diff --git a/src/Magnum/Shaders/DistanceFieldVector.h b/src/Magnum/Shaders/DistanceFieldVector.h
index dd5d665a8..a6c452aa1 100644
--- a/src/Magnum/Shaders/DistanceFieldVector.h
+++ b/src/Magnum/Shaders/DistanceFieldVector.h
@@ -55,7 +55,18 @@ be shared among multiple draw calls and thus are provided in a separate
 */
 struct DistanceFieldVectorDrawUniform {
     /** @brief Construct with default parameters */
-    constexpr explicit DistanceFieldVectorDrawUniform(DefaultInitT = DefaultInit) noexcept: materialId{0} {}
+    constexpr explicit DistanceFieldVectorDrawUniform(DefaultInitT = DefaultInit) noexcept:
+        #if ((defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)) && defined(CORRADE_TARGET_BIG_ENDIAN)
+        _pad0{}, /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        materialId{0}
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        #ifndef CORRADE_TARGET_BIG_ENDIAN
+        , _pad0{}
+        #endif
+        , _pad1{}, _pad2{}, _pad3{}
+        #endif
+        {}
 
     /** @brief Construct without initializing the contents */
     explicit DistanceFieldVectorDrawUniform(NoInitT) noexcept {}
@@ -101,19 +112,39 @@ struct DistanceFieldVectorDrawUniform {
     /* warning: Member __pad0__ is not documented. FFS DOXYGEN WHY DO YOU THINK
        I MADE THOSE UNNAMED, YOU DUMB FOOL */
     #ifndef DOXYGEN_GENERATING_OUTPUT
-    UnsignedShort:16; /* reserved for skinOffset */
+    UnsignedShort
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad0 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :16; /* reserved for skinOffset */
     #endif
     #else
-    UnsignedShort:16; /* reserved for skinOffset */
+    UnsignedShort
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad0 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :16; /* reserved for skinOffset */
     UnsignedShort materialId;
     #endif
 
     /* warning: Member __pad1__ is not documented. FFS DOXYGEN WHY DO YOU THINK
        I MADE THOSE UNNAMED, YOU DUMB FOOL */
     #ifndef DOXYGEN_GENERATING_OUTPUT
-    Int:32; /* reserved for objectId */
-    Int:32;
-    Int:32;
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad1 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32; /* reserved for objectId */
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad2 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32;
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad3 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32;
     #endif
 };
 
@@ -127,7 +158,16 @@ Describes material properties referenced from
 */
 struct DistanceFieldVectorMaterialUniform {
     /** @brief Construct with default parameters */
-    constexpr explicit DistanceFieldVectorMaterialUniform(DefaultInitT = DefaultInit) noexcept: color{1.0f, 1.0f, 1.0f, 1.0f}, outlineColor{0.0f, 0.0f, 0.0f, 0.0f}, outlineStart{0.5f}, outlineEnd{1.0f}, smoothness{0.04f} {}
+    constexpr explicit DistanceFieldVectorMaterialUniform(DefaultInitT = DefaultInit) noexcept: color{1.0f, 1.0f, 1.0f, 1.0f},
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        /* Otherwise it refuses to constexpr, on 3.8 at least */
+        _pad0{}, _pad1{}, _pad2{}, _pad3{},
+        #endif
+        outlineColor{0.0f, 0.0f, 0.0f, 0.0f}, outlineStart{0.5f}, outlineEnd{1.0f}, smoothness{0.04f}
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        , _pad4{}
+        #endif
+        {}
 
     /** @brief Construct without initializing the contents */
     explicit DistanceFieldVectorMaterialUniform(NoInitT) noexcept: color{NoInit}, outlineColor{NoInit} {}
@@ -193,10 +233,26 @@ struct DistanceFieldVectorMaterialUniform {
     /* warning: Member __pad0__ is not documented. FFS DOXYGEN WHY DO YOU THINK
        I MADE THOSE UNNAMED, YOU DUMB FOOL */
     #ifndef DOXYGEN_GENERATING_OUTPUT
-    Int:32; /* reserved for backgroundColor */
-    Int:32;
-    Int:32;
-    Int:32;
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad0 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32; /* reserved for backgroundColor */
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad1 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32;
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad2 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32;
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad3 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32;
     #endif
 
