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strange behavior with "Warning: the tag "precious" is not used in any flag declaration" #6640

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vicuna opened this issue Oct 31, 2014 · 3 comments

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commented Oct 31, 2014

Original bug ID: 6640
Reporter: william
Assigned to: @gasche
Status: closed (set by @xavierleroy on 2016-12-07T10:36:58Z)
Resolution: fixed
Priority: normal
Severity: minor
Version: 4.02.1
Category: -for ocamlbuild use https://github.com/ocaml/ocamlbuild/issues
Monitored by: @hcarty

Bug description

I get this message :

Warning: the tag "precious" 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 myocamlbuild.ml to disable this warning.

which is due to this in my _tags file :
<old/GlHack/*>:precious

This line works and tells ocamlbuild not to "sanitize" .c files in GlHack. So the warning should not appear ?

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commented Oct 31, 2014

Comment author: william

further more, I do not use myocamlbuild.ml

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commented Nov 3, 2014

Comment author: william

the warning disappear if I replace 'precious' by 'not_hygienic'

Maybe it would be worth to tell somewhere in the doc that precious is deprecated, and that we should use 'not_hygienic' instead ?

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commented Nov 23, 2014

Comment author: @gasche

It's not a decision to deprecate "precious", just that it was forgotten when listing the "hard-coded tags" to be avoided by the "unused tag" warning. This is now fixed in the 4.02 and trunk branches.

(Moving from "precious" to "not_hygienic" is indeed a correct workaround, as they have the same semantics.)

@vicuna vicuna closed this Dec 7, 2016

@vicuna vicuna added the ocamlbuild label Mar 14, 2019

@vicuna vicuna added the bug label Mar 20, 2019

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