fix gn builds on aix

Introduces `is_aix` variable and suppress non-virtual-dtor warning.

Change-Id: Iab0ceee2309d96b1efcb09fadc710362159da752
Reviewed-on: https://chromium-review.googlesource.com/1103535Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#574143}

build/config/BUILDCONFIG.gn

@@ -291,6 +291,7 @@ if (custom_toolchain != "") {
 # current_os value directly.
 
 if (current_os == "win" || current_os == "winuwp") {
+  is_aix = false
   is_android = false
   is_chromeos = false
   is_fuchsia = false
@@ -301,6 +302,7 @@ if (current_os == "win" || current_os == "winuwp") {
   is_posix = false
   is_win = true
 } else if (current_os == "mac") {
+  is_aix = false
   is_android = false
   is_chromeos = false
   is_fuchsia = false
@@ -311,6 +313,7 @@ if (current_os == "win" || current_os == "winuwp") {
   is_posix = true
   is_win = false
 } else if (current_os == "android") {
+  is_aix = false
   is_android = true
   is_chromeos = false
   is_fuchsia = false
@@ -321,6 +324,7 @@ if (current_os == "win" || current_os == "winuwp") {
   is_posix = true
   is_win = false
 } else if (current_os == "chromeos") {
+  is_aix = false
   is_android = false
   is_chromeos = true
   is_fuchsia = false
@@ -334,6 +338,7 @@ if (current_os == "win" || current_os == "winuwp") {
   # current_os == "nacl" will be passed by the nacl toolchain definition.
   # It is not set by default or on the command line. We treat is as a
   # Posix variant.
+  is_aix = false
   is_android = false
   is_chromeos = false
   is_fuchsia = false
@@ -344,6 +349,7 @@ if (current_os == "win" || current_os == "winuwp") {
   is_posix = true
   is_win = false
 } else if (current_os == "fuchsia") {
+  is_aix = false
   is_android = false
   is_chromeos = false
   is_fuchsia = true
@@ -354,6 +360,7 @@ if (current_os == "win" || current_os == "winuwp") {
   is_posix = false
   is_win = false
 } else if (current_os == "ios") {
+  is_aix = false
   is_android = false
   is_chromeos = false
   is_fuchsia = false
@@ -364,6 +371,7 @@ if (current_os == "win" || current_os == "winuwp") {
   is_posix = true
   is_win = false
 } else if (current_os == "linux") {
+  is_aix = false
   is_android = false
   is_chromeos = false
   is_fuchsia = false
@@ -374,6 +382,7 @@ if (current_os == "win" || current_os == "winuwp") {
   is_posix = true
   is_win = false
 } else if (current_os == "aix") {
+  is_aix = true
   is_android = false
   is_chromeos = false
   is_fuchsia = false

build/config/aix/BUILD.gn

@@ -39,7 +39,7 @@ config("compiler") {
     "-fno-rtti",
     "-fno-exceptions",
     "-Wno-narrowing",
-    "-Wnon-virtual-dtor",
+    "-Wno-non-virtual-dtor",
   ]
 
   ldflags = [

tools/mb/mb.py

@@ -920,6 +920,8 @@ class MetaBuildWrapper(object):
       subdir, exe = 'linux64', 'gn'
     elif self.platform == 'darwin':
       subdir, exe = 'mac', 'gn'
+    elif self.platform == 'aix6':
+      subdir, exe = 'aix', 'gn'
     else:
       subdir, exe = 'win', 'gn.exe'