Add libm_alias_*_other_r macros.

Some libm functions are unable to use the generic alias macros such as
libm_alias_double because they have special symbol versioning
requirements for the main float, double or long double public names.

To facilitate adding _FloatN / _FloatNx function aliases in future,
it's still desirable to have generic macros those functions can use as
far as possible.  This patch adds macros such as
libm_alias_double_other, which only define names for _FloatN /
_FloatNx aliases, not for float / double / long double.  As present,
all these new macros do nothing, but they are called in the
appropriate places in macros such as libm_alias_double.  This patch
also arranges for lgamma implementations, and the recently added
optimized float function implementations, to use the new macros to
make them ready for addition of _FloatN / _FloatNx aliases.

Tested for x86_64, