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, 2 insertions, 2 deletions

diff --git a/source/slang/slang-ast-dump.cpp b/source/slang/slang-ast-dump.cpp
index a1ab7a5c8..b3a554e6d 100644
--- a/source/slang/slang-ast-dump.cpp
+++ b/source/slang/slang-ast-dump.cpp
@@ -304,9 +304,9 @@ struct ASTDumpContext
 
     void dump(uint32_t v)
     {
-        m_writer->emit(UInt(v));
+        m_writer->emit((uint64_t)v);
     }
-    void dump(UInt v)
+    void dump(uint64_t v)
     {
         m_writer->emit(v);
     }