SERVER-9564 Expose linking model choice as a build option

1 files changed, 52 insertions, 5 deletions

diff --git a/site_scons/libdeps.py b/site_scons/libdeps.py
index 971bd0d004b..4c8dbf1b24f 100644
--- a/site_scons/libdeps.py
+++ b/site_scons/libdeps.py
@@ -247,7 +247,48 @@ def libdeps_emitter(target, source, env):
 
     return target, source
 
-def setup_environment(env):
+def shlibdeps_emitter(target, source, env):
+    """SCons emitter that takes values from the LIBDEPS environment variable and
+    converts them to File node objects, binding correct path information into
+    those File objects.
+
+    Emitters run on a particular "target" node during the initial execution of
+    the SConscript file, rather than during the later build phase.  When they
+    run, the "env" environment's working directory information is what you
+    expect it to be -- that is, the working directory is considered to be the
+    one that contains the SConscript file.  This allows specification of
+    relative paths to LIBDEPS elements.
+
+    This emitter also adds LIBSUFFIX and LIBPREFIX appropriately.
+
+    NOTE: For purposes of LIBDEPS_DEPENDENTS propagation, only the first member
+    of the "target" list is made a prerequisite of the elements of LIBDEPS_DEPENDENTS.
+    """
+
+    libdep_files = []
+    lib_suffix = env.subst('$SHLIBSUFFIX', target=target, source=source)
+    lib_prefix = env.subst('$SHLIBPREFIX', target=target, source=source)
+    for prereq in env.Flatten([env.get(libdeps_env_var, [])]):
+        full_path = env.subst(str(prereq), target=target, source=source)
+        dir_name = os.path.dirname(full_path)
+        file_name = os.path.basename(full_path)
+        if not file_name.startswith(lib_prefix):
+            file_name = '${SHLIBPREFIX}' + file_name
+        if not file_name.endswith(lib_suffix):
+            file_name += '${SHLIBSUFFIX}'
+        libdep_files.append(env.File(os.path.join(dir_name, file_name)))
+
+    for t in target:
+        # target[0] must be a Node and not a string, or else libdeps will fail to
+        # work properly.
+        __append_direct_libdeps(t, libdep_files)
+
+    for dependent in env.Flatten([env.get('LIBDEPS_DEPENDENTS', [])]):
+        __append_direct_libdeps(env.File(dependent), [target[0]])
+
+    return target, source
+
+def setup_environment(env, emitting_shared=False):
     """Set up the given build environment to do LIBDEPS tracking."""
 
     try:
@@ -269,10 +310,16 @@ def setup_environment(env):
 
     env[libdeps_env_var] = SCons.Util.CLVar()
     env[syslibdeps_env_var] = SCons.Util.CLVar()
-    env.Append(LIBEMITTER=libdeps_emitter,
-               PROGEMITTER=libdeps_emitter,
-               SHLIBEMITTER=libdeps_emitter)
-    env.Prepend(_LIBFLAGS=' $LINK_LIBGROUP_START $_LIBDEPS $LINK_LIBGROUP_END $_SYSLIBDEPS ')
+    env.Append(LIBEMITTER=libdeps_emitter)
+    if emitting_shared:
+        env.Append(
+            PROGEMITTER=shlibdeps_emitter,
+            SHLIBEMITTER=shlibdeps_emitter)
+    else:
+        env.Append(
+            PROGEMITTER=libdeps_emitter,
+            SHLIBEMITTER=libdeps_emitter)
+    env.Prepend(_LIBFLAGS=' $LINK_WHOLE_ARCHIVE_START $LINK_LIBGROUP_START $_LIBDEPS $LINK_LIBGROUP_END $LINK_WHOLE_ARCHIVE_END $_SYSLIBDEPS ')
     for builder_name in ('Program', 'SharedLibrary', 'LoadableModule'):
         try:
             update_scanner(env['BUILDERS'][builder_name])