Update ASFLAGS for pioarduino

[Jason2866]

currently the ASFLAG is set with the basic features.
The PR sets the ASFLAG accordingly to the setting done in CFLAGS

Tested and verified working in fork. The change only affects pioarduino

@me-no-dev

[troyhacks]

@Jason2866 I appreciate this. Thank you for looking into it!

[troyhacks]

Almost fixes it!

Current patch gives me:

ASFLAGS=[
    "-march=rv32imafc_zicsr_zifencei_xesppie"
],

ASPPFLAGS=[
    "-x", "assembler-with-cpp"
],

...which gives me p4_mul16x16.S.o: can't link soft-float modules with single-float modules for my p4_mul16x16.S file.

My experience says we need a bit more defined:

ASFLAGS=[
    "-march=rv32imafc_zicsr_zifencei_xesppie",
    "-mabi=ilp32f"
],

ASPPFLAGS=[
    "-x", "assembler-with-cpp",
    "-march=rv32imafc_zicsr_zifencei_xesppie",
    "-mabi=ilp32f"
],

[Jason2866]

@troyhacks Mhh, in this case, the way it is done to provide the SCons flags ASFLAGS and ASPPFLAGS needs to be rethinked.
Will test if it works to use all AS_FLAGS for both

[Jason2866]

The needed flags are in PIOARDUINO_CXX_FLAGS or PIOARDUINO_CC_FLAGS (depends on MCU) and are extracted now from there. No hard coded arch flags now.

[Jason2866]

For the P4 the result is now

env.Append(
    ASFLAGS=[
        "-march=rv32imafc_zicsr_zifencei_xesppie",
        "-mabi=ilp32f",
    ],

    ASPPFLAGS=[
        "-march=rv32imafc_zicsr_zifencei_xesppie",
        "-mabi=ilp32f",
        "-x", "assembler-with-cpp"
    ],

[troyhacks]

Amazing. I will try the next time I build!