Special-case paths that appear in libs by not prefixing them with -l.

tools/gn/config_values.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef TOOLS_GN_CONFIG_VALUES_H_
 #define TOOLS_GN_CONFIG_VALUES_H_
 
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
+#include "tools/gn/lib_file.h"
 #include "tools/gn/source_dir.h"
 #include "tools/gn/source_file.h"
 
 // Holds the values (include_dirs, defines, compiler flags, etc.) for a given
 // config or target.
 class ConfigValues {
  public:
   ConfigValues();
   ~ConfigValues();
 
@@ skipping 10 matching lines @@
   STRING_VALUES_ACCESSOR(asmflags)
   STRING_VALUES_ACCESSOR(cflags)
   STRING_VALUES_ACCESSOR(cflags_c)
   STRING_VALUES_ACCESSOR(cflags_cc)
   STRING_VALUES_ACCESSOR(cflags_objc)
   STRING_VALUES_ACCESSOR(cflags_objcc)
   STRING_VALUES_ACCESSOR(defines)
   DIR_VALUES_ACCESSOR   (include_dirs)
   STRING_VALUES_ACCESSOR(ldflags)
   DIR_VALUES_ACCESSOR   (lib_dirs)
-  STRING_VALUES_ACCESSOR(libs)
   // If you add a new one, be sure to update AppendValues().
 
 #undef STRING_VALUES_ACCESSOR
 #undef DIR_VALUES_ACCESSOR
 
+  const std::vector<LibFile>& libs() const { return libs_; }
+  std::vector<LibFile>& libs() { return libs_; }
+
   bool has_precompiled_headers() const {
     return !precompiled_header_.empty() || !precompiled_source_.is_null();
   }
   const std::string& precompiled_header() const {
     return precompiled_header_;
   }
   void set_precompiled_header(const std::string& f) {
     precompiled_header_ = f;
   }
   const SourceFile& precompiled_source() const {
     return precompiled_source_;
   }
   void set_precompiled_source(const SourceFile& f) {
     precompiled_source_ = f;
   }
 
  private:
   std::vector<std::string> asmflags_;
   std::vector<std::string> cflags_;
   std::vector<std::string> cflags_c_;
   std::vector<std::string> cflags_cc_;
   std::vector<std::string> cflags_objc_;
   std::vector<std::string> cflags_objcc_;
   std::vector<std::string> defines_;
   std::vector<SourceDir>   include_dirs_;
   std::vector<std::string> ldflags_;
   std::vector<SourceDir>   lib_dirs_;
-  std::vector<std::string> libs_;
+  std::vector<LibFile>     libs_;
   // If you add a new one, be sure to update AppendValues().
 
   std::string precompiled_header_;
   SourceFile precompiled_source_;
 };
 
 #endif  // TOOLS_GN_CONFIG_VALUES_H_