Revert "[Flang] [FlangRT] Introduce FlangRT project as solution to Flang's runtime LLVM integration"

This reverts commit 6403287eff71a3d6f6c862346d6ed3f0f000eb70.

This is failing on all but 1 of Li

Revert "[Flang] [FlangRT] Introduce FlangRT project as solution to Flang's runtime LLVM integration"

This reverts commit 6403287eff71a3d6f6c862346d6ed3f0f000eb70.

This is failing on all but 1 of Linaro's flang builders.
CMake Error at /home/tcwg-buildbot/worker/clang-aarch64-full-2stage/llvm/flang-rt/unittests/CMakeLists.txt:37 (message):
Target llvm_gtest not found.

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[Flang] [FlangRT] Introduce FlangRT project as solution to Flang's runtime LLVM integration

See discourse thread https://discourse.llvm.org/t/rfc-support-cmake-option-to-control-link-type-built-for-

[Flang] [FlangRT] Introduce FlangRT project as solution to Flang's runtime LLVM integration

See discourse thread https://discourse.llvm.org/t/rfc-support-cmake-option-to-control-link-type-built-for-flang-runtime-libraries/71602/18 for full details.

Flang-rt is the new library target for the flang runtime libraries. It builds the Flang-rt library (which contains the sources of FortranRuntime and FortranDecimal) and the Fortran_main library. See documentation in this patch for detailed description (flang-rt/docs/GettingStarted.md).

This patch aims to:
- integrate Flang's runtime into existing llvm infrasturcture so that Flang's runtime can be built similarly to other runtimes via the runtimes target or via the llvm target as an enabled runtime
- decouple the FortranDecimal library sources that were used by both compiler and runtime so that different build configurations can be applied for compiler vs runtime
- add support for running flang-rt testsuites, which were created by migrating relevant tests from `flang/test` and `flang/unittest` to `flang-rt/test` and `flang-rt/unittest`, using a new `check-flang-rt` target.
- provide documentation on how to build and use the new FlangRT runtime

Reviewed By: DanielCChen

Differential Revision: https://reviews.llvm.org/D154869

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Add version to all LLVM cmake package

Add a version to non-LLVM cmake package so that users needing an exact
version match can use the version parameter to find_package. Also adjust
the find_package

Add version to all LLVM cmake package

Add a version to non-LLVM cmake package so that users needing an exact
version match can use the version parameter to find_package. Also adjust
the find_package(LLVM) to use an exact version match as well.

Reviewed By: arsenm, stellaraccident, mceier

Differential Revision: https://reviews.llvm.org/D138274

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Revert: Add version to all LLVM cmake package

Summary: This reverts commit ad485b71b51168ce13282ae159bd8feff48baf84.

Reviewers:

Subscribers:

Add version to all LLVM cmake package

Add a version to non-LLVM cmake package so that users needing an exact
version match can use the version parameter to find_package. Also adjust
the find_package

Add version to all LLVM cmake package

Add a version to non-LLVM cmake package so that users needing an exact
version match can use the version parameter to find_package. Also adjust
the find_package(LLVM) to use an exact version match as well.

Reviewed By: arsenm, stellaraccident

Differential Revision: https://reviews.llvm.org/D138274

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[cmake] Add support for multiple distributions

LLVM's build system contains support for configuring a distribution, but
it can often be useful to be able to configure multiple distributions
(e.g. if

[cmake] Add support for multiple distributions

LLVM's build system contains support for configuring a distribution, but
it can often be useful to be able to configure multiple distributions
(e.g. if you want separate distributions for the tools and the
libraries). Add this support to the build system, along with
documentation and usage examples.

Reviewed By: phosek

Differential Revision: https://reviews.llvm.org/D89177

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[flang] Fix typo in FlangConfig.cmake.in.

`find_package(Flang)` does not work as there is a missing `@` in the
FlangConfig.cmake.in file. This patch fixes the issue.

Reviewed By: thopre

Differenti

[flang] Fix typo in FlangConfig.cmake.in.

`find_package(Flang)` does not work as there is a missing `@` in the
FlangConfig.cmake.in file. This patch fixes the issue.

Reviewed By: thopre

Differential Revision: https://reviews.llvm.org/D96484

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[flang] A rework of the cmake build components for in and out of tree builds.

In general all the basic functionality seems to work and removes some redundancy
and more complicated features in favor

[flang] A rework of the cmake build components for in and out of tree builds.

In general all the basic functionality seems to work and removes some redundancy
and more complicated features in favor of borrowing infrastructure from LLVM
build configurations. Here's a quick summary of details and remaining issues:

* Testing has spanned Ubuntu 18.04 & 19.10, CentOS 7, RHEL 8, and
MacOS/darwin. Architectures include x86_64 and Arm. Without
access to Window nothing has been tested there yet.

* As we change file and directory naming schemes (i.e.,
capitalization) some odd things can occur on MacOS systems with
case preserving but not case senstive file system configurations.
Can be painful and certainly something to watch out for as any
any such changes continue.

* Testing infrastructure still needs to be tuned up and worked on.
Note that there do appear to be cases of some tests hanging (on
MacOS in particular). They appear unrelated to the build
process.

* Shared library configurations need testing (and probably fixing).

* Tested both standalone and 'in-mono repo' builds. Changes for
supporting the mono repo builds will require LLVM-level changes that
are straightforward when the time comes.

* The configuration contains a work-around for LLVM's C++ standard mode
passing down into Flang/F18 builds (i.e., LLVM CMake configuration would
force a -std=c++11 flag to show up in command line arguments. The
current configuration removes that automatically and is more strict in
following new CMake guidelines for enforcing C++17 mode across all the
CMake files.

* Cleaned up a lot of repetition in the command line arguments. It
is likely that more work is still needed to both allow for
customization and working around CMake defailts (or those
inherited from LLVM's configuration files). On some platforms agressive
optimization flags (e.g. -O3) can actually break builds due to the inlining
of templates in .cpp source files that then no longer are available for use
cases outside those source files (shows up as link errors). Sticking at -O2
appears to fix this. Currently this CMake configuration forces this in
release mode but at the cost of stomping on any CMake, or user customized,
settings for the release flags.

* Made the lit tests non-source directory dependent where appropriate. This is
done by configuring certain test shell files to refer to the correct paths
whether an in or out of tree build is being performed. These configured
files are output in the build directory. A %B substitution is introduced in
lit to refer to the build directory, mirroring the %S substitution for the
source directory, so that the tests can refer to the configured shell scripts.

Co-authored-by: David Truby <david.truby@arm.com>

Original-commit: flang-compiler/f18@d1c7184159b2d3c542a8f36c58a0c817e7506845
Reviewed-on: https://github.com/flang-compiler/f18/pull/1045

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[flang] Revert "Schauveau cmake"

Original-commit: flang-compiler/f18@be33dc182a9bcfa664095886ca62b3b1db4eb797
Reviewed-on: https://github.com/flang-compiler/f18/pull/7

[flang] Add new global CMakefile infrastructure with examples

Original-commit: flang-compiler/f18@81b91f327052cd0596e96af9c33b2d0e221d10f5
Reviewed-on: https://github.com/flang-compiler/f18/pull/6
T

[flang] Add new global CMakefile infrastructure with examples

Original-commit: flang-compiler/f18@81b91f327052cd0596e96af9c33b2d0e221d10f5
Reviewed-on: https://github.com/flang-compiler/f18/pull/6
Tree-same-pre-rewrite: false

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