cmake: Explicitly specify generators that support Coverage functionality

Only the "Ninja Multi-Config" generator supports an `EXCLUDE_FROM_ALL`
target property value that varies by configuration.

Author: hebasto

CMakeLists.txt

@@ -156,20 +156,27 @@ else()
 endif()
 
 # Define custom "Coverage" build type.
-set(CMAKE_C_FLAGS_COVERAGE "${CMAKE_C_FLAGS_RELWITHDEBINFO} -O0 -DCOVERAGE=1 --coverage" CACHE STRING
-  "Flags used by the C compiler during \"Coverage\" builds."
-)
-set(CMAKE_EXE_LINKER_FLAGS_COVERAGE "${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO} --coverage" CACHE STRING
-  "Flags used for linking binaries during \"Coverage\" builds."
-)
-set(CMAKE_SHARED_LINKER_FLAGS_COVERAGE "${CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO} --coverage" CACHE STRING
-  "Flags used by the shared libraries linker during \"Coverage\" builds."
-)
-mark_as_advanced(
-  CMAKE_C_FLAGS_COVERAGE
-  CMAKE_EXE_LINKER_FLAGS_COVERAGE
-  CMAKE_SHARED_LINKER_FLAGS_COVERAGE
-)
+# The list of default build targets depends on whether they are being built for coverage.
+# This functionality is limited to generators that support it.
+if(CMAKE_GENERATOR MATCHES "Make|Ninja")
+  set(CMAKE_C_FLAGS_COVERAGE "${CMAKE_C_FLAGS_RELWITHDEBINFO} -O0 -DCOVERAGE=1 --coverage" CACHE STRING
+    "Flags used by the C compiler during \"Coverage\" builds."
+  )
+  set(CMAKE_EXE_LINKER_FLAGS_COVERAGE "${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO} --coverage" CACHE STRING
+    "Flags used for linking binaries during \"Coverage\" builds."
+  )
+  set(CMAKE_SHARED_LINKER_FLAGS_COVERAGE "${CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO} --coverage" CACHE STRING
+    "Flags used by the shared libraries linker during \"Coverage\" builds."
+  )
+  if(CMAKE_GENERATOR STREQUAL "Ninja Multi-Config")
+    list(APPEND CMAKE_CONFIGURATION_TYPES "Coverage")
+  endif()
+  mark_as_advanced(
+    CMAKE_C_FLAGS_COVERAGE
+    CMAKE_EXE_LINKER_FLAGS_COVERAGE
+    CMAKE_SHARED_LINKER_FLAGS_COVERAGE
+  )
+endif()
 
 get_property(is_multi_config GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
 if(PROJECT_IS_TOP_LEVEL)