Configuring WebAssembly Module's Build Properties

Each WebAssembly module is a project that has build properties assigned to it. The most important of them are described here.

To access the build properties of a WebAssembly module, right-click the module and select "Properties".

Build Environment

To view the build environment properties, expand the "C/C++ Build" section in the "Properties" dialog window and click "Environment".

Figure 1. Build Environment Properties

Figure 1. Build Environment Properties

The following environment variables can be modified in the WebAssembly build:

Table 1: Build Environment Variables
Variable Description
EMCC_SKIP_SANITY_CHECK Disables or enables various sanity checks done by the Samsung Emscripten SDK
EMCC_WASM_BACKEND In the current Samsung Emscripten SDK version, this value must be set to '0'. If you use another Samsung Emscripten SDK version, you can change the value if you encounter build errors such as:

error: unknown target triple 'asmjs-unknown-emscripten', please use -triple or -arch

or

shared:ERROR: emcc: WASM_BACKEND selected but could not find lld (wasm-ld): ...
EM_CACHE The "Cache directory" value you set when configuring the Emscripten SDK is copied here on each build
EM_CONFIG The "Configuration file" path you set when configuring the Samsung Emscripten SDK is copied here on each build
PATH Paths of the Samsung Emscripten SDK binary tools are prepended to this PATH variable
WASM_TOOLS_POSTFIX Must be set to ".bat" on Windows®, empty on other operating systems

Build Settings

To view the build settings properties, expand the "C/C++ Build" section in the "Properties" dialog window and click "Settings".

Figure 2. Build Settings Properties

Figure 2. Build Settings Properties

The following tabs are customized to support building WebAssembly modules:

  • "Tool Settings" tab is used for setting compilation and linking flags. In particular you can define include and library search paths and add libraries to link to.

  • "Build Artifact" tab defines the artifact details. By default, the artifact name is set to be the same as the WebAssembly module project name and the artifact extension is set to "js". Do not change the extension, since it can break the build.