It's not possible to build linux 32 bit on 64 bit host machine with 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 f9e01af1968300094eb290adc62c0786902d420d..dc53717d21458ca3c49018ccd9f86579b472ecc1 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -494,13 +494,13 @@ config("compiler_cpu_abi") {
   if (is_posix && !(is_mac || is_ios)) {
     # CPU architecture. We may or may not be doing a cross compile now, so for
     # simplicity we always explicitly set the architecture.
-    if (current_cpu == "x64") {
+    if (target_cpu == "x64") {

[Dirk Pranke, 2016/06/23 16:22:43]

I think these changes are wrong and the existing code is correct; these changes
will (should?) break binaries built with the host toolchain.

       cflags += [
         "-m64",
         "-march=x86-64",
       ]
       ldflags += [ "-m64" ]
-    } else if (current_cpu == "x86") {
+    } else if (target_cpu == "x86") {
       cflags += [ "-m32" ]
       ldflags += [ "-m32" ]
       if (!is_nacl) {
@@ -510,7 +510,7 @@ config("compiler_cpu_abi") {
           "-mmmx",
         ]
       }
-    } else if (current_cpu == "arm") {
+    } else if (target_cpu == "arm") {
       if (is_clang && !is_android && !is_nacl) {
         cflags += [ "--target=arm-linux-gnueabihf" ]
         ldflags += [ "--target=arm-linux-gnueabihf" ]
@@ -531,12 +531,12 @@ config("compiler_cpu_abi") {
       if (arm_tune != "") {
         cflags += [ "-mtune=$arm_tune" ]
       }
-    } else if (current_cpu == "arm64") {
+    } else if (target_cpu == "arm64") {
       if (is_clang && !is_android && !is_nacl) {
         cflags += [ "--target=aarch64-linux-gnu" ]
         ldflags += [ "--target=aarch64-linux-gnu" ]
       }
-    } else if (current_cpu == "mipsel") {
+    } else if (target_cpu == "mipsel") {
       if (is_clang) {
         # Temporarily needed due to unsupported MIPS macro instructions
         # in inline asm code in third_party projects (libwebp and webrtc).
@@ -620,7 +620,7 @@ config("compiler_cpu_abi") {
       }
 
       cflags += [ "-m${mips_float_abi}-float" ]
-    } else if (current_cpu == "mips64el") {
+    } else if (target_cpu == "mips64el") {
       if (mips_arch_variant == "r6") {
         if (is_clang) {
           if (is_android) {
@@ -645,7 +645,7 @@ config("compiler_cpu_abi") {
         ]
         ldflags += [ "-mips64r2" ]
       }
-    } else if (current_cpu == "pnacl" && is_nacl_nonsfi) {
+    } else if (target_cpu == "pnacl" && is_nacl_nonsfi) {
       if (target_cpu == "x86" || target_cpu == "x64") {
         cflags += [
           "-arch",