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authorBoris Kolpackov <boris@codesynthesis.com>2021-03-19 15:38:34 +0200
committerBoris Kolpackov <boris@codesynthesis.com>2021-03-19 15:38:34 +0200
commite94354ceef93f45b0a95f35eee62750876ec936b (patch)
tree11b454f999e4d7b873eb9be772a7c014fc522e00
parent14b8aa90926bdc7233caa926d81984c6593e1f76 (diff)
Redo entering of src directories into scope_map
-rw-r--r--build2/b.cxx8
-rw-r--r--libbuild2/algorithm.cxx4
-rw-r--r--libbuild2/bash/rule.cxx2
-rw-r--r--libbuild2/cc/compile-rule.cxx30
-rw-r--r--libbuild2/config/operation.cxx8
-rw-r--r--libbuild2/context.cxx6
-rw-r--r--libbuild2/dist/operation.cxx8
-rw-r--r--libbuild2/dump.cxx10
-rw-r--r--libbuild2/file.cxx26
-rw-r--r--libbuild2/operation.cxx6
-rw-r--r--libbuild2/scope.cxx118
-rw-r--r--libbuild2/scope.hxx95
-rw-r--r--libbuild2/target.cxx2
13 files changed, 187 insertions, 136 deletions
diff --git a/build2/b.cxx b/build2/b.cxx
index 93c02b4..6424b59 100644
--- a/build2/b.cxx
+++ b/build2/b.cxx
@@ -1167,7 +1167,7 @@ main (int argc, char* argv[])
// use to the bootstrap files (other than src-root.build, which,
// BTW, doesn't need to exist if src_root == out_root).
//
- scope& rs (*create_root (*ctx, out_root, src_root)->second.scope);
+ scope& rs (*create_root (*ctx, out_root, src_root)->second.front ());
bool bstrapped (bootstrapped (rs));
@@ -1579,7 +1579,7 @@ main (int argc, char* argv[])
//
scope& s (
o.dir
- ? *sm.insert ((out_base / *o.dir).normalize ())->second.scope
+ ? *sm.insert_out ((out_base / *o.dir).normalize ())->second.front ()
: *rs.weak_scope ());
auto p (s.vars.insert (o.ovr));
@@ -1600,7 +1600,7 @@ main (int argc, char* argv[])
scope& s (
o.dir
- ? *sm.insert ((out_base / *o.dir).normalize ())->second.scope
+ ? *sm.insert_out ((out_base / *o.dir).normalize ())->second.front ()
: rs);
auto p (s.vars.insert (o.ovr));
@@ -1646,7 +1646,7 @@ main (int argc, char* argv[])
// building before we know how to for all the targets in this
// operation batch.
//
- const scope& bs (ctx->scopes.find (ts.out_base));
+ const scope& bs (ctx->scopes.find_out (ts.out_base));
// Find the target type and extract the extension.
//
diff --git a/libbuild2/algorithm.cxx b/libbuild2/algorithm.cxx
index 39df018..3f83ddd 100644
--- a/libbuild2/algorithm.cxx
+++ b/libbuild2/algorithm.cxx
@@ -1063,7 +1063,7 @@ namespace build2
//
const dir_path& d (parent && t.name.empty () ? t.dir.directory () : t.dir);
- const scope& bs (t.ctx.scopes.find (d));
+ const scope& bs (t.ctx.scopes.find_out (d));
const scope* rs (bs.root_scope ());
// If root scope is NULL, then this can mean that we are out of any
@@ -1142,7 +1142,7 @@ namespace build2
if (op_t != nullptr)
{
- op_s = &t.ctx.scopes.find (t.dir);
+ op_s = &t.ctx.scopes.find_out (t.dir); // Always out.
