Enable compilation of GDBJIT interface on Linux.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 125809db52820e9407a0c1ea7ba42b178e436b9f..a6397e195b4d9e338d6eaddc2c213b1703fa315a 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -351,6 +351,7 @@
           ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="netbsd"', {
             'cflags': [ '-Wall', '<(werror)', '-W', '-Wno-unused-parameter',
                         '-Wnon-virtual-dtor', '-Woverloaded-virtual' ],
+            'defines': ['ENABLE_GDB_JIT_INTERFACE',],

[caseq1, 2012/10/15 17:55:19]

This broke debugging of chrome, at least with gdb v7.5 -- gdb fails with "Unable
to read JIT descriptor from remote memory!" followed by "Error accessing memory
address 0xXXXXXXXXX: Input/output error".
Is there a reason that v8_enable_gdbjit variable is not used here? What I would
do instead of unconditionally adding the DEFINE, set the default value of
v8_enable_gdbjit to 1:

'variables': {
  'v8_enable_gdbjit%': 1
}

so that those for whom gdbjit still does not work at least have a way to turn it
off in their include.gypi.

[Michael Starzinger, 2012/10/16 08:19:13]

I'll fix that and make sure that the GDBJIT support can be turned off with a GYP
flag as you suggested.

           }],
           ['OS=="android"', {
             'variables': {