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The `.elf` extension is a common convention used for embedded binaries.
Both Arm and RISC-V use the ELF file format for executables.
Configuring the `.elf` file extension is typically done incorrectly.
Most embedded developers set this in toolchain files, which is not
the correct place.
This is typically accomplished through a hack by setting the individual
language file extensions for C, CXX, and ASM.
Multiple CMake issues in the past have been opened related to this.

* #16538
* #20163
* #17880

A platform module makes it simpler and less error prone for developers
targeting these ubiquitous bare-metal platforms.
This PR attempts to solve this globally with a generic platform.
This could also be solved by using more specific platform modules, such
as one for each of bare-metal Arm and RISC-V.

Jörg Bornemann authored Jan 21, 2020 and Brad King committed Jan 28, 2020

Introduce the function cmReadGccDepfile that parses a GCC-style depfile
and returns its content. The implementation uses a lexer that is
modeled after the re2c implementation in Ninja.

The sample files of the autotest have been created with gcc 8.3.0.

This depfile reader is to be used by the Autogen facility to make use
of the depfiles that are generated by Qt's meta object compiler.

This module is inspired by one from KDE's KWin.

Frederik Gladhorn authored Sep 27, 2018 and Brad King committed Oct 11, 2018

This module is inspired by one from KDE's KWin.

Patrick Stotko authored May 11, 2018 and Brad King committed May 15, 2018

Previously the command did not allow naming targets on the LHS that
were not created in the calling directory.  Lift this restriction to
enable more flexible use by projects.

Fixes: #17943

Kitware Robot authored Jan 09, 2018 and Brad King committed Jan 09, 2018

Code extracted from:

    https://gitlab.kitware.com/utils/kwiml.git

at commit 9c2d6caecd8cd937b891009c681f90748df85dfd (master).

Upstream Shortlog
-----------------

Brad King (5):
      fc9d607a Use static_cast when compiling as C++
      ea9336bc Update copyright year
      7db8b884 Suppress MSVC static_cast warnings in verification and test code
      340af24d Update copyright year
      9c2d6cae Fix compilation on Borland C++ 5.8

Richard W.M. Jones (1):
      6fc81d88 abi.h: Update RISC-V support for revised macro names

Tom Fogal authored Jun 08, 2017 and Brad King committed Sep 25, 2017

Find GLVND components if available.  Add `GLX` and `EGL` options for
COMPONENTS that allow requesting these libraries explicitly.  Introduce
new import targets for these windowing-system-specific libraries.

On a GLVND system, populate the legacy `OPENGL_LIBRARIES` variable and
the `OpenGL::GL` target using the `OpenGL` and `GLX` components.  On
non-GLVND systems, continue to use the legacy `GL` library and simply do
not provide the GLVND components.  Application code can choose to adapt
based on the availability of GLVND components as imported targets.

Michael Stürmer authored Sep 04, 2017 and Brad King committed Sep 05, 2017

Use the same environment variable for the initial flags that we
use for the compiler id.

Fixes: #17250

Adriaan de Groot authored Feb 12, 2017 and Brad King committed Jun 10, 2017

Adds an option CPACK_ENABLE_FREEBSD_PKG to allow CPack to look
for FreeBSD's libpkg / pkg(8). If this is set and the libpkg
headers and library are found (which they will be, by default,
on any FreeBSD system), then add a FreeBSD pkg(8) generator.

The FreeBSD package tool pkg(8) uses tar.xz files (.txz) with two
metadata files embedded (+MANIFEST and +COMPACT_MANIFEST).
This introduces a bunch of FreeBSD-specific CPACK_FREEBSD_PACKAGE_*
variables for filling in the metadata; the Debian generator does
something similar. Documentation for the CPack CMake-script is styled
after the Debian generator.

Implementation notes:
 - Checks for libpkg -- the underlying implementation for pkg(8) --
   and includes FreeBSD package-generation if building CMake on
   a UNIX host. Since libpkg can be used on BSDs, Linux and OSX,
   this potentially adds one more packaging format. In practice,
   this will only happen on FreeBSD and DragonflyBSD.
 - Copy-paste from cmCPack...