     /**
@@ -241,7 +297,11 @@ struct DistanceFieldVectorMaterialUniform {
     /* warning: Member __pad4__ is not documented. FFS DOXYGEN WHY DO YOU THINK
        I MADE THOSE UNNAMED, YOU DUMB FOOL */
     #ifndef DOXYGEN_GENERATING_OUTPUT
-    Int:32;
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad4 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32;
     #endif
 };
 
diff --git a/src/Magnum/Shaders/Flat.h b/src/Magnum/Shaders/Flat.h
index f11ea91e1..e5bef400b 100644
--- a/src/Magnum/Shaders/Flat.h
+++ b/src/Magnum/Shaders/Flat.h
@@ -52,7 +52,16 @@ each draw call. Texture transformation, if needed, is supplied separately in a
 */
 struct FlatDrawUniform {
     /** @brief Construct with default parameters */
-    constexpr explicit FlatDrawUniform(DefaultInitT = DefaultInit) noexcept: color{1.0f, 1.0f, 1.0f, 1.0f}, objectId{0}, alphaMask{0.5f} {}
+    constexpr explicit FlatDrawUniform(DefaultInitT = DefaultInit) noexcept: color{1.0f, 1.0f, 1.0f, 1.0f}, objectId{0},
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        /* Otherwise it refuses to constexpr, on 3.8 at least */
+        _pad0{}, _pad1{},
+        #endif
+        alphaMask{0.5f}
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        , _pad2{}
+        #endif
+        {}
 
     /** @brief Construct without initializing the contents */
     explicit FlatDrawUniform(NoInitT) noexcept: color{NoInit} {}
@@ -128,11 +137,27 @@ struct FlatDrawUniform {
     /* This field is an UnsignedInt in the shader and skinOffset is extracted
        as (value >> 16), so the order has to be different on BE */
     #ifndef CORRADE_TARGET_BIG_ENDIAN
-    UnsignedShort:16;
-    UnsignedShort:16; /* reserved for skinOffset */
+    UnsignedShort
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad0 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :16;
+    UnsignedShort
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad1 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :16; /* reserved for skinOffset */
     #else
-    UnsignedShort:16; /* reserved for skinOffset */
-    UnsignedShort:16;
+    UnsignedShort
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad0 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :16; /* reserved for skinOffset */
+    UnsignedShort
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad1 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :16;
     #endif
     #endif
 
@@ -150,7 +175,11 @@ struct FlatDrawUniform {
     /* warning: Member __pad2__ is not documented. FFS DOXYGEN WHY DO YOU THINK
        I MADE THOSE UNNAMED, YOU DUMB FOOL */
     #ifndef DOXYGEN_GENERATING_OUTPUT
-    Int:32;
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad2 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32;
     #endif
 };
 
diff --git a/src/Magnum/Shaders/Generic.h b/src/Magnum/Shaders/Generic.h
index c7f73a340..9322b1054 100644
--- a/src/Magnum/Shaders/Generic.h
+++ b/src/Magnum/Shaders/Generic.h
@@ -374,7 +374,12 @@ Used only if @ref DistanceFieldVectorGL::Flag::TextureTransformation,
 */
 struct TextureTransformationUniform {
     /** @brief Construct with default parameters */
-    constexpr explicit TextureTransformationUniform(DefaultInitT = DefaultInit) noexcept: rotationScaling{Math::IdentityInit} {}
+    constexpr explicit TextureTransformationUniform(DefaultInitT = DefaultInit) noexcept: rotationScaling{Math::IdentityInit}
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        /* Otherwise it refuses to constexpr, on 3.8 at least */
+        , _pad0{}, _pad1{}
+        #endif
+        {}
     /** @brief Construct without initializing the contents */
     explicit TextureTransformationUniform(NoInitT) noexcept: rotationScaling{NoInit}, offset{NoInit} {}
 
