Building C/C++ projects


AppVeyor provides several build worker images with Visual Studio.

Additionally, LLVM/Clang, MinGW and MinGW-w64 compiler infrastructures are also available.

Visual Studio

Build configured with standard Visual Studio projects does not require any extra steps to setup build environment.

Build configured with makefiles or any scripts directly invoking compiler executable require enabling the Visual C++ toolset for the command-line builds.

Run the following in the appveyor.yml:

  • For 32-bit target

      call "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" x86
  • For 64-bit target

      call "C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin\SetEnv.cmd" /x64
      call "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" x86_amd64

Now, Visual C++ tools (cl.exe, link.exe and others) should be available in the PATH and required variables for CL environment and LINK enviornment set properly for command-line builds.


Visual Studio project select a toolchain based on the <PlatformToolset /> element. To avoid potential problems project files should use the variable DefaultPlatformToolset as the value. Hardcoded values, like v100 (Visual Studio 2010) and v110 (Visual Studio 2012), can cause problems on some build worker images.

The PlatformToolset value should be set after Microsoft.Cpp.Default.props properties are imported. An example is shown below.

<Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
<PropertyGroup Label="PlatformToolset">

If you are building with custom rules which may cause DefaultPlatformToolset to be undefined, then you can use the following to ensure PlatformToolset has a minumum value.

<!-- Use DefaultPlatformToolset after Microsoft.Cpp.Default.props -->
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />

<!-- Set DefaultPlatformToolset to v100 (VS2010) if not defined -->
<PropertyGroup Label="EmptyDefaultPlatformToolset">
    <DefaultPlatformToolset Condition=" '$(DefaultPlatformToolset)' == '' ">v100</DefaultPlatformToolset>

<!-- Use DefaultPlatformToolset to set PlatformToolset -->
<PropertyGroup Label="PlatformToolset">
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