Cray Fortran uses mangling of the form `my_sub$my_module_` with the
subroutine name first. Teach FortranCInterface to detect this case.
Add `FortranCInterface_MODULE_{,_}ORDER` result variables to report it.
With optimizations on, Cray Fortran inlines the module subroutine into
the calling object, so our symbol with the `INFO` string is not used.
Add a directive to suppress inlining to avoid this.
This is a new FortranCInterface.cmake module to replace the previous
prototype. All module support files lie in a FortranCInterface
directory next to it.
This module uses a new approach to detect Fortran symbol mangling. We
build a single test project which defines symbols in a Fortran library
(one per object-file) and calls them from a Fortran executable. The
executable links to a C library which defines symbols encoding all known
manglings (one per object-file). The C library falls back to the
Fortran library for symbols it cannot provide. Therefore the executable
will always link, but prefers the C-implemented symbols when they match.
These symbols store string literals of the form INFO:symbol[<name>] so
we can parse them out of the executable.
This module also provides a simpler interface. It always detects the
mangling as soon as it is included. A single macro is provided to
generate mangling macros and optionally pre-mangled symbols.
