Add support for the QNX operating system.

build/toolchain.gypi

Index: build/toolchain.gypi
diff --git a/build/toolchain.gypi b/build/toolchain.gypi
index 684db74d2bfbb4027bd5da2dfe29a2fc535ad6d5..c3b1de0a549e2596eacda057f6f8b9310a528faf 100644
--- a/build/toolchain.gypi
+++ b/build/toolchain.gypi
@@ -357,7 +357,7 @@
         },
       }],
       ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris" \
-         or OS=="netbsd"', {
+         or OS=="netbsd" or OS=="qnx"', {
         'conditions': [
           [ 'v8_no_strict_aliasing==1', {
             'cflags': [ '-fno-strict-aliasing' ],
@@ -368,7 +368,7 @@
         'defines': [ '__C99FEATURES__=1' ],  # isinf() etc.
       }],
       ['(OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris" \
-         or OS=="netbsd" or OS=="mac" or OS=="android") and \
+         or OS=="netbsd" or OS=="mac" or OS=="android" or OS=="qnx") and \
         (v8_target_arch=="arm" or v8_target_arch=="ia32" or \
          v8_target_arch=="mipsel")', {
         # Check whether the host compiler and target compiler support the
@@ -390,7 +390,7 @@
               'clang%': 0,
             },
             'conditions': [
-              ['(OS!="android" or clang==1) and \
+              ['((OS!="android" and OS!="qnx") or clang==1) and \
                 nacl_target_arch!="nacl_x64"', {
                 'cflags': [ '<(m32flag)' ],
                 'ldflags': [ '<(m32flag)' ],
@@ -504,7 +504,8 @@
           },
         },
         'conditions': [
-          ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="netbsd"', {
+          ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="netbsd" or \
+            OS=="qnx"', {
             'cflags': [ '-Wall', '<(werror)', '-W', '-Wno-unused-parameter',
                         '-Wnon-virtual-dtor', '-Woverloaded-virtual',
                         '<(wno_array_bounds)' ],