Cannot build MySQL plugin

george

Thank you for your response.

When you use MSVC you have to open the correct visual studio command prompt.

Is this the one shown in the screenshot?
alt text

SGaist

Hi,

If it's the one matching the Qt version used in your Kit then yes.

george

Hi SGaist,
alt text
I think it is, because I've installed only the MSVC 64bit compiler
Therefore it is not the set up of my environment, the reason I cannot build the plugin...

SGaist

You should check the test logs generated to see what exactly failed when the detection ran.

george

Could you please point me out where I can find these test logs?

SGaist

In the folder where you call qmake.

george

In the folder where you call qmake.

I call the qmake from the folder:
C:\Qt\5.14.2\Src\qtbase\src\plugins\sqldrivers\mysql
In the following image there is a list of all files. There is no log files there (all subfolders are empty)
alt text

http://www.mediafire.com/view/vgec6rp2ldmf9lh/qt%25235.jpg/file

kshegunov

Hi,
Open the .pro file for the plugin and change the line which reads:

QMAKE_USE += mysql

to:

# QMAKE_USE += mysql

Then rerun qmake and build with make/nmake. Then you can see what the compiler complained about exactly. Do let us know, I had that problem compiling psql because I mixed the arch by accident.

george

Hi kshegunov,
Although I don't know what the QMAKE_USE += mysql instruction does, I understand that the '#' symbol is for remarks
I followed your instruction.
From the command prompt, I am getting no messages, so I opened the project from the creator and there are no errors.
The compiler output window among other displays something about "win32-msvc", but I've the 64bit version installed:

20:06:46: Running steps for project mysql...
20:06:46: Starting: "C:\Qt\5.14.2\msvc2017_64\bin\qmake.exe" C:\Qt\5.14.2\Src\qtbase\src\plugins\sqldrivers\mysql\mysql.pro -spec win32-msvc "CONFIG+=debug" "CONFIG+=qml_debug"

In the following image you can see the full compiler output
alt text
http://www.mediafire.com/view/vfi179q0efuqh5t/qt%25236.jpg/file
But if everything is OK, where is the plugin? I searched for a ".dll" file in the subfolders but all they are empty

Christian Ehrlicher

You did not follow the documentation - you have to run qmake in the sqldrivers subdir...

kshegunov

@george said in Cannot build MySQL plugin:

From the command prompt, I am getting no messages, so I opened the project from the creator and there are no errors.

You didn't invoke the generated makefile as far as I could see from your screenshot. So I wouldn't expect you to see any messages. ;) After you run the qmake, you do need to call nmake to start things rolling.

@Christian-Ehrlicher said in Cannot build MySQL plugin:

You did not follow the documentation - you have to run qmake in the sqldrivers subdir...

True, but don't lose patience on us. He just tried to follow what I asked, have some faith. ;)

george

First of all, I would like to thank you for spending your valuable time, reading my posts and try to guide me.
It is true that I went a step forward. First I ran the vcvarsall.bat (I did not execute this batch file before). I suppose that sets some environment variables, right?
From the command prompt and in the following directory: "C:/Qt/15.4.2/Src/qtbase/src/sqldrivers" I build the plugin as follows:

qmake -- MYSQL_INCDIR="C:/Program Files/MySQL/MySQL Connector C 6.1/include" MYSQL_LIBDIR="C:/Program Files/MySQL/MySQL Connector C 6.1/lib"

Here is the output:
alt text
http://www.mediafire.com/view/swazfssbaa0dg2u/qt%25237.jpg/file
But what is the next step?
If I enter:

nmake sub-mysql

as manual says, I am getting the following errors:

Microsoft (R) Program Maintenance Utility Version 14.16.27035.0
Copyright (C) Microsoft Corporation.  All rights reserved.

        cd mysql\ && ( if not exist Makefile C:\Qt\5.14.2\msvc2017_64\bin\qmake.exe -o Makefile C:\Qt\5.14.2\Src\qtbase\src\plugins\sqldrivers\mysql\mysql.pro ) && "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\nmake.exe" -f Makefile

Microsoft (R) Program Maintenance Utility Version 14.16.27035.0
Copyright (C) Microsoft Corporation.  All rights reserved.

        "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\nmake.exe" -f Makefile.Release all

Microsoft (R) Program Maintenance Utility Version 14.16.27035.0
Copyright (C) Microsoft Corporation.  All rights reserved.

        link /NOLOGO /DYNAMICBASE /NXCOMPAT /DEBUG /OPT:REF /INCREMENTAL:NO /DLL /SUBSYSTEM:WINDOWS /VERSION:5.14 /OUT:..\plugins\sqldrivers\qsqlmysql.dll @C:\Users\George\AppData\Local\Temp\nmEA57.tmp
LINK : fatal error LNK1181: cannot open input file 'lmysql.obj'
NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\link.EXE"' : return code '0x49d'
Stop.
NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\nmake.exe"' : return code '0x2'
Stop.
NMAKE : fatal error U1077: 'cd' : return code '0x2'
Stop.

kshegunov

@george said in Cannot build MySQL plugin:

LINK : fatal error LNK1181: cannot open input file 'lmysql.obj'

Do you by any chance use a statically built Qt? This linker error is rather odd.

george

@kshegunov said in Cannot build MySQL plugin:

Do you by any chance use a statically built Qt?

Hmm... How can I check this?
I searched my entire hard drive for the file "lmysql.obj", but I found nothing

Christian Ehrlicher

Please make sure that there are no leftovers in the sqldrivers subdir (best is to remove this subdir and unpack it again) and try again.

kshegunov

@george said in Cannot build MySQL plugin:

I searched my entire hard drive for the file "lmysql.obj", but I found nothing

Hence I was suspicious. How did you obtain the sources, did you clone them from git or unpacked them from an archive, or maybe installed them through the maintenance tool? Christian's advice is a good one at this point, you want to make sure there are no leftovers because that can break the build.

george

I'll uninstall the Qt entirely and I'll delete the Qt folder.
Then, I'll install from scratch the SDK using the online installer (only the MSVC 64 bit compiler)
Then I'll let you know since the installation will take some time.

kshegunov

Sounds like a plan.

@george said in Cannot build MySQL plugin:

Then, I'll install from scratch the SDK using the online installer (only the MSVC 64 bit compiler)

One one note here, make sure that the SDK architecture (and compiler) you select matches the one of your command prompt that you're going to use. I had experienced this cryptic error when I tried to compile the PSQL driver with a 64 bit msvc, while my Qt distro was for 32 bit msvc. I know it sounds silly but it's an easy error to make, and not very obvious if you actually make it.

george

@kshegunov said in Cannot build MySQL plugin:

make sure that the SDK architecture (and compiler) you select matches the one of your command prompt that you're going to use

I noticed that the installer, creates only those command prompts shortcuts in the windows start menu that they correspond to the compiler versions chosen during the installation.
I choose only one compiler to avoid such errors. When I will get better knowledge of how Qt works then, I'll proceed with other compilers too

george

Now I have a fresh installation of Qt in my hard drive
Before I start, I am wondering if I have to modify the project file

mysql.pro

in the following folder:

C:\Qt\5.14.2\Src\qtbase\src\plugins\sqldrivers\mysql

as I did in my first post. I had added the following lines:

INCLUEPATH += C:/Program Files/MySQL/MySQL Connector C 6.1/include
QMAKE_LIBDIR += C:/Program Files/MySQL/MySQL Connector C 6.1/lib
LIBS += -lmysql