if (op_s->out_path () == t.dir && !op_s->operation_callbacks.empty ())
{
diff --git a/libbuild2/bash/rule.cxx b/libbuild2/bash/rule.cxx
index 8b47fb0..d378227 100644
--- a/libbuild2/bash/rule.cxx
+++ b/libbuild2/bash/rule.cxx
@@ -278,7 +278,7 @@ namespace build2
continue;
}
- if (const scope* rs = t.ctx.scopes.find (b->dir).root_scope ())
+ if (const scope* rs = b->base_scope ().root_scope ())
{
const dir_path& d (pp.sub (rs->src_path ())
? rs->src_path ()
diff --git a/libbuild2/cc/compile-rule.cxx b/libbuild2/cc/compile-rule.cxx
index 9ae76a9..cb11728 100644
--- a/libbuild2/cc/compile-rule.cxx
+++ b/libbuild2/cc/compile-rule.cxx
@@ -2839,13 +2839,22 @@ namespace build2
//
small_vector<const target_type*, 2> tts;
- const scope& bs (t.ctx.scopes.find (d));
- if (const scope* rs = bs.root_scope ())
+ // Note that the path can be in out or src directory and the latter
+ // can be associated with multiple scopes. So strictly speaking we
+ // need to pick one that is "associated" with us. But that is still a
+ // TODO (see scope_map::find() for details) and so for now we just
+ // pick the first one (it's highly unlikely the source file extension
+ // mapping will differ based on the configuration).
+ //
{
- tts = map_extension (bs, n, e);
+ const scope& bs (**t.ctx.scopes.find (d).first);
+ if (const scope* rs = bs.root_scope ())
+ {
+ tts = map_extension (bs, n, e);
- if (!bs.out_eq_src () && d.sub (bs.src_path ()))
- out = out_src (d, *rs);
+ if (!bs.out_eq_src () && d.sub (bs.src_path ()))
+ out = out_src (d, *rs);
+ }
}
// If it is outside any project, or the project doesn't have such an
@@ -3504,12 +3513,13 @@ namespace build2
// See if this path is inside a project with an out-of-
// tree build and is in the out directory tree.
//
- const scope& bs (ctx.scopes.find (d));
+ const scope& bs (ctx.scopes.find_out (d));
if (bs.root_scope () != nullptr)
{
- const dir_path& bp (bs.out_path ());
- if (bp != bs.src_path ())
+ if (!bs.out_eq_src ())
{
+ const dir_path& bp (bs.out_path ());
+
bool e;
if ((e = (d == bp)) || d.sub (bp))
{
@@ -5977,7 +5987,7 @@ namespace build2
module_build_modules_dir /=
x);
- const scope* ps (&ctx.scopes.find (pd));
+ const scope* ps (&ctx.scopes.find_out (pd));
if (ps->out_path () != pd)
{
@@ -5988,7 +5998,7 @@ namespace build2
// Re-test again now that we are in exclusive phase (another thread
// could have already created and loaded the subproject).
//
- ps = &ctx.scopes.find (pd);
+ ps = &ctx.scopes.find_out (pd);
if (ps->out_path () != pd)
{
diff --git a/libbuild2/config/operation.cxx b/libbuild2/config/operation.cxx
index 7490bc3..d30de4d 100644
--- a/libbuild2/config/operation.cxx
+++ b/libbuild2/config/operation.cxx
@@ -609,7 +609,7 @@ namespace build2
{
const dir_path& pd (p.second);
dir_path out_nroot (out_root / pd);
- const scope& nrs (ctx.scopes.find (out_nroot));
+ const scope& nrs (ctx.scopes.find_out (out_nroot));
// @@ Strictly speaking we need to check whether the config module
// was loaded for this subproject.
