More progress on build scripts

Created a config directory for configuration files.
Moved all absolute path variables to a projpaths.py file
All scripts can now universally learn absolute paths via projpaths.py
Moved the config_symbols class to the configuration.py file.
Moved libs to loader since they are only referred by the loader

loader/libs/c/SConstruct

@@ -0,0 +1,51 @@
+# -*- mode: python; coding: utf-8; -*-
+#
+#  Codezero -- a microkernel for embedded systems.
+#
+#  Copyright © 2009  B Labs Ltd
+
+import os, sys, shelve
+
+PROJROOT="../../../"
+cwd = os.getcwd()
+os.chdir(PROJROOT)
+execfile("configure.py")
+os.chdir(cwd)
+
+env = Environment(CC = 'arm-none-eabi-gcc',
+		  # We don't use -nostdinc because sometimes we need standard headers,
+		  # such as stdarg.h e.g. for variable args, as in printk().
+		  CCFLAGS = ['-g', '-mcpu=arm926ej-s', '-nostdlib', '-ffreestanding', \
+			     '-std=gnu99', '-Wall', '-Werror'],
+		  LINKFLAGS = ['-nostdlib', '-T' + "include/l4/arch/arm/linker.lds"],
+		  ASFLAGS = ['-D__ASSEMBLY__'],
+		  PROGSUFFIX = '.elf',			# The suffix to use for final executable
+		  ENV = {'PATH' : os.environ['PATH']},	# Inherit shell path
+		  LIBS = 'gcc',				# libgcc.a - This is required for division routines.
+		  CPPPATH = "#include")
+
+config_shelve = shelve.open(CONFIG_SHELVE)
+#symbols = config_shelve["config_symbols"]
+arch = config_shelve["arch"]
+subarch = config_shelve["subarch"]
+platform = config_shelve["platform"]
+all_syms = config_shelve["all_symbols"]
+
+variant = "baremetal"
+
+e = env.Clone()
+e.Append(CPPPATH = ['include/sys-' + variant + '/arch-' + arch])
+e.Append(CCFLAGS = '-nostdinc')
+
+source = \
+        Glob('src/*.c') + \
+        Glob('src/sys-' + variant + '/*.c') + \
+        Glob('src/sys-' + variant + '/arch-' + arch + '/*.c') + \
+        Glob('src/sys-' + variant + '/arch-' + arch + '/plat-' + platform + '/*.c') + \
+        Glob('src/arch-' + arch + '/*.c') + \
+        Glob('src/arch-' + arch + '/*.S') + \
+        Glob('crt/sys-' + variant + '/arch-' + arch + '/*.[cS]')
+
+objects = e.StaticObject(source)
+library = e.StaticLibrary('c-' + variant, objects)
+#runtime = e.StaticObject('crt/sys-' + variant + '/arch-' + arch + '/crt0.S')