build: allow to specify custom tags

When building custom `node` versions (e.g., floating features/fixes from
different versions) it's often useful to specify a custom tag which
easily identifies build when invoking `node -v`.

Introduce a way to specify this tag in `node_version.h` file or by
running `./configure --tag="<tag>"`. Insert it right after the patch
version (and before `-pre`, if build is not a release).

Closes #4452.

1 files changed, 7 insertions, 0 deletions

diff --git a/configure b/configure
index a97e964f7b8..36dbdce35a7 100755
--- a/configure
+++ b/configure
@@ -265,6 +265,11 @@ parser.add_option("--xcode",
     dest="use_xcode",
     help="Generate build files for use with xcode")
 
+parser.add_option("--tag",
+    action="store",
+    dest="tag",
+    help="Custom build tag")
+
 (options, args) = parser.parse_args()
 
 
@@ -490,6 +495,8 @@ def configure_node(o):
   else:
     o['variables']['node_use_perfctr'] = 'false'
 
+  o['variables']['node_tag'] = options.tag or ''
+
 
 def configure_libz(o):
   o['variables']['node_shared_zlib'] = b(options.shared_zlib)