build: Updates for AIX npm support - part 1

configure

@@ -657,6 +657,10 @@ def configure_node(o):
   elif target_arch in ('mips', 'mipsel'):
     configure_mips(o)
 
+  if flavor == 'aix':
+    o['variables']['node_core_target_name'] = 'node_base'
+    o['variables']['node_target_type'] = 'static_library'
+
   if flavor in ('solaris', 'mac', 'linux', 'freebsd'):
     use_dtrace = not options.without_dtrace
     # Don't enable by default on linux and freebsd

node.gyp

@@ -13,6 +13,7 @@
     'node_shared_openssl%': 'false',
     'node_v8_options%': '',
     'node_target_type%': 'executable',
+    'node_core_target_name%': 'node',
     'library_files': [
       'src/node.js',
       'lib/_debug_agent.js',
@@ -79,7 +80,7 @@
 
   'targets': [
     {
-      'target_name': 'node',
+      'target_name': '<(node_core_target_name)',
       'type': '<(node_target_type)',
 
       'dependencies': [
@@ -666,5 +667,53 @@
         'test/cctest/util.cc',
       ],
     }
-  ] # end targets
+  ], # end targets
+
+  'conditions': [
+    ['OS=="aix"', {
+      'targets': [
+        {
+          'target_name': 'node',
+          'type': 'executable',
+          'dependencies': ['<(node_core_target_name)', 'node_exp'],
+
+          'include_dirs': [
+            'src',
+            'deps/v8/include',
+          ],
+
+          'sources': [
+            'src/node_main.cc',
+            '<@(library_files)',
+            # node.gyp is added to the project by default.
+            'common.gypi',
+          ],
+
+          'ldflags': ['-Wl,-bbigtoc,-bE:<(PRODUCT_DIR)/node.exp'],
+        },
+        {
+          'target_name': 'node_exp',
+          'type': 'none',
+          'dependencies': [
+            '<(node_core_target_name)',
+          ],
+          'actions': [
+            {
+              'action_name': 'expfile',
+              'inputs': [
+                '<(OBJ_DIR)'
+              ],
+              'outputs': [
+                '<(PRODUCT_DIR)/node.exp'
+              ],
+              'action': [
+                'sh', 'tools/create_expfile.sh',
+                      '<@(_inputs)', '<@(_outputs)'
+              ],
+            }
+          ]
+        }
+      ], # end targets
+    }], # end aix section
+  ], # end conditions block
 }

tools/create_expfile.sh

@@ -0,0 +1,48 @@
+#!/bin/sh
+# This script writes out all the exported symbols to a file
+# AIX needs this as sybmols are not exported by an
+# executable by default and we need to list
+# them specifically in order to export them
+# so that they can be used by native add-ons
+#
+# The raw symbol data is objtained by using nm on
+# the .a files which make up the node executable
+#
+# -Xany makes sure we get symbols on both
+# 32 bit and 64 bit as by default we'd only get those
+# for 32 bit
+#
+# -g selects only exported symbols
+#
+# -C, -B and -p ensure the output is in a format we
+# can easily parse and convert into the symbol we need
+#
+# -C suppresses the demangling of C++ names
+# -B gives us output in BSD format
+# -p displays the info in a standard portable output format
+#
+# We only include symbols if they are of the
+# following types and don't start with a dot.
+#
+# T - Global text symbol
+# D - Global data symbol
+# B - Gobal bss symbol.
+#
+# the final sort allows us to remove any duplicates
+#
+# We need to exclude gtest libraries as they are not
+# linked into the node executable
+#
+echo "Searching $1 to write out expfile to $2"
+
+# this special sequence must be at the start of the exp file
+echo "#!." > $2
+
+# pull the symbols from the .a files
+find $1 -name "*.a" | grep -v gtest \
+  | xargs nm -Xany -BCpg \
+  | awk '{
+      if ((($2 == "T") || ($2 == "D") || ($2 == "B")) &&
+          (substr($3,1,1) != ".")) { print $3 }
+    }' \
+  | sort -u >> $2

tools/install.py

@@ -160,6 +160,10 @@ def headers(action):
     'src/node_version.h',
   ], 'include/node/')
 
+  # Add the expfile that is created on AIX
+  if sys.platform.startswith('aix'):
+    action(['out/Release/node.exp'], 'include/node/')
+
   subdir_files('deps/cares/include', 'include/node/', action)
   subdir_files('deps/v8/include', 'include/node/', action)