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"tag not used" warning when using (p)dep to declare linking tags #6893

vicuna opened this issue Jun 5, 2015 · 2 comments


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commented Jun 5, 2015

Original bug ID: 6893
Reporter: @gasche
Assigned to: @gasche
Status: closed (set by @damiendoligez on 2015-06-05T19:37:53Z)
Resolution: fixed
Priority: normal
Severity: minor
Version: 4.02.1
Target version: 4.02.2+dev / +rc1
Fixed in version: 4.02.2+dev / +rc1
Category: -for ocamlbuild use

Bug description

On the caml-list, Christiano Haesbaert reports:

Just one more question, now with the real code, I was able to move
everything to myocamlbuild, but I'm getting a warning:
File "_tags", line 10, characters 12-28:
Warning: the tag "linkdep(stubs.o)" is not used in any flag
declaration, so it will have no effect; it may be a typo. Otherwise
use mark_tag_used in your to disable this warning.

ocamlbuild -use-ocamlfind all.otarget $@

_tags line

<*.native>: linkdep(stubs.o)

open Ocamlbuild_plugin;;
dispatch begin function
| After_rules ->
pflag ["ocaml";"compile";] "ppopt" (fun s -> S [A"-ppopt"; A s]);
pflag ["ocaml";"ocamldep";] "ppopt" (fun s -> S [A"-ppopt"; A s]);
pdep ["link"] "linkdep" (fun param -> [param])
| _ -> ()

It seems to be the same case as

Should I just use mark_tag_used ? It seems something else is wrong
since the tag is actually used.

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commented Jun 5, 2015

Comment author: @gasche

The uploaded patch fixes the issue. I'm not sure whether it is too late for inclusion in 4.02, waiting on Damien's opinion.


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commented Jun 5, 2015

Comment author: @damiendoligez

Patch applied to branch 4.02 (rev 16162).

@vicuna vicuna closed this Jun 5, 2015

@vicuna vicuna added the ocamlbuild label Mar 14, 2019

@vicuna vicuna added this to the 4.02.2 milestone Mar 14, 2019

@vicuna vicuna added the bug label Mar 20, 2019

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