[PATCH v2] C-SKY: Strip hard float abi from hard float feature.

[Adhemerval Zanella Netto]

On 27/01/23 22:48, Xianmiao Qu wrote:
> On Fri, Jan 27, 2023 at 04:24:32PM -0300, Adhemerval Zanella Netto wrote:
>>
>>
>> It is not clear to me why you need to use '-mfloat-abi=softfp' to check 
>> for soft-float ABI, since it *won't* be used to actually build glibc
>> (meaning that the compiler build invocation not necessary will use the
>> same ABI as the test is doing).
>>
> 
> This is for compatibility with versions prior to GCC 11. The older versions
> of C-SKY GCC don't support -mfloat-abi=softfp, so the '__CSKY_HARD_FLOAT_ABI__'
> is always not defined, and the expression 'defined(__CSKY_HARD_FLOAT__) && !defined(__CSKY_HARD_FLOAT_ABI__)'
> which is correct for newer versions of GCC does not work for older versions.
> And there doesn't seem to be an expression compitable with all versions of GCC,
> so I add the check for the '-mfloat-abi=softfp' option.

Right, so please add a comment that the -mfloat-abi=softfp is to check for
older gcc version on the configure.ac (similar to the current one).