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Compilers such as MSVC and IAR may have variants that target different
architectures.  We have been using a `MSVC_<LANG>_ARCHITECTURE_ID`
variable to hold this information for MSVC.  Add an alternative with a
more general name (later we can port MSVC to it too).

This additional information may be needed to generate proper invocations
of the compiler based on its architecture variant.

We already do this for other languages like C and CXX.

GNU is not a vendor of IAR.

When `<LANG>_STANDARD` is not set we will not add any language standard
flags.  If `<LANG>_EXTENSIONS` is not OFF then our default is supposed
to be ON.  In order to support compilers that do not enable their
extensions by default, check a `CMAKE_<LANG>_EXTENSION_COMPILE_OPTION`
variable for an extensions flag to use without any language standard.
Suggested-by: Norbert Lange <nolange79@gmail.com>

420e4844 Help/dev: Update maintainer guide with note about docs and tests
Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !1000

974f4333 VS: Fix support for rc /nologo flag in per-source COMPILE_FLAGS
Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !998

5d317930 Android: Fix include path for unified headers
Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !997

3b754215 VS: Improve workaround for CUDA -Xcompiler placement bug
f2059585 VS: Fix target_compile_options for CUDA
Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !996

fff782f6 Tests: Simplify CUDA rpath on macOS
Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !995

0db4c7a0 Tests: Verify registry value is not "/registry" before using
Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !994

51865fc6 Vs: allow CSharp targets to be linked to CXX targets
Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !993

Since commit v3.9.0-rc1~160^2 (VS: Use tool-specific flag table for
COMPILE_FLAGS parsing, 2017-05-03) we now correctly use the `rc` flag
table to process the COMPILE_FLAGS flags of `.rc` source files instead
of incorrectly using the `cl` flag table as before.  However, our `rc`
flag table is not complete.  The `/nologo` flag was working before only
by accident because the `cl` flag table entry for it happened to match.
Add the proper entry to the `rc` flag table.

Fixes: #16991

In commit v3.9.0-rc3~3^2 (Android: Add support for unified headers,
2017-06-12) we accidentally constructed the unified header include
directories from the linking sysroot.  Construct them from the
compiling sysroot instead.

Fixes: #16584

In commit v3.9.0-rc1~431^2~6 (VS: Place CUDA host compiler options in
proper project file fields, 2017-03-07) we worked around a bug in the
CUDA VS integration by dropping `AdditionalCompilerOptions`.  However,
this silently drops `-Xcompiler=` options given by the user that don't
map to one of CudaCompile's dedicated settings.  Improve the workaround
to instead put the remaining `AdditionalCompilerOptions` into the
`AdditionalOptions` field behind `-Xcompiler=` ourselves.

Fix the VS generator to honor `COMPILE_OPTIONS` for CUDA.  The exclusion
added by commit v3.9.0-rc1~431^2~7 (VS: Do not pass CUDA compile options
to C compiler, 2017-03-07) was correct but we need additional logic to
pass the CUDA compile options to the CUDA compiler.  Also we should
still pass the CXX or C options to MSVC (ClCompile) when those languages
are enabled even if the link language is CUDA.

Use the `BUILD_RPATH` property and reference the CMake-computed location
of the runtime libraries.

Fixes: #17002

50b3837c Autogen: Q_OBJECT behind brace test
01d2b745 Autogen: Check for Q_OBJECT/Q_GADGET after brace
Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !986

72ccb9f4 CheckTypeSize: Add support for arm architectures
Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !989

f94213a1 Help: Update 3.9 release notes with recommended CUDA version for VS
Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !990

d5afb178 expat: Fix compilation on systems without stdint.h
0a40c668 Merge branch 'upstream-expat' into update-expat
4b8a8c22 expat 2017-06-17 (c4446687)
d9d191a1 expat: Update script to get Expat 2.2.1
Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !987

Fixes: #16755