I am new to MSBuild and busy automating tests of Visual Studio solutions.
I previously worked with the command line of Devenv, which provides a convenient /Runexit mode of operation. From the manual:
/Runexit (devenv.exe)
Compiles and runs the specified solution, minimizes the IDE when the solution is run,
and closes the IDE after the solution has finished running.
This is exactly the functionality that I need. I am now migrating to MSBuild. I have discovered that the project files in the Solution can be directly used for building, as the default target is precisely Build.
What can I do to handle a different target, that will have the same effect as /Runexit ? Can you help me through the maze ?
This is the most basic Target which runs a projects' output file:
<Target Name="RunTarget">
<Exec Command="$(TargetPath)" />
</Target>
For c++ unittests I use something like this; it's a property sheet so it's easy to add to any project without needing to manually modify it. It automatcially runs the output after the build so there is no need to specify an extra target and it works the same for VS and from the command line. Moreover in VS you'll get unittest errors from frameworks like Unittest++ or Catch displayed right away in the error list, so you can doubleclick them. Also the UnitTestExtraPath property can be set elsewhere just in case (e.g. on a buildserver we always want to keep the PATH clean but sometimes we do need to modify it to run built exes).
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<ImportGroup Label="PropertySheets" />
<PropertyGroup Label="UserMacros" />
<PropertyGroup />
<ItemDefinitionGroup />
<ItemGroup />
<!--Used to be AfterTargets="AfterBuild", but that is unusable since a failing test marks the build as unsuccessful,
but in a way that VS will always try to build again. As a consequence debugging in VS is impossible since
VS will build the project before starting the debugger but building fails time and time again.-->
<Target Name="RunUnitTests" AfterTargets="FinalizeBuildStatus">
<Exec Condition="$(UnitTestExtraPath)!=''" Command="(set PATH="%PATH%";$(UnitTestExtraPath)) & $(TargetPath)" />
<Exec Condition="$(UnitTestExtraPath)==''" Command="$(TargetPath)" />
</Target>
</Project>
Related
We have a solution with around 70 projects. One of them takes relatively long (~10min) but does not use system resources. We also employ parallel build to speed things up.
When I (re)add this project to the solution, it is at the end of the build order. The machine is 100% busy when compilong 69 projects and then 10min idle when compiling the 70th. When I manually edit the .sln-file so that the project comes first in all lists, it is somewhere in the middle. How can I move it to the beginning?
This is not about dependencies. This project A has only one to another project B and I am fine if B is first as long as A is second. Also, no other projects depends on project A.
It sounds like you have already tried editing project dependencies in visual studio. If you have already edited it to make the project first, but it still takes a while then you probably should just take it out of the solution file. Then put the building of it into your own msbuild script where you can use the MSBuildExtensions parallel tasks to make it build at the same time as everything else:
See https://mikefourie.wordpress.com/2012/02/29/executing-msbuild-targets-in-parallel-part-1/
And I'm pretty sure the MSBuildExtensions library is a nuget package now as well.
VisualStudios sln-files are very limited and are written in a format defined decades ago. In fact, it is converted to a msbuild-script before doing anything useful.
To have more flexibility, I added an msbuild-script (master.msbuild) with something similar to this (untested but proper documentation is available)
<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<ItemGroup>
<ProjectsToBuild Include="longrunningproject.proj" />
<ProjectToBuild
Include="SolutionWithTheOther69Projects.sln"
Properties="Configuration=Debug;Platform=x86"/>
</ItemGroup>
<Target Name="Build" >
<MSBuild
Projects="#(ProjectsToBuild)"
Targets="Build"
BuildInParallel="true"
ContinueOnError="false"
Properties="VeloxVersion=$(VeloxVersion);RootDir=$(RootDir)"
/>
</Target>
</Project>
Projects are executed in order they are defined. Still no control what happens in the solution but I can put projects in front or behind it and can so influence the build order.
If the long-running task is called by an msbuild-exec-task, it is important to set the YieldDuringToolExecution-flag of this task. E.g.
<Exec
Command="..."