@@ -649,7 +649,7 @@ namespace build2
for (auto p: *ps)
{
dir_path out_nroot (out_root / p.second);
- const scope& nrs (ctx.scopes.find (out_nroot));
+ const scope& nrs (ctx.scopes.find_out (out_nroot));
assert (nrs.out_path () == out_nroot);
configure_forward (nrs, projects);
@@ -877,7 +877,7 @@ namespace build2
{
const dir_path& pd (p.second);
dir_path out_nroot (out_root / pd);
- const scope& nrs (ctx.scopes.find (out_nroot));
+ const scope& nrs (ctx.scopes.find_out (out_nroot));
assert (nrs.out_path () == out_nroot); // See disfigure_load().
r = disfigure_project (a, nrs, projects) || r;
@@ -985,7 +985,7 @@ namespace build2
for (auto p: *ps)
{
dir_path out_nroot (out_root / p.second);
- const scope& nrs (ctx.scopes.find (out_nroot));
+ const scope& nrs (ctx.scopes.find_out (out_nroot));
assert (nrs.out_path () == out_nroot);
r = disfigure_forward (nrs, projects) || r;
diff --git a/libbuild2/context.cxx b/libbuild2/context.cxx
index e8f671d..09ab15d 100644
--- a/libbuild2/context.cxx
+++ b/libbuild2/context.cxx
@@ -34,8 +34,8 @@ namespace build2
static inline scope&
create_global_scope (scope_map& m)
{
- auto i (m.insert (dir_path ()));
- scope& r (*i->second.scope);
+ auto i (m.insert_out (dir_path ()));
+ scope& r (*i->second.front ());
r.out_path_ = &i->first;
return r;
};
@@ -490,7 +490,7 @@ namespace build2
//
if (c == '!' || (dir && dir->absolute ()))
{
- scope& s (c == '!' ? gs : *sm.insert (*dir)->second.scope);
+ scope& s (c == '!' ? gs : *sm.insert_out (*dir)->second.front ());
auto p (s.vars.insert (*o));
assert (p.second); // Variable name is unique.
diff --git a/libbuild2/dist/operation.cxx b/libbuild2/dist/operation.cxx
index ac76a62..f04a809 100644
--- a/libbuild2/dist/operation.cxx
+++ b/libbuild2/dist/operation.cxx
@@ -309,7 +309,7 @@ namespace build2
{
const dir_path& pd (p.second);
dir_path out_nroot (out_root / pd);
- const scope& nrs (ctx.scopes.find (out_nroot));
+ const scope& nrs (ctx.scopes.find_out (out_nroot));
if (nrs.out_path () != out_nroot) // This subproject not loaded.
continue;
@@ -470,7 +470,7 @@ namespace build2
const dir_path& pd (p.second);
if (dl.sub (pd))
{
- srs = &ctx.scopes.find (out_root / pd);
+ srs = &ctx.scopes.find_out (out_root / pd);
if (auto* m = srs->find_module<module> (module::name))
cbs = &m->callbacks_;
@@ -1008,7 +1008,9 @@ namespace build2
if (rs.out_path () != out_base || rs.src_path () != src_base)
fail (l) << "dist meta-operation target must be project root directory";
- setup_base (rs.ctx.scopes.rw (rs).insert (out_base), out_base, src_base);
+ setup_base (rs.ctx.scopes.rw (rs).insert_out (out_base),
+ out_base,
+ src_base);
// Also initialize the dist.* variables (needed in dist_project()).
//
diff --git a/libbuild2/dump.cxx b/libbuild2/dump.cxx
index 7cd95dd..bc44b24 100644
--- a/libbuild2/dump.cxx
+++ b/libbuild2/dump.cxx
@@ -438,7 +438,7 @@ namespace build2
scope_map::const_iterator& i,
bool rel)
{
- const scope& p (*i->second.scope);
+ const scope& p (*i->second.front ());
const dir_path& d (i->first);
++i;
@@ -493,7 +493,9 @@ namespace build2
// scope).
//
for (auto e (p.ctx.scopes.end ());
- i != e && i->second.out && i->second.scope->parent_scope () == &p; )
+ (i != e &&
+ i->second.front () != nullptr &&
+ i->second.front ()->parent_scope () == &p); )
{
if (vb)
{
@@ -543,7 +545,7 @@ namespace build2
dump (const context& c, optional<action> a)
{
auto i (c.scopes.begin ());
- assert (i->second.scope == &c.global_scope);
+ assert (i->second.front () == &c.global_scope);
// We don't lock diag_stream here as dump() is supposed to be called from
// the main thread prior/after to any other threads being spawned.
