Clean up Makefile, enable MIPS cross-compilation

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 21fbb742b43ea80b005b50260b9105794c35615c..0b758fe3bd14dad46fbc131aad01953f0bbf5615 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -173,8 +173,11 @@
             'defines': [
               'V8_TARGET_ARCH_MIPS',
             ],
+            'variables': {
+              'mipscompiler': '<!((echo | $(echo ${CXX:-$(which g++)}) -EL -E - > /dev/null 2>&1) && echo -n "yes" || echo -n "no")',

[palfia, 2012/05/02 18:39:21]

This command:
echo | $(echo ${CXX:-$(which g++)}) -EL -E -
always returns 0 on my system, even if gcc doesn't support mips target.
My suggestion is to use -march=mips32r3 instead of -EL .
So the actual command would be:
(echo | $(echo ${CXX:-$(which g++)}) -march=mips32r2 -E - > /dev/null 2>&1) &&
echo -n "yes" || echo -n "no")

[palfia, 2012/05/02 18:54:50]

Small typo: "-march=mips32r3" should be "-march=mips32r2"

+            },
             'conditions': [
-              [ 'target_arch=="mips"', {
+              ['mipscompiler=="yes"', {
                 'target_conditions': [
                   ['_toolset=="target"', {
                     'cflags': ['-EL'],