@@ -447,8 +452,16 @@ struct TextureTransformationUniform {
     /* warning: Member __pad0__ is not documented. FFS DOXYGEN WHY DO YOU THINK
        I MADE THOSE UNNAMED, YOU DUMB FOOL */
     #ifndef DOXYGEN_GENERATING_OUTPUT
-    Int:32; /* reserved for layer */
-    Int:32; /* reserved for coordinateSet */
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad0 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32; /* reserved for layer */
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad1 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32; /* reserved for coordinateSet */
     #endif
 };
 
diff --git a/src/Magnum/Shaders/MeshVisualizer.h b/src/Magnum/Shaders/MeshVisualizer.h
index 85463592c..2441daae1 100644
--- a/src/Magnum/Shaders/MeshVisualizer.h
+++ b/src/Magnum/Shaders/MeshVisualizer.h
@@ -54,7 +54,18 @@ separate @ref MeshVisualizerMaterialUniform structure, referenced by
 */
 struct MeshVisualizerDrawUniform2D {
     /** @brief Construct with default parameters */
-    constexpr explicit MeshVisualizerDrawUniform2D(DefaultInitT = DefaultInit) noexcept: materialId{0} {}
+    constexpr explicit MeshVisualizerDrawUniform2D(DefaultInitT = DefaultInit) noexcept:
+        #if ((defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)) && defined(CORRADE_TARGET_BIG_ENDIAN)
+        _pad0{}, /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        materialId{0}
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        #ifndef CORRADE_TARGET_BIG_ENDIAN
+        , _pad0{}
+        #endif
+        , _pad1{}, _pad2{}, _pad3{}
+        #endif
+        {}
 
     /** @brief Construct without initializing the contents */
     explicit MeshVisualizerDrawUniform2D(NoInitT) noexcept {}
@@ -100,19 +111,39 @@ struct MeshVisualizerDrawUniform2D {
     /* warning: Member __pad0__ is not documented. FFS DOXYGEN WHY DO YOU THINK
        I MADE THOSE UNNAMED, YOU DUMB FOOL */
     #ifndef DOXYGEN_GENERATING_OUTPUT
-    UnsignedShort:16; /* reserved for skinOffset */
+    UnsignedShort
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad0 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :16; /* reserved for skinOffset */
     #endif
     #else
-    UnsignedShort:16; /* reserved for skinOffset */
+    UnsignedShort
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad0 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :16; /* reserved for skinOffset */
     UnsignedShort materialId;
     #endif
 
     /* warning: Member __pad1__ is not documented. FFS DOXYGEN WHY DO YOU THINK
        I MADE THOSE UNNAMED, YOU DUMB FOOL */
     #ifndef DOXYGEN_GENERATING_OUTPUT
-    Int:32;
-    Int:32;
-    Int:32;
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad1 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32;
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad2 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32;
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad3 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32;
     #endif
 };
 
@@ -128,7 +159,18 @@ shared among multiple draw calls and thus are provided in a separate
 */
 struct MeshVisualizerDrawUniform3D {
     /** @brief Construct with default parameters */
-    constexpr explicit MeshVisualizerDrawUniform3D(DefaultInitT = DefaultInit) noexcept: normalMatrix{Math::IdentityInit}, materialId{0} {}
+    constexpr explicit MeshVisualizerDrawUniform3D(DefaultInitT = DefaultInit) noexcept: normalMatrix{Math::IdentityInit}
+        #if ((defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)) && defined(CORRADE_TARGET_BIG_ENDIAN)
+        , _pad0{} /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        , materialId{0}
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        #ifndef CORRADE_TARGET_BIG_ENDIAN
+        , _pad0{}
+        #endif
+        , _pad1{}, _pad2{}, _pad3{}
+        #endif
+        {}
 
