From fb246028d929fbe1acc96e5509805b11979d3284 Mon Sep 17 00:00:00 2001
From: Frances Wingerter <fw@immunant.com>
Date: Wed, 2 Oct 2024 23:15:24 -0400
Subject: [PATCH] add script to build compiler-rt

---
 cross-build-compiler-rt.sh | 10 ++++++++++
 1 file changed, 10 insertions(+)
 create mode 100755 cross-build-compiler-rt.sh

diff --git a/cross-build-compiler-rt.sh b/cross-build-compiler-rt.sh
new file mode 100755
index 000000000000..b37c0b741985
--- /dev/null
+++ b/cross-build-compiler-rt.sh
@@ -0,0 +1,10 @@
+#!/bin/sh
+# see https://llvm.org/docs/HowToCrossCompileBuiltinsOnArm.html
+mkdir -p build-compiler-rt
+cd build-compiler-rt
+cross_flags="--gcc-toolchain=/usr --sysroot=/usr/aarch64-linux-gnu -march=armv8.5-a+memtag -ffixed-x18"
+export LDFLAGS="-L/usr/aarch64-linux-gnu/lib"
+cmake -GNinja -DLLVM_TARGETS_TO_BUILD="AArch64" \
+    -DCMAKE_BUILD_TYPE=RelWithDebInfo \
+    -DLLVM_DEFAULT_TARGET_TRIPLE="aarch64-linux-gnu" -DCMAKE_C_FLAGS="$cross_flags --target=aarch64-linux-gnu" -DCMAKE_CXX_FLAGS="$cross_flags --target=aarch64-linux-gnu" -DCMAKE_C_COMPILER="$(pwd)/../build/bin/clang" -DCMAKE_CXX_COMPILER="$(pwd)/../build/bin/clang" -DCMAKE_BUILD_WITH_INSTALL_RPATH=true -DCOMPILER_RT_BUILD_SANITIZERS=OFF -DCOMPILER_RT_BUILD_MEMPROF=OFF -DCOMPILER_RT_BUILD_ORC=OFF -DCOMPILER_RT_BUILD_XRAY=OFF -DCOMPILER_RT_BUILD_LIBFUZZER=OFF -DCOMPILER_RT_DEFAULT_TARGET_TRIPLE="aarch64-linux-gnu" ../compiler-rt
+ninja