On Sat, Mar 03, 2012 at 03:23:01PM +0100, Tobias Burnus wrote: > GNU Fortran warns by default for code like the following: > > interface > subroutine sub (n) bind (C) > integer :: n > end subroutine sub > end interface > > Namely, it prints: > > Warning: Variable 'n' at (1) is a parameter to the BIND(C) procedure > 'sub' but may not be C interoperable > > That's on one hand correct: There is no defined relation between Fortran > default kinds (or any kind number) and the C types. Thus, the proper way > is to use the parameters defined in ISO_C_BINDING, such as "c_int". > > On the other hand, "integer" and "int" is the same on many (but not on > all systems) and, thus, many users simply use the default type. > > Compiling interfaces with hundreds of such definitions clutters the > screen with those warnings and makes it difficult to spot other warnings. > > Thus, this patch adds a warning flag for this purpose - and it also > excludes those warnings from the default setting. That's a bit in line > with Fortran 2008 and TS 29113, which remove more and more constraints > and force the users to ensure themselves that the variables are > interoperable. However, keeping it as default warning is also fine with me. > > Build and regtested on x86-64-linux. > OK? >
OK. -- Steve