     /** @brief Construct without initializing the contents */
     explicit MeshVisualizerDrawUniform3D(NoInitT) noexcept: normalMatrix{NoInit} {}
@@ -194,19 +236,39 @@ struct MeshVisualizerDrawUniform3D {
     /* warning: Member __pad0__ is not documented. FFS DOXYGEN WHY DO YOU THINK
        I MADE THOSE UNNAMED, YOU DUMB FOOL */
     #ifndef DOXYGEN_GENERATING_OUTPUT
-    UnsignedShort:16; /* reserved for skinOffset */
+    UnsignedShort
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad0 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :16; /* reserved for skinOffset */
     #endif
     #else
-    UnsignedShort:16; /* reserved for skinOffset */
+    UnsignedShort
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad0 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :16; /* reserved for skinOffset */
     UnsignedShort materialId;
     #endif
 
     /* warning: Member __pad1__ is not documented. FFS DOXYGEN WHY DO YOU THINK
        I MADE THOSE UNNAMED, YOU DUMB FOOL */
     #ifndef DOXYGEN_GENERATING_OUTPUT
-    Int:32;
-    Int:32;
-    Int:32;
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad1 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32;
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad2 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32;
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad3 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32;
     #endif
 };
 
@@ -220,7 +282,12 @@ Describes material properties referenced from
 */
 struct MeshVisualizerMaterialUniform {
     /** @brief Construct with default parameters */
-    constexpr explicit MeshVisualizerMaterialUniform(DefaultInitT = DefaultInit) noexcept: color{1.0f, 1.0f, 1.0f, 1.0f}, wireframeColor{0.0f, 0.0f, 0.0f, 1.0f}, wireframeWidth{1.0f}, colorMapOffset{1.0f/512.0f}, colorMapScale{1.0f/256.0f}, lineWidth{1.0f}, lineLength{1.0f}, smoothness{2.0f} {}
+    constexpr explicit MeshVisualizerMaterialUniform(DefaultInitT = DefaultInit) noexcept: color{1.0f, 1.0f, 1.0f, 1.0f}, wireframeColor{0.0f, 0.0f, 0.0f, 1.0f}, wireframeWidth{1.0f}, colorMapOffset{1.0f/512.0f}, colorMapScale{1.0f/256.0f}, lineWidth{1.0f}, lineLength{1.0f}, smoothness{2.0f}
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        /* Otherwise it refuses to constexpr, on 3.8 at least */
+        , _pad0{}, _pad1{}
+        #endif
+        {}
 
     /** @brief Construct without initializing the contents */
     explicit MeshVisualizerMaterialUniform(NoInitT) noexcept: color{NoInit}, wireframeColor{NoInit} {}
@@ -432,8 +499,16 @@ struct MeshVisualizerMaterialUniform {
     /* warning: Member __pad0__ is not documented. FFS DOXYGEN WHY DO YOU THINK
        I MADE THOSE UNNAMED, YOU DUMB FOOL */
     #ifndef DOXYGEN_GENERATING_OUTPUT
-    Int:32;
-    Int:32;
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad0 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32;
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad1 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32;
     #endif
 };
 
diff --git a/src/Magnum/Shaders/Phong.h b/src/Magnum/Shaders/Phong.h
index 8252f62e9..c315e171d 100644
--- a/src/Magnum/Shaders/Phong.h
+++ b/src/Magnum/Shaders/Phong.h
@@ -55,7 +55,15 @@ separate @ref PhongMaterialUniform structure, referenced by @ref materialId.
 */
 struct PhongDrawUniform {
     /** @brief Construct with default parameters */
-    constexpr explicit PhongDrawUniform(DefaultInitT = DefaultInit) noexcept: normalMatrix{Math::IdentityInit}, materialId{0}, objectId{0}, lightOffset{0}, lightCount{0xffffffffu} {}
+    constexpr explicit PhongDrawUniform(DefaultInitT = DefaultInit) noexcept: normalMatrix{Math::IdentityInit},
+        #if ((defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)) && defined(CORRADE_TARGET_BIG_ENDIAN)
+        _pad0{}, /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        materialId{0},
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8) && !defined(CORRADE_TARGET_BIG_ENDIAN)
+        _pad0{},
+        #endif
+        objectId{0}, lightOffset{0}, lightCount{0xffffffffu} {}
 
