build/target.txx


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// file      : build/target.txx -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
// license   : MIT; see accompanying LICENSE file

#include <build/scope>
#include <build/context>     // extension_pool
#include <build/diagnostics>
#include <build/prerequisite>

namespace build
{
  template <const char* ext>
  const std::string&
  target_extension_fix (const target_key&, scope&)
  {
    return extension_pool.find (ext);
  }

  template <const char* var>
  const std::string&
  target_extension_var (const target_key& tk, scope& s)
  {
    // Include target type/pattern-specific variables.
    //
    auto l (s.lookup (*tk.type, *tk.name, var));

    if (!l)
    {
      diag_record dr;
      dr << fail << "no default extension in variable '" << var << "'"
         << info << "required to derive file name for ";

      // This is a bit hacky: we may be dealing with a target (see
      // file::derive_path()) or prerequsite (see search_existing_file()).
      // So we are going to check if dir is absolute. If it is, then
      // we assume this is a target, otherwise -- prerequsite.
      //
      if (tk.dir->absolute ())
        dr << "target " << tk;
      else
      {
        const std::string* proj (nullptr); // Used for local prerequisites.
        dr << "prerequisite " << prerequisite_key {&proj, tk, &s};
      }
    }

    return extension_pool.find (as<std::string> (*l));
  }
}