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-rw-r--r--libbuild2/config/init.cxx27
1 files changed, 27 insertions, 0 deletions
diff --git a/libbuild2/config/init.cxx b/libbuild2/config/init.cxx
index 87b492c..e92db4c 100644
--- a/libbuild2/config/init.cxx
+++ b/libbuild2/config/init.cxx
@@ -247,6 +247,18 @@ namespace build2
auto& c_v (vp.insert<uint64_t> ("config.version", false /*ovr*/, v_p));
auto& c_l (vp.insert<paths> ("config.config.load", true /* ovr */));
+ // Configuration variables to disfigure.
+ //
+ // The exact semantics is to ignore these variables when loading
+ // config.build (and any files specified in config.config.load), letting
+ // them to take on the default values (more precisely, the current
+ // implementation undefined them after loading config.build).
+ //
+ // Note that this variable is not saved in config.build and is expected
+ // to always be specified as a command line override.
+ //
+ auto& c_d (vp.insert<strings> ("config.config.disfigure", true /*ovr*/));
+
// Hermetic configurations.
//
// A hermetic configuration stores environment variables that affect the
@@ -424,6 +436,21 @@ namespace build2
}
}
+ // Undefine variables specified with config.config.disfigure.
+ //
+ if (const strings* vs = cast_null<strings> (rs[c_d]))
+ {
+ for (const string& v: *vs)
+ {
+ // An unknown variable can't possibly be defined.
+ //
+ if (const variable* var = vp.find (v))
+ {
+ rs.vars.erase (*var); // Undefine.
+ }
+ }
+ }
+
// Save and cache the config.config.persist value, if any.
//
if (m != nullptr)