Variables can be made accessible from C using the C binding attribute, optionally together with specifying a binding name. Those variables have to be declared in the declaration part of a
MODULE, be of interoperable type, and have neither the
pointer nor the
MODULE m USE myType_module USE ISO_C_BINDING integer(C_INT), bind(C, name="_MyProject_flags") :: global_flag type(myType), bind(C) :: tp END MODULE
_MyProject_flags is the case-sensitive name of the variable as seen from C programs while
global_flag is the case-insensitive name as seen from Fortran. If no binding name is specified, as for tp, the C binding name is the (lowercase) Fortran binding name. If a binding name is specified, only a single variable may be after the double colon. Note of warning: You cannot use a global variable to access errno of the C library as the C standard allows it to be a macro. Use the
IERRNO intrinsic (GNU extension) instead.
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