First draft of the sh4 port

SConstruct

Index: SConstruct
diff --git a/SConstruct b/SConstruct
index 5f8616a6b8531f44ca0cfaa59f224527ffb69b20..e39766d7e749fcfb68a1c8f427e8649a88d3d174 100644
--- a/SConstruct
+++ b/SConstruct
@@ -180,6 +180,10 @@ LIBRARY_FLAGS = {
       'CCFLAGS':      ['-m32'],
       'LINKFLAGS':    ['-m32'],
     },
+    'arch:sh4': {

[Jakob Kummerow, 2012/11/07 11:18:24]

Building V8 with SCons is deprecated (and already deactivated by means of a
flag). I'm planning to delete this file and its friends before the end of the
year. Please update the GYP based build system instead.

[remi.duraffort, 2012/11/07 11:59:26]

OK. Im just wondering how to cross compile using GYP as the wiki only speaks
about building v8 for ARM with the simulator on. Is there a document that
explains it ?

[Jakob Kummerow, 2012/11/07 13:25:12]

GYP should be completely transparent to cross-compilation. Export your toolchain
environment variables ($CXX/$LINK), build ("make sh4.release"), done. You'll
have to update at least tools/gyp/v8.gyp (list of source files),
build/common.gypi (build-time switches, compiler flags etc.) and the top-level
Makefile for this to work.

I've updated the wiki page to make cross-compilation instructions clearer.

+      'CCFLAGS':      ['-mieee', '-fno-strict-aliasing'],
+      'CPPDEFINES':   ['V8_TARGET_ARCH_SH4']
+    },
     'arch:mips': {
       'CPPDEFINES':   ['V8_TARGET_ARCH_MIPS'],
       'mips_arch_variant:mips32r2': {
@@ -334,6 +338,11 @@ V8_EXTRA_FLAGS = {
     },
     'disassembler:on': {
       'CPPDEFINES':   ['ENABLE_DISASSEMBLER']
+    },
+    'arch:sh4': {
+      'gpl_disassembler:on': {
+        'CPPDEFINES': ['USE_KERNEL_DISASM']
+      }
     }
   },
   'msvc': {
@@ -831,7 +840,6 @@ D8_FLAGS = {
   'all': {
     'library:shared': {
       'CPPDEFINES': ['V8_SHARED'],
-      'LIBS': ['v8'],
       'LIBPATH': ['.']
     },
   },
@@ -994,7 +1002,7 @@ def GuessStrictAliasing(env):
 
 PLATFORM_OPTIONS = {
   'arch': {
-    'values': ['arm', 'ia32', 'x64', 'mips'],
+    'values': ['arm', 'ia32', 'x64', 'mips', 'sh4'],
     'guess': GuessArch,
     'help': 'the architecture to build for'
   },
@@ -1157,12 +1165,26 @@ SIMPLE_OPTIONS = {
     'default': 'on',
     'help': 'use fpu instructions when building the snapshot [MIPS only]'
   },
+  'backtracesupport': {
+    'values': ['on', 'off'],
+    'default': 'off',
+    'help': 'enable backtrace support for debug'
+  },
+  'logging': {
+    'values': ['on', 'off'],
+    'default': 'off',
+    'help': 'enable logging and profiling'
+  },
+  'gpl_disassembler': {
+    'values': [ 'on', 'off'],
+    'default': 'off',
+    'help': 'enable the disassembler from the linux kernel: This code is GPL, making libv8 GPL if activated'
+  },
   'I_know_I_should_build_with_GYP': {
     'values': ['yes', 'no'],
     'default': 'no',
     'help': 'grace period: temporarily override SCons deprecation'
   }
-
 }
 
 ALL_OPTIONS = dict(PLATFORM_OPTIONS, **SIMPLE_OPTIONS)
@@ -1412,6 +1434,10 @@ def PostprocessOptions(options, os):
     # Print a warning if profiling is enabled without profiling support
     print "Warning: forcing profilingsupport on when prof is on"
     options['profilingsupport'] = 'on'
+  if (options['prof'] != 'off') and (options['logging'] == 'off'):
+    # Print a warning if profiling is enabled without logging
+    print "Warning: forcing logging on when prof is on"
+    options['logging'] = 'on'
   if os == 'win32' and options['pgo'] != 'off' and options['msvcltcg'] == 'off':
     if 'msvcltcg' in ARGUMENTS:
       print "Warning: forcing msvcltcg on as it is required for pgo (%s)" % options['pgo']
@@ -1425,6 +1451,14 @@ def PostprocessOptions(options, os):
     options['debuggersupport'] = 'on'
     options['inspector'] = 'on'
     options['objectprint'] = 'on'
+  if options['backtracesupport'] == 'on':
+     if (options['mode'] == 'release'):
+      # Print a warning that backtrace is deactivated in non release mode
+      print "Warning: forcing backtracesupport off in release mode"
+      options['backtracesupport'] = 'off'
+  # Print a warning if the gpl_disassembler is used in release mode
+  if options['gpl_disassembler'] == 'on' and options['mode'] == 'release':
+      print "Warning: the GPL disassembler is enabled, making libv8 GPL too !"
 
 
 def ParseEnvOverrides(arg, imports):
@@ -1534,6 +1568,7 @@ def BuildSpecific(env, mode, env_overrides, tools):
     shell = d8_env.Program('d8' + suffix, object_files + shell_files)
   else:
     shell = d8_env.Program('d8' + suffix, shell_files)
+    d8_env.Prepend(LIBS=[library_name])
     d8_env.Depends(shell, library)
   context.d8_targets.append(shell)