package/ci: enable everything that has GL optional in the Vulkan build.

So we use that build to verify the project can compile with GL turned
off, not just that the Vulkan parts can compile.

package/ci/unix-desktop-vulkan.sh

@@ -17,11 +17,12 @@ cmake .. \
 ninja install
 cd ../..
 
-# Enabling only stuff that's directly affected by Vulkan (which means also
-# parts of Platform, which need Trade for icon import in tests), disabling
-# everything else. On Linux this uses a newer GCC because SwiftShader doesn't
-# compile on 4.8; building of Vulkan Magnum code on GCC 4.8 is tested in the
-# combined GL + Vulkan job.
+# Enabling only libraries that have opt-in GL or Vulkan functionality (and thus
+# should be tested to compile w/ MAGNUM_TARGET_GL disabled), plus dependencies
+# of what's directly affected by Vulkan (which means also Trade for icon import
+# in Platform tests), disabling everything else. On Linux this uses a newer GCC
+# because SwiftShader doesn't compile on 4.8; building of Vulkan Magnum code on
+# GCC 4.8 is tested in the combined GL + Vulkan job.
 #
 # Not using CXXFLAGS in order to avoid affecting dependencies.
 mkdir build && cd build
@@ -37,13 +38,14 @@ cmake .. \
     -DMAGNUM_WITH_DEBUGTOOLS=ON \
     -DMAGNUM_WITH_GL=OFF \
     -DMAGNUM_WITH_MATERIALTOOLS=OFF \
-    -DMAGNUM_WITH_MESHTOOLS=OFF \
-    -DMAGNUM_WITH_PRIMITIVES=OFF \
+    -DMAGNUM_WITH_MESHTOOLS=ON \
+    `# Needed by MeshTools tests` \
+    -DMAGNUM_WITH_PRIMITIVES=ON \
     -DMAGNUM_WITH_SCENEGRAPH=OFF \
     -DMAGNUM_WITH_SCENETOOLS=OFF \
-    -DMAGNUM_WITH_SHADERS=OFF \
-    -DMAGNUM_WITH_TEXT=OFF \
-    -DMAGNUM_WITH_TEXTURETOOLS=OFF \
+    -DMAGNUM_WITH_SHADERS=ON \
+    -DMAGNUM_WITH_TEXT=ON \
+    -DMAGNUM_WITH_TEXTURETOOLS=ON \
     -DMAGNUM_WITH_TRADE=ON \
     -DMAGNUM_WITH_VK=ON \
     -DMAGNUM_WITH_AL_INFO=OFF \
@@ -73,8 +75,15 @@ cmake .. \
     -DMAGNUM_BUILD_VK_TESTS=ON \
     -DMAGNUM_BUILD_DEPRECATED=$BUILD_DEPRECATED \
     -G Ninja
+
 ninja $NINJA_JOBS
 
+# The GL library shouldn't get built by accident
+if ls Debug/lib/libMagnumGL*; then
+    echo "The MagnumGL library was built even though it shouldn't"
+    false
+fi
+
 export VK_ICD_FILENAMES=$HOME/swiftshader/share/vulkan/icd.d/vk_swiftshader_icd.json
 export CORRADE_TEST_COLOR=ON