How to compile single Qt module and use it on app?
-
@JKSH said in How to compile single Qt module and use it on app?:
Ok, so you want to do a git-bisect. Someone did that at https://bugreports.qt.io/browse/QTBUG-73715
I've never done this on Qt itself before, so I don't know what's the correct/safe way to do it.Probably... if this project was as easy changing the commit + press 1 button and getting a fresh build I'd try that straightaway. Problem is a cold build right now is ~20min and If I switch to another commit and I reconfigure it (without cleaning) I'll get errors so I need to be careful with the test strategy :/ . Right now I've built v5.11.2 using a prefix of "d:/qt/5.11.2" and I've figured out all candidate commits that have potentially introduced the bug:
08de243eaa (tag: v5.11.3, 5.11.3) Add changes file for Qt 5.11.3 c05080102f tst_QNetworkReply: Blacklist getFromHttp:success-external c69f43594f Merge 5.11 into 5.11.3 9137691e74 Windows QPA: Fix crash showing QSystemTrayIcon's context menu with PROCESS_DPI_UNAWARE dec7961709 QSyntaxHighlighter: Delay all highlights until first rehighlight bdebc90c28 Bump version 38b87cc4bb Doc: Clarify what samples() returns if not explicitly set 9933511838 Fix typo in define. s/GL_FRAMEBUFFER_SRB/GL_FRAMEBUFFER_SRGB 825f988156 Modernize the "textcodec" feature b5d249f953 Update the floppy disk icon (save) to be physically correct 9f2216667a Fix memory copy in QGIFFormat::disposePrevious() 033cc3403a mkspecs: use cross compile tools with LTCG 67c66c4ea4 windows: Give up on SwitchableComposition c9d18d4a9c eglfs_kms: initialize m_deviceListener 1b9af84c1b Don't create an offscreen surface when not on the GUI thread 3b8075de3b Fix deleting of QSharedPointer internals in case QPointer loses the race d4e937a628 xcb: Don't get initial screen rotation d2e0e416d4 Fix leaking QTabletEventPrivate instance 38afa46c47 macOS: Only detect changes to the SDK version within the same developer dir 509d566ec0 Don't block mouse events if the window is a Tooltip type 72bedd49bf [cocoa] Disable offline renderers for dual AMD FirePro GPU 0cb44e2cfb Fix stylesheet example for QLineEdit:read-only code example 2708c6c11d OpenSSL: force the "1.0.0" soname when loading OpenSSL 1.0 948f8ce2ec QWinEventNotifier: fix crash on application shutdown 44eeeb8e81 Upgrade PCRE2 to 10.32 6599c1f758 QPicture: fix crash for malformed picture 7f60940fbe Re-disable statx() on Android 2624676b57 qmake: Remove the extra space before -MT 1cd2955173 Fix enum passed to QFontDatabase::findFont fc4b0769a5 Fix pdf printing in static builds b7887f9b4f Linux: Remove our use of syscall() for statx(2) and renameat2(2) 3eebadc173 Modernize the "mimetype" feature 9c8ca26a48 Modernize the "codecs" feature 4e7b58629a Modernize the "big_codecs" feature c593492d16 Modernize the "animation" feature 0509383cf2 Bump copyright year in executable metadata 0d7c049e44 Update bundled libpng to version 1.6.35 dc5f9d0c31 Only use a translucent background if there is support for alpha 091a386eaf Use native visual ID when creating GBM surfaces for KMS 4dc251879c Ssl: Fix contrived crash when calling resume ba0ff45109 Update the DNS public suffix list from publicsuffix.org 836a2fb887 [macOS] Fix position of sheets when using unifiedTitleAndToolBarOnMac 7146c9075c Fix DejaVu fonts URL 92f42caff1 Fix ICE on QNX 6.6 04aeffbe8f Doc: Describe behavior of QSslConfiguration::caCertificates() on iOS 18ec0a8b09 Windows QPA: Fix WM_NCHITTEST not being sent to QAbstractNativeEventFilter d8817ddde6 Use update() instead of repaint() when displaying a new message ced34cb3d5 QDateTimeParser: avoid using an invalid hour by default 5a295a1009 Scale seconds by a thousand to get milliseconds c958fb8b48 zlib: Fix spelling of license b2b32d3147 fix HTML subset documentation is not very readable on smaller screens caa598c843 Fix QUrl::matches for when removing authority parts (other than host) 94884246d4 QCommandLineParser: Ensure that an option text ends with a newline ef4ba0285f SSL: Don't write to closed socket or write to deallocated buffer 3ed8dc3788 Android: fix log output pattern 857a0d4c51 Fix the /J option for MSVC project generation 555a6b5d5d Modernize the "filesystemwatcher" feature 5e64957ee4 Fix QCompleter popups preventing