Fix #2298.

The AST has two precisions, an operation precision and a result precision.
Actual use of GLSL with mediump samplers wants the result precision, so
pick that up instead of the operation precision.

CMake: Error on unresolved symbols

Remove root kokoro/linux-*-cmake configs

Fixed GCC -Wunused-parameter in hlslParseables.cpp.

Warnings before fix:

[3/7] Building CXX object glslang/CMakeFiles/glslang.dir/HLSL/hlslParseables.cpp.o
../glslang/HLSL/hlslParseables.cpp: In function ‘bool {anonymous}::IsValid(const char*, char, char, char, char, int, int)’:
../glslang/HLSL/hlslParseables.cpp:334:45: warning: unused parameter ‘retOrder’ [-Wunused-parameter]
  334 | inline bool IsValid(const char* cname, char retOrder, char retType, char argOrder, char argType, int dim0, int dim1)
      |                                        ~~~~~^~~~~~~~
../glslang/HLSL/hlslParseables.cpp:334:60: warning: unused parameter ‘retType’ [-Wunused-parameter]
  334 | inline bool IsValid(const char* cname, char retOrder, char retType, char argOrder, char argType, int dim0, int dim1)
      |                                                       ~~~~~^~~~~~~
../glslang/HLSL/hlslParseables.cpp:334:89: warning: unused parameter ‘argType’ [-Wunused-parameter]
  334 | inline bool IsValid(const char* cname, char retOrder, char retType, char argOrder, char argType, int dim0, int dim1)
      |                                                                                    ~~~~~^~~~~~~
../glslang/HLSL/hlslParseables.cpp:334:112: warning: unused parameter ‘dim1’ [-Wunused-parameter]
  334 | inline bool IsValid(const char* cname, char retOrder, char retType, char argOrder, char argType, int dim0, int dim1)
      |                                                                                                            ~~~~^~~~

Issue: #1484

These have been superseded by the `static` and `shared` variants in the respective subdirectories.

Issue: #2283

Kokoro: Split linux cmake cfgs into static/shared

Fix #2293: Get correct RelaxedPrecision settings for various ways of passing arguments to formal parameters.

When arguments are copied to make space for a writable formal parameter,
and the formal parameter is relaxed precision, make the copy also
relaxed precision.

Track whether formal parameters declare reduced precision and match
that with arguments, and if they differ, make a copy to promote the
precision.

Allows for testing of generation of both static libraries and shared objects.

The old configs are staying in place until I'm confident everything is working correctly.

Issues: #1421, #1484, #2283

Fixed msvc 2019 nmake compiler warnings with RTTI.

By default cmake generates cxx_flags with `/GR` parameter.
I updated CMAKE_CXX_FLAGS string and replaced `/GR` -> `/GR-`

How to reproduce:

Visual Studio 2019 x64 command port

mkdir build-msvc2019
cd build-msvc2019
cmake -G"NMake Makefiles" -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_LIBDIR=install ..
nmake

COMPILATION BEFORE:

Scanning dependencies of target OSDependent
[  1%] Building CXX object glslang/OSDependent/Windows/CMakeFiles/OSDependent.dir/ossource.cpp.obj
cl : Command line warning D9025 : overriding '/GR' with '/GR-'
ossource.cpp
[  3%] Linking CXX static library OSDependent.lib
[  3%] Built target OSDependent
Scanning dependencies of target OGLCompiler
[  4%] Building CXX object OGLCompilersDLL/CMakeFiles/OGLCompiler.dir/InitializeDll.cpp.obj
cl : Command line warning D9025 : overriding '/GR' with '/GR-'
InitializeDll.cpp
[  6%] Linking CXX static library OGLCompiler.lib
[  6%] Built target OGLCompiler
Scanning dependencies of target glslang
[  7%] Building CXX object glslang/CMakeFiles/glslang.dir/MachineIndependent/glslang_tab.cpp.obj
cl : Command line warning D9025 : overriding '/GR' with '/GR-'
glslang_tab.cpp
[  9%] Building CXX object glslang/CMakeFiles/glslang.dir/MachineIndependent/attribute.cpp.obj
cl : Command line warning D9025 : overriding '/GR' with '/GR-'

FLAGS BEFORE:

-- CMAKE_C_FLAGS:   /DWIN32 /D_WINDOWS /W3
-- CMAKE_CXX_FLAGS: /DWIN32 /D_WINDOWS /W3 /GR /EHsc
-- CMAKE_CXX_FLAGS_DEBUG:   /MDd /Zi /Ob0 /Od /RTC1
-- CMAKE_CXX_FLAGS_RELEASE: /MD /O2 /Ob2 /DNDEBUG

COMPILATION AFTER:

[  1%] Building CXX object glslang/OSDependent/Windows/CMakeFiles/OSDependent.dir/ossource.cpp.obj
ossource.cpp
[  3%] Linking CXX static library OSDependent.lib
[  3%] Built target OSDependent
[  4%] Building CXX object OGLCompilersDLL/CMakeFiles/OGLCompiler.dir/InitializeDll.cpp.obj
InitializeDll.cpp
[  6%] Linking CXX static library OGLCompiler.lib
[  6%] Built target OGLCompiler
[  7%] Building CXX object glslang/CMakeFiles/glslang.dir/MachineIndependent/glslang_tab.cpp.obj
glslang_tab.cpp
[  9%] Building CXX object glslang/CMakeFiles/glslang.dir/MachineIndependent/attribute.cpp.obj

FLAGS AFTER:

-- CMAKE_C_FLAGS:   /DWIN32 /D_WINDOWS /W3
-- CMAKE_CXX_FLAGS: /DWIN32 /D_WINDOWS /W3 /GR- /EHsc
-- CMAKE_CXX_FLAGS_DEBUG:   /MDd /Zi /Ob0 /Od /RTC1
-- CMAKE_CXX_FLAGS_RELEASE: /MD /O2 /Ob2 /DNDEBUG

Use OpFUnordNotEqual for floating-point !=

Updating the SPIR-V generator version number changes the output of all
the SPIR-V tests.

Change to 10 to reflect the change to generating unordered !=
operations.

The normal IEEE not equal operation tests whether operands are unordered
or not equal (so comparison with a NaN returns true). This corresponds
to the SPIR-V OpFUnordNotEqual, so change to using that.

Add -g0 command line argument

Add more Kokoro configurations

gnustl_static is no longer supported.

Analogous to gcc, -g0 would strip all debug info.  This is done
regardless of whether optimizations are enabled.
Signed-off-by: Shahbaz Youssefi <ShabbyX@gmail.com>

Move hlsl/ source to glslang/HLSL/

Now that the HLSL source files are part of the `glslang` target (#2271), it makes sense for these to sit in the `glslang` directory.

Changed the case of the directory from `hlsl` to `HLSL` to better match the sibling directories.

Untangle build target cyclic dependencies (approach #2)

... and stub the HLSL target.

Fixes the building of shared libraries.

This breaks the cyclic dependency between the `glslang` and `hlsl` targets (by essentially removing the `hlsl` target).

The `BUILD.gn` and `BUILD.bazel` build rules already pull the `HLSL` source into the `glslang` target.

`Android.mk` is the only remaining build config that has a dedicated `HLSL` target, but this is explicity static and does not suffer the same link-time issues with the cyclic dependency (we may wish to stub this target too).

Related issue: #1484, #2147
Related PR: #2267

The `isMat` variable is no longer used in the HLSL parser. Removed.

Related to PR #2265.

This breaks a cyclic dependency between the SPIRV and glslang build targets.