Add dynamic prerequisites to $< unless --adhoc is specified

Also add a few tests for depdb-dyndep.

1 files changed, 14 insertions, 6 deletions

diff --git a/libbuild2/build/script/script.hxx b/libbuild2/build/script/script.hxx
index 4e88785..0619253 100644
--- a/libbuild2/build/script/script.hxx
+++ b/libbuild2/build/script/script.hxx
@@ -94,6 +94,17 @@ namespace build2
                      bool temp_dir,
                      const optional<timestamp>& deadline = nullopt);
 
+        // (Re)set special $< and $> variables.
+        //
+        void
+        set_special_variables (action);
+
+        // Create the temporary directory (if it doesn't exist yet) and set
+        // the $~ special variable to its path.
+        //
+        void
+        set_temp_dir_variable ();
+
         environment (environment&&) = delete;
         environment (const environment&) = delete;
         environment& operator= (environment&&) = delete;
@@ -117,6 +128,9 @@ namespace build2
         variable_pool var_pool;
         variable_map vars;
 
+        const variable& var_ts; // $>
+        const variable& var_ps; // $<
+
         // Temporary directory for the script run.
         //
         // Currently this directory is removed regardless of the script
@@ -146,12 +160,6 @@ namespace build2
         //
         size_t exec_line = 1;
 
-        // Create the temporary directory (if it doesn't exist yet) and set
-        // the $~ special variable to its path.
-        //
-        void
-        set_temp_dir_variable ();
-
         virtual void
         set_variable (string&& name,
                       names&&,