SERVER-26276 Enable thin static linking on binutils platforms

1 files changed, 83 insertions, 0 deletions

diff --git a/site_scons/site_tools/thin_archive.py b/site_scons/site_tools/thin_archive.py
new file mode 100644
index 00000000000..05ff702142b
--- /dev/null
+++ b/site_scons/site_tools/thin_archive.py
@@ -0,0 +1,83 @@
+# Copyright 2016 MongoDB Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import SCons
+
+import re
+import subprocess
+
+def exists(env):
+    if not 'AR' in env:
+        return False
+
+    ar = env.subst(env['AR'])
+    if not ar:
+        return False
+
+    # If the user has done anything confusing with ARFLAGS, bail out. We want to find
+    # an item in ARFLAGS of the exact form 'rc'.
+    if not "rc" in env['ARFLAGS']:
+        return False
+
+    pipe = SCons.Action._subproc(env, SCons.Util.CLVar(ar) + ['--version'],
+                                 stdin = 'devnull',
+                                 stderr = 'devnull',
+                                 stdout = subprocess.PIPE)
+    if pipe.wait() != 0:
+        return False
+
+    isgnu = False
+    for line in pipe.stdout:
+        if isgnu:
+            continue  # consume all data
+        isgnu = re.search(r'^GNU ar', line)
+
+    return bool(isgnu)
+
+
+def generate(env):
+    if not exists(env):
+        return
+
+    class ThinArchiveNode(SCons.Node.FS.File):
+        def __init__(self, name, directory, fs):
+            SCons.Node.FS.File.__init__(self, name, directory, fs)
+
+        def get_contents(self):
+            child_sigs = sorted([child.get_csig() for child in self.children()])
+            return ''.join(child_sigs)
+
+        def get_content_hash(self):
+            return SCons.Util.MD5signature(self.get_contents())
+
+
+    def _ThinArchiveNode(env, name, directory = None, create = 1):
+        return env.fs._lookup(env.subst(name), directory, ThinArchiveNode, create)
+
+    env.AddMethod(_ThinArchiveNode, 'ThinArchiveNode')
+
+    def archive_target_factory(arg):
+        return env.ThinArchiveNode(arg)
+
+    env['BUILDERS']['Library'].target_factory = archive_target_factory
+    env['BUILDERS']['StaticLibrary'].target_factory = archive_target_factory
+
+    env['ARFLAGS'] = SCons.Util.CLVar([arflag if arflag != "rc" else "rcsTD" for arflag in env['ARFLAGS']])
+
+    def noop_action(env, target, source):
+        pass
+
+    # Disable running ranlib, since we added 's' above
+    env['RANLIBCOM'] = noop_action
+    env['RANLIBCOMSTR'] = 'Skipping ranlib for thin archive $TARGET'