Enable emscripten builds to compile slang.dll to WebAssembly. (#5131)

* Compile fixes for Wasm

The issues are all are due to 'long' types being 32 bits on WASM.

- class members redeclared errors
- << with StringBuilder and unsigned long is ambiguous

This helps to address issue #5115.

* Use the host executable suffix for generators

Since the generators are run at build-time, we should not use CMAKE_EXECUTABLE_SUFFIX,
which is the suffix for the target platform.
Instead, define CMAKE_HOST_EXECUTABLE_SUFFIX as appropriate, and use that suffix instead.

This helps to address issue #5115.

* Add support for Wasm as a platform

This helps to address issue #5115.

* Add emscripten build

This closes #5115.

1 files changed, 1 insertions, 1 deletions

diff --git a/source/slang/slang-parameter-binding.cpp b/source/slang/slang-parameter-binding.cpp
index 115ccc55e..ea22cbcba 100644
--- a/source/slang/slang-parameter-binding.cpp
+++ b/source/slang/slang-parameter-binding.cpp
@@ -3748,7 +3748,7 @@ static void _appendRange(Index start, LayoutSize size, StringBuilder& ioBuf)
         ioBuf << "[ " << start << " ... ";
         if (size.isFinite())
         {
-            ioBuf << start + size.getFiniteValue() << ")";
+            ioBuf << start + (Index)size.getFiniteValue() << ")";
         }
         else
         {