message: why was I even trying to not set unrecognized options.... so much pain with 0 gain
diff: @@ -79,9 +79,9 @@ if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
  endif()
  if(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
  + add_compiler_flags(-Wno-unknown-pragmas)
  add_compiler_flags(-Wall)
  add_compiler_flags(-Wextra)
  - #add_compiler_flags(-Wno-unknown-pragmas)
  add_compiler_flags(-fdiagnostics-show-option)
  add_compiler_flags(-Wconversion)
  add_compiler_flags(-Wold-style-cast)
  @@ -113,7 +113,19 @@ if(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
  add_compiler_flags(-Wunused-but-set-variable)
  add_compiler_flags(-Wunused-result)
  add_compiler_flags(-Wsuggest-override)
  -
  + add_compiler_flags(-Wdouble-promotion)
  + add_compiler_flags(-Wtrampolines)
  + add_compiler_flags(-Wzero-as-null-pointer-constant)
  + add_compiler_flags(-Wuseless-cast)
  + add_compiler_flags(-Wnoexcept)
  + add_compiler_flags(-Wvector-operation-performance)
  + add_compiler_flags(-Wshift-overflow=2)
  + add_compiler_flags(-Wnull-dereference)
  + add_compiler_flags(-Wduplicated-cond)
  + add_compiler_flags(-Walloc-zero)
  + add_compiler_flags(-Walloca)
  + add_compiler_flags(-Wduplicated-branches)
  + add_compiler_flags(-Wcast-align=strict)
  add_compiler_flags(-Wsuggest-attribute=cold)
  add_compiler_flags(-Wsuggest-attribute=const)
  add_compiler_flags(-Wsuggest-attribute=format)
  @@ -123,39 +135,11 @@ if(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
  add_compiler_flags(-Wsuggest-final-methods)
  add_compiler_flags(-Wsuggest-final-types)
  - if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.6)
  - add_compiler_flags(-Wnoexcept)
  - endif()
  -
  # no way to silence it in the expression decomposition macros: _Pragma() in macros doesn't work for the c++ front-end of g++
  # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55578
  # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69543
  # Also the warning is completely worthless nowadays - http://stackoverflow.com/questions/14016993
  #add_compiler_flags(-Waggregate-return)
  -
  - if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.0)
  - add_compiler_flags(-Wdouble-promotion)
  - add_compiler_flags(-Wtrampolines)
  - add_compiler_flags(-Wzero-as-null-pointer-constant)
  - add_compiler_flags(-Wuseless-cast)
  - add_compiler_flags(-Wvector-operation-performance)
  - endif()
  -
  - if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 6.0)
  - add_compiler_flags(-Wshift-overflow=2)
  - add_compiler_flags(-Wnull-dereference)
  - add_compiler_flags(-Wduplicated-cond)
  - endif()
  -
  - if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 7.0)
  - add_compiler_flags(-Walloc-zero)
  - add_compiler_flags(-Walloca)
  - add_compiler_flags(-Wduplicated-branches)
  - endif()
  -
  - if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 8.0)
  - add_compiler_flags(-Wcast-align=strict)
  - endif()
  endif()
  if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
  