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-rw-r--r--libbuild2/parser.cxx42
-rw-r--r--libbuild2/parser.hxx9
2 files changed, 51 insertions, 0 deletions
diff --git a/libbuild2/parser.cxx b/libbuild2/parser.cxx
index cc8fd9e..84b6366 100644
--- a/libbuild2/parser.cxx
+++ b/libbuild2/parser.cxx
@@ -247,6 +247,8 @@ namespace build2
{
pre_parse_ = false;
attributes_.clear ();
+ imported_ = false;
+ condition_ = nullopt;
default_target_ = nullptr;
peeked_ = false;
replay_ = replay::stop;
@@ -2368,6 +2370,34 @@ namespace build2
//
tracer trace ("parser::parse_dependency", &path_);
+ // Diagnose conditional prerequisites. Note that we want to diagnose this
+ // even if pns is empty (think empty variable expansion; the literal "no
+ // prerequisites" case is handled elsewhere). We also want to omit this
+ // check for imported buildfiles (export stub can reasonably wrap loading
+ // of a buildfile in a condition).
+ //
+ // @@ TMP For now we only do it during the dist meta-operation. In the
+ // future we should tighten this to any meta-operation provided
+ // the dist module is loaded.
+ //
+ // @@ TMP For now it's a warning because we have dependencies like
+ // cli.cxx{foo}: cli{foo} which are not currently possible to
+ // rewrite (cli.cxx{} is not always registered).
+ //
+ if (condition_ &&
+ !imported_ &&
+ ctx->current_mif != nullptr &&
+ ctx->current_mif->id == dist_id)
+ {
+ warn (tloc) << "conditional dependency declaration may result in "
+ << "incomplete distribution" <<
+ info (ploc) << "prerequisite declared here" <<
+ info (*condition_) << "conditional buildfile fragment starts here" <<
+ info << "instead use `include` prerequisite-specific variable to "
+ << "conditionally include prerequisites" <<
+ info << "for example: <target>: <prerequisite>: include = (<condition>)";
+ }
+
// First enter all the targets.
//
small_vector<reference_wrapper<target>, 1> tgs (
@@ -3699,6 +3729,12 @@ namespace build2
void parser::
parse_if_else (token& t, type& tt)
{
+ auto g = make_guard ([this, old = condition_] () mutable
+ {
+ condition_ = old;
+ });
+ condition_ = get_location (t);
+
parse_if_else (t, tt,
false /* multi */,
[this] (token& t, type& tt, bool s, const string& k)
@@ -3840,6 +3876,12 @@ namespace build2
void parser::
parse_switch (token& t, type& tt)
{
+ auto g = make_guard ([this, old = condition_] () mutable
+ {
+ condition_ = old;
+ });
+ condition_ = get_location (t);
+
parse_switch (t, tt,
false /* multi */,
[this] (token& t, type& tt, bool s, const string& k)
diff --git a/libbuild2/parser.hxx b/libbuild2/parser.hxx
index f806568..61ecd5b 100644
--- a/libbuild2/parser.hxx
+++ b/libbuild2/parser.hxx
@@ -91,6 +91,12 @@ namespace build2
parse_export_stub (istream& is, const path_name& name,
scope& rs, scope& bs)
{
+ auto g = make_guard ([this, old = imported_] () mutable
+ {
+ imported_ = old;
+ });
+ imported_ = true;
+
parse_buildfile (is, name, &rs, bs);
return move (export_value);
}
@@ -906,6 +912,9 @@ namespace build2
small_vector<attributes, 2> attributes_;
+ bool imported_ = false; // True if loaded via export stub.
+ optional<location> condition_; // Innermost if/switch (but not in recipe).
+
target* default_target_ = nullptr;
replay_token peek_;