@@ -559,7 +561,7 @@ namespace build2
{
const scope_map& m (s.ctx.scopes);
auto i (m.find_exact (s.out_path ()));
- assert (i != m.end () && i->second.scope == &s);
+ assert (i != m.end () && i->second.front () == &s);
string ind (cind);
ostream& os (*diag_stream);
diff --git a/libbuild2/file.cxx b/libbuild2/file.cxx
index 87e21a6..4f24dd9 100644
--- a/libbuild2/file.cxx
+++ b/libbuild2/file.cxx
@@ -398,8 +398,8 @@ namespace build2
const dir_path& out_root,
const dir_path& src_root)
{
- auto i (ctx.scopes.rw ().insert (out_root, true /* root */));
- scope& rs (*i->second.scope);
+ auto i (ctx.scopes.rw ().insert_out (out_root, true /* root */));
+ scope& rs (*i->second.front ());
// Set out_path. Note that src_path is set in setup_root() below.
//
@@ -460,7 +460,7 @@ namespace build2
{
if (*s.out_path_ != d)
{
- auto i (ctx.scopes.rw (s).insert (s, d));
+ auto i (ctx.scopes.rw (s).insert_src (s, d));
s.src_path_ = &i->first;
}
else
@@ -477,7 +477,7 @@ namespace build2
const dir_path& out_base,
const dir_path& src_base)
{
- scope& s (*i->second.scope);
+ scope& s (*i->second.front ());
context& ctx (s.ctx);
// Set src/out_base variables.
@@ -507,7 +507,7 @@ namespace build2
{
if (out_base != src_base)
{
- auto i (ctx.scopes.rw (s).insert (s, src_base));
+ auto i (ctx.scopes.rw (s).insert_src (s, src_base));
s.src_path_ = &i->first;
}
else
@@ -525,8 +525,8 @@ namespace build2
// First, enter the scope into the map and see if it is in any project. If
// it is not, then there is nothing else to do.
//
- auto i (root.ctx.scopes.rw (root).insert (out_base));
- scope& base (*i->second.scope);
+ auto i (root.ctx.scopes.rw (root).insert_out (out_base));
+ scope& base (*i->second.front ());
scope* rs (nullptr);
@@ -739,7 +739,7 @@ namespace build2
// in which case we will have src_root and maybe even the name.
//
const dir_path* src_root (nullptr);
- const scope& s (ctx.scopes.find (out_root));
+ const scope& s (ctx.scopes.find_out (out_root));
if (s.root_scope () == &s && s.out_path () == out_root)
{
@@ -1332,7 +1332,7 @@ namespace build2
// probably be tried first since that src_root was explicitly configured
// by the user. After that, #2 followed by #1 seems reasonable.
//
- scope& rs (*create_root (ctx, out_root, dir_path ())->second.scope);
+ scope& rs (*create_root (ctx, out_root, dir_path ())->second.front ());
bool bstrapped (bootstrapped (rs));
@@ -1399,7 +1399,7 @@ namespace build2
// The same logic to src_root as in create_bootstrap_outer().
