Dune - object file output is not using -output-complete-obj

Learning
1

I’m on 1.0+beta19.1 and my jbuild file contains the following:

(jbuild_version 1)

(executable (
 (name react_ios)
 (libraries (r2n2))
 (modes (object))
))

(install (
  (package react_ios)
  (section lib)
  (files (react_ios.o))
))

I expected the resulting object file to be fully linked. However, it seems like dune passes -c to ocamlopt in the following command (taken from jbuilder build --verbose):

ocamlopt -w -40 -g -I src/bin/.react_ios.eobjs -I src/flex/.flex.objs -I src/lib/.r2n2.objs -intf-suffix .ml -no-alias-deps -o src/bin/.react_ios.eobjs/react_ios.cmx -c -impl src/bin/react_ios.re.ml

It results in a react_ios.o file however it’s not fully linked.

2

@jeremiedimino should have a look at this if he has the time. But looking at the tests for output-obj I see taht you’re not quite doing the write thing.

The object file you’re looking for is react_ios.exe${ext_obj}.

3

Thank you. You’re right. However changing it causes:

No rule found for src/bin/react_ios.exe${ext_obj} (context default.ios)
4

Probably because the modes were setup differently. The relevant mode those tests is native object.

Btw, what problem do you have with -c being passed? AFAIK that has nothing to do with the kind of object file you’re trying to produce.

5

Unfortunately, I’ve set the modes in the same way, i.e. (modes ((native object))).

I don’t have a problem with -c being passed per se, I wanted to give as much information as possible.

6

The various extensions are documented in the manual: http://dune.readthedocs.io/en/latest/jbuild.html#linking-modes.

-c is passed for compiling but not for linking.

For the second problem, it is because we don’t currently expand variables in install stanza, we need to change that.

1 Like
7

Thank you. Expanding the extension manually worked.

8

I will create an issue regarding variable expansion in install stanzas.