build: add CONFIG_APP_REPRODUCIBLE_BUILD menuconfig option to produce reproducible binaries

tools/ci/executable-list.txt

@@ -67,6 +67,7 @@ tools/ci/test_build_system.sh
 tools/ci/test_build_system_cmake.sh
 tools/ci/test_check_kconfigs.py
 tools/ci/test_configure_ci_environment.sh
+tools/ci/test_reproducible_build.sh
 tools/cmake/convert_to_cmake.py
 tools/docker/entrypoint.sh
 tools/docker/hooks/build

tools/ci/test_reproducible_build.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+
+set -euo
+
+for path in \
+  "examples/get-started/hello_world" \
+  "examples/bluetooth/nimble/blecent"; do
+  cd "${IDF_PATH}/${path}"
+
+  echo "CONFIG_APP_REPRODUCIBLE_BUILD=y" >>sdkconfig.defaults
+  rm -f sdkconfig
+
+  idf.py -B build_first fullclean build
+  idf.py -B build_second fullclean build
+
+  for item in \
+    "partition_table/partition-table.bin" \
+    "bootloader/bootloader.bin" \
+    "bootloader/bootloader.elf" \
+    "bootloader/bootloader.map" \
+    "*.bin" \
+    "*.elf" \
+    "*.map"; do
+    diff -s build_first/${item} build_second/${item} # use glob, don't use double quotes
+  done
+done