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Nicely formatted version: https://gist.github.com/jonpryor/661edf823539c06cb4cce9ccb4c8ab47
When you have item metadata which uses a property which uses an item group, the item group isn't properly expanded into the item metadata.
<JdkIncludePath Include="/something" />
<JdkIncludePath Include="/something-else" />
<_JdkIncludePaths>@(JdkIncludePath->'-I%(Identity)', ' ')</_JdkIncludePaths>
Note: above code can't be used as-is, because properties are expanded before items in a single file. The above can be reproduced by using <Import/>s plus multiple files. The above gist.github.com url has actual file contents.
When using `xbuild` and `msbuild` from mono 4.6, `%(_HostRuntime.CFlags)` has the expected value of `-I/something -I/something-else".
When using `msbuild` from Mono 4.8, `%(_HostRuntime.CFlags)` expands to the empty string.
Created attachment 19904 [details]
Test case. Unzip, then build `expansion.targets`:
$ unzip bxc-52673
$ cd bxc-52673
$ msbuild /v:minimal expansion.targets
Microsoft (R) Build Engine version 18.104.22.168
Copyright (C) Microsoft Corporation. All rights reserved.
CFlags: works-with-mono-4.8: -I/something -I/something-else
Filed upstream as https://github.com/Microsoft/msbuild/issues/1824 .