     /** @brief Construct without initializing the contents */
     explicit PhongDrawUniform(NoInitT) noexcept: normalMatrix{NoInit} {}
@@ -144,10 +152,18 @@ struct PhongDrawUniform {
     /* warning: Member __pad0__ is not documented. FFS DOXYGEN WHY DO YOU THINK
        I MADE THOSE UNNAMED, YOU DUMB FOOL */
     #ifndef DOXYGEN_GENERATING_OUTPUT
-    UnsignedShort:16; /* reserved for skinOffset */
+    UnsignedShort
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad0 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :16; /* reserved for skinOffset */
     #endif
     #else
-    UnsignedShort:16; /* reserved for skinOffset */
+    UnsignedShort
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad0 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :16; /* reserved for skinOffset */
     UnsignedShort materialId;
     #endif
 
@@ -195,7 +211,11 @@ Describes material properties referenced from
 */
 struct PhongMaterialUniform {
     /** @brief Construct with default parameters */
-    constexpr explicit PhongMaterialUniform(DefaultInitT = DefaultInit) noexcept: ambientColor{0.0f, 0.0f, 0.0f, 0.0f}, diffuseColor{1.0f, 1.0f, 1.0f, 1.0f}, specularColor{1.0f, 1.0f, 1.0f, 0.0f}, normalTextureScale{1.0f}, shininess{80.0f}, alphaMask{0.5f} {}
+    constexpr explicit PhongMaterialUniform(DefaultInitT = DefaultInit) noexcept: ambientColor{0.0f, 0.0f, 0.0f, 0.0f}, diffuseColor{1.0f, 1.0f, 1.0f, 1.0f}, specularColor{1.0f, 1.0f, 1.0f, 0.0f}, normalTextureScale{1.0f}, shininess{80.0f}, alphaMask{0.5f}
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        , _pad0{} /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        {}
 
     /** @brief Construct without initializing the contents */
     explicit PhongMaterialUniform(NoInitT) noexcept: ambientColor{NoInit}, diffuseColor{NoInit}, specularColor{NoInit} {}
@@ -345,7 +365,11 @@ struct PhongMaterialUniform {
     /* warning: Member __pad0__ is not documented. FFS DOXYGEN WHY DO YOU THINK
        I MADE THOSE UNNAMED, YOU DUMB FOOL */
     #ifndef DOXYGEN_GENERATING_OUTPUT
-    Int:32;
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad0 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32;
     #endif
 };
 
@@ -359,7 +383,19 @@ and @ref PhongDrawUniform::lightCount range.
 */
 struct PhongLightUniform {
     /** @brief Construct with default parameters */
-    constexpr explicit PhongLightUniform(DefaultInitT = DefaultInit) noexcept: position{0.0f, 0.0f, 1.0f, 0.0f}, color{1.0f, 1.0f, 1.0f}, specularColor{1.0f, 1.0f, 1.0f}, range{Constants::inf()} {}
+    constexpr explicit PhongLightUniform(DefaultInitT = DefaultInit) noexcept: position{0.0f, 0.0f, 1.0f, 0.0f}, color{1.0f, 1.0f, 1.0f},
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad0{}, /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        specularColor{1.0f, 1.0f, 1.0f},
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad1{},
+        #endif
+        range{Constants::inf()}
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        , _pad2{}, _pad3{}, _pad4{}
+        #endif
+        {}
     /** @brief Construct without initializing the contents */
     explicit PhongLightUniform(NoInitT) noexcept: position{NoInit}, color{NoInit}, specularColor{NoInit} {}
 
