Add "soname_version" parameter to common.gypi, v8.gyp, Makefile

TEST=compile with component=shared_library and soname_version=1.2.3 and find "libv8-1.2.3.so" in the output.

Review URL: http://codereview.chromium.org/7848017

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9196 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

Makefile

@@ -68,6 +68,10 @@ ifeq ($(vfp3), off)
 else
   GYPFLAGS += -Dv8_can_use_vfp_instructions=true
 endif
+# soname_version=1.2.3
+ifdef soname_version
+  GYPFLAGS += -Dsoname_version=$(soname_version)
+endif
 
 # ----------------- available targets: --------------------
 # - "dependencies": pulls in external dependencies (currently: GYP)

build/common.gypi

@@ -72,6 +72,9 @@
     'v8_use_snapshot%': 'true',
     'host_os%': '<(OS)',
     'v8_use_liveobjectlist%': 'false',
+
+    # For a shared library build, results in "libv8-<(soname_version).so".
+    'soname_version%': '',
   },
   'target_defaults': {
     'conditions': [

tools/gyp/v8.gyp

@@ -71,6 +71,13 @@
                     ],
                   },
                 }],
+                ['soname_version!=""', {
+                  # Ideally, we'd like to specify the full filename for the
+                  # library and set it to "libv8.so.<(soname_version)",
+                  # but currently the best we can do is use 'product_name' and
+                  # get "libv8-<(soname_version).so".
+                  'product_name': 'v8-<(soname_version)',
+                }],
               ],
             },
             {