[PATCH v2] math: Exclude tgmath3-macro-tests for Clang

[Joseph Myers]

On Thu, 19 Dec 2024, H.J. Lu wrote:

> error: redeclaration of 'var_float' with a different type: 'typeof
> (acospi(vol_var_float))' (aka 'double') vs 'float'
>   264 |   extern typeof (acospi (vol_var_float)) var_float
> __attribute__ ((unused));

So this suggests Clang <tgmath.h> is missing acospi.  Where's the upstream 
issue (to reference in a comment) requesting that Clang <tgmath.h> adds 
all the C23 (+ TS 18661) functions (not limited to those currently 
implemented in glibc or any particular other C library implementation)?

(Almost everything in glibc <tgmath.h> is from C23.  The exceptions are 
scalb and (from TS 18661-1, not in C23) fmaxmag/fminmag.  Also, glibc 
<tgmath.h> supports log10 for complex types and fmax and fmin for _FloatN 
/ _FloatNx, when C23 only has those macros for more limited sets of 
types.)

-- 
Joseph S. Myers
josmyers@redhat.com