Bad comment producing a syntax error in a glslfx file

[lanierd-adsk]

Description of Issue

In https://github.com/PixarAnimationStudios/OpenUSD/blob/2864f3d04f396432f22ec5d6928fc37d34bb4c90/pxr/usdImaging/plugin/usdShaders/shaders/primvarReader.glslfx#L35 There is -- This file is intentionally empty. It should be : // This file is intentionally empty.

Steps to Reproduce

1. For some reason, Hydra tries to compile that empty shader which fails nbecause of this syntax error. I am using a custom GLSLFX under Storm and building in C++ the following network :

   VtValue _CreateHydraCustomColorMaterial(const SdfPath& matPath, const GfVec3f& color)
   {
   HdMaterialNetworkMap networkMap;
   HdMaterialNetwork    network;
   
   //Create our custom GLSLFX shader node
   HdMaterialNode       node;
   node.identifier = _tokens->FVP_CustomColor_Shader;//Identifier of our custom GLSLFX shader
   node.path = matPath;
   // Add the parameters
   node.parameters[_tokens->FVP_CustomColor] = VtValue(GfVec3f(color[0], color[1], color[2]));
   network.nodes.emplace_back(std::move(node));
   
   // Create the UV primvar reader node
   const SdfPath uvPrimvarNodePath = SdfPath(_tokens->uvPrimVarReaderNode);
   HdMaterialNode uvPrimvarNode;
   uvPrimvarNode.path = uvPrimvarNodePath;
   uvPrimvarNode.identifier = UsdImagingTokens->UsdPrimvarReader_float2;
   uvPrimvarNode.parameters[_tokens->varname] = _tokens->st;
   network.nodes.emplace_back(std::move(uvPrimvarNode));
   
   // Insert connection between UV primvar reader node
   // and the material input
   HdMaterialRelationship uvPrimvarRel;
   uvPrimvarRel.inputId = uvPrimvarNodePath;
   uvPrimvarRel.inputName = _tokens->result;
   uvPrimvarRel.outputId = matPath;
   uvPrimvarRel.outputName = _tokens->st;
   network.relationships.emplace_back(std::move(uvPrimvarRel));
   
   networkMap.map.insert({ HdMaterialTerminalTokens->surface, std::move(network) });
   networkMap.terminals.push_back(matPath);
   return VtValue(networkMap);
   }

   Which triggers the compilation of this shader.

System Information (OS, Hardware)

Windows.

Package Versions

Build Flags

[jesschimein]

Filed as internal issue #USD-9810