[m-dev.] sourcing foreign code
novalazy at gmail.com
Wed Feb 26 12:43:00 AEDT 2014
Writing foreign code inside foreign_code is a bit painful (no syntax
highlighting, need to escape quotes and backslashes). When the amount
of foreign code is significant, I would like to keep it in a separate
file and reference it from the Mercury file. This is possible using the
C preprocessor but not ideal:
* mmc --make does not know about the dependency so you must manually
touch the relevant .m file. Imagine if you switch branches in a
workspace and the .c file is touched but not the .m file.
* you must tell the C compiler where to find the .c file,
e.g. with --c-include-dir in Mercury.options
* only works for C backends
A solution might be to extend pragma foreign_decl/foreign_code like so:
:- pragma foreign_code("C", source_file("<path>")).
where <path> is _relative to the .m file_, or else an absolute path.
I have not looked into how much work it would be to modify mmc --make,
but what do you think?
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