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-rw-r--r--libbuild2/config/init.cxx41
1 files changed, 34 insertions, 7 deletions
diff --git a/libbuild2/config/init.cxx b/libbuild2/config/init.cxx
index 774ffb8..73c9d37 100644
--- a/libbuild2/config/init.cxx
+++ b/libbuild2/config/init.cxx
@@ -243,12 +243,23 @@ 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 */));
+ // Omit loading the configuration from the config.build file (it is
+ // still loaded from config.config.load if specified). Similar to
+ // config.config.load, only values specified on this project's root
+ // scope and global scope are considered.
+ //
+ // Note that this variable is not saved in config.build and is expected
+ // to always be specified as a command line override.
+ //
+ auto& c_u (vp.insert<bool> ("config.config.unload", 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).
+ // implementation undefined them after loading config.build). See also
+ // config.config.unload.
//
// Note that this variable is not saved in config.build and is expected
// to always be specified as a command line override.
@@ -352,9 +363,10 @@ namespace build2
save_null_omitted | save_empty_omitted | save_base,
&save_environment);
- // Load config.build if one exists followed by extra files specified in
- // config.config.load (we don't need to worry about disfigure since we
- // will never be init'ed).
+ // Load config.build if one exists (and unless config.config.unload is
+ // specified) followed by extra files specified in config.config.load
+ // (we don't need to worry about disfigure since we will never be
+ // init'ed).
//
auto load_config = [&rs, &c_v] (istream& is,
const path_name& in,
@@ -403,11 +415,26 @@ namespace build2
load_config (open_file_or_stdin (fn, ifs), fn, l);
};
+ // Load config.build unless requested not to.
+ //
{
- path f (config_file (rs));
+ // The same semantics as in config.config.load below.
+ //
+ bool u;
+ {
+ lookup l (rs[c_u]);
+ u = (l &&
+ (l.belongs (rs) || l.belongs (ctx.global_scope)) &&
+ cast_false<bool> (l));
+ }
- if (exists (f))
- load_config_file (f, l);
+ if (!u)
+ {
+ path f (config_file (rs));
+
+ if (exists (f))
+ load_config_file (f, l);
+ }
}
if (lookup l = rs[c_l])