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This type was introduced so that we can have two sets of environment variables when manipulating aggregate projects (one for the aggregate, one for the aggregated projects). But we can have more than two project trees, since we have one per aggregated project. So creating a new type makes it possible to share it between trees. Tested on x86_64-pc-linux-gnu, committed on trunk 2011-08-03 Emmanuel Briot <briot@adacore.com> * prj-proc.adb, prj-ext.adb, prj-ext.ads, makeutl.adb, prj-tree.adb, prj-tree.ads, gnatcmd.adb, clean.adb (External_References): New type.
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