Build error, Qt 5.10, Windows
Have been using Qt for quite a while to build a number of (primarily desktop) apps. In particular, have successfully used my existing Qt installation to build a handful of diverse apps.
Now suddenly I can no longer build anything. I am using Qt Creator 4.5.0 and Qt 5.10.0.
The specific error is:
13:13:40: Could not start process "qmake.exe" someproject.pro -spec win32-g++ "CONFIG+=debug" "CONFIG+=qml_debug"
Error while building/deploying project someproject (kit: Desktop Qt 5.10.0 MinGW 32bit)
When executing step "qmake"
I suspect some configuration setting has gotten messed up but don't know where to start.
Outside the Qt Creator environment, and without need to tweek any environment variables, I can issue the relevant qmake command to create the appropriate Makefile, etc.
I can then simply issue "mingw32-make.exe" to successfully build the app.
BTW, after having run the qmake command outside of Qt Creator, Qt gives a comparable error "13:41:20: Could not start process mingw32-make.exe".
Any suggestions where to look for why Qt Creator fails in issuing the qmake command?
Take a look at the "Build and Run" panel of Qt Creator's preferences. You can find there your Kits, Qt Versions, Compilers etc.
All of the build/run options seem correctly set.
BTW, I have experienced many prior errors with these settings. ALL prior errors have been of the ilk [compiler, make, qmake, etc] not found or specific errors reported from those tools. I have never seen a "could not start process" error.
If you refer to specific preferences that cause errors like the one I report, it would be more helpful to point specific to those sorts of preferences.
@drmhkelley If you go to "Build & Run/Qt Versions" do you see any warnings/errors there? Is the path to qmake.exe set properly there?
There are no errors there.
As mentioned in my original post, I can cut/paste the qmake command into a command window (with current directory properly set) and and run qmake. I can then cut/paste the configured make command to correctly make the app.
Did you modify the PATH environment variable within Qt Creator ?
Not sure what you mean. PATH seems to be correct in my Windows environment (i.e., everything works outside Qt Creator), but I don't recall seeing anywhere in Qt Creator's options where to set a different value for PATH.
Further, the error message appears to give verbatim the command for which a process cannot start - that command includes the full path for the failing command. It looks more like whatever mechanism, internal to Qt Creator for starting additional processes, is itself the problem.
In the Project panel, you have there the environment setup for build time and run time.
A wild idea, did you try to nuke the .pro.user file and reconfigure your project anew ?
I resolved this problem. Well, I resolved this particular instance of a larger and completely weird problem.
Turns out, Qt/Tools/QtCreator/bin was missing two files (don't ask how I eventually figured this out). qtcreator_ctrlc_stub.exe and Clangbackendipc4.dll were just not there - not a clue how/when they disappeared. Once I restored them, QtCreator seems to work correctly.
Full disclosure, I have experienced behavior like this before - enough that I now officially believe in gremlins. Occasional, important files (like g++.exe, make.exe, ar.exe, and others) just vanish. In the middle of a multi-step make process, g++.exe will just vanish., causing make to fail with a "cannot fine g++" error, after having already compiled a couple dozen files.
So the problem you tried to help me with will likely recur at some point, but at least I now have a better chance of tracking down this really bizarre failure.
Glad you found out and thanks for sharing !
Do you have any anti-virus running on your system ?
I do have anti-virus - up-to-date McAfee. Why do you ask? I (somewhat) regularly check the McAfee logs and never saw that it had quarantined any of the affected files.
Because they sometimes just delete generated executable without any notifications.