post_build.py

import os

Import("env")

# https://docs.platformio.org/en/latest/projectconf/advanced_scripting.html
# https://docs.platformio.org/en/latest/projectconf/section_env_build.html#projectconf-dynamic-build-flags


def after_build(source, target, env):
    """Run objdump on the target elf file and save the output in the top dir."""
    objdump = env.subst("${OBJCOPY}").replace("objcopy", "objdump")
    src_elf = env.subst("${BUILD_DIR}/${PROGNAME}.elf")
    # --disassembler-options=no-aliases,numeric
    cmd = " ".join(
        [
            objdump,
            "-SC",
            "--file-start-context",
            "-w",
            src_elf,
            ">",
            "${PROGNAME}.disasm",
        ]
    )  #
    env.Execute(cmd)


env.AddCustomTarget(
    "disasm",
    "${BUILD_DIR}/${PROGNAME}.elf",
    after_build,
    title="Disasm 2",
    description="Generate a disassembly file on demand",
    always_build=True,
)

# The environment can be inspected:
# print(env.Dump())
# print(projenv.Dump())