build: update the GCC toolchain

.cirrus.yml

@@ -0,0 +1 @@
+.github/cirrus-ci/build_toolchain.yml

toolchain/Dockerfile

@@ -2,7 +2,7 @@ FROM ubuntu:22.04 AS builder
 
 RUN apt update && apt upgrade --yes
 RUN DEBIAN_FRONTEND=noninteractive apt install --yes \
-    build-essential texinfo bison git curl rsync gawk python-is-python3 help2man file
+    build-essential texinfo bison flex git curl rsync gawk python-is-python3 help2man file
 
 RUN mkdir -p /opt/patchelf
 RUN curl -L "https://github.com/NixOS/patchelf/releases/download/0.16.1/patchelf-0.16.1-$(uname -m).tar.gz" \

toolchain/generate_toolchan.sh

@@ -267,6 +267,10 @@ function build_binutils_final() {
 	mkdir build
 	cd build
 
+	# Prevent binutils from linking libfl.so
+	export LEX='missing lex'
+	export FLEX='missing flex'
+
 	LDFLAGS="-L${PREFIX}/lib -Wl,-rpath,${PREFIX}/lib \
         -Wl,-dynamic-linker,$(find "${PREFIX}/lib" -name 'ld-linux-*')" \
 		../configure --prefix="${PREFIX}" \
@@ -277,6 +281,9 @@ function build_binutils_final() {
 	make -j "$(nproc)"
 	make install-strip
 
+	unset FLEX
+	unset LEX
+
 	# Remove the old files
 	rm -rf "${PREFIX}/lib/ldscripts"