File mozilla-bmo1434526.patch of Package MozillaFirefox.12540

# HG changeset patch
# User Mike Hommey <mh+mozilla@glandium.org>
# Date 1553072836 0
# Node ID a8e6586172fdefe46349797d8aef9cc5e7147d3b
# Parent  0c5057ecdb645afe71d8ce60a4c9d533a73bb000
Bug 1434526 - Make MOZ_SIGNAL_TRAMPOLINE Android-only. r=gsvelto

Bug 1463035 exists to remove it entirely, because as mentioned in bug
1238661 comment 4, we don't actually need this workaround anymore. But
that bug has been blocked for a while because the Android emulator
images we use for testing, for some reason, use a kernel older than any
real device using the same version of Android would use.

Let's however fix the problems it causes with GCC on non-Android ARM
Linux by making it Android-only, rather than removing it entirely.

Differential Revision: https://phabricator.services.mozilla.com/D24134

diff --git a/mfbt/LinuxSignal.h b/mfbt/LinuxSignal.h
--- a/mfbt/LinuxSignal.h
+++ b/mfbt/LinuxSignal.h
@@ -2,17 +2,17 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #ifndef mozilla_LinuxSignal_h
 #define mozilla_LinuxSignal_h
 
 namespace mozilla {
 
-#if defined(__arm__)
+#if defined(__arm__) && defined(__ANDROID__)
 
 // Some (old) Linux kernels on ARM have a bug where a signal handler
 // can be called without clearing the IT bits in CPSR first. The result
 // is that the first few instructions of the handler could be skipped,
 // ultimately resulting in crashes. To workaround this bug, the handler
 // on ARM is a trampoline that starts with enough NOP instructions, so
 // that even if the IT bits are not cleared, only the NOP instructions
 // will be skipped over.