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| -rw-r--r-- | build2/parser.cxx | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/build2/parser.cxx b/build2/parser.cxx index 2a20aba..7dd6a26 100644 --- a/build2/parser.cxx +++ b/build2/parser.cxx @@ -787,6 +787,17 @@ namespace build2 // if (tt == type::colon) { + // What should we do if there are no prerequisites (for example, + // because of an empty wildcard result)? We can fail or we can + // ignore. In most cases, however, this is probably an error + // (for example, forgetting to checkout a git submodule) so + // let's not confuse the user and fail (one can always handle + // the optional prerequisites case with a variable and an if). + // + if (pns.empty ()) + fail (ploc) << "no prerequisites in prerequisite-specific " + << " variable assignment"; + // Set the variable in the last pns.size() prerequisites of each // target. This code is similar to target-specific case above. // |