Add support for for_install prerequisite-specific var in link rule

Also reserve for_test.

2 files changed, 26 insertions, 0 deletions

diff --git a/build2/cc/link-rule.cxx b/build2/cc/link-rule.cxx
index bfc31d7..fa6d5e4 100644
--- a/build2/cc/link-rule.cxx
+++ b/build2/cc/link-rule.cxx
@@ -1299,6 +1299,7 @@ namespace build2
       }
 
       md.binless = binless;
+      md.start = start;
 
       switch (a)
       {
@@ -1801,6 +1802,30 @@ namespace build2
         ts = target_state::changed;
       }
 
+      // Check for the for_install variable on each prerequisite and blank out
+      // those that don't match. Note that we have to do it after updating
+      // prerequisites to keep the dependency counts straight.
+      //
+      if (const variable* var_fi = ctx.var_pool.find ("for_install"))
+      {
+        // Parallel prerequisites/prerequisite_targets loop.
+        //
+        size_t i (md.start);
+        for (prerequisite_member p: group_prerequisite_members (a, t))
+        {
+          const target*& pt (t.prerequisite_targets[a][i++]);
+
+          if (pt == nullptr)
+            continue;
+
+          if (lookup l = p.prerequisite.vars[var_fi])
+          {
+            if (cast<bool> (l) != for_install)
+              pt = nullptr;
+          }
+        }
+      }
+
       // (Re)generate pkg-config's .pc file. While the target itself might be
       // up-to-date from a previous run, there is no guarantee that .pc exists
       // or also up-to-date. So to keep things simple we just regenerate it
diff --git a/build2/cc/link-rule.hxx b/build2/cc/link-rule.hxx
index c572ab3..da6181b 100644
--- a/build2/cc/link-rule.hxx
+++ b/build2/cc/link-rule.hxx
@@ -116,6 +116,7 @@ namespace build2
         optional<bool> for_install;
 
         bool binless; // Binary-less library.
+        size_t start; // Parallel prerequisites/prerequisite_targets start.
 
         link_rule::libs_paths libs_paths;
       };