diff -r bb219fd0d646 -r e009fde1282b mozilla-bmo1729124.patch
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mozilla-bmo1729124.patch	Sat Oct 23 08:46:52 2021 +0200
@@ -0,0 +1,50 @@
+
+# HG changeset patch
+# User Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
+# Date 1631000649 0
+# Node ID eac40293649628d32911c909219d514bebb8ce63
+# Parent  6582d77235867224aaf8621bad8ee167dfb31460
+Bug 1729124 - [MIPS64][ARM64] Fix gcc build issue. r=lth
+
+The SpecificRegs struct needs a constructor.
+
+Differential Revision: https://phabricator.services.mozilla.com/D124535
+
+diff --git a/js/src/wasm/WasmBCRegDefs.h b/js/src/wasm/WasmBCRegDefs.h
+--- a/js/src/wasm/WasmBCRegDefs.h
++++ b/js/src/wasm/WasmBCRegDefs.h
+@@ -374,25 +374,31 @@ struct SpecificRegs {
+ };
+ #elif defined(JS_CODEGEN_ARM)
+ struct SpecificRegs {
+   RegI64 abiReturnRegI64;
+ 
+   SpecificRegs() : abiReturnRegI64(ReturnReg64) {}
+ };
+ #elif defined(JS_CODEGEN_ARM64)
+-struct SpecificRegs {};
++struct SpecificRegs {
++  // Required by gcc.
++  SpecificRegs() {}
++};
+ #elif defined(JS_CODEGEN_MIPS32)
+ struct SpecificRegs {
+   RegI64 abiReturnRegI64;
+ 
+   SpecificRegs() : abiReturnRegI64(ReturnReg64) {}
+ };
+ #elif defined(JS_CODEGEN_MIPS64)
+-struct SpecificRegs {};
++struct SpecificRegs {
++  // Required by gcc.
++  SpecificRegs() {}
++};
+ #else
+ struct SpecificRegs {
+ #  ifndef JS_64BIT
+   RegI64 abiReturnRegI64;
+ #  endif
+ 
+   SpecificRegs() { MOZ_CRASH("BaseCompiler porting interface: SpecificRegs"); }
+ };
+