GN: Add BUILD.gn file to third_party/jsoncpp

build/config/linux/BUILD.gn

Index: build/config/linux/BUILD.gn
diff --git a/build/config/linux/BUILD.gn b/build/config/linux/BUILD.gn
index 7241ad6b29be0259651a029deae099fa6ece2dc9..a79748ac5016ad695a2112ec126e2e07d3b9cdb4 100644
--- a/build/config/linux/BUILD.gn
+++ b/build/config/linux/BUILD.gn
@@ -2,6 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//build/config/crypto.gni")
 import("//build/config/linux/pkg_config.gni")
 import("//build/config/sysroot.gni")
 
@@ -52,6 +53,34 @@ pkg_config("dbus") {
   packages = [ "dbus-1" ]
 }
 
+config("no_openssl_config") {
+  # TODO(kjellander): Find out how to convert GYP include_dirs+ (i.e. insert
+  # first in the include path?).
+  include_dirs = [ "//net/third_party/nss/ssl" ]
+
+  configs = [ "//third_party/nss:system_nss_no_ssl_config" ]
+}
+
+config("ssl") {
+  if (use_openssl) {
+    deps = [ "//third_party/openssl" ]
+  } else {
+    deps = [ "//net/third_party/nss/ssl:libssl" ]

[brettw, 2014/06/11 16:58:35]

The rule is that stuff in src/build can't depend on anything outside of that for
layering purposes. This is one of the reasons that all the crypto config was
moved out of the build directory. If you need this and don't want to depend on
/crypto (it's pretty small), you should probably duplicate this.

[kjellander_chromium, 2014/06/11 19:22:04]

OK, I'll duplicate this in WebRTC for now. I don't know enough about openssl/nss
and all that to refactor those things or introduce a dependency on src/crypto
right now. I just wanted to provide a close-to-GYP solution for now. I'll add it
to https://review.webrtc.org/17669004 instead.

+
+    direct_dependent_configs = [
+      ":ssl_include_config",
+    ]
+
+    if (is_clang) {
+      cflags += [
+        # There is a broken header guard in /usr/include/nss/secmod.h:
+        # https://bugzilla.mozilla.org/show_bug.cgi?id=884072
+        "-Wno-header-guard",
+      ]
+    }
+  }
+}
+
 config("x11") {
   # Don't bother running pkg-config for these X related libraries since it just
   # returns the same libs, and forking pkg-config is slow.