the application from exiting f99e956d65 Add QT_REQUIRE_CONFIG(ssl) to pre-shared key authenticator 02663718a9 QHeaderView: Don't unhide hidden sections on layoutChanged() b26cd68bf6 Modernize the "datestring" feature e226b0f94a Modernize the "textdate" feature 6948bf20a7 QSslContext: Use 0 instead of TLS_MAX_VERSION 4b7ff8e98c Protect HSTS code for no-feature-settings build 4fc4f7b0ce Export qt_open64 from QtCore 8aa9bb6d3f Clarify docs regarding the states of a QFutureWatcher with no future set 12c357bebb Document IAccessible2 version cb5c24fa26 Fix integer overflow in very long sections in ELF objects 1511bfef52 Disable RGB64 backend for ARGB32 when it will be very slow 6af8b5e791 Merge remote-tracking branch 'origin/5.11.2' into 5.11 49efea26a5 sqlite: Fix QSqlError handling when opening/closing database 45c1473847 Detect when we are at the sentence boundary b0dce506cc (HEAD -> 5.11.2, tag: v5.11.2) add buildsystem+qmake changelogProblem is I'm not sure what's the safest way to test them out without spawning a cold build on each new test :/ . I'm using visual studio compiler and I haven't found any "standard" alternative to ccache, just a bunch of github projects that looked kind of experimental.
In any case, you can see there are 73 commits over there to check and in the worst case scenario would be 73*20min if
cleaning before building, that's nuts and I definitely won't go down that path :) -
@_BPL_ said in How to compile single Qt module and use it on app?:
In any case, you can see there are 73 commits over there
No, not 73 - max. 7 - see git bisect
-
@Christian-Ehrlicher said in How to compile single Qt module and use it on app?:
No, not 73 - max. 7 - see git bisect
Mmmm, interesting command indeed, it uses binary search... guess that 7 comes from ceil(log2(73))? Worst case of 7*20 isn't that bad (I guess :P)... I'll get familiar with that command first using some dummy projects for not screwing up with the real thing.
In any case, it'd be interesting to know what's the workflow used by qt developers, which I'm pretty much sure it'll be quite optimized so they can check different versions relatively fast.
-
@_BPL_ said in How to compile single Qt module and use it on app?:
Mmmm, interesting command indeed, it uses binary search... guess that 7 comes from ceil(log2(73))? Worst case of 7*20 isn't that bad (I guess :P)... I'll get familiar with that command first using some dummy projects for not screwing up with the real thing.
In any case, it'd be interesting to know what's the workflow used by qt developers, which I'm pretty much sure it'll be quite optimized so they can check different versions relatively fast.
See my previous post. It contains a link to an example where someone used
git-bisectto hunt down a Qt bug. It also contains a link to the Developer mailing list where you can talk to the Qt developers directly. -
@JKSH said in How to compile single Qt module and use it on app?:
See my previous post. It contains a link to an example where someone used git-bisect to hunt down a Qt bug. It also contains a link to the Developer mailing list where you can talk to the Qt developers directly.
Thanks, but... I've decided to ask to one of the devs... It'd be great if git-bisect could be used effectively on windows+visual_studio although my hopes are quite low.
The closes I've been to avoid doing
git checkout -- . && git clean -fxdwas to checkout a possible bad commit,cd qmake && nmake cleanandconfigure.bat <options>... in this case configure.bat wouldn't give me errors... but when building again qtbase times would still be as similar as a cold build :( -
Why not simply using git-bisect on the command line and compile without any make clean before? I don't see any need to call configure.bat again - nothing configure specific will change inbetween those 72 commits in a stable branch - and if you will notice it during compilation.
-
@Christian-Ehrlicher said in How to compile single Qt module and use it on app?:
Why not simply using git-bisect on the command line and compile without any make clean before? I don't see any need to call configure.bat again - nothing configure specific will change inbetween those 72 commits in a stable branch - and if you will notice it during compilation.
Maybe you're right and probably that's the faster startegy for bug hunting using git-bisect on qtbase. Only advantage of cleaning & reconfiguring is you can keep the good/bad commits living in separate folders (each time I was calling configure.bat I was using as a prefix the result of
git describe --tags commit_hash) but consider the only goal is bug hunting probably these good/bad commit folders shouldn't be kept anyway (are they useful for other purposes?)Anyway, I've found the commit that introduced the bug and it's 1 year old, that's crazy :P !!!! It'd be really interesting to know how long would it take to hunt it using your method when working on latest master (configured&built ready).
I've learned quite a lot thanks to this bug but it's still unclear to me when it's required to reconfigure again before building... it'd be interesting to learn that for future bug huntings :)
-
@Christian-Ehrlicher said in How to compile single Qt module and use it on app?:
Why not simply using git-bisect on the command line and compile without any make clean before? I don't see any need to call configure.bat again - nothing configure specific will change inbetween those 72 commits in a stable branch - and if you will notice it during compilation.
Btw... I've tested this suggestion and I can tell it won't work, give it a shot and you'll see, you'll probably end up with compiler/linking errors mostly of the time (even reconfiguring), so... yeah, unfortunately the only reliable way I've found to build a new local branch is by doing:
git checkout -- . && git clean -fxd:)- configure <options>
- make
Not cool at all :/
-
You can be sure that I compile qtbase more than once a day and calling configure is only needed when switching branches.
-
@Christian-Ehrlicher Sure thing, just to be clear I don't doubt your suggestion works fin... my comment was based on the fact each time I've tried it out here I ended up having errors. Anyway, I'd really like to confirm it so I'll really know when I can apply it. Let's say I've checked out origin/5.12 [5d7e221bbf] and it's built succesfully. Now let's say I'd like to start bisecting without having to reconfigure, what'd be the oldest commit where I can be sure I don't need to reconfigure again? Could you please post the git hash of such a commit? I'd like to check it out.
Thanks in advance!
-
One small suggestion, use out of source builds. This will avoid the problem of cleaning stuff up in the source tree. If your build is broken for some reason, just nuke the folder and start fresh.
-
Here is a generic *nix version but it's easy to translate to Windows style.
mkdir /some_path/builddir/qt5/qtbase cd /some_path/builddir/qt5/qtbase /path/to/Qt_sources/qtbase/configure/some_path/builddiris a path you use for building stuff.I usually keep the
qt5/module_namesstructure so if I build an other module it follows the sources folders structure. It's by no mean mandatory just a habit of mine. -
@SGaist Awesome, this it's exactly how a build should be done... it's clear as water what configure is doing (not a black box anymore) and it's keeping the source tree clean. Right now I'm checking if a build/install using this method will work with origin/HEAD but all it's pointing out that's the case...
Anyway, I still would like to confirm what I've asked couple of comments ago about the git-bisect... Let me put a hypthetical example, let's say you're working on origin/head and you discover there is a bug... what'd be the optimal way to hunt it by using git-bisect? Said otherwise, how do you know what's the oldest commit you'll be able to test without having to reconfigure again?
Btw, this is my first time posting in the forums and while I feel this thread has become really interesting with lots of nice hints I also can see it's deviated a little bit from my original question :) , is that alright or usually this is the type of forum to get "solved" as an end goal (similar to Stackoverflow)... Btw, If that's the case I don't know what's the valid answer anymore lol ;)
Thanks everybody!
-
@_BPL_
Hi
The main goal here is to help people use the Qt framework and when the poster has a positive attitude and
well-asked questions - we are known to help with anything programming related.
We prefer to have unrelated questions in own threads so Title is accurate but in this case,
it was all related to building a module so seems pretty fine.
However, we like if you would use the Topic Tool button in your top post to mark as solved
as that helps other find answers and
us forum lurkers to see what posts are still unanswered.
-
@mrjj Thanks to clarify, that helps and makes total sense... I'll forget about my last question of git-bisect. I think at this point this thread has become quite clear already, I've opened a new one in the corresponding section. This has been my first thread in the forums so I didn't know there was a section called "Installation and Deployment". I guess this one should also be living there.
Anyway, again, thanks everybody for your help!
Ps. When I try to submit is telling me
As a new user, you can only post once every 600 second(s) until you have earned 1 reputation - please wait before posting again, how do earn reputation? Is it a similar system than SO so I need to start answering questions as well?
