COFF: Add a new PE/COFF port.

This is an initial patch for a section-based COFF linker.

The patch has 2300 lines of code including comments and blank lines.
Before diving into details, you want to start from reading README
because it should give you an overview of the design.

All important things are written in the README file, so I write
summary here.

- The linker is already able to self-link on Windows.

- It's significantly faster than the existing implementation.
  The existing one takes 5 seconds to link LLD on my machine,
  while the new one only takes 1.2 seconds, even though the new
  one is not multi-threaded yet. (And a proof-of-concept multi-
  threaded version was able to link it in 0.5 seconds.)

- It uses much less memory (250MB vs. 2GB virtual memory space
  to self-host).

- IMHO the new code is much simpler and easier to read than
  the existing PE/COFF port.

http://reviews.llvm.org/D10036

1 files changed, 1 insertions, 0 deletions

diff --git a/lld/unittests/DriverTests/CMakeLists.txt b/lld/unittests/DriverTests/CMakeLists.txt
index 59d56d45958..d9ff62cddd5 100644
--- a/lld/unittests/DriverTests/CMakeLists.txt
+++ b/lld/unittests/DriverTests/CMakeLists.txt
@@ -8,6 +8,7 @@ add_lld_unittest(DriverTests
 
 target_link_libraries(DriverTests
   lldDriver
+  lldCOFF
   lldCore
   lldPECOFF
   lldMachO