mesonbuild/meson

ninja build or ninja reconfigure does not detect dependency changes

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#2,475 opened on Oct 11, 2017

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Description

Hi,

I've got:

gmime3   = dependency ('gmime-3.0', required : false)
gmime2   = dependency ('gmime-2.6', required : false)

if gmime3.found ()
  gmime = gmime3
  gmime_gir = 'GMime-3.0'
elif gmime2.found ()
  gmime = gmime2
  gmime_gir = 'GMime-2.6'
else
  error ('neither gmime3 or gmime2 available')
  gmime_gir = ''
endif

deps = [ gmime ]

if gmime2 or gmime3 is installed/un-installed ninja reconfigure does not reliably detect the change. E.g. uninstalling gmime3, and installing gmime2 still tries to use gmime3 build commands. Have to delete dir and re-configure. Seems to sometimes work the other way.. which keeps breaking my separate build dir.

Contributor guide

Tech stack
python
Domain
build system
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
over 1 week
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
needs investigation
Prerequisites
Understanding of Meson build systemFamiliarity with Ninja build tool
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20
Research direction
Investigate how Meson currently tracks dependencies and triggers reconfiguration. Look at the code in 'mesonbuild/dependencies/' and how external dependency changes are detected. The issue indicates that ninja reconfigure does not reliably detect installation/uninstallation of gmime libraries; perhaps the dependency hash or timestamps are not being checked. Review linked discussions or similar issues for clues.