Using -Wall in general

MSVC supports it, too.

Author: netromdk

cmake/compilation.cmake

@@ -1,8 +1,10 @@
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall")
+
 if (NOT MSVC)
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -pedantic-errors")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wextra -pedantic-errors")
 
   # Certain warnings are promoted to errors.
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror=unused-variable -Werror=unused-value -Werror=return-type -Werror=shadow")