//
- scope& rs (*create_root (ctx, out_root, dir_path ())->second.scope);
+ scope& rs (*create_root (ctx, out_root, dir_path ())->second.front ());
optional<bool> altn;
if (!bootstrapped (rs))
@@ -1634,7 +1634,7 @@ namespace build2
assert (!forwarded || out_root != src_root);
auto i (create_root (ctx, out_root, src_root));
- scope& rs (*i->second.scope);
+ scope& rs (*i->second.front ());
if (!bootstrapped (rs))
{
@@ -2343,7 +2343,7 @@ namespace build2
{
bool top (proot == nullptr);
- root = create_root (ctx, out_root, src_root)->second.scope;
+ root = create_root (ctx, out_root, src_root)->second.front ();
bool bstrapped (bootstrapped (*root));
@@ -2532,7 +2532,7 @@ namespace build2
//
dir_path out_base (out_src (src_base, *root));
- auto i (ctx.scopes.rw (*root).insert (out_base));
+ auto i (ctx.scopes.rw (*root).insert_out (out_base));
scope& base (setup_base (i, move (out_base), move (src_base)));
source_once (*root, base, *bf);
diff --git a/libbuild2/operation.cxx b/libbuild2/operation.cxx
index 12aba0c..826cfff 100644
--- a/libbuild2/operation.cxx
+++ b/libbuild2/operation.cxx
@@ -81,7 +81,7 @@ namespace build2
// Create the base scope. Note that its existence doesn't mean it was
// already setup as a base scope; it can be the same as root.
//
- auto i (root.ctx.scopes.rw (root).insert (out_base));
+ auto i (root.ctx.scopes.rw (root).insert_out (out_base));
scope& base (setup_base (i, out_base, src_base));
// Load the buildfile unless it is implied.
@@ -505,7 +505,9 @@ namespace build2
if (rs.out_path () != out_base || rs.src_path () != src_base)
fail (l) << "meta-operation info target must be project root directory";
- setup_base (rs.ctx.scopes.rw (rs).insert (out_base), out_base, src_base);
+ setup_base (rs.ctx.scopes.rw (rs).insert_out (out_base),
+ out_base,
+ src_base);
}
void
diff --git a/libbuild2/scope.cxx b/libbuild2/scope.cxx
index 29e0c55..c5eb17e 100644
--- a/libbuild2/scope.cxx
+++ b/libbuild2/scope.cxx
@@ -942,23 +942,20 @@ namespace build2
//
auto scope_map::
- insert (const dir_path& k, bool root) -> iterator
+ insert_out (const dir_path& k, bool root) -> iterator
{
- auto er (map_.emplace (k, true /* out */));
+ auto er (map_.emplace (k, scopes ()));
if (er.second)
+ er.first->second.push_back (nullptr);
+
+ if (er.first->second.front () == nullptr)
{
- er.first->second.scope = new scope (ctx, true /* global */);
- }
- else if (!er.first->second.out)
- {
- // This can potentially be triggered if we use the same directory as one
- // project's out and another's src.
- //
- fail << "directory " << k << " is used as both src and out scope";
+ er.first->second.front () = new scope (ctx, true /* global */);
+ er.second = true;
}
- scope& s (*er.first->second.scope);
+ scope& s (*er.first->second.front ());
// If this is a new scope, update the parent chain.
//
@@ -976,27 +973,28 @@ namespace build2
auto r (map_.find_sub (k));
for (++r.first; r.first != r.second; ++r.first)
{
- scope& c (*r.first->second.scope);
-
- // The first scope of which we are a parent is the least (shortest)
- // one which means there is no other scope between it and our
- // parent.
- //
- if (p == nullptr)
- p = c.parent_;
-
- if (root && c.root_ == p->root_) // No intermediate root.
- c.root_ = &s;
-
- if (p == c.parent_) // No intermediate parent.
- c.parent_ = &s;
+ if (scope* c = r.first->second.front ())
+ {
+ // The first scope of which we are a parent is the least
+ // (shortest) one which means there is no other scope between it
+ // and our parent.
+ //
+ if (p == nullptr)
+ p = c->parent_;
+
+ if (root && c->root_ == p->root_) // No intermediate root.
+ c->root_ = &s;
+
+ if (p == c->parent_) // No intermediate parent.
+ c->parent_ = &s;
+ }
}
// We couldn't get the parent from one of its old children so we have
// to find it ourselves.
//
if (p == nullptr)
- p = &find (k.directory ());
+ p = &find_out (k.directory ());
}
s.parent_ = p;
@@ -1009,10 +1007,11 @@ namespace build2
auto r (map_.find_sub (k));
for (++r.first; r.first != r.second; ++r.first)
{
- scope& c (*r.first->second.scope);
-
- if (c.root_ == s.root_) // No intermediate root.
