Re: Importing C structs?

[Samuel Tardieu <sam@rfc1149.net>]

>>>>> "Simon" == Simon Wright <simon@pushface.org> writes:

Simon> I'm pretty sure GNAT will do the Right Thing here (ie pass the
Simon> address of the record parameter). I suppose there might be
Simon> problems with very small arrays on architectures where these
Simon> are passed in registers? but since the Ada and C compilers have
Simon> the same backend you are quite likely to be lucky. pragma
Simon> Convention (C, ) means "do what the C compiler expects", after
Simon> all.

Not exactly, but quite. The RM suggests that any record be passed by
reference, while on most platforms small records (not greater than a
word) are expected on the stack or in a register.

GNAT follows the RM suggestion but allows you to override this choice
by applying pragma Pass_By_Copy (GNAT specific) to your record type.

  Sam
-- 
Samuel Tardieu -- sam@rfc1149.net -- http://www.rfc1149.net/sam