roll parts of pr385 into source tree
This does not take the PR as is.
Unlike the PR, this streamlines and minimizes the integration somewhat:
- use hints/include mechanism instead of creating alternative
Makefile.dat, Makefile.src, Makefile.top, Makefile.utl in sys/lib;
those would have been a maintenance nightmare.
- don't have alternative mkmkfile.sh and setup.sh in sys/lib.
- sys/lib/libnethackmain.c differed from sys/unix/unixmain.c by
very little, so just place a small bit of conditional code at the
top of sys/unix/unixmain.c instead.
- changed the conditional code bits from __EMSCRIPTEN__ to
CROSS_TO_WASM.
- You should be able to build the wasm result by:
cd sys/unix ; sh setup.sh hints/linux.2020 ; cd ../..
make fetch-lua (<-one time)
make WANT_LIBNH all
- You should be able to build LIBNBH by:
cd sys/unix ; sh setup.sh hints/linux.2020 ; cd ../..
make fetch-lua (<-one time)
make CROSS_TO_WASM=1 all
As it is currently coded, winshim.c requires C99.
Allow sharing of common code between different hints files
through use of: #-INCLUDE
new folder created: sys/unix/hints/include
new hints include files:
sys/unix/hints/include/multiw-1.2020
sys/unix/hints/include/multiw-2.2020
structure the early parts of sys/unix/hints/linux.2020 and
sys/unix/hints/macOS.2020 consistently, and utilize #-INCLUDE multiw-1.2020
and #-INCLUDE multiw-2.2020 in them. That will allow the Makefile lines
that they contain to be maintained in a single place.
