gyp: send spawned output to logger

Fixes nodejs#532

lib/node-gyp.js

@@ -3,6 +3,7 @@
 const path = require('path')
 const nopt = require('nopt')
 const log = require('npmlog')
+const split = require('split2')
 const childProcess = require('child_process')
 const EE = require('events').EventEmitter
 const inherits = require('util').inherits
@@ -166,10 +167,18 @@ proto.spawn = function spawn (command, args, opts) {
   if (!opts) {
     opts = {}
   }
+
+  var cp = childProcess.spawn(command, args, opts)
+
   if (!opts.silent && !opts.stdio) {
-    opts.stdio = [0, 1, 2]
+    cp.stdout.pipe(split()).on('data', function (line) {
+      log.notice('spawn stdout', line)
+    })
+    cp.stderr.pipe(split()).on('data', function (line) {
+      log.error('spawn stderr', line)
+    })
   }
-  var cp = childProcess.spawn(command, args, opts)
+
   log.info('spawn', command)
   log.info('spawn args', args)
   return cp

package.json

@@ -31,6 +31,7 @@
     "request": "^2.88.0",
     "rimraf": "^2.6.3",
     "semver": "^5.7.1",
+    "split2": "^3.1.1",
     "tar": "^4.4.12",
     "which": "^1.3.1"
   },