang-compiler/f18@87acf05d0bdd438c768b17bd2e5a893616f04978
Reviewed-on: https://github.com/flang-compiler/f18/pull/356

[flang] Inline the constructors for IF semantics checkers.
Remove some leftover cruft from check-if-stmt.h too.

Original-commit: flang-compiler/f18@5c150289a9f48a2fccd15af40d73d4c1e4a0a984
Reviewed-on: https://github.com/flang-compiler/f18/pull/356