modules: Glslang, you're the reason PEOPLE HATE BUILDSYSTEMS.

Confuckinggratulations, you managed to split the project into even more
tiny useless badly named libraries! Yes, it's amazing that such a
generic name like /usr/lib/libMachineIndependent.a is actually glslang,
who would have thought! All the developers who ever got their hands on
glslang and didn't cancel the whole project immediately upon seeing this
horror should get retroactively fired. FFS.

modules/FindGlslang.cmake

@@ -117,13 +117,21 @@ endif()
 if(CORRADE_TARGET_WINDOWS OR _GLSLANG_IS_STATIC)
     # ARE YOU MAD?! Why the fuck can't you put everything into a single lib FFS
     set(_GLSLANG_STATIC_LIBRARIES HLSL OSDependent OGLCompiler)
-    # For FPHSA
+    # Update 2021-06-19: WHAT THE FUCK, why do you keep adding new fucking
+    # libs?! https://github.com/KhronosGroup/glslang/pull/2301 Also, why such a
+    # huge breaking change is not even hinted in the 11.0 changelog?!
+    set(_GLSLANG_STATIC_LIBRARIES_11 GenericCodeGen MachineIndependent)
+    # For FPHSA, except the libraries that got added in glslang 11 -- we'll
+    # treat them as optional, if they are there, we link them, if not, we
+    # assume it's version 10 or older.
     set(_GLSLANG_EXTRA_LIBRARIES )
-    foreach(_library ${_GLSLANG_STATIC_LIBRARIES})
+    foreach(_library ${_GLSLANG_STATIC_LIBRARIES} ${_GLSLANG_STATIC_LIBRARIES_11})
         find_library(Glslang_${_library}_LIBRARY_DEBUG NAMES ${_library}d)
         find_library(Glslang_${_library}_LIBRARY_RELEASE NAMES ${_library})
         select_library_configurations(Glslang_${_library})
-        list(APPEND _GLSLANG_EXTRA_LIBRARIES Glslang_${_library}_LIBRARY)
+        if(_library IN_LIST _GLSLANG_STATIC_LIBRARIES)
+            list(APPEND _GLSLANG_EXTRA_LIBRARIES Glslang_${_library}_LIBRARY)
+        endif()
     endforeach()
 else()
     set(_GLSLANG_STATIC_LIBRARIES )
@@ -145,9 +153,10 @@ find_package_handle_standard_args(Glslang DEFAULT_MSG
 mark_as_advanced(FORCE Glslang_INCLUDE_DIR)
 
 # Except for SPIRV these are all optional because needed only in a static
-# build, which is impossible to detect. And SPIRV was checked to be present in
-# the FPHSA above, so it's guaranteed to be present.
-foreach(_library SPIRV ${_GLSLANG_STATIC_LIBRARIES})
+# build, which is impossible to detect (and some are present only in newer
+# versions, FFS). And SPIRV was checked to be present in the FPHSA above, so
+# it's guaranteed to be present.
+foreach(_library SPIRV ${_GLSLANG_STATIC_LIBRARIES} ${_GLSLANG_STATIC_LIBRARIES_11})
     if(Glslang_${_library}_LIBRARY AND NOT TARGET Glslang::${_library})
         add_library(Glslang::${_library} UNKNOWN IMPORTED)
         if(Glslang_${_library}_LIBRARY_RELEASE)
@@ -216,4 +225,13 @@ if(NOT TARGET Glslang::Glslang)
         set_property(TARGET Glslang::Glslang APPEND PROPERTY
             INTERFACE_LINK_LIBRARIES Glslang::OGLCompiler)
     endif()
+    # These two are new in 11.0, so link them only if they exist
+    if((_GLSLANG_IS_STATIC OR CORRADE_TARGET_WINDOWS) AND TARGET Glslang::GenericCodeGen)
+        set_property(TARGET Glslang::Glslang APPEND PROPERTY
+            INTERFACE_LINK_LIBRARIES Glslang::GenericCodeGen)
+    endif()
+    if((_GLSLANG_IS_STATIC OR CORRADE_TARGET_WINDOWS) AND TARGET Glslang::MachineIndependent)
+        set_property(TARGET Glslang::Glslang APPEND PROPERTY
+            INTERFACE_LINK_LIBRARIES Glslang::MachineIndependent)
+    endif()
 endif()