Fix bindgen issues (aws-lc-rs) when cross-compiling for armv6hf

Signed-off-by: Dariusz Olszewski <[email protected]>

contrib/cross-compile-armv6hf/Dockerfile

@@ -11,7 +11,7 @@ FROM --platform=linux/amd64 ubuntu:18.04
 
 # Install common packages.
 RUN apt-get update
-RUN apt-get install -y -qq git curl build-essential libasound2-dev libpulse-dev
+RUN apt-get install -y -qq git curl build-essential cmake clang libclang-dev libasound2-dev libpulse-dev
 
 # Install armhf packages.
 RUN echo "deb [arch=armhf] http://ports.ubuntu.com/ubuntu-ports/ bionic main" | tee -a /etc/apt/sources.list

contrib/cross-compile-armv6hf/docker-build.sh

@@ -1,13 +1,17 @@
 #!/usr/bin/env bash
 set -eux
 
-PI1_TOOLS_DIR="/pi/tools/arm-bcm2708/arm-linux-gnueabihf"
+cargo install --force --locked bindgen-cli
+
+PI1_TOOLS_DIR=/pi/tools/arm-bcm2708/arm-linux-gnueabihf
+PI1_TOOLS_SYSROOT_DIR=$PI1_TOOLS_DIR/arm-linux-gnueabihf/sysroot
 
 PI1_LIB_DIRS=(
-  "$PI1_TOOLS_DIR/arm-linux-gnueabihf/sysroot/lib"
-  "$PI1_TOOLS_DIR/arm-linux-gnueabihf/sysroot/usr/lib"
+  "$PI1_TOOLS_SYSROOT_DIR/lib"
+  "$PI1_TOOLS_SYSROOT_DIR/usr/lib"
   "/sysroot/usr/lib/arm-linux-gnueabihf"
 )
 export RUSTFLAGS="-C linker=$PI1_TOOLS_DIR/bin/arm-linux-gnueabihf-gcc ${PI1_LIB_DIRS[*]/#/-L}"
+export BINDGEN_EXTRA_CLANG_ARGS=--sysroot=$PI1_TOOLS_SYSROOT_DIR
 
 cargo build --release --target arm-unknown-linux-gnueabihf --no-default-features --features "alsa-backend with-libmdns"