Make new toolchain work on Linux (#164)

Author: goderbauer

build/config/compiler/BUILD.gn

@@ -571,19 +571,18 @@ config("runtime_library") {
   # check can then be removed. So far, the only target that need x86 don't
   # also require C++14.
   # Tracked in https://fuchsia.atlassian.net/browse/TO-61
-  if (is_linux && current_cpu != "x86") {
-    cflags_cc += [ "-stdlib=libc++" ]
-    ldflags += [
-      "-stdlib=libc++",
-      "-static-libstdc++",
-
-      # Remove one the toolchain distribution is fixed
-      # https://github.com/flutter/flutter/issues/6145
-      "-Wl,-Bstatic",
-      "-lc++abi",
-      "-Wl,-Bdynamic",
-      "-fuse-ld=lld",
-    ]
+  if (is_linux) {
+    if (current_cpu != "x86") {
+      cflags_cc += [ "-stdlib=libc++" ]
+      ldflags += [
+        "-stdlib=libc++",
+        "-static-libstdc++",
+      ]
+    } else {
+      cflags_cc += [ "-stdlib=libstdc++" ]
+      ldflags += [ "-stdlib=libstdc++" ]
+      libs += [ "gcc" ]
+    }
   }
 }