Port the order_profiling GYP flag to GN

build/config/compiler/BUILD.gn

Index: build/config/compiler/BUILD.gn
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index ea96f2eee206ee8e718cf728f63ed8fcbe2b5929..8d591d0fe3a46212139f464c56c800614fdcf84d 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -190,8 +190,11 @@ config("compiler") {
     }
 
     # Linker warnings.
-    if (!(is_chromeos && current_cpu == "arm") && !is_mac && !is_ios) {
+    if (!(is_chromeos && current_cpu == "arm") &&
+        !(is_android && order_profiling) && !is_mac && !is_ios) {
       # TODO(jochen): Enable this on chromeos on arm. http://crbug.com/356580
+      # TODO(azarchs): Fix link errors when linking with order_profiling=1
+      # crbug.com/485542
       ldflags += [ "-Wl,--fatal-warnings" ]
     }
 
@@ -637,6 +640,10 @@ config("compiler") {
     # to say that it does. Define them here instead.
     defines += [ "HAVE_SYS_UIO_H" ]
 
+    if (order_profiling) {
+      defines += [ "CYGPROFILE_INSTRUMENTATION=1" ]

[agrieve, 2015/09/23 19:20:48]

Would be better to put this in the default_finstrument_functions config so that
when a target removes the config they don't have the define still being set
(plus it keeps it out of this catch-all file)

[pkotwicz, 2015/09/23 19:57:08]

I moved this to the finstrument_functions config as you requested

+    }
+
     # Use gold for Android for most CPU architectures.
     if (current_cpu == "x86" || current_cpu == "x64" || current_cpu == "arm") {
       ldflags += [ "-fuse-ld=gold" ]