Getting shaders to compile on mac? Shaderc trying to use HLSL for Metal shaders?

[furrz]

Hey there, I'm trying to build a simple BGFX application on macOS using the vcpkg-packaged version of bgfx.
No matter what flags I try, though, I can't quite work out how to compile simple shaders. I think it's user error, rather than a bug in your application, so I'm putting it in discussions and hoping someone knows what I'm messing up!

If I run, for example:

cmake-build-debug/vcpkg_installed/arm64-osx/tools/bgfx/shaderc -f shaders/fs.sc 
-o fs --type f --profile metal --platform osx

on this source file, fs.sc:

$input v_color0
#include <bgfx_shader.sh>

void main()
{
	gl_FragColor = v_color0;
}

I'm left with a load of errors relating to... HLSL??? Shouldn't it be using MSL?

(Additionally, the bgfx_shader.sh include that almost every example seems to use, and which is listed as the solution to a similar issue here, does not seem to be present in the include path?)

cpp: "shaders/fs.sc", line 75: Warning: Cannot open include file "bgfx_shader.sh"
Code:
---
      1: // shaderc command line:
      2: // cmake-build-debug/vcpkg_installed/arm64-osx/tools/bgfx/shaderc -f shaders/fs.sc -o fs --type f --profile metal --platform osx
      3: 
      4: void main( float4 gl_FragCoord : SV_POSITION , float4 v_color0 : COLOR0 , out float4 bgfx_FragData0 : SV_TARGET0 )
      5: {
      6: float4 bgfx_VoidFrag = vec4_splat(0.0);

>>>   7: bgfx_FragData0 = v_color0;
>>>   0: ^

      8: }
---
ERROR: 0:6: 'vec4_splat' : no matching overloaded function found 
ERROR: 0:6: 'declaration' : Expected 
(6): error at column 39, HLSL parsing failed.
ERROR: 3 compilation errors.  No code generated.


Failed to build shader.

[furrz]

My mistake, I didn't realize bgfx_shader.sc is installed in BGFX's include path, which needs to be manually pointed to.