Cannot Run Compiler 'cl'

webzoid · wrote on 13 Jul 2017, 17:10

I've recently updated my Qt to include version 5.9.1 as well as update Qt Creator to 4.3.1. I've previously had Qt 5.7.0 installed and working a treat, using the MSVC 2015 x86 and x64 compilers.

Now, when I try to build a project within Qt Creator, it fails almost immediately with the following error:

Cannot run compiler 'cl'. Maybe you forgot to setup the environment?

If I bring up the Developer Command Prompt for VS2015, I can see that cl is clearly recognized as a tool.

When I check the Qt Kits, all kits have a yellow exclamation mark next to them reporting the following warnings:

CMake configuration has no path to a C compiler set, even though the kit has a valid toolchain

CMake configuration has no path to a C++ compiler set, even though the kit has a valid toolchain

All 32bit kits have the Microsoft Visual C++ Compiler 14.0 (x86) C/C++ compilers set and the 64bit ones have the Microsoft Visual C++ Compiler 14.0 (x86_amd64) C/C++ compilers set.

I'm not really sure what has happened as it was working great with Qt 5.7.0 prior to the updates.

SGaist · wrote on 13 Jul 2017, 21:35

Hi,

Might be a silly question but are you sure you installed the VS2015 package of Qt 5.9.1 ?

webzoid · wrote on 13 Jul 2017, 21:38

Hi, I've already had the same thought.

But yes, the VS2015 package has been installed - for all versions of Qt on my machine.

SGaist · 14 Jul 2017, 16:23

Then you should go in the Build and Run panel in the preferences and check if everything is ok with your Kits.

webzoid · S SGaist 13 Jul 2017, 22:13

I've already done that - see my first post, the kits are coming up with those warnings.

When I switch to the CMake tab, there are no cmakes detected - but there were none previously prior to my Qt update.

SGaist · wrote on 14 Jul 2017, 21:42

cmake is innocent.

Can you show a picture of your Kits, Qt versions and compiler panels ?

webzoid · wrote on 15 Jul 2017, 17:42

As requested, here are links to screen captures taken from Qt Creator:

Qt Kits - https://drive.google.com/open?id=0Bw0lw24F4HvodExlT3J6eDRTSk0

Qt Compilers - https://drive.google.com/open?id=0Bw0lw24F4HvoaXctQkQtc3Bsd0E

Qt Build & Run - https://drive.google.com/open?id=0Bw0lw24F4HvoZ3pBWjZ1RUROUmM

Ignore the 5.9.1 MSVC2013 kit - I haven't got the correct Visual Studio compiler installed for that one.

SGaist · wrote on 15 Jul 2017, 22:05

Another strange thing is that you have the x64 debugger selected for your 32bit Qt build.

webzoid · wrote on 16 Jul 2017, 07:31

Good point although I'd be happy if I could get to the debugging phase. As soon as I click build (qmake runs fine), the error appears and I can do nothing else.

Maybe I'll reinstall Visual Studio...

I've already tried reinstalling Qt but this made no difference.

SGaist · 17 Jul 2017, 12:03

Still the same error ?

webzoid · 17 Jul 2017, 12:19

Yep, exactly the same error... bizarre

webzoid · 17 Jul 2017, 13:18

Ok, so something I've just discovered.

Under the Options -> Qbs ->Profiles, when I select the 5.9.1 MSVC2015 32-bit kit and I examine the cpp values, the compilerName is empty as is the toolchainInstallPath. Incidentally, on another machine which works these values are set to cl.exe and the VC/Bin path of the Visual Studio directory.

The question is, how would one change these values?

webzoid · wrote on 17 Jul 2017, 13:18

Meh, it makes no difference - managed to change the values to reflect that of my working system but it still doesn't work. I also installed cmake to reduce the number of differences but again, doesn't fix the issue.

SGaist · 18 Jul 2017, 19:17

Just realised something, you have a QBS project failing ?

If so, does a classic qmake project work ?

webzoid · S SGaist 18 Jul 2017, 07:29

It is a Qt Widgets application that is failing - I'm not certain what a Qbs project is. I was purely looking for differences between a known working Qt setup and my current setup.

SGaist · wrote on 18 Jul 2017, 23:24

It's a project using the QBS project manager rather than qmake.

Brian Dolan · wrote on 20 Jul 2017, 20:35

Hi webzoid,

I don't have an exact solution for you, but maybe some helpful information:

I just encountered a very similar problem - we have a command line build and somewhat-complex make system here which calls qmake, etc. via a command line. This make system was built around Qt 5.5.1, and uses the "win32-msvc2015" make spec (e.g. qmake -spec win32-msvc2015). I attempted to use the latest Qt 5.9.1, and our make system failed because the Qt "mkspecs" folder in Qt 5.9.1 now contains a single "win32-msvc" folder, instead of separate "win32-msvc2005", "win32-msvc2008", "win32-msvc2010", "win32-msvc2012", "win32-msvc2013", and "win32-msvc2015" folders as it did in Qt 5.5.1.

I attempted to do some copying/pasting/renaming of folders in order to get our existing make system to build with Qt 5.9.1 (without editing our make system, for reasons I won't get into), but was not successful - the build got farther, past the "Could not find qmake configuration file win32-msvc2015" error I had been seeing, but hit an error similar to what you are seeing: "Project ERROR: Cannot run compiler 'cl'. Maybe you forgot to setup the environment?".

In the end, it was not important for me to use the absolute latest version (Qt 5.9.1), and instead I worked around the problem by just using Qt 5.6.2 instead, which has a folder structure similar to Qt 5.5.1 (what our make system was built around).

My guess is that there was some restructuring done around the MSVC make specs in recent Qt versions, and maybe in other MSVC-build-related areas, which is somehow related to your issue.

(Just some information...)

-Brian

webzoid · 29 Jan 2018, 15:18

@Brian-Dolan Thanks for your reply and thanks for the extra information. It got to the point where I uninstalled Qt AND Visual Studio then re-installed both just to see what would happen. When I re-installed Qt Creator, the same problems arose.

It almost had me beat but after a little bit more digging, I've finally managed to sort it.

When I executed the vcvarsall.bat file from within the Visual Studio / VC directory, I noticed that a couple of issues were being reported in the command line - notably that MySQL command not found which I thought rather odd - what would MySQL have to do with a Visual Studio install?

Anyhoo, having then removed anything and everything MySQL-related from my system, running the vcvarsall.bat again yielded no reported issues. I then ran Qt Creator again using a simple example application and now everything works perfectly. All I can think of is that when the vcvarsall.bat returns an exit code, it was not the exit code expected by Qt Creator due to the MySQL issues. Either that or there was a lingering bath path around used by MySQL which no longer existed and was throwing the toolchain.

Either way, I'm back in business! Thanks for all the comments and help with this.

SGaist · wrote on 22 Jul 2017, 20:33

Well that was a tricky one...

Thanks for sharing your findings !

Since you have it working now, please mark the thread as solved using the "Topic Tools" button so that other forum users may know a solution has been found :)

deleted357 · wrote on 19 Dec 2017, 16:54

For me, I had to install Visual C++ 2015 Build Tools for resolving the error (http://landinghub.visualstudio.com/visual-cpp-build-tools).
Batch file C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat didn't found C:\Program Files (x86)\Microsoft Visual C++ Build Tools folder.

Best regards.