Cleanup CMake generation warnings

Warnings related to the `add_custom_command` calls that did not have
commands, but were being just used to output messages.

Instead, these messages are being output via the CMake -E echo command
as the final command in the original targets.

Author: StableCoder

code-coverage.cmake

@@ -465,17 +465,12 @@ function(target_code_coverage TARGET_NAME)
             ${GENHTML_PATH} -o
             ${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/${target_code_coverage_COVERAGE_TARGET_NAME}
             ${COVERAGE_INFO}
+          COMMAND
+            ${CMAKE_COMMAND} -E echo
+            "Open ${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/${target_code_coverage_COVERAGE_TARGET_NAME}/index.html in your browser to view the coverage report."
           DEPENDS ccov-capture-${target_code_coverage_COVERAGE_TARGET_NAME})
       endif()
 
-      add_custom_command(
-        TARGET ccov-${target_code_coverage_COVERAGE_TARGET_NAME}
-        POST_BUILD
-        COMMAND ;
-        COMMENT
-          "Open ${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/${target_code_coverage_COVERAGE_TARGET_NAME}/index.html in your browser to view the coverage report."
-      )
-
       # AUTO
       if(target_code_coverage_AUTO)
         if(NOT TARGET ccov)
@@ -692,16 +687,10 @@ function(add_code_coverage_all_targets)
         ccov-all
         COMMAND ${GENHTML_PATH} -o ${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/all-merged
                 ${COVERAGE_INFO} -p ${CMAKE_SOURCE_DIR}
+        COMMAND
+          ${CMAKE_COMMAND} -E echo
+          "Open ${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/all-merged/index.html in your browser to view the coverage report."
         DEPENDS ccov-all-capture)
-
     endif()
-
-    add_custom_command(
-      TARGET ccov-all
-      POST_BUILD
-      COMMAND ;
-      COMMENT
-        "Open ${CMAKE_COVERAGE_OUTPUT_DIRECTORY}/all-merged/index.html in your browser to view the coverage report."
-    )
   endif()
 endfunction()

dependency-graph.cmake

@@ -86,13 +86,9 @@ function(gen_dep_graph OUTPUT_TYPE)
       COMMAND
         ${DOT_EXE} -T${OUTPUT_TYPE}
         ${CMAKE_CURRENT_BINARY_DIR}/graphviz/${TARGET_NAME}.dot -o
-        ${OUT_DIR}/${TARGET_NAME}.${OUTPUT_TYPE})
-
-    add_custom_command(
-      TARGET ${TARGET_NAME}
-      POST_BUILD
-      COMMAND ;
-      COMMENT
+        ${OUT_DIR}/${TARGET_NAME}.${OUTPUT_TYPE}
+      COMMAND
+        ${CMAKE_COMMAND} -E echo
         "Dependency graph for ${TARGET_NAME} generated and located at ${OUT_DIR}/${TARGET_NAME}.${OUTPUT_TYPE}"
     )