Reimplement whole archive on Windows

Use wrapper script to get object files if /WHOLEARCHIVE is not supported.

fix https://github.com/bazelbuild/bazel/issues/1978
work towards https://github.com/bazelbuild/bazel/issues/1918

--
Change-Id: I675311478e65a1e1f3fa963187a5a8da531150d3
Reviewed-on: https://bazel-review.googlesource.com/#/c/6833
MOS_MIGRATED_REVID=137151817

2 files changed, 34 insertions, 0 deletions

diff --git a/tools/cpp/wrapper/bin/pydir/msvc_link.py b/tools/cpp/wrapper/bin/pydir/msvc_link.py
index b9aa81abb7..98c1a0b5e7 100644
--- a/tools/cpp/wrapper/bin/pydir/msvc_link.py
+++ b/tools/cpp/wrapper/bin/pydir/msvc_link.py
@@ -68,6 +68,9 @@ class MsvcLinker(msvc_tools.WindowsRunner):
     # Build argument list.
     parser = msvc_tools.ArgParser(self, argv, LINKPATTERNS)
 
+    # Preprocessing arguments for linking whole archive libraries
+    parser.WholeArchivePreprocess()
+
     # Find the output file name.
     name = ''
     for arg in parser.options:
diff --git a/tools/cpp/wrapper/bin/pydir/msvc_tools.py.tpl b/tools/cpp/wrapper/bin/pydir/msvc_tools.py.tpl
index 99b2e39c3e..813b07d6cf 100644
--- a/tools/cpp/wrapper/bin/pydir/msvc_tools.py.tpl
+++ b/tools/cpp/wrapper/bin/pydir/msvc_tools.py.tpl
@@ -31,6 +31,7 @@ TMP_PATH = '%{tmp}'
 PATH = "%{path}"
 INCLUDE = "%{include}"
 LIB = "%{lib}"
+LIB_TOOL = "%{lib_tool}"
 
 class Error(Exception):
   """Base class for all script-specific errors."""
@@ -52,8 +53,38 @@ class ArgParser(object):
     self.deps_file = None
     self.output_file = None
     self.params_file = None
+    self.support_whole_archive = %{support_whole_archive}
+    self.need_global_whole_archive = None
     self._ParseArgs(argv)
 
+  def ReplaceLibrary(self, arg):
+    """Do the actual replacement if necessary."""
+    if arg == "/WHOLEARCHIVE":
+      return []
+    if arg.startswith("/OUT:") or os.path.splitext(arg)[1] not in ['.a', '.lo']:
+      return [arg]
+    if self.global_whole_archive or arg.startswith("/WHOLEARCHIVE:"):
+      if arg.startswith("/WHOLEARCHIVE:"):
+        arg = arg[len("/WHOLEARCHIVE:"):]
+      output = subprocess.check_output([LIB_TOOL, "/list", arg]).decode("utf-8")
+      object_files = []
+      for line in output.split("\n"):
+        line = line.strip()
+        if line.endswith(".o"):
+          object_files.append(line)
+      return object_files
+    return [arg]
+
+  def WholeArchivePreprocess(self):
+    """Replace library file with object files if /WHOLEARCHIVE is not supported."""
+    if self.support_whole_archive:
+      return
+    options = []
+    self.global_whole_archive = "/WHOLEARCHIVE" in self.options
+    for arg in self.options:
+      options.extend(self.ReplaceLibrary(arg))
+    self.options = options
+
   def _MatchOneArg(self, args):
     """Finds a pattern which matches the beginning elements of args.