- c.root_ = &s;
+ if (scope* c = r.first->second.front ())
+ {
+ if (c->root_ == s.root_) // No intermediate root.
+ c->root_ = &s;
+ }
}
s.root_ = &s;
@@ -1022,35 +1021,56 @@ namespace build2
}
auto scope_map::
- insert (scope& s, const dir_path& k) -> iterator
+ insert_src (scope& s, const dir_path& k) -> iterator
{
- auto er (map_.emplace (k, false /* out */));
+ auto er (map_.emplace (k, scopes ()));
if (er.second)
- {
- er.first->second.scope = &s;
- }
- else if (!er.first->second.out)
- {
- assert (er.first->second.scope == &s);
- }
- else
- {
- // This can be triggered, for example, by specifying a variable override
- // with src instead of out directory.
- //
- fail << "directory " << k << " is used as both src and out scope";
- }
+ er.first->second.push_back (nullptr); // Owning out path entry.
+
+ // It doesn't feel like this function can possibly be called multiple
+ // times for the same scope and path so we skip the duplicate check.
+ //
+ er.first->second.push_back (&s);
return er.first;
}
scope& scope_map::
- find (const dir_path& k)
+ find_out (const dir_path& k)
{
assert (k.normalized (false)); // Allow non-canonical dir separators.
+
+ // This one is tricky: if we found an entry that doesn't contain the
+ // out path scope, then we need to consider outer scopes.
+ //
+ auto i (map_.find_sup_if (k,
+ [] (const pair<const dir_path, scopes>& v)
+ {
+ return v.second.front () != nullptr;
+ }));
+
+ assert (i != map_.end ()); // Should have at least global scope.
+ return *i->second.front ();
+ }
+
+ auto scope_map::
+ find (const dir_path& k) const -> pair<scopes::const_iterator,
+ scopes::const_iterator>
+ {
+ assert (k.normalized (false));
auto i (map_.find_sup (k));
- assert (i != map_.end ()); // Should have global scope.
- return *i->second.scope;
+ assert (i != map_.end ());
+
+ auto b (i->second.begin ());
+ auto e (i->second.end ());
+
+ // Skip NULL first element.
+ //
+ if (*b == nullptr)
+ ++b;
+
+ assert (b != e);
+ return make_pair (b, e);
}
}
diff --git a/libbuild2/scope.hxx b/libbuild2/scope.hxx
index 11fdfe4..b8ee15a 100644
--- a/libbuild2/scope.hxx
+++ b/libbuild2/scope.hxx
@@ -634,32 +634,27 @@ namespace build2
// While it contains both out and src paths, the latter is not available
// during bootstrap (see setup_root() and setup_base() for details).
//
+ // Note also that the same src path can be naturally associated with
+ // multiple out paths/scopes (and one of them may be the same as src).
+ //
class scope_map
{
public:
- struct scope_ptr
+ // The first element, if not NULL, is for the "owning" out path. The rest
+ // of the elements are for the src path shallow references.
+ //
+ struct scopes: small_vector<scope*, 3>
{
- using scope_type = build2::scope;
-
- scope_type* scope;
- bool out;
-
- scope_ptr (bool o): scope (nullptr), out (o) {}
- ~scope_ptr () {if (out) delete scope;}
-
- scope_ptr (scope_ptr&& x) // For GCC 4.9
- : scope (x.scope), out (x.out)
- {
- x.scope = nullptr;
- }
-
- scope_ptr& operator= (scope_ptr&&) = delete;
+ scopes () = default;
+ ~scopes () {if (!empty ()) delete front ();}
- scope_ptr (const scope_ptr&) = delete;
- scope_ptr& operator= (const scope_ptr&) = delete;
+ scopes (scopes&&) = default; // For GCC 4.9
+ scopes (const scopes&) = delete;
+ scopes& operator= (scopes&&) = delete;
+ scopes& operator= (const scopes&) = delete;
};
- using map_type = dir_path_map<scope_ptr>;
+ using map_type = dir_path_map<scopes>;
using iterator = map_type::iterator;
using const_iterator = map_type::const_iterator;
@@ -670,36 +665,56 @@ namespace build2
// global scope with empty key.
