D15997: Make KPimGAPI optional

[Pino Toscano]

pino created this revision.
pino added a reviewer: dvratil.
Herald added a project: KDE PIM.
Herald added a subscriber: kde-pim.
pino requested review of this revision.

REVISION SUMMARY
  The smtp plugin requires KPimGAPI for the XOauth2 authentication method;
  OTOH, KPimGAPI requires QtWebEngine, which is not really portable (and
  only available on few Linux archs).
  
  Hence, since kmailtransport is a library used also in other components,
  make sure it can be built without KPimGAPI:
  
  - make KPimGAPI an optional dependency
  - disable the XOauth2 authentication method without KPimGAPI, erroring out in case it is attempted

TEST PLAN
  - build kmailtransport without KPimGAPI: works, no dependency
  - build kmailtransport with KPimGAPI: works, uses KPimGAPI

REPOSITORY
  R84 PIM: KMail Transport

BRANCH
  optional-kpimgapi (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D15997

AFFECTED FILES
  CMakeLists.txt
  config-kmailtransport.h.cmake
  src/kmailtransport/plugins/smtp/CMakeLists.txt
  src/kmailtransport/plugins/smtp/autotests/CMakeLists.txt
  src/kmailtransport/plugins/smtp/smtpconfigwidget.cpp
  src/kmailtransport/plugins/smtp/smtpjob.cpp

To: pino, dvratil
Cc: kde-pim, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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