From 81385fe53ffde5e1636e9ace0736d914da8dbc0f Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Sun, 24 Oct 2021 22:32:50 -0700
Subject: [PATCH] Add RISCV32 support

Upstream-Status: Pending
Signed-off-by: Khem Raj <raj.khem@gmail.com>

---
 build/moz.configure/init.configure                             | 3 +++
 python/mozbuild/mozbuild/configure/constants.py                | 2 ++
 .../mozbuild/test/configure/test_toolchain_configure.py        | 1 +
 3 files changed, 6 insertions(+)

diff --git a/build/moz.configure/init.configure b/build/moz.configure/init.configure
index 0b7a2ff60f..54f8325b44 100644
--- a/build/moz.configure/init.configure
+++ b/build/moz.configure/init.configure
@@ -524,6 +524,9 @@ def split_triplet(triplet, allow_msvc=False, allow_wasi=False):
     elif cpu.startswith("aarch64"):
         canonical_cpu = "aarch64"
         endianness = "little"
+    elif cpu in ("riscv32", "riscv32gc"):
+        canonical_cpu = "riscv32"
+        endianness = "little"
     elif cpu in ("riscv64", "riscv64gc"):
         canonical_cpu = "riscv64"
         endianness = "little"
diff --git a/python/mozbuild/mozbuild/configure/constants.py b/python/mozbuild/mozbuild/configure/constants.py
index c71460cb20..15bef93e19 100644
--- a/python/mozbuild/mozbuild/configure/constants.py
+++ b/python/mozbuild/mozbuild/configure/constants.py
@@ -53,6 +53,7 @@ CPU_bitness = {
     "mips64": 64,
     "ppc": 32,
     "ppc64": 64,
+    'riscv32': 32,
     "riscv64": 64,
     "s390": 32,
     "s390x": 64,
@@ -95,6 +96,7 @@ CPU_preprocessor_checks = OrderedDict(
         ("m68k", "__m68k__"),
         ("mips64", "__mips64"),
         ("mips32", "__mips__"),
+        ("riscv32", "__riscv && __riscv_xlen == 32"),
         ("riscv64", "__riscv && __riscv_xlen == 64"),
         ("loongarch64", "__loongarch64"),
         ("sh4", "__sh__"),
diff --git a/python/mozbuild/mozbuild/test/configure/test_toolchain_configure.py b/python/mozbuild/mozbuild/test/configure/test_toolchain_configure.py
index 059cde0139..4f9986eb31 100644
--- a/python/mozbuild/mozbuild/test/configure/test_toolchain_configure.py
+++ b/python/mozbuild/mozbuild/test/configure/test_toolchain_configure.py
@@ -1192,6 +1192,7 @@ class LinuxCrossCompileToolchainTest(BaseToolchainTest):
         "m68k-unknown-linux-gnu": big_endian + {"__m68k__": 1},
         "mips64-unknown-linux-gnuabi64": big_endian + {"__mips64": 1, "__mips__": 1},
         "mips-unknown-linux-gnu": big_endian + {"__mips__": 1},
+        "riscv32-unknown-linux-gnu": little_endian + {"__riscv": 1, "__riscv_xlen": 32},
         "riscv64-unknown-linux-gnu": little_endian + {"__riscv": 1, "__riscv_xlen": 64},
         "sh4-unknown-linux-gnu": little_endian + {"__sh__": 1},
     }