make: don't use --whole-archive for loadable_module

pylib/gyp/generator/make.py

 #!/usr/bin/python
 
 # Copyright (c) 2011 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Notes:
 #
 # This is all roughly based on the Makefile system used by the Linux
 # kernel, but is a non-recursive make -- we put the entire dependency
@@ skipping 189 matching lines @@
 quiet_cmd_copy = COPY $@
 # send stderr to /dev/null to ignore messages when linking directories.
 cmd_copy = ln -f $< $@ 2>/dev/null || cp -af $< $@
 
 # Due to circular dependencies between libraries :(, we wrap the
 # special "figure out circular dependencies" flags around the entire
 # input list during linking.
 quiet_cmd_link = LINK($(TOOLSET)) $@
 cmd_link = $(LINK.$(TOOLSET)) $(GYP_LDFLAGS) $(LDFLAGS.$(TOOLSET)) -o $@ -Wl,--start-group $(filter-out FORCE_DO_CMD, $^) -Wl,--end-group $(LIBS)
 
-# Shared-object link (for generating .so).
+# We support two kinds of shared objects (.so):
+# 1) shared_library, which is just bundling together many dependent libraries
+# into a link line.
+# 2) loadable_module, which is generating a module intended for dlopen().
+#
+# They differ only slightly:
+# In the former case, we want to package all dependent code into the .so.
+# In the latter case, we want to package just the API exposed by the
+# outermost module.
+# This means shared_library uses --whole-archive, while loadable_module doesn't.
+# (Note that --whole-archive is incompatible with the --start-group used in
+# normal linking.)
+
+# Other shared-object link notes:
 # - Set SONAME to the library filename so our binaries don't reference
 # the local, absolute paths used on the link command-line.
-# - Use --whole-archive so that the .a files we combine end up in the public
-# API of the shared object.  (Note that --whole-archive is incompatible with
-# the --start-group used in normal linking.)
 quiet_cmd_solink = SOLINK($(TOOLSET)) $@
 cmd_solink = $(LINK.$(TOOLSET)) -shared $(GYP_LDFLAGS) $(LDFLAGS.$(TOOLSET)) -Wl,-soname=$(@F) -o $@ -Wl,--whole-archive $(filter-out FORCE_DO_CMD, $^) -Wl,--no-whole-archive $(LIBS)
+
+quiet_cmd_solink_module = SOLINK_MODULE($(TOOLSET)) $@
+cmd_solink_module = $(LINK.$(TOOLSET)) -shared $(GYP_LDFLAGS) $(LDFLAGS.$(TOOLSET)) -Wl,-soname=$(@F) -o $@ -Wl,--start-group $(filter-out FORCE_DO_CMD, $^) -Wl,--end-group $(LIBS)
 """
+
 r"""
 # Define an escape_quotes function to escape single quotes.
 # This allows us to handle quotes properly as long as we always use
 # use single quotes and escape_quotes.
 escape_quotes = $(subst ','\'',$(1))
 # This comment is here just to include a ' to unconfuse syntax highlighting.
 # Define an escape_vars function to escape '$' variable syntax.
 # This allows us to read/write command lines with shell variables (e.g.
 # $LD_LIBRARY_PATH), without triggering make substitution.
 escape_vars = $(subst $$,$$$$,$(1))
@@ skipping 778 matching lines @@
         # Remove duplicate entries
         libraries = gyp.common.uniquer(libraries)
       self.WriteList(libraries, 'LIBS')
       self.WriteLn('%s: GYP_LDFLAGS := $(LDFLAGS_$(BUILDTYPE))' % self.output)
       self.WriteLn('%s: LIBS := $(LIBS)' % self.output)
 
     if self.type == 'executable':
       self.WriteDoCmd([self.output], link_deps, 'link', part_of_all)
     elif self.type == 'static_library':
       self.WriteDoCmd([self.output], link_deps, 'alink', part_of_all)
-    elif self.type in ('loadable_module', 'shared_library'):
+    elif self.type == 'shared_library':
       self.WriteDoCmd([self.output], link_deps, 'solink', part_of_all)
+    elif self.type == 'loadable_module':
+      self.WriteDoCmd([self.output], link_deps, 'solink_module', part_of_all)
     elif self.type == 'none':
       # Write a stamp line.
       self.WriteDoCmd([self.output], deps, 'touch', part_of_all)
     elif self.type == 'settings':
       # Only used for passing flags around.
       pass
     else:
       print "WARNING: no output for", self.type, target
 
     # Add an alias for each target (if there are any outputs).
@@ skipping 488 matching lines @@
   # Add a check to make sure we tried to process all the .d files.
   all_deps += """
   ifneq ($(word %(last)d,$(d_files)),)
     $(error Found unprocessed dependency files (gyp didn't generate enough rules!))
   endif
 """ % { 'last': ((num_outputs / 1000) + 1) * 1000 + 1 }
 
   root_makefile.write(SHARED_FOOTER % { 'generate_all_deps': all_deps })
 
   root_makefile.close()