[iOS/GN] Fix generation of .dSYM for fat binary builds.

build/config/mac/BUILD.gn

Index: build/config/mac/BUILD.gn
diff --git a/build/config/mac/BUILD.gn b/build/config/mac/BUILD.gn
index d49db4383625bb254a07fcca49377c13ce8f2b55..95ed002150fdf3e15d2bf57c3fa59e35d1bf14b4 100644
--- a/build/config/mac/BUILD.gn
+++ b/build/config/mac/BUILD.gn
@@ -3,6 +3,7 @@
 # found in the LICENSE file.
 
 import("//build/config/sysroot.gni")
+import("//build/config/ios/ios_sdk.gni")
 import("//build/config/mac/mac_sdk.gni")
 import("//build/config/mac/symbols.gni")
 
@@ -103,7 +104,7 @@ config("mac_executable_flags") {
 # from a binary, but some targets may wish to specify a saves file to preserve
 # specific symbols.
 config("strip_all") {
-  if (enable_stripping) {
+  if (enable_stripping && (!is_ios || additional_toolchains == [])) {

[Robert Sesek, 2016/07/18 20:09:42]

Considering making |!is_ios || additional_toolchains == []| a variable, given
that it's a bit unwieldy to reason about.

[sdefresne, 2016/07/19 09:12:12]

Done.

     ldflags = [ "-Wcrl,strip,-x,-S" ]
   }
 }