build: don't set global compiler flags

Author: tearfur

cmake/functions/project_flags.cmake

@@ -53,41 +53,3 @@ macro(set_compiler_booleans)
         set(EXPECTED_COMPILER ON)
     endif()
 endmacro()
-
-# @brief Set the default optimization flags in case the user didn't
-#        explicitly choose it with -DCMAKE_CXX_FLAGS
-macro(set_optimization_flags)
-    set(OPTIMIZATION_FLAG_IS_SET OFF)
-    if (CMAKE_CXX_FLAGS)
-        set(OPT_FLAGS /O1 /O2 /Ob /Od /Og /Oi /Os /Ot /Ox /Oy /favor -O0 -O1 -O -O2 -O3 -Os -Ofast -Og)
-        string(REPLACE " " ";" CMAKE_CXX_FLAGS_LIST ${CMAKE_CXX_FLAGS})
-        foreach(FLAG ${CMAKE_CXX_FLAGS_LIST})
-            if (${FLAG} IN_LIST OPT_FLAGS)
-                message("CXX optimization flag is already set to ${FLAG}")
-                set(OPTIMIZATION_FLAG_IS_SET ON)
-            endif()
-        endforeach()
-    endif()
-
-    if (NOT OPTIMIZATION_FLAG_IS_SET)
-        if (CMAKE_BUILD_TYPE STREQUAL "Debug")
-            if (EMSCRIPTEN)
-                set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O0 -g4")
-            elseif (MSVC)
-                set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /O0")
-            elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang" OR CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
-                set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O0")
-            else()
-                # https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html
-                set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O0")
-            endif()
-        else()
-            if (MSVC)
-                set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /O2")
-            else()
-                set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O2")
-            endif()
-        endif()
-        message("Setting CXX flags to default for ${CMAKE_BUILD_TYPE} mode (${CMAKE_CXX_FLAGS})")
-    endif()
-endmacro()

cmake/small/variables.cmake

@@ -11,7 +11,6 @@
 include(cmake/functions/all.cmake)
 set_master_project_booleans()
 set_debug_booleans()
-set_optimization_flags()
 set_compiler_booleans()
 
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