rose: only write out report programs if in use

These programs are only used by output-exposed engines.

src/smallwrite/smallwrite_build.cpp

@@ -74,6 +74,8 @@ public:
     void add(const NGWrapper &w) override;
     void add(const ue2_literal &literal, ReportID r) override;
 
+    set<ReportID> all_reports() const override;
+
     bool determiniseLiterals();
 
     const ReportManager &rm;
@@ -413,6 +415,20 @@ SmallWriteBuildImpl::build(u32 roseQuality) {
     return smwr;
 }
 
+set<ReportID> SmallWriteBuildImpl::all_reports() const {
+    set<ReportID> reports;
+    if (poisoned) {
+        return reports;
+    }
+    if (rdfa) {
+        insert(&reports, ::ue2::all_reports(*rdfa));
+    }
+    for (const auto &cand : cand_literals) {
+        reports.insert(cand.second);
+    }
+    return reports;
+}
+
 size_t smwrSize(const SmallWriteEngine *smwr) {
     assert(smwr);
     return smwr->size;

src/smallwrite/smallwrite_build.h

@@ -38,6 +38,8 @@
 #include "ue2common.h"
 #include "util/alloc.h"
 
+#include <set>
+
 #include <boost/core/noncopyable.hpp>
 
 struct SmallWriteEngine;
@@ -61,6 +63,8 @@ public:
 
     virtual void add(const NGWrapper &w) = 0;
     virtual void add(const ue2_literal &literal, ReportID r) = 0;
+
+    virtual std::set<ReportID> all_reports() const = 0;
 };
 
 // Construct a usable SmallWrite builder.