YieldDuringToolExecution="true"
/>
Otherwise, things are starting in parallel and then slowly dying off until the exec-task is done. I could not decode the logic behind that but honestly, I do not care.
After several days of try and error, the build machine screams at 100%-cpu-load, slowly come down to the one long-running task and then is done. Speedup-factor 2.5 :D
How can I move it to the beginning?
You can create a MSBuild project file named "before.<SolutionName>.sln.targets" in the same folder as your solution.
Then build the solution with command line (Visual Studio will ignore this file.), the before.<SolutionName>.sln.targets will be built before all of the Visual Studio projects in the solution.
In this case, we just need to build that special project in the before.<SolutionName>.sln.targets file, that special project will be built before all of projects in the solution.
The content of before.<SolutionName>.sln.targets like:
<?xml version="1.0" encoding="utf-8"?>
<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<Target Name="BuildSpecialProject" BeforeTargets="Build">
<Message Text="Build My Specify Project" />
<MSBuild Projects="Path\YouSpecialName.csproj"/>
</Target>
</Project>
Then build the solution file with command line with MSBuild or dotnet:
msbuild /t:build "<SolutionPath>\<SolutionName>.sln"
dotnet build "<SolutionPath>\<SolutionName>.sln"
Check this thread for some more details.
Hope this helps.
MSDN describes how to create a batch build, but does not provide a way to automate different batches (and one click solution for the GUI)
This question describes conditionally invoking a second build but doesn't appear to suffice for more than two sequential configurations
This question addresses the same situation, but again only for two configurations
In my test case, each configuration:
defines its own MACROS (which impact source code)
is applicable to multiple projects (class libraries). The projects are interdependent and require a specific build order in the context of the current configuration
I would like visual studio to build multiple configurations sequentially with a single build command.
Can child configurations be nested under a parent configuration, and be executed sequentially by visual studio when the parent configuration is built?
UPDATE : ATTEMPTED SOLUTION 1 [2016-03-11]
In response to Stijn's suggested answer I've tried the following:
Setup DotNetFramework 4.5 WinForms solution with 3 test projects and with 6 Configurations:
CORE_DEBUG
CORE_RELEASE
EXTENDED_DEBUG
EXTENDED_RELEASE
Debug
Release
The Debug Configuration must:
NOT trigger it's own configuration build (i.e. 'Debug')
must trigger the CORE_DEBUG and EXTENDED_DEBUG Configurations in sequence
I've added the following modified target to the first project's project file:
<Target Name="AfterBuild" Condition="'$(Configuration)|$(Platform)' == 'Debug|AnyCPU'">
Building with the 'Debug' Configuration now, causes an EXTENDED_RELEASE build to trigger. Having a look at the solution file, I see that Visual Studio decided to automatically link 'Debug' to 'EXTENDED_RELEASE':
{4F9706AA-26A9-483C-81C4-22E301C54C89}.Debug|Any CPU.ActiveCfg = EXTENDED_RELEASE|Any CPU
{4F9706AA-26A9-483C-81C4-22E301C54C89}.Debug|Any CPU.Build.0 = EXTENDED_RELEASE|Any CPU
Removing the above two lines from the solution file doesn't help, since Visual Studio just regenerates them. In summary this now has two undesirable outcomes:
Visual Studio executes a 'Debug' build for Project1
Visual Studio then executes an 'EXTENDED_RELEASE' for Project2 and Project3
Conclusion: While this approach can work, it also (first) performs debug and release configuration builds respectively. Visual Studio
also lists all 6 Configurations in the build menu (we only want Debug
and Release to be visible, and behind the scenes Debug must trigger
CORE_DEBUG and EXTENDED_DEBUG, and Release must trigger CORE_RELEASE
and EXTENDED_RELEASE)
UPDATE : ATTEMPTED SOLUTION 2 [2016-03-16]
Moving on to a makefile project solution: I've created a makefile project as specified by stijn's answer below, and it worked perfectly!
Conclusion : This is the preferred solution in my opinion because it gives the user the most power and ability to control exactly how the build(s) must be executed and how the configurations must be handled.