//
LIBBUILD2_SYMEXPORT iterator
- insert (const dir_path& our_path, bool root = false);
+ insert_out (const dir_path& our_path, bool root = false);
// Insert a shallow reference to the scope for its src path.
//
LIBBUILD2_SYMEXPORT iterator
- insert (scope&, const dir_path& src_path);
+ insert_src (scope&, const dir_path& src_path);
- // Find the most qualified scope that encompasses this path.
+ // Find the most qualified scope that encompasses this out path.
//
const scope&
- find (const dir_path& d) const
+ find_out (const dir_path& d) const
{
- return const_cast<scope_map*> (this)->find (d);
+ return const_cast<scope_map*> (this)->find_out (d);
}
- const scope&
- find (const path& p) const
- {
- // Natural thing to do here would be to call find (p.directory ()).
- // However, there could be a situation where the passed path is a
- // directory (i.e., the calling code does not know what it is dealing
- // with), so let's use the whole path.
- //
- // In fact, ideally, we should have used path_map instead of
- // dir_path_map to be able to search for both paths without any casting
- // (and copies). But currently we have too much stuff pointing to the
- // key.
- //
- return find (path_cast<dir_path> (p));
- }
+ // Find all the scopes that encompass this path (out or src).
+ //
+ // Note that the returned range will never be empty (there is always the
+ // global scope).
+ //
+ // If the path is in src, then we may end up with multiple scopes. For
+ // example, if two configurations of the same project are being built in a
+ // single invocation. How can we pick the scope that is "ours", for some
+ // definition of "ours"?
+ //
+ // The current think is that a project can be "associated" with other
+ // projects: its sub-projects and imported projects (it doesn't feel like
+ // its super-projects should be in this set, but maybe). And "ours" could
+ // mean belonging to one of the associated projects. This feels correct
+ // since a project shouldn't really be reaching into unrelated projects.
+ // And a project can only import one instance of any given project.
+ //
+ // We could implement this by keeping track (in scope::root_extra) of all
+ // the imported projects. The potential problem is performance: we would
+ // need to traverse the imported projects set recursively (potentially
+ // re-traversing the same projects multiple times).
+ //
+ // An alternative idea is to tag associated scopes with some marker so
+ // that all the scopes that "know" about each other have the same tag,
+ // essentially partitioning the scope set into connected subsets. One
+ // issue here (other than the complexity of implementing something like
+ // this) is that there could potentially be multiple source scopes with
+ // the same tag (e.g., two projects that don't know anything about each
+ // other could each import a different configuration of some common
+ // project and in turn be both imported by yet another project thus all
+ // acquiring the same tag). BTW, this could also be related to that
+ // "island append" restriction we have on loading additional buildfile.
+ //
+ LIBBUILD2_SYMEXPORT pair<scopes::const_iterator, scopes::const_iterator>
+ find (const dir_path&) const;
const_iterator begin () const {return map_.begin ();}
const_iterator end () const {return map_.end ();}
@@ -725,7 +740,7 @@ namespace build2
scope_map (context& c): ctx (c) {}
LIBBUILD2_SYMEXPORT scope&
- find (const dir_path&);
+ find_out (const dir_path&);
private:
context& ctx;
diff --git a/libbuild2/target.cxx b/libbuild2/target.cxx
index 6647f75..2ac5f9a 100644
--- a/libbuild2/target.cxx
+++ b/libbuild2/target.cxx
@@ -132,7 +132,7 @@ namespace build2
// If this target is from the src tree, use its out directory to find
// the scope.
//
- return ctx.scopes.find (out_dir ());
+ return ctx.scopes.find_out (out_dir ());
}
const scope& target::