-Wall -Wextra
are the bare minumun of warnings to enable
-Wmissing-declarations -Wformat=2
are a good step in the right direction, but
gcc is known to have bad default warning options.
Here is an incomprehansive list of warnings to consider enabeling:
-Wshadow # warn the user if a variable declaration shadows one from a parent context
-Wnon-virtual-dtor # warn the user if a class with virtual functions has a non-virtual destructor.
# This helps catch hard to track down memory errors
-Wold-style-cast # warn for c-style casts
-Wcast-align # warn for potential performance problem casts
-Wunused # warn on anything being unused
-Woverloaded-virtual # warn if you overload (not override) a virtual function
-Wpedantic # warn if non-standard C++ is used
-Wconversion # warn on type conversions that may lose data
-Wsign-conversion # warn on sign conversions
-Wnull-dereference # warn if a null dereference is detected
-Wdouble-promotion # warn if float is implicit promoted to double
-Wformat=2 # warn on security issues around functions that format output (ie printf)
-Wmisleading-indentation # warn if indentation implies blocks where blocks do not exist
-Wduplicated-cond # warn if if / else chain has duplicated conditions
-Wduplicated-branches # warn if if / else branches have duplicated code
-Wlogical-op # warn about logical operations being used where bitwise were probably wanted
-Wuseless-cast # warn if you perform a cast to the same type
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