How do I resolve error MSB6006: "cmd.exe" exited with code 3?

Question

I am getting the following error when building my code:

C:\Program Files 
(x86)\MSBuild\Microsoft.Cpp\v4.0\Microsoft.CppCommon.targets(151,5): error      
MSB6006: "cmd.exe" exited with code 3.
Done executing task "CustomBuild" -- FAILED. (TaskId:40)

How do I resolve this?

Answer 1

Open your .vcxproj file as a .xml file (so with Notepad++ or equivalent.)

You should be able to search the file for the "CustomBuild" tag.

Something in the task defined by that tag is failing.

You can test what it is by trying to run the commands in that task from the command line in the same directory as the .vcxproj.

If you can't solve your problem from there I'd recommend adding the "CustomBuild" task to the question so we can better help you.

Answer 2

 <QtMsBuild>$(MSBuildProjectDirectory)\QtMsBuild</QtMsBuild>
  </PropertyGroup>
  <Target Name="QtMsBuildNotFound" BeforeTargets="CustomBuild;ClCompile" Condition="!Exists('$(QtMsBuild)\qt.targets') or !Exists('$(QtMsBuild)\qt.props')">
    <Message Importance="High" Text="QtMsBuild: could not locate qt.targets, qt.props; project may not build correctly." />
  </Target>

/////////////////

 <CustomBuild Include="temp\moc\moc_predefs.h.cbt">
      <FileType>Document</FileType>
      <AdditionalInputs Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">..\..\..\..\QTINSTALL\5.9.3\5.9.3\MSVC2015\mkspecs\features\data\dummy.cpp;%(AdditionalInputs)</AdditionalInputs>
      <Command Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">cl -Bx"$(QTDIR)\bin\qmake.exe" -nologo -Zc:wchar_t -FS -Zc:rvalueCast -Zc:inline -Zc:strictStrings -Zc:throwingNew -O2 -MD -W3 -w34100 -w34189 -w44996 -w44456 -w44457 -w44458 -wd4577 -wd4467 -E ..\..\..\..\QTINSTALL\5.9.3\5.9.3\MSVC2015\mkspecs\features\data\dummy.cpp 2&gt;NUL &gt;temp\moc\moc_predefs.h</Command>
      <Message Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">Generate moc_predefs.h</Message>
      <Outputs Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">temp\moc\moc_predefs.h;%(Outputs)</Outputs>
      <AdditionalInputs Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">..\..\..\..\QTINSTALL\5.9.3\5.9.3\MSVC2015\mkspecs\features\data\dummy.cpp;%(AdditionalInputs)</AdditionalInputs>
      <Command Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">cl -Bx"$(QTDIR)\bin\qmake.exe" -nologo -Zc:wchar_t -FS -Zc:rvalueCast -Zc:inline -Zc:strictStrings -Zc:throwingNew -Zi -MDd -W3 -w34100 -w34189 -w44996 -w44456 -w44457 -w44458 -wd4577 -wd4467 -E ..\..\..\..\QTINSTALL\5.9.3\5.9.3\MSVC2015\mkspecs\features\data\dummy.cpp 2&gt;NUL &gt;temp\moc\moc_predefs.h</Command>
      <Message Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">Generate moc_predefs.h</Message>
      <Outputs Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">temp\moc\moc_predefs.h;%(Outputs)</Outputs>
    </CustomBuild>

I'm in the same question. Here's some of my custom build, I've just copied a project from another computer, I've already set Qt vs tools and vs's addtional lib\\include, it's still not working.