use os_bsd and OS_BSD and add some OS_FREEBSD conditions

build/common.gypi

 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 1193 matching lines @@
               # Don't warn about printf format problems.
               # This is off by default in gcc but on in Ubuntu's gcc(!).
               '-Wno-format',
             ],
             'cflags_cc!': [
               # TODO(fischman): remove this.
               # http://code.google.com/p/chromium/issues/detail?id=90453
               '-Wsign-compare',
             ]
           }],
-          [ 'os_posix==1 and OS!="mac" and OS!="openbsd" and OS!="android" and chromeos==0', {
+          [ 'os_posix==1 and os_bsd!=1 and OS!="mac" and OS!="android" and chromeos==0', {
             'cflags': [
               # Don't warn about ignoring the return value from e.g. close().
               # This is off by default in some gccs but on by default in others.
               # Currently this option is not set for Chrome OS build because
               # the current version of gcc (4.3.4) used for building Chrome in
               # Chrome OS chroot doesn't support this option.
-              # OpenBSD does not support this option either, since it's using
-              # gcc 4.2.1, which does not have this flag yet.
+              # BSD systems do not support this option either, since they are
+              # usually using gcc 4.2.1, which does not have this flag yet.
               # TODO(mazda): remove the conditional for Chrome OS when gcc
               # version is upgraded.
               '-Wno-unused-result',
             ],
           }],
           [ 'OS=="win"', {
             'defines': [
               '_CRT_SECURE_NO_DEPRECATE',
               '_CRT_NONSTDC_NO_WARNINGS',
               '_CRT_NONSTDC_NO_DEPRECATE',
@@ skipping 44 matching lines @@
               ['exclude', '(^|/)x11_[^/]*\\.(h|cc)$'],
             ],
           }],
           ['toolkit_uses_gtk!=1', {
             'sources/': [
               ['exclude', '_gtk(_unittest)?\\.(h|cc)$'],
               ['exclude', '(^|/)gtk/'],
               ['exclude', '(^|/)gtk_[^/]*\\.(h|cc)$'],
             ],
           }],
-          ['OS!="linux" and OS!="openbsd"', {
+          ['OS!="linux" and OS!="openbsd" and OS!="freebsd"', {
             'sources/': [
               ['exclude', '_xdg(_unittest)?\\.(h|cc)$'],
             ],
           }],
           ['use_wayland!=1', {
             'sources/': [
               ['exclude', '_(wayland)(_unittest)?\\.(h|cc)$'],
               ['exclude', '(^|/)wayland/'],
               ['exclude', '(^|/)(wayland)_[^/]*\\.(h|cc)$'],
             ],
           }],
-          # Do not exclude the linux files on OpenBSD since most of them can be
+          # Do not exclude the linux files on *BSD since most of them can be
           # shared at this point.
           # In case a file is not needed, it is going to be excluded later on.
-          ['OS!="linux" and OS!="openbsd"', {
+          ['OS!="linux" and OS!="openbsd" and OS!="freebsd"', {
             'sources/': [
               ['exclude', '_linux(_unittest)?\\.(h|cc)$'],
               ['exclude', '(^|/)linux/'],
             ],
           }],
           ['OS!="android"', {
             'sources/': [
               ['exclude', '_android(_unittest)?\\.cc$'],
               ['exclude', '(^|/)android/'],
             ],
@@ skipping 1339 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }