build: Refactor out Qt version check macro #17837

1. 
   hebasto commented at 0:53 am on December 31, 2019: member

   This PR removes code that repeats three times. Also currently on master (8830cb58abc888144a1edb9b2fba427716cc45d8) some parts are brittle:

   https://github.com/bitcoin/bitcoin/blob/8830cb58abc888144a1edb9b2fba427716cc45d8/build-aux/m4/bitcoin_qt.m4#L290

   https://github.com/bitcoin/bitcoin/blob/8830cb58abc888144a1edb9b2fba427716cc45d8/build-aux/m4/bitcoin_qt.m4#L387

   ---

   Also there is a little change that fixes a warning:

   0$ cat config.log | grep -A 2 'extra tokens'
   1conftest.cpp:76:28: warning: extra tokens at end of #ifndef directive
   2         #ifndef QT_VERSION OR QT_VERSION_STR
   3                            ^~
   

2. build: Refactor out Qt version check macro 83db522594
3. build: Remove extra tokens warning d6d017b125
4. fanquake added the label Build system on Dec 31, 2019
5. 
   hebasto commented at 1:10 am on December 31, 2019: member

   Closed in favor of #17820.
6. hebasto closed this on Dec 31, 2019

   ---

7. DrahtBot locked this on Dec 16, 2021

Contributors
hebasto

Labels
Build system