23761119fe
This patch cleans up how bits/math-finite.h handles types that are ABI-aliases of other types. For such types, no __*_finite functions exist; instead, bits/math-finite.h must redirect calls to a the functions for a canonical choice of type for each floating-point format. (For the actual public interfaces, symbols need exporting for each type, even those that are ABI-aliases, because of standard requirements that programs can declare the functions themselves without including <math.h>, but that does not apply to __*_finite.) At present, there is a special-case conditional in bits/math-finite.h on __MATH_DECLARING_LDOUBLE && defined __NO_LONG_DOUBLE_MATH to handle redirecting long double function calls to double __*_finite. This patch replaces this by a more general mechanism. math.h, before each inclusion of bits/math-finite.h, defines _MSUFTO_ as the suffix to use on the target of redirection, in addition to the existing _MSUF_. This way, __MATH_DECLARING_LDOUBLE can go away, as can the special conditional in bits/math-finite.h. With this patch, math.h is now prepared for the case of supporting float128 functions as aliases of long double ones on platforms where long double is binary128, with _MSUFTO_ appropriately defined for that case, and appropriate _MSUFTO_ definitions can easily be included when supporting _Float32 / _Float64 / _Float32x / _Float64x (which will always be ABI-aliases of another type when supported). Tested for x86_64, and did a compilation test for ARM with build-many-glibcs.py to cover the long double = double case. * math/math.h (_MSUFTO_): Define and undefine for each inclusion of <bits/math-finite.h>. (__MATH_DECLARING_LDOUBLE): Do not define and undefine for each inclusion of <bits/math-finite.h>. * math/bits/math-finite.h (__REDIRTO_X): Do not define conditionally on [__MATH_DECLARING_LDOUBLE && defined __NO_LONG_DOUBLE_MATH]. (__MATH_REDIRCALL): Use _MSUFTO_ in __REDIRTO call. (__MATH_REDIRCALL_2): Likewise. (__MATH_REDIRCALL_INTERNAL): Likewise. (__REDIRFROM (lgamma, , _MSUF_)): Likewise. (__REDIRFROM (gamma, , _MSUF_)): Likewise. (__REDIRFROM (tgamma, , _MSUF_)): Likewise.
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