Description: starting with firefox 66, armhf builds on Launchpad frequently
 fail with "/usr/bin/ld: final link failed: memory exhausted" when linking
 libxul.so. This is an attempt to reduce the memory used by ld.
Author: Olivier Tilloy <olivier.tilloy@canonical.com>

--- a/build/moz.configure/toolchain.configure
+++ b/build/moz.configure/toolchain.configure
@@ -2287,10 +2287,12 @@
 set_config("LINKER_KIND", select_linker.KIND)
 
 
-@depends_if(select_linker, target, target_sysroot, target_multiarch_dir, c_compiler)
+@depends_if(select_linker, target, target_sysroot, target_multiarch_dir, c_compiler, host)
 @imports("os")
-def linker_ldflags(linker, target, sysroot, multiarch_dir, c_compiler):
+def linker_ldflags(linker, target, sysroot, multiarch_dir, c_compiler, host):
     flags = list((linker and linker.LINKER_FLAG) or [])
+    if host.cpu == "arm":
+        flags.append("-Wl,--no-keep-memory")
     # rpath-link is irrelevant to wasm, see for more info https://github.com/emscripten-core/emscripten/issues/11076.
     if sysroot.path and multiarch_dir and target.os != "WASI":
         for d in ("lib", "usr/lib"):