Re: [PATCH v4 09/12] target/arm: Make m_helper.c optional via CONFIG_ARM_V7M

[Philippe Mathieu-Daudé]

On 10/3/20 11:48 AM, Richard Henderson wrote:
> On 9/29/20 5:43 PM, Philippe Mathieu-Daudé wrote:
>> +arm_ss.add(when: 'CONFIG_ARM_V7M', if_true: files('m_helper.c'), if_false: 
>> files('m_helper-stub.c'))
>> +
>>  arm_ss.add(zlib)
>>  
>>  arm_ss.add(when: 'CONFIG_TCG', if_true: files('arm-semi.c'))
>> +arm_ss.add(when: 'CONFIG_TCG', if_false: files('m_helper-stub.c'))
> 
> I'm a bit surprised about adding the file twice.
> Since ARM_V7M depends on TCG, isn't the second line redundant?

This does:

if TCG
    if CONFIG_ARM_V7M
        files('m_helper.c')
    else #!V7M
        files('m_helper-stub.c'))
    endif
else #!TCG
    files('m_helper-stub.c'))
endif

So:

if !TCG or !V7M
    files('m_helper-stub.c'))
else
    files('m_helper.c')
endif

There might be a better way to express that in Meson...
I only understood how to do AND with arrays, but not OR.

Paolo/Marc-André, is it possible?

Thanks,

Phil.