[MIPS] Adding NaCl/PNaCl support for mipsel 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 588db2bca8e6df2ffbedbfc18d3531a1d1d46db4..94bad898bca4c921a4cc60feba24ffddc3b4fb7d 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -535,7 +535,7 @@ config("compiler_cpu_abi") {
         cflags += [ "--target=aarch64-linux-gnu" ]
         ldflags += [ "--target=aarch64-linux-gnu" ]
       }
-    } else if (current_cpu == "mipsel") {
+    } else if (current_cpu == "mipsel" && !is_nacl) {

[brettw, 2016/08/12 19:52:40]

This nacl check doesn't make immediate sense to me. Why wouldn't the mips arch
variants apply to nacl code?

[lmilko, 2016/08/15 14:56:10]

mipsel-nacl-clang compiler does not need any of the flags defined in this block.
Alternative would be to add !is_nacl checks for each cflags and ldflags, not to
include -fno-integrated-as, --target, -march, -mcpu and dsp flags.

       if (is_clang) {
         # Temporarily needed due to unsupported MIPS macro instructions
         # in inline asm code in third_party projects (libwebp and webrtc).