Replace comments with a note in EXCLUDE_FROM_LIBMLIR doc

Author: mgorny

mlir/cmake/modules/AddMLIR.cmake

@@ -305,7 +305,9 @@ endfunction()
 # EXCLUDE_FROM_LIBMLIR
 #   Don't include this library in libMLIR.so.  This option should be used
 #   for test libraries, executable-specific libraries, or rarely used libraries
-#   with large dependencies.
+#   with large dependencies.  When using it, please link libraries included
+#   in libMLIR via mlir_target_link_libraries(), to ensure that the library
+#   does not pull in static dependencies when MLIR_LINK_MLIR_DYLIB=ON is used.
 # OBJECT
 #   The library's object library is referenced using "obj.${name}". For this to
 #   work reliably, this flag ensures that the OBJECT library exists.

mlir/test/lib/Analysis/CMakeLists.txt

@@ -23,10 +23,6 @@ add_mlir_library(MLIRTestAnalysis
   LINK_LIBS PUBLIC
   MLIRTestDialect
   )
-
-# Since this library is excluded from libMLIR, link it to the dylib
-# to ensure that it can be used in flang without implicitly pulling in
-# static libraries.
 mlir_target_link_libraries(MLIRTestAnalysis PUBLIC
   MLIRAffineDialect
   MLIRAnalysis

mlir/test/lib/Dialect/Test/CMakeLists.txt

@@ -69,10 +69,6 @@ add_mlir_library(MLIRTestDialect
   MLIRTestOpsSyntaxIncGen
   MLIRTestOpsShardGen
   )
-
-# Since this library is excluded from libMLIR, link it to the dylib
-# to ensure that it can be used in flang without implicitly pulling in
-# static libraries.
 mlir_target_link_libraries(MLIRTestDialect PUBLIC
   MLIRControlFlowInterfaces
   MLIRDataLayoutInterfaces

mlir/test/lib/IR/CMakeLists.txt

@@ -28,10 +28,6 @@ add_mlir_library(MLIRTestIR
 
   EXCLUDE_FROM_LIBMLIR
   )
-
-# Since this library is excluded from libMLIR, link it to the dylib
-# to ensure that it can be used in flang without implicitly pulling in
-# static libraries.
 mlir_target_link_libraries(MLIRTestIR PUBLIC
   MLIRPass
   MLIRBytecodeReader