why no error for multiple definition of a variable

[mehmet.karakaya]

hello dear forum

accidentally i define same global variable in two different c file

why I havent got any error

thank you

[TDK]

C files are their own compilation unit. Other C files cannot see variables in them unless they are defined in a header (as extern, in this case).

Edit: above only applies if they're declared static.

[Nikita91]

An the linkers have different behaviour:

some allocates a variable for each source file, others only allocates one...