GCC or Clang with all warnings turned on will give you almost what you want. -Wconversion -Wdouble-promotion and 100s of others. A good way to learn about warni

GCC or Clang with all warnings turned on will give you almost what you want. -Wconversion -Wdouble-promotion and 100s of others. A good way to learn about warning flags (apart from reading the docs) is Clang -Weverything, which will give you many, many warnings.