build: Updates to enable AIX support

These are the core changes that allow AIX to compile.  There
are still some test failures as there are some patches needed for
libuv and npm that we'll need to contribute through those
communities but this set allows node to be built on AIX and
pass most of the core tests

The change in js2c is because AIX does not support $ in
identifier names.  See the discussion/agreement in
#2272

PR-URL: #2364
Reviewed-By: Ben Noordhuis <ben@strongloop.com>
Reviewed-By: Rod Vagg <r@va.gg>

common.gypi

@@ -64,6 +64,10 @@
           ['target_arch=="x64"', {
             'msvs_configuration_platform': 'x64',
           }],
+          ['OS=="aix"', {
+            'cflags': [ '-gxcoff' ],
+            'ldflags': [ '-Wl,-bbigtoc' ],
+          }],
         ],
         'msvs_settings': {
           'VCCLCompilerTool': {
@@ -217,11 +221,11 @@
           'BUILDING_UV_SHARED=1',
         ],
       }],
-      [ 'OS in "linux freebsd openbsd solaris"', {
+      [ 'OS in "linux freebsd openbsd solaris aix"', {
         'cflags': [ '-pthread', ],
         'ldflags': [ '-pthread' ],
       }],
-      [ 'OS in "linux freebsd openbsd solaris android"', {
+      [ 'OS in "linux freebsd openbsd solaris android aix"', {
         'cflags': [ '-Wall', '-Wextra', '-Wno-unused-parameter', ],
         'cflags_cc': [ '-fno-rtti', '-fno-exceptions', '-std=gnu++0x' ],
         'ldflags': [ '-rdynamic' ],
@@ -243,11 +247,11 @@
             'cflags': [ '-m64' ],
             'ldflags': [ '-m64' ],
           }],
-          [ 'target_arch=="ppc"', {
+          [ 'target_arch=="ppc" and OS!="aix"', {
             'cflags': [ '-m32' ],
             'ldflags': [ '-m32' ],
           }],
-          [ 'target_arch=="ppc64"', {
+          [ 'target_arch=="ppc64" and OS!="aix"', {
 	    'cflags': [ '-m64', '-mminimal-toc' ],
 	    'ldflags': [ '-m64' ],
 	   }],
@@ -257,6 +261,18 @@
             'cflags!': [ '-pthread' ],
             'ldflags!': [ '-pthread' ],
           }],
+          [ 'OS=="aix"', {
+            'conditions': [
+              [ 'target_arch=="ppc"', {
+                'ldflags': [ '-Wl,-bmaxdata:0x60000000/dsa' ],
+              }],
+              [ 'target_arch=="ppc64"', {
+                'cflags': [ '-maix64' ],
+                'ldflags': [ '-maix64' ],
+              }],
+            ],
+            'ldflags!': [ '-rdynamic' ],
+          }],
         ],
       }],
       [ 'OS=="android"', {

configure

@@ -25,7 +25,8 @@ import nodedownload
 # parse our options
 parser = optparse.OptionParser()
 
-valid_os = ('win', 'mac', 'solaris', 'freebsd', 'openbsd', 'linux', 'android')
+valid_os = ('win', 'mac', 'solaris', 'freebsd', 'openbsd', 'linux',
+            'android', 'aix')
 valid_arch = ('arm', 'arm64', 'ia32', 'mips', 'mipsel', 'ppc', 'ppc64', 'x32',
               'x64', 'x86')
 valid_arm_float_abi = ('soft', 'softfp', 'hard')
@@ -492,11 +493,11 @@ def check_compiler(o):
     o['variables']['gas_version'] = get_gas_version(CC)
 
 
-def cc_macros():
-  """Checks predefined macros using the CC command."""
+def cc_macros(cc=None):
+  """Checks predefined macros using the C compiler command."""
 
   try:
-    p = subprocess.Popen(shlex.split(CC) + ['-dM', '-E', '-'],
+    p = subprocess.Popen(shlex.split(cc or CC) + ['-dM', '-E', '-'],
                          stdin=subprocess.PIPE,
                          stdout=subprocess.PIPE,
                          stderr=subprocess.PIPE)
@@ -554,7 +555,12 @@ def is_arm_hard_float_abi():
 def host_arch_cc():
   """Host architecture check using the CC command."""
 
-  k = cc_macros()
+  if sys.platform.startswith('aix'):
+    # we only support gcc at this point and the default on AIX
+    # would be xlc so hard code gcc
+    k = cc_macros('gcc')
+  else:
+    k = cc_macros()
 
   matchup = {
     '__aarch64__' : 'arm64',

deps/cares/cares.gyp

@@ -9,6 +9,10 @@
           '_GNU_SOURCE'
         ]
       }],
+      [ 'OS=="aix"', {
+        'include_dirs': [ 'config/aix' ],
+        'sources': [ 'config/aix/ares_config.h' ],
+      }],
       ['OS=="solaris"', {
         'defines': [
           '__EXTENSIONS__',

deps/cares/common.gypi

@@ -137,7 +137,7 @@
         ],
       }],
 
-      [ 'OS in "linux freebsd openbsd solaris android"', {
+      [ 'OS in "linux freebsd openbsd solaris android aix"', {
         'variables': {
           'gcc_version%': '<!(python build/gcc_version.py)>)'
         },