@@ -436,7 +472,11 @@ struct PhongLightUniform {
     /* warning: Member __pad0__ is not documented. FFS DOXYGEN WHY DO YOU THINK
        I MADE THOSE UNNAMED, YOU DUMB FOOL */
     #ifndef DOXYGEN_GENERATING_OUTPUT
-    Int:32; /* reserved for cone inner angle */
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad0 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32; /* reserved for cone inner angle */
     #endif
 
     /**
@@ -452,7 +492,11 @@ struct PhongLightUniform {
     /* warning: Member __pad1__ is not documented. FFS DOXYGEN WHY DO YOU THINK
        I MADE THOSE UNNAMED, YOU DUMB FOOL */
     #ifndef DOXYGEN_GENERATING_OUTPUT
-    Int:32; /* reserved for cone outer angle */
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad1 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32; /* reserved for cone outer angle */
     #endif
 
     /**
@@ -466,9 +510,21 @@ struct PhongLightUniform {
     /* warning: Member __pad2__ is not documented. FFS DOXYGEN WHY DO YOU THINK
        I MADE THOSE UNNAMED, YOU DUMB FOOL */
     #ifndef DOXYGEN_GENERATING_OUTPUT
-    Int:32; /* reserved for cone direction */
-    Int:32;
-    Int:32;
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad2 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32; /* reserved for cone direction */
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad3 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32;
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad4 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32;
     #endif
 };
 
diff --git a/src/Magnum/Shaders/Vector.h b/src/Magnum/Shaders/Vector.h
index f110efbfb..f45ce9df5 100644
--- a/src/Magnum/Shaders/Vector.h
+++ b/src/Magnum/Shaders/Vector.h
@@ -52,7 +52,12 @@ each draw call. Texture transformation, if needed, is supplied separately in a
 */
 struct VectorDrawUniform {
     /** @brief Construct with default parameters */
-    constexpr explicit VectorDrawUniform(DefaultInitT = DefaultInit) noexcept: color{1.0f, 1.0f, 1.0f, 1.0f}, backgroundColor{0.0f, 0.0f, 0.0f, 0.0f} {}
+    constexpr explicit VectorDrawUniform(DefaultInitT = DefaultInit) noexcept: color{1.0f, 1.0f, 1.0f, 1.0f}, backgroundColor{0.0f, 0.0f, 0.0f, 0.0f}
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        /* Otherwise it refuses to constexpr, on 3.8 at least */
+        , _pad0{}, _pad1{}, _pad2{}, _pad3{}, _pad4{}
+        #endif
+        {}
 
     /** @brief Construct without initializing the contents */
     explicit VectorDrawUniform(NoInitT) noexcept: color{NoInit}, backgroundColor{NoInit} {}
@@ -110,15 +115,43 @@ struct VectorDrawUniform {
     /* This field is an UnsignedInt in the shader and skinOffset is extracted
        as (value >> 16), so the order has to be different on BE */
     #ifndef CORRADE_TARGET_BIG_ENDIAN
-    UnsignedShort:16;
-    UnsignedShort:16; /* reserved for skinOffset */
+    UnsignedShort
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad0 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :16;
+    UnsignedShort
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad1 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :16; /* reserved for skinOffset */
     #else
-    UnsignedShort:16; /* reserved for skinOffset */
-    UnsignedShort:16;
+    UnsignedShort
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad0 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :16; /* reserved for skinOffset */
+    UnsignedShort
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad1 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :16;
     #endif
-    Int:32; /* reserved for objectId */
-    Int:32; /* reserved for alphaMask */
-    Int:32;
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad2 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32; /* reserved for objectId */
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad3 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32; /* reserved for alphaMask */
+    Int
+        #if (defined(CORRADE_TARGET_CLANG) && __clang_major__ < 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ < 8)
+        _pad4 /* Otherwise it refuses to constexpr, on 3.8 at least */
+        #endif
+        :32;
     #endif
 };