From cfb4ac338e26e8b06db2b3ae8918a5b0ae48497c Mon Sep 17 00:00:00 2001
From: Basilisk-Dev <basiliskdev@protonmail.com>
Date: Wed, 7 Jan 2026 14:22:05 -0500
Subject: [PATCH] MoonchildProductions/UXP#2897: Allow mach configure to pass
 on loongarch64

---
 build/autoconf/config.guess                     | 3 +++
 build/moz.configure/init.configure              | 3 +++
 python/mozbuild/mozbuild/configure/constants.py | 2 ++
 3 files changed, 8 insertions(+)

diff --git a/build/autoconf/config.guess b/build/autoconf/config.guess
index 8fe7583391..5745b0d2bb 100755
--- a/build/autoconf/config.guess
+++ b/build/autoconf/config.guess
@@ -982,6 +982,9 @@ EOF
     k1om:Linux:*:*)
 	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
 	exit ;;
+    loongarch64:Linux:*:*)
+        echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
+        exit ;;
     m32r*:Linux:*:*)
 	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
 	exit ;;
diff --git a/build/moz.configure/init.configure b/build/moz.configure/init.configure
index 372d034cd4..5f121230d9 100644
--- a/build/moz.configure/init.configure
+++ b/build/moz.configure/init.configure
@@ -378,6 +378,9 @@ def split_triplet(triplet):
     elif cpu.startswith('aarch64'):
         canonical_cpu = 'aarch64'
         endianness = 'little'
+    elif cpu.startswith('loongarch64'):
+        canonical_cpu = 'loongarch64'
+        endianness = 'little'
     else:
         die('Unknown CPU type: %s' % cpu)
 
diff --git a/python/mozbuild/mozbuild/configure/constants.py b/python/mozbuild/mozbuild/configure/constants.py
index 4045a80d2b..a2fe78a9db 100644
--- a/python/mozbuild/mozbuild/configure/constants.py
+++ b/python/mozbuild/mozbuild/configure/constants.py
@@ -46,6 +46,7 @@ CPU_bitness = {
     'arm': 32,
     'hppa': 32,
     'ia64': 64,
+    'loongarch64': 64,
     'mips32': 32,
     'mips64': 64,
     'ppc': 32,
@@ -77,6 +78,7 @@ CPU_preprocessor_checks = OrderedDict((
     ('arm', '__arm__ || _M_ARM'),
     ('aarch64', '__aarch64__'),
     ('ia64', '__ia64__'),
+    ('loongarch64', '__loongarch64'),
     ('s390x', '__s390x__'),
     ('s390', '__s390__'),
     ('ppc64', '__powerpc64__ || __ppc64__'),