Add fmt to Folly's open-source dependencies

Reviewed By: yfeldblum

Differential Revision: D14813810

fbshipit-source-id: b6294f0b2e52bd062ad7b1d5977fbe68dec82d1b

build/fbcode_builder/specs/fmt.py

+#!/usr/bin/env python
+# Copyright (c) Facebook, Inc. and its affiliates.
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+
+def fbcode_builder_spec(builder):
+    builder.add_option('fmtlib/fmt:git_hash', '5.3.0')
+    return {
+        'steps': [
+            builder.github_project_workdir('fmtlib/fmt', 'build'),
+            builder.cmake_install('fmtlib/fmt'),
+        ],
+    }

build/fbcode_builder_config.py

@@ -6,6 +6,7 @@ from __future__ import unicode_literals
 
 'fbcode_builder steps to build & test folly'
 
+import specs.fmt as fmt
 import specs.gmock as gmock
 
 from shell_quoting import ShellQuoted
@@ -20,7 +21,7 @@ def fbcode_builder_spec(builder):
         }
     )
     return {
-        'depends_on': [gmock],
+        'depends_on': [fmt, gmock],
         'steps': [
             builder.fb_github_cmake_install('folly/_build'),
             builder.step(