What happens for C/C++ builds if CMAKE_BUILD_TYPE is empty?

Question

When the variable CMAKE_BUILD_TYPE is empty which compiler flags are used? Does the compiler then simply use CMAKE_CXX_FLAGS and CMAKE_C_FLAG

Answer 1

As a comment on https://blog.kitware.com/cmake-and-the-default-build-type/ says, the default (empty) build type is targeted at Linux distributions which want to use the same compiler flags for multiple packages.