diff -r 4c248180e576 -r 840132a4a9b3 mozilla-reduce-rust-debuginfo.patch
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mozilla-reduce-rust-debuginfo.patch	Wed Jul 10 08:14:34 2019 +0200
@@ -0,0 +1,34 @@
+# HG changeset patch
+# User msirringhaus@suse.de
+# Date 1560754926 -7200
+#      Mon Jun 17 09:02:06 2019 +0200
+# Node ID 428161c3b9599083e1b8710eda1760f1f707ab11
+# Parent  6cd963b6c82ea6629aaf4050851789b78f310338
+#Description: reduce the rust debuginfo level on selected architectures where
+# compiling with debuginfo=2 causes the OOM killer to interrupt the build on
+# launchpad builders. Initially this was only on 32 bit architectures, but with
+# firefox 63 it started happening frequently on arm64 and ppc64el too.
+
+diff -r 6cd963b6c82e -r 428161c3b959 build/moz.configure/toolchain.configure
+--- a/build/moz.configure/toolchain.configure	Tue May 21 17:26:58 2019 +0200
++++ b/build/moz.configure/toolchain.configure	Mon Jun 17 09:02:06 2019 +0200
+@@ -1865,8 +1865,8 @@
+         return '1' if moz_optimize.optimize else '0'
+ 
+ 
+-@depends(rustc_opt_level, debug_rust, '--enable-debug-symbols')
+-def rust_compile_flags(opt_level, debug_rust, debug_symbols):
++@depends(rustc_opt_level, debug_rust, '--enable-debug-symbols', host)
++def rust_compile_flags(opt_level, debug_rust, debug_symbols, host):
+     # Cargo currently supports only two interesting profiles for building:
+     # development and release. Those map (roughly) to --enable-debug and
+     # --disable-debug in Gecko, respectively.
+@@ -1889,6 +1889,8 @@
+ 
+     if debug_symbols:
+         debug_info = '2'
++        if host.bitness == 32 or host.cpu == 'aarch64' or host.cpu == 'ppc64':
++            debug_info = '1'
+ 
+     opts = []
+