Alexey Sokolov authored Dec 21, 2016 and Brad King committed Jan 10, 2017

Issue: #4147

Kitware Robot authored Nov 09, 2016 and Brad King committed Nov 09, 2016

Code extracted from:

    http://public.kitware.com/KWSys.git

at commit 18c654114de3aa65429542f95308720bc68f9231 (master).

Upstream Shortlog
-----------------

Brad King (14):
      37306a1c FStream: Quiet unused argument warning
      15e90a3c Sort includes to stabilize include order w.r.t. clang-format
      26509227 Copyright.txt: Add notice of copyright by contributors
      fc42d3f2 Add temporary script to filter license notices
      c41c1bc4 Simplify KWSys per-source license notices
      1d4c0b4a Remove temporary script that filtered license notices
      a4f5ef79 SystemInformation: Remove stray comment
      8649a886 kwsysPrivate: Protect KWSYS_HEADER macro from clang-format
      89b98af5 Configure clang-format for KWSys source tree
      547dacad Add a script to run clang-format on the entire source tree
      aa94be0c CONTRIBUTING: Add a section on coding style
      6604c4b6 Empty commit at end of history preceding clang-format style transition
      2b3e2b1c Tell Git to not export 'clang-format' infrastructure
      18c65411 FStream: Include Configure.hxx before other headers

Kitware Robot (1):
      6c973b46 Revise C++ coding style using clang-format

We do not require copyright assignment for contributions to CMake.
Update the top-level notice to mention "Contributors" explicitly.
Add a list of the Contributors whose names already appear in
source-level copyright notices.  Find the list with the command:

    $ git grep -h 'Copyright[^.]' -- *.* \
        Auxiliary Modules Packaging Source Templates Tests \
      | grep -v Kitware | sed 's/^#\? *//' | sort | uniq

Manually refine the list to de-duplicate entries and filter out
notices from third-party code.

Kitware Robot authored Sep 08, 2016 and Brad King committed Sep 08, 2016

Code extracted from:

    https://gitlab.kitware.com/utils/kwiml.git

at commit d564b3c71a6dcec9b1cd84afb498b14a69307780 (master).

Upstream Shortlog
-----------------

Brad King (1):
      d564b3c7 Update copyright year

Richard W.M. Jones (1):
      12f000d5 abi.h: Add RISC-V, a little-endian architecture.

Kitware Robot authored Dec 09, 2015 and Brad King committed Dec 17, 2015

Code extracted from:

    https://github.com/Kitware/KWIML.git

at commit 43f9f8d0b0c8ee62aa056a2020981a6d98a40dd4 (master).

Use 'grep' to extract the copyright notice from Copyright.txt instead of
duplicating it in the bootstrap script.

Kitware Robot authored May 02, 2012 and Brad King committed Oct 01, 2012

Extract upstream KWSys using the following shell code.

$ sha1=719638e233b560afb0d9a0afdcf23469dc1827fe &&
git archive --prefix=KWSys-snapshot/ $sha1 |
tar x

Provides header files that use preprocessor tests to detect and provide
information about the compiler and its target architecture.  The headers
contain no configuration-time test results and thus may be installed
into an architecture-independent include directory.  This makes them
suitable for use in the public interface of any package.

This converts the CMake license to a pure 3-clause OSI-approved BSD
License.  We drop the previous license clause requiring modified
versions to be plainly marked.  We also update the CMake copyright to
cover the full development time range.

ENH: SUBDIR_DEPENDS command now does nothing.  The parallel build functionality is now automatic.  Dependencies are setup to force the same build order as a single threaded build, but multiple files in the same directory can be built simultaneously.  Also fixed bug with inheriting CMakeLists.txt files when a directory level is skipped.

ENH: change InitialPass to take a const reference to the argument string, to avoid changes to the file cache

ENH: Added SUBDIR_DEPENDS command and corresponding support code.  This command allows specification that a set of subdirectories be built before a particular directory.