Fix the ASSERT error

src/compiler/translator/Compiler.cpp

@@ -671,7 +671,7 @@ bool TCompiler::checkAndSimplifyAST(TIntermBlock *root,
                 return false;
             }
         }
-        if (compileOptions & SH_INIT_OUTPUT_VARIABLES)
+        if ((compileOptions & SH_INIT_OUTPUT_VARIABLES) && (shaderType != GL_COMPUTE_SHADER))
         {
             initializeOutputVariables(root);
         }

src/libANGLE/renderer/gl/ShaderGL.cpp

@@ -51,7 +51,7 @@ ShCompileOptions ShaderGL::prepareSourceAndReturnOptions(const gl::Context *cont
     ShCompileOptions options = SH_INIT_GL_POSITION;
 
     bool isWebGL = context->getExtensions().webglCompatibility;
-    if (isWebGL)
+    if (isWebGL && (mData.getShaderType() != gl::ShaderType::Compute))
     {
         options |= SH_INIT_OUTPUT_VARIABLES;
     }

src/tests/compiler_tests/ShCompile_test.cpp

@@ -38,19 +38,48 @@ class ShCompileTest : public testing::Test
 
     void testCompile(const char **shaderStrings, int stringCount, bool expectation)
     {
-        ShCompileOptions options      = SH_OBJECT_CODE;
+        ShCompileOptions options      = SH_OBJECT_CODE | SH_VARIABLES | SH_INIT_OUTPUT_VARIABLES;
         bool success                  = sh::Compile(mCompiler, shaderStrings, stringCount, options);
         const std::string &compileLog = sh::GetInfoLog(mCompiler);
         EXPECT_EQ(expectation, success) << compileLog;
     }
 
-  private:
     ShBuiltInResources mResources;
 
   public:
     ShHandle mCompiler;
 };
 
+class ShCompileComputeTest : public ShCompileTest
+{
+  public:
+    ShCompileComputeTest() {}
+
+  protected:
+    void SetUp() override
+    {
+        sh::InitBuiltInResources(&mResources);
+        mCompiler = sh::ConstructCompiler(GL_COMPUTE_SHADER, SH_WEBGL3_SPEC,
+                                          SH_GLSL_COMPATIBILITY_OUTPUT, &mResources);
+        ASSERT_TRUE(mCompiler != nullptr) << "Compiler could not be constructed.";
+    }
+};
+
+// Test calling sh::Compile with compute shader source string.
+TEST_F(ShCompileComputeTest, ComputeShaderString)
+{
+    constexpr char kComputeShaderString[] =
+        R"(#version 310 es
+        layout(local_size_x=1) in;
+        void main()
+        {
+        })";
+
+    const char *shaderStrings[] = {kComputeShaderString};
+
+    testCompile(shaderStrings, 1, true);
+}
+
 // Test calling sh::Compile with more than one shader source string.
 TEST_F(ShCompileTest, MultipleShaderStrings)
 {