The principle of the second SO question can be adjusted to build more than one configuration/platform sequentially by just invoking MsBuild multiple times. For instance:
<Target Name="AfterBuild" Condition="'$(Configuration)|$(Platform)' == 'Debug|AnyCPU'">
<MSBuild Projects="$(MySolution)" Properties="Configuration=Release;Platform=x86"/>
<MSBuild Projects="$(MySolution)" Properties="Configuration=Debug;Platform=x64"/>
<MSBuild Projects="$(MySolution)" Properties="Configuration=Release;Platform=x64"/>
</Target>
This can be cleaned up by using item batching, removing the condition and instead automatically determining which config is invoked and then only building the others etc but that's a bit out of scope here.
I'm not really convinced doing this in an AfterBuild target is the best way though, because then you'd need to adjust one of your 'normal' projects to also trigger a build of everything else. An alternative is to add a MakeFile Project to your solution, set up it's dependencies so that it comes last in the build order (at least if that is what you need), and set it's command line to invoke msbuild in a way similar as described above. You can even keep all logic in the same project file: set the 'Build Command Line' to
msbuild $(MsBuildThisFile) /t:CustomBuild /p:Configuration=$(Configuration);Platform=$(Platform)
so building the project will 'recurse' and make it call itself again with the same properties as called with by VS, but executing the CustomBuild target where you can then build your other projects/solutions to taste.
EDIT re: update
You're almost there, but you have to go to Configuration Manager and make sure the configurations are setup properly to begin with. From the start:
create new solution, add 3 projects
right-click solution, select Configuration Manager
in the Active solution configuration combobox select new
enter CORE_DEBUG for name, select DEBUG under Copy settings from and make sure the Create new project configurations is checked like
repeat for other configurations
for EXTENDED_RELEASE for instance, it should now look like
you probably did most of this already, but somehow Debug got assigned to EXTENDED_RELEASE somehow so that is one thing you should fix; you could do that by editing the solution manually but instead of removing lines you'd have to edit them to be correct else VS just adds them again, as you noticed
Now open first project in a text editor and near the end of the file where AfterBuild is already inserted but commented out, add
<ItemGroup>
<Configurations Condition="'$(Configuration)'=='Debug'" Include="CORE_DEBUG;EXTENDED_DEBUG" />
<Configurations Condition="'$(Configuration)'=='Release'" Include="CORE_RELEASE;EXTENDED_RELEASE" />
<Projects Include="$(SolutionDir)WindowsFormsApplication1.csproj;$(SolutionDir)WindowsFormsApplication2.csproj;$(SolutionDir)WindowsFormsApplication3.csproj" />
</ItemGroup>
<Target Name="AfterBuild" Condition="'#(Configurations)' != ''">
<Message Text="Projects=#(Projects) Configuration=%(Configurations.Identity)" />
<MSBuild Projects="#(Projects)" Targets="Build" Properties="Configuration=%(Configurations.Identity)" />
</Target>
you might need to adjust the paths to the projects. This will build CORE_DEBUG and EXTENDED_DEBUG for Debug builds, and likewise for Release builds. AfterBuild is skipped when the Configurations ItemGroup is empty, i.e. when not building Debug or Release which is exactly the point.
