linux - GCC how to force redefinition warning to error -


in gcc can pass option 

-werror=

to force particular warning error. not able find option need pass warning 

redefined [enabled default]

to error. option should pass if user defined macro redefined force error.

since 

g++ -fdiagnostics-show-option -wunused-macros ./test.cpp

doesn't come flag that directly controls emission of warning (diagnostic) can conclude there is, in fact, no such option.

you might inquire @ gcc-devel list or file request enhancement.

alternatively, @ preprocessor has more options , use explicitely.


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