From 6e702f8db52831ee8be6e2f2d5b076b3d6b3422f Mon Sep 17 00:00:00 2001
From: klzgrad <kizdiv@gmail.com>
Date: Sun, 1 Dec 2019 03:01:21 +0800
Subject: [PATCH] build: Support MIPS -mtune= flag

---
 src/build/config/compiler/BUILD.gn | 6 ++++++
 src/build/config/mips.gni          | 4 ++++
 2 files changed, 10 insertions(+)

diff --git a/src/build/config/compiler/BUILD.gn b/src/build/config/compiler/BUILD.gn
index 0174fe3cec..6f44a5e65a 100644
--- a/src/build/config/compiler/BUILD.gn
+++ b/src/build/config/compiler/BUILD.gn
@@ -1016,6 +1016,9 @@ config("compiler_cpu_abi") {
       }
 
       cflags += [ "-m${mips_float_abi}-float" ]
+      if (mips_tune != "") {
+        cflags += [ "-mtune=${mips_tune}" ]
+      }
     } else if (current_cpu == "mips" && !is_nacl) {
       ldflags += [ "-Wl,--hash-style=sysv" ]
       if (custom_toolchain == "") {
@@ -1061,6 +1064,9 @@ config("compiler_cpu_abi") {
       }
 
       cflags += [ "-m${mips_float_abi}-float" ]
+      if (mips_tune != "") {
+        cflags += [ "-mtune=${mips_tune}" ]
+      }
     } else if (current_cpu == "mips64el") {
       cflags += [ "-D__SANE_USERSPACE_TYPES__" ]
       ldflags += [ "-Wl,--hash-style=sysv" ]
diff --git a/src/build/config/mips.gni b/src/build/config/mips.gni
index 6365088b14..a796232cc6 100644
--- a/src/build/config/mips.gni
+++ b/src/build/config/mips.gni
@@ -11,6 +11,7 @@ import("//build/config/v8_target_cpu.gni")
 declare_args() {
   # MIPS MultiMedia Instruction compilation flag.
   mips_use_mmi = false
+
 }
 
 if (current_cpu == "mipsel" || v8_current_cpu == "mipsel" ||
@@ -42,6 +43,9 @@ if (current_cpu == "mipsel" || v8_current_cpu == "mipsel" ||
     #   "fp64": sets the GCC -mfp64 option.
     #   "fpxx": sets the GCC -mfpxx option.
     mips_fpu_mode = "fp32"
+
+    # Examples: "24kc", "74kc"
+    mips_tune = ""
   }
 } else if (current_cpu == "mips64el" || v8_current_cpu == "mips64el" ||
            current_cpu == "mips64" || v8_current_cpu == "mips64") {