EDIT re: makefile
You can specify multiple commands for the makefile commandline. Click the arrow next to the 'Build Command Line' box and select '' To be sure you have everything right, Configuration Manager has to be set up to only build the makefile project for Debug/Release like:
and the makefile project's commandline looks like
Alternatively, and I'd prefer this myself, you create an msbuild file with the same content as above:
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<ItemGroup>
<Configurations Condition="'$(Configuration)'=='Debug'" Include="CORE_DEBUG;EXTENDED_DEBUG" />
<Configurations Condition="'$(Configuration)'=='Release'" Include="CORE_RELEASE;EXTENDED_RELEASE" />
<Projects Include="$(SolutionDir)WindowsFormsApplication1.csproj;$(SolutionDir)WindowsFormsApplication2.csproj;$(SolutionDir)WindowsFormsApplication3.csproj" />
</ItemGroup>
<Target Name="Build" Condition="'#(Configurations)' != ''">
<Message Text="Projects=#(Projects) Configuration=%(Configurations.Identity)" />
<MSBuild Projects="#(Projects)" Targets="Build" Properties="Configuration=%(Configurations.Identity)" />
</Target>
</Project>
and your makefile command then invokes that file like
msbuild /path/to/msbuildfile /t:Build /p:Configuration=Debug;SolutionDir=$(SolutionDir)
How can a .cmd script run from within a Visual Studio (2005, 2008, 2010, 2012 and 2013 respectively) project's pre-link stage determine whether this is a full rebuild (Build.RebuildSolution/Build.RebuildOnlyProject) or "ordinary" build (Build.BuildSolution/Build.BuildOnlyProject)?
This is an external script (LuaJIT, if you must know) and I don't want to rebuild the library every single build of the project. Instead I'd like to limit the complete rebuild to situations where I choose exactly that option.
How can a .cmd script run from within a Visual Studio (2005, 2008, 2010, 2012 and 2013 respectively) project's pre-link stage determine whether this is a full rebuild ... or "ordinary" build ... ?
I do not know if the exact thing that you are asking can be done - perhaps someone else knows how to do it. I will, however, suggest an alternate approach.
My approach is to remove the build of the Lua library from the pre-link step to a separate Visual Studio NMake project. If you create an NMake project, you will be able to know which type of build (build or rebuild) is occurring.
Note that later versions of Visual Studio simply refer to the project type as "Make". For discussion purposes here, I will refer to the project type as "NMake". I believe this is just a naming difference, and that the underlying build project remains the same between the two versions.
As a simple test, I created two Visual Studio applications: 1) an NMake project that calls a batch file to create a static library, and 2) a console application that consumes the library from step 1.
The NMake Project
In Visual Studio, if you create a new NMake project, you will see a dialog that allows you to provide MS-DOS commands:
As you can see, there are commands for: Build, Clean, Rebuild, and others. I don't have a screen shot of the above dialog with my commands, but here is my NMake project's properties:
My Build command just checks for the existence of the output file (lua.lib). If it does not exist, then it calls the rebuild.bat batch file. My Rebuild command always calls the batch file. My Clean command just deletes the output. I am not really sure what the Output command is used for, but I just filled in the path to the build output (lua.lib).
Now if you do a build, the lua.lib file will only be created if it is not there. If it is already there, nothing is done. If you do a rebuild, then a new lua.lib file is created.
The Console Application
In my console application, I added a reference to the NMake project - this way the NMake project is built prior to the console application. Here is the console application's reference page:
I also added the lua.lib file as an input during the application's link stage:
When the console application is built (during a build), it will build the NMake project if needed, and use the output (lua.lib) during the linker stage. When the console application is rebuilt (during a rebuild), it will also rebuild the NMake project.
Other Thoughts
My screen shots above only show the debug version of the properties. Your projects will have to account for the release version. There probably is a VS macro to handle this, but I am not sure since it has been ages since I've done anything with C/ C++.
In my testing above I use a single build batch file for both the build and rebuild. Obviously, you could do the same or you could use different batch files.
It may be a bit of a hack, but in .csproj file there are sections
<Target Name="BeforeBuild">
</Target>
<Target Name="AfterBuild">
</Target>
You can set an variable from BeforeBuild and retrieve it from cmd script. Later on reset this variable in AfterBuild and you should be good to go.
Ok, this is going to be a long one.
First of all - do not take my code 'as is' - it is terrible one with lots of hacks, I had no idea msbuild is so broken by default (it seems at work I have access to waaaay more commands that make life easier). And another thing - it seems vcxproj is broken at some poin - I was not able to integrate the way I wanted with only BeforeRebuild and AfterRebuild targets - I had to redefine hole Rebuild target (it is located in C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets)
So, the idea is the following: when a Rebuild is happening we create an anchor. Then, during PreLink stage we execute cmd which is able to use created anchor. If the anchor is in place - we deal with Rebuild, if there is no anchor - it is a simple Build. After Rebuild is done - we delete the anchor.
modifications in vcxproj file:
<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
....
