From 53d585e04f1539ec5856608f09635c9031f0f551 Mon Sep 17 00:00:00 2001
From: Nathan Schulte <nmschulte@desmas.net>
Date: Tue, 8 Nov 2022 23:17:07 -0600
Subject: [PATCH] add prune_gcc.sh script

---
 prune_gcc.sh | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100755 prune_gcc.sh

diff --git a/prune_gcc.sh b/prune_gcc.sh
new file mode 100755
index 0000000..1264f7e
--- /dev/null
+++ b/prune_gcc.sh
@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+
+# Prune unused architectures from ARM GCC toolchain releases
+
+set -e
+
+# regex of architectures to retain
+ARCH_REGEX="nofp|v6-m|v7e-m(\+[df]p)?"
+# pruned archive prefix
+RUSEFI_PREFIX="rusefi-"
+# tar compression program
+COMPRESSION_PROGRAM="xz -T0 -9e"
+# compressed tarball suffix, needs to match $COMPRESSION_PROGRAM
+COMPRESSION_SUFFIX=".xz"
+# temporary working directory
+TMP_DIR="/tmp/rusefi-process_gcc"
+
+ARCHIVE="${1}"
+if [ -z "${1}" ]; then
+	echo "usage: ${0} ARCHIVE"
+	exit
+fi
+
+archive_tar="${ARCHIVE%.*}"
+rusefi_archive="${RUSEFI_PREFIX}${archive_tar}${COMPRESSION_SUFFIX}"
+
+# Cleanup prior [failed] runs
+rm -rf "${TMP_DIR}"
+
+# Extract original archive
+echo Extracting ${ARCHIVE}
+dir="$(pwd)"
+mkdir -p "${TMP_DIR}"
+tar -C "${TMP_DIR}" -xaf "${ARCHIVE}"
+pushd "${TMP_DIR}" >/dev/null
+archive_dir="$(echo *)"
+
+# Prune unused architecture objects
+pushd ${archive_dir} >/dev/null
+for path in arm-none-eabi/lib/thumb/*; do
+	arch="${path##*/}"
+	echo ${arch} | grep -Eq ${ARCH_REGEX} \
+		&& continue
+
+	echo Pruning architecture ${arch}
+
+	rm -rf arm-none-eabi/include/c++/*/arm-none-eabi/thumb/${arch}
+	rm -rf arm-none-eabi/lib/thumb/${arch}
+	rm -rf lib/gcc/arm-none-eabi/*/thumb/${arch}
+done
+popd >/dev/null
+
+# Create rusEFI archive
+echo Creating ${rusefi_archive}
+tar -I "${COMPRESSION_PROGRAM}" -cf "${dir}/${rusefi_archive}" "${archive_dir}"
+popd >/dev/null
+
+# Cleanup
+rm -rf "${TMP_DIR}"