Wix Toolset - Variable Shared Across Projects/Solution - wix

Question

I am trying to share a variable across 2 of my wix projects but I am having issues.
Basically I am trying to accomplish having the version number of my bootstrapper and MSI in one file and then this referenced by the two projects.
I have three projects
Install - This is a setup project that creates an .msi file
Bootstrapper - This is a Wix Bootstrapper project that references and runs the .msi file at runtime
Shared - This is a wixlib project that contains a single variable in a fragment that is the version number
The shared project contains a single file i have called GlobalVars.wxs and looks like this
<?xml version="1.0" encoding="UTF-8"?>
<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi">
<Fragment>
<?define VersionNo = "6.86.123"?>
</Fragment>
</Wix>
The bootstrapper references this variable like this
<Bundle Name="ProgramName" Version="$(var.VersionNo)" Manufacturer="CompanyName" UpgradeCode="Guid" Compressed="no">
and the Install project references the variable like this - and has a reference to the .wxs from the shared project
<Product Id="*" Name="Program Name" Language="2057" Version="$(var.VersionNo)" Manufacturer="CompanyName" UpgradeCode="guid">
<Package InstallerVersion="200" Compressed="yes" InstallScope="perMachine" InstallPrivileges="elevated"/>
<?include GlobalVars.wxs ?>
Both projects have references setup to the wixlib project that contains the variable
When i attempt to build I am getting this error on both the install and bootstrapper project
Undefined preprocessor variable '$(var.VersionNo)'.
If the <?include?> tag resolved the issue I would expect the install project to build
Does anyone have any ideas as to what I might be doing wrong here?
To me it looks like the variable has not been defined by the time the build attempts to call it, but I am unsure as to show to change the order to ensure the variable is defined before anything else
Thanks for the help

Answer 1

I believe the answer to this question will help. I've used it and noticed that properties seem to be usable in my main wxs file.
To summarise, you need to set up a fake componentGroup in your library fragment, and use it in your installer. You do not need the include anymore, as long as the fake componentGroup from your fragment is referenced as a componentGroupRef in your main install, and your wixlib project is referenced in your installer project through VS (you said you'd already done this in your comments above).
Your library fragment might look something like this.
<Fragment id="fragment_id_may_not_be_needed">
<?define VersionNo = "6.86.123"?>
<ComponentGroup Id="c.define_version_num" />
</Fragment>
If the define for whatever reason doesn't work, try using a property instead. I'd be interested to know which works. Properties seem to work for me.
Then reference it in your main install like this:
<Feature Id="Main_installation" Title="Main installation" Level="1">
<!-- bringing in fragments from the shared libraries -->
<ComponentGroupRef Id="c.define_version_num" />
</feature>
Give it a whirl.