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
....
<PreLinkEventUseInBuild>true</PreLinkEventUseInBuild>
....
</PropertyGroup>
....
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
.....
<PreLinkEvent>
<Command>D:\PreLink\b.cmd</Command>
</PreLinkEvent>
.....
</ItemDefinitionGroup>
.....
<Target Name="BeforeRebuild">
<Exec Command="echo 2 > D:\PreLink\2.txt" />
</Target>
<Target Name="AfterRebuild">
<Exec Command="del D:\PreLink\2.txt" />
</Target>
<!-- This was copied from MS file -->
<PropertyGroup>
<_ProjectDefaultTargets Condition="'$(MSBuildProjectDefaultTargets)' != ''">$(MSBuildProjectDefaultTargets)</_ProjectDefaultTargets>
<_ProjectDefaultTargets Condition="'$(MSBuildProjectDefaultTargets)' == ''">Build</_ProjectDefaultTargets>
<RebuildDependsOn>
BeforeRebuild;
Clean;
$(_ProjectDefaultTargets);
AfterRebuild;
</RebuildDependsOn>
<RebuildDependsOn Condition=" '$(MSBuildProjectDefaultTargets)' == 'Rebuild' " >
BeforeRebuild;
Clean;
Build;
AfterRebuild;
</RebuildDependsOn>
</PropertyGroup>
<Target
Name="Rebuild"
Condition=" '$(_InvalidConfigurationWarning)' != 'true' "
DependsOnTargets="$(RebuildDependsOn)"
Returns="$(TargetPath)"/>
<!-- End of copy -->
</Project>
And the cmd looks like this:
if exist 2.txt (
echo Rebuild818181
) else (
echo Build12312312
)
The output from Output window:
1>Task "Exec" (TaskId:41)
1> Task Parameter:Command=D:\PreLink\b.cmd
1> :VCEnd (TaskId:41)
1> Build12312312 (TaskId:41)
Things to improve:
Use normal variables instead of external file (it seems MsBuild extension pack should do it)
Probably find a way to override only BeforeRebuild and AfterRebuild instead of the hole Rebuild part
It is much easier. Just add the following target to your build file or visual Studio Project
<Target Name="AfterRebuild">
<Message Text="AFTER REBUILD" Importance="High" />
<!--
Do whatever Needs to be done on Rebuild - as the message shows in VS Output
window it is only executed when an explicit rebuild is triggered
-->
</Target>
If you want a two step solution use this as a template:
<PropertyGroup>
<IsRebuild>false</IsRebuild>
</PropertyGroup>
<Target Name="BeforeRebuild">
<Message Text="BEFORE REBUILD" Importance="High" />
<PropertyGroup>
<IsRebuild>true</IsRebuild>
</PropertyGroup>
</Target>
<Target Name="BeforeBuild">
<Message Text="BEFORE BUILD: IsRebuild: $(IsRebuild)" Importance="High" />
</Target>
I have a simple MSBuild file that I'm learning with.
Here it is:
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" DefaultTargets="Clean" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<PropertyGroup Label="Globals">
<ProjectGuid>{D5A16164-962E-4A6D-9382-240F31AB6C50}</ProjectGuid>
</PropertyGroup>
<Target Name="Clean">
<ItemGroup>
<BinFiles Include="bin\*.*" />
<fff Include="f\*.*" />
</ItemGroup>
<Delete Files="#(BinFiles)" />
<Delete Files="#(fff)" />
</Target>
</Project>
Now I want to include this in a Visual Studio solution and be able to run the "clean" target from Visual Studio 2012. I tried naming it testproject.msbuildproj like the internet seems to suggest "works", but it doesn't work. When I run the clean command I just get "unexpected error".
If I rename the project to testproject.csproj, it does some unintuitive things like creating compilation directories, but it does actually run my clean command properly. However, this is undesireable because it creates obj and bin/x86/debug type directories. It also looks goofy in Visual Studio because it still gives the References drop down.
How can I use just a plain vanilla MSBuild project from Visual Studio without random errors or false assumptions?
Note I only am having a problem with this from Visual Studio. Using msbuild from the command line it works perfectly
Visual Studio creates bin / obj folders when it opens csproj file. When you click Build / Rebuild / Clean it just uses appropriate targets from the project file.
You cannot stop VS from creating these folders, but you can ask it to create them in say temp folder by setting appropriate properties - refer this MSDN article for details.
So the steps are to rename your project to csproj, and add the following lines into project:
<PropertyGroup>
<OutputPath>$(Temp)\bin</OutputPath>
<IntermediateOutputPath>$(Temp)\obj</IntermediateOutputPath>
</PropertyGroup>
I usually use a bit different approach to work with MSBUILD files from VS:
I use regular csproj file with removed Import ... CSharp.targets part as pure container for my Build projects.
I add actual build files with targets and logic, and all properties, necessary artifacts like XSLT etc using "Include into project", so I can manage hierarchy and change any file from within VS.Net.
I redefine Build / Rebuild targets in csproj file for whatever I need, for example Build may contain minimum output, and while rebuild diagnostic one.
Like this:
<Target Name="Build">
<Exec Command="%windir%\Microsoft.NET\Framework64\v4.0.30319\msbuild.exe Builds\build.proj /t:Build /v:m" />
</Target>
<Target Name="Rebuild">
<Exec Command="%windir%\Microsoft.NET\Framework64\v4.0.30319\msbuild.exe Builds\build.proj /t:Build /v:d" />
</Target>
I've got an x86 Visual Studio solution with many project files in it. Some of the DLL files are designed to work as plug-ins to other applications on a user's system.
We're expanding some of the DLL files to be able to support 64-bit applications. I'd like to set up the solution/projects so that just hitting "Build" will build both the x86 and x64 versions of those DLL
files. The solution contains both C++ and C# projects.
I realize that "Batch Build" is capable of building both, though it would be more convenient if developers could just click the same button as they have previously and have all of the output DLL files generated.
Here are a couple of the modifications that I've tried to a test project, but that I haven't gotten to work:
I've tried modifying the <Target Name="AfterBuild"> to try:
<Target Name="AfterBuild" Condition=" '$(Platform)' == 'x86' ">
<PropertyGroup>
<Platform>x64</Platform>
<PlatformTarget>x64</PlatformTarget>
</PropertyGroup>
<CallTarget Targets="Build"/>
</Target>
But that results in the following error:
C:\Windows\Microsoft.NET\Framework\v3.5\Microsoft.Common.targets(565,5): error MSB4006: There is a circular dependency in the target dependency graph involving target "Build".
I think my conditions will prevent infinite recursion, but I understand how MSBuild could not see it that way.
I've also tried:
<Project DefaultTargets="MyBuild86;MyBuild64" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="3.5">
...
<Target Name="MyBuild86">
<PropertyGroup>
<Platform>x86</Platform>
<PlatformTarget>x86</PlatformTarget>
</PropertyGroup>
<CallTarget Targets="Build"/>
</Target>
<Target Name="MyBuild64">
<PropertyGroup>
<Platform>x64</Platform>
<PlatformTarget>x64</PlatformTarget>
</PropertyGroup>
<CallTarget Targets="Build"/>
</Target>
But my DefaultTargets appears to be ignored from within the Visual Studio IDE.
Last, I've tried creating a separate project that imports the first project:
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="3.5" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<PropertyGroup>
<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
<Platform>x64</Platform>
<PlatformTarget>x64</PlatformTarget>
<ProductVersion>9.0.30729</ProductVersion>
<SchemaVersion>2.0</SchemaVersion>
<OutputPath>..\$(Configuration)\x64\</OutputPath>
<ProjectGuid>{A885CAC3-2BBE-4808-B470-5B8D482CFF0A}</ProjectGuid>
</PropertyGroup>
<Import Project="BuildTest.csproj" />
</Project>
And this so far has shown the most promise. However, Visual Studio seems to ignore my OutputPath setting from this new project and instead outputs the EXE/DLL file to the path specified in the original project. There isn't any PropertyGroup block that I can see that is being executed in the original project to override this, so I'm not sure what's happening.
We do something similar to build core assemblies for .NET Compact Framework.
Try this:
<Target Name="AfterBuild">
<MSBuild Condition=" '$(Platform)' == 'x86' " Projects="$(MSBuildProjectFile)" Properties="Platform=x64;PlatFormTarget=x64" RunEachTargetSeparately="true" />
</Target>
Importing a project in such manner works for me in Visual Studio 2010:
TestProject64.vcxproj
<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<Import Project="TestProject.vcxproj" />
<ItemGroup Label="ProjectConfigurations">
<ProjectConfiguration Include="Release|x64">
<Configuration>Release</Configuration>
<Platform>x64</Platform>
</ProjectConfiguration>
</ItemGroup>
<PropertyGroup Label="Globals">
<ProjectGuid>{B7D61F1C-B413-4768-8BDB-31FD464AD053}</ProjectGuid>
</PropertyGroup>
</Project>
TestProject64.vcxproj.filters
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<Import Project="TestProject.vcxproj.filters" />
</Project>
TestProject.vcxproj has two configurations defined inside: Release|x86 and Release|x64. As you can see, TestProject64.vcxproj has only the Release|x64 configuration. Defining of at least one configuration in TestProject64.vcxproj is necessary, otherwise Visual Studio will not be able to add TestProject64.vcxproj to a solution.
Now it's possible to include both TestProject.vcxproj and TestProject64.vcxproj to the same solution and build Release|x86 and Release|x64 at the same time.
I think the best way of doing this is to invoke MSBuild from the command line. It shouldn't need editing of MSBuild files. Just run
msbuild myproj.sln /p:Configuration="Debug|Win32"
msbuild myproj.sln /p:Configuration="Debug|x64"
I assume that if a developer is using Visual Studio then they'll only be generating the DLL files so they can debug with them, and that you have a separate build process if you're actually deploying the DLL files.
For C++, and if it's a project whose files/settings don't change often, one way to do it is create two projects within the solution, with both projects referring to the same source files. Then, in x64 builds, set one project to build 64-bit and the other 32-bit. (In x86 builds, set one as 32-bit and turn off the other.)
We've been using this for a while and it works fine.
Of course, you have to be careful that any changes you make to one are also made to its copy. i.e. if you add/remove a file or change its build setting, you have to do it in two places. Source-code changes still only need to be done once, because there's still only one copy of each source file.
And, of course, you may decide that doing this is more complex/risky than switching away from using the IDE. In our case it's worked really well, though.
You are not going to be able to do this with the UI of Visual Studio. For this you will need to hack the MSBuild files.
Try this link from MSDN for MSBuild Overview
I would suggest to create a dummy C++ Makefile project and then invoke MSBuild twice from it:
msbuild myproj.sln /p:Configuration="Debug|Win32"
msbuild myproj.sln /p:Configuration="Debug|x64"
Perhaps I've missed the point of this discussion.
Using Visual Studio, go to menu Build → Configuration Manager. In the Active Solution Platform drop down, select "New...", and a New Solution Platform dialog appears. Select x64 and accept the default Copy From. Close the dialog and the Configuration Manager.
Now open menu Build → Batch Build. Check those configurations you want to build and build them. You will find the x64 build executables separate from the Win32 executable files.
You can verify that these are what was intended by right clicking on the executable files, selecting Properties, and select the Compatibility tab. In the dropdown window you can check to see what operating systems the executable file can be run in.
Obviously, there may be some other tweaking you might have to do to get all the output files in their proper places, but this method seem somewhat simpler than fooling with build than those described above.
I ran into this problem with a project running in Visual Studio 2008 (on Windows XP) (32-bit) and also Visual Studio 2010 (on Windows 7) (64-bit).
The solution I used was to use the $(PROGRAMFILES) variable. It resolved correctly on both machines.