At least Debian/Ubuntu use 'qtchooser' for switching between qt4/qt5 binaries. It is a wrapper for all qt tools, and calls the named tool of the default version unless overridden by the -qt= option or QT_SELECT environment variable. QT_SELECT is set by configure once the qt version has been chosen. Take for example, moc. $ which moc /usr/bin/moc $ ls -go /usr/bin/moc lrwxrwxrwx 1 9 Jul 3 21:33 /usr/bin/moc -> qtchooser $ qtchooser -print-env QT_SELECT="default" QTTOOLDIR="/usr/lib/x86_64-linux-gnu/qt4/bin" QTLIBDIR="/usr/lib/x86_64-linux-gnu" $ QT_SELECT=qt5 qtchooser -print-env QT_SELECT="qt5" QTTOOLDIR="/usr/lib/x86_64-linux-gnu/qt5/bin" QTLIBDIR="/usr/lib/x86_64-linux-gnu" $ moc -v Qt Meta Object Compiler version 63 (Qt 4.8.4) $ QT_SELECT=qt5 moc -v Qt Meta Object Compiler version 67 (Qt 5.0.1) This should be harmless elsewhere.
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Bitcoin Core integration/staging tree
Copyright (c) 2009-2013 Bitcoin Core Developers
What is Bitcoin?
Bitcoin is an experimental new digital currency that enables instant payments to anyone, anywhere in the world. Bitcoin uses peer-to-peer technology to operate with no central authority: managing transactions and issuing money are carried out collectively by the network. Bitcoin Core is the name of open source software which enables the use of this currency.
For more information, as well as an immediately useable, binary version of the Bitcoin Core software, see http://www.bitcoin.org/en/download.
Developers work in their own trees, then submit pull requests when they think their feature or bug fix is ready.
If it is a simple/trivial/non-controversial change, then one of the Bitcoin development team members simply pulls it.
If it is a more complicated or potentially controversial change, then the patch submitter will be asked to start a discussion (if they haven't already) on the mailing list.
The patch will be accepted if there is broad consensus that it is a good thing. Developers should expect to rework and resubmit patches if the code doesn't match the project's coding conventions (see doc/coding.md) or are controversial.
master branch is regularly built and tested, but is not guaranteed to be
completely stable. Tags are created
regularly to indicate new official, stable release versions of Bitcoin.
Testing and code review is the bottleneck for development; we get more pull requests than we can review and test. Please be patient and help out, and remember this is a security-critical project where any mistake might cost people lots of money.
Developers are strongly encouraged to write unit tests for new code, and to
submit new unit tests for old code. Unit tests can be compiled and run (assuming they weren't disabled in configure) with:
Every pull request is built for both Windows and Linux on a dedicated server, and unit and sanity tests are automatically run. The binaries produced may be used for manual QA testing — a link to them will appear in a comment on the pull request posted by BitcoinPullTester. See https://github.com/TheBlueMatt/test-scripts for the build/test scripts.
Manual Quality Assurance (QA) Testing
Large changes should have a test plan, and should be tested by somebody other than the developer who wrote the code. See https://github.com/bitcoin/QA/ for how to create a test plan.