Fixes

src/Magnum/GL/AbstractShaderProgram.h

@@ -1699,7 +1699,7 @@ class MAGNUM_GL_EXPORT AbstractShaderProgram: public AbstractObject {
         static MAGNUM_GL_LOCAL void cleanLogImplementationAngle(std::string& message);
         #endif
 
-        static MAGNUM_GL_LOCAL void completionStatusImplementationFallback(GLuint, GLenum, GLint*);
+        static MAGNUM_GL_LOCAL APIENTRY void completionStatusImplementationFallback(GLuint, GLenum, GLint*);
 
         MAGNUM_GL_LOCAL static void use(GLuint id);
         void use();

src/Magnum/GL/Implementation/ShaderProgramState.h

@@ -47,7 +47,9 @@ struct ShaderProgramState {
     void(AbstractShaderProgram::*transformFeedbackVaryingsImplementation)(Containers::ArrayView<const std::string>, AbstractShaderProgram::TransformFeedbackBufferMode);
     #endif
     void(*cleanLogImplementation)(std::string&);
-    void(*completionStatusImplementation)(GLuint, GLenum, GLint* value);
+    /* This is a direct pointer to a GL function, so needs a __stdcall on
+       Windows to compile properly on 32 bits */
+    void(APIENTRY *completionStatusImplementation)(GLuint, GLenum, GLint* value);
 
     #ifndef MAGNUM_TARGET_WEBGL
     void(APIENTRY *uniform1fvImplementation)(GLuint, GLint, GLsizei, const GLfloat*);

src/Magnum/GL/Implementation/ShaderState.h

@@ -53,7 +53,9 @@ struct ShaderState {
 
     void(Shader::*addSourceImplementation)(std::string);
     void(*cleanLogImplementation)(std::string&);
-    void(*completionStatusImplementation)(GLuint, GLenum, GLint* value);
+    /* This is a direct pointer to a GL function, so needs a __stdcall on
+       Windows to compile properly on 32 bits */
+    void(APIENTRY *completionStatusImplementation)(GLuint, GLenum, GLint* value);
 
     GLint maxVertexOutputComponents,
         maxFragmentInputComponents;

src/Magnum/GL/Shader.h

@@ -680,7 +680,7 @@ class MAGNUM_GL_EXPORT Shader: public AbstractObject {
         static MAGNUM_GL_LOCAL void cleanLogImplementationIntelWindows(std::string& message);
         #endif
 
-        static MAGNUM_GL_LOCAL void completionStatusImplementationFallback(GLuint, GLenum, GLint*);
+        static MAGNUM_GL_LOCAL APIENTRY void completionStatusImplementationFallback(GLuint, GLenum, GLint*);
 
         Type _type;
         GLuint _id;

src/Magnum/Shaders/DistanceFieldVectorGL.cpp

@@ -166,8 +166,6 @@ template<UnsignedInt dimensions> DistanceFieldVectorGL<dimensions>::DistanceFiel
     if (id() == 0) return;
 
     CORRADE_INTERNAL_ASSERT_OUTPUT(checkLink());
-    CORRADE_INTERNAL_ASSERT_OUTPUT(cs._vert.checkCompile());
-    CORRADE_INTERNAL_ASSERT_OUTPUT(cs._frag.checkCompile());
 
     const GL::Context& context = GL::Context::current();
     const GL::Version version = cs._version;

src/Magnum/Shaders/FlatGL.cpp

@@ -241,8 +241,6 @@ template<UnsignedInt dimensions> FlatGL<dimensions>::FlatGL(CompileState&& cs):
     if (id() == 0) return;
 
     CORRADE_INTERNAL_ASSERT_OUTPUT(checkLink());
-    CORRADE_INTERNAL_ASSERT_OUTPUT(cs._vert.checkCompile());
-    CORRADE_INTERNAL_ASSERT_OUTPUT(cs._frag.checkCompile());
 
     const GL::Context& context = GL::Context::current();
     const GL::Version version = cs._version;

src/Magnum/Shaders/VectorGL.cpp

@@ -168,8 +168,6 @@ template<UnsignedInt dimensions> VectorGL<dimensions>::VectorGL(CompileState&& c
     if (id() == 0) return;
 
     CORRADE_INTERNAL_ASSERT_OUTPUT(checkLink());
-    CORRADE_INTERNAL_ASSERT_OUTPUT(cs._vert.checkCompile());
-    CORRADE_INTERNAL_ASSERT_OUTPUT(cs._frag.checkCompile());
 
     const GL::Context& context = GL::Context::current();
     const GL::Version version = cs._version;

src/Magnum/Shaders/VertexColorGL.cpp

@@ -146,8 +146,6 @@ template<UnsignedInt dimensions> VertexColorGL<dimensions>::VertexColorGL(Compil
     if (id() == 0) return;
 
     CORRADE_INTERNAL_ASSERT_OUTPUT(checkLink());
-    CORRADE_INTERNAL_ASSERT_OUTPUT(cs._vert.checkCompile());
-    CORRADE_INTERNAL_ASSERT_OUTPUT(cs._frag.checkCompile());
 
     const GL::Context& context = GL::Context::current();
     const GL::Version version = cs._version;