building .cmxa does not build/link c_names files #131
Description
Consider the following setup:
echo "This C file does not compile" > exists.c
echo "let x = 42" > a.ml
cat << EOF > jbuild
(jbuild_version 1)
(library
((name mylib)
(modules (a))
(c_names (exists doesnotexist))
))
EOF
Note that one of the C files exists but contains code that does not compile, and the other does not exist.
Then:
jbuilder build mylib.cmxa --verbose
-> builds mylib.cmxa without building exists.c and doesnotexist.c. This links against a libmylib_stubs.a which is not built and does not exist anywhere AFAICS:
Running[2]: (cd _build/default && /home/rlehy/.opam/4.04.0/bin/ocamldep.opt -modules a.ml -impl mylib.ml-gen) > _build/default/mylib.depends.ocamldep-output
Running[3]: (cd _build/default && /home/rlehy/.opam/4.04.0/bin/ocamlc.opt -w -40 -w -49 -g -bin-annot -no-alias-deps -I . -o mylib.cmo -c -impl mylib.ml-gen)
Running[4]: (cd _build/default && /home/rlehy/.opam/4.04.0/bin/ocamlopt.opt -w -40 -w -49 -g -intf-suffix .ml-gen -no-alias-deps -I . -o mylib.cmx -c -impl mylib.ml-gen)
Running[5]: (cd _build/default && /home/rlehy/.opam/4.04.0/bin/ocamlc.opt -w -40 -g -bin-annot -no-alias-deps -I . -open Mylib -o mylib__A.cmo -c -impl a.ml)
Running[6]: (cd _build/default && /home/rlehy/.opam/4.04.0/bin/ocamlopt.opt -w -40 -g -intf-suffix .ml -no-alias-deps -I . -open Mylib -o mylib__A.cmx -c -impl a.ml)
Running[7]: (cd _build/default && /home/rlehy/.opam/4.04.0/bin/ocamlopt.opt -w -40 -g -a -o mylib.cmxa -cclib -lmylib_stubs mylib.cmx mylib__A.cmx)
However, if I ask for the .cmxs, the .cmxa is correctly built with the C files inside (I fixed up exists.c and touched doesnotexist.c):
jbuilder build mylib.cmxs --verbose
Running[2]: (cd _build/default && /home/rlehy/.opam/4.04.0/bin/ocamlc.opt -g -ccopt -g -o doesnotexist.o doesnotexist.c)
Running[3]: (cd _build/default && /home/rlehy/.opam/4.04.0/bin/ocamlc.opt -g -ccopt -g -o exists.o exists.c)
Running[4]: (cd _build/default && /home/rlehy/.opam/4.04.0/bin/ocamldep.opt -modules a.ml -impl mylib.ml-gen) > _build/default/mylib.depends.ocamldep-output
Running[5]: (cd _build/default && /home/rlehy/.opam/4.04.0/bin/ocamlc.opt -w -40 -w -49 -g -bin-annot -no-alias-deps -I . -o mylib.cmo -c -impl mylib.ml-gen)
Running[6]: (cd _build/default && /home/rlehy/.opam/4.04.0/bin/ocamlopt.opt -w -40 -w -49 -g -intf-suffix .ml-gen -no-alias-deps -I . -o mylib.cmx -c -impl mylib.ml-gen)
Running[7]: (cd _build/default && /home/rlehy/.opam/4.04.0/bin/ocamlc.opt -w -40 -g -bin-annot -no-alias-deps -I . -open Mylib -o mylib__A.cmo -c -impl a.ml)
Running[8]: (cd _build/default && /home/rlehy/.opam/4.04.0/bin/ocamlopt.opt -w -40 -g -intf-suffix .ml -no-alias-deps -I . -open Mylib -o mylib__A.cmx -c -impl a.ml)
Running[9]: (cd _build/default && /home/rlehy/.opam/4.04.0/bin/ocamlopt.opt -w -40 -g -a -o mylib.cmxa -cclib -lmylib_stubs mylib.cmx mylib__A.cmx)
Running[10]: (cd _build/default && /home/rlehy/.opam/4.04.0/bin/ocamlmklib.opt -g -o mylib_stubs exists.o doesnotexist.o)
Running[11]: (cd _build/default && /home/rlehy/.opam/4.04.0/bin/ocamlopt.opt -w -40 -g -shared -linkall -I . -o mylib.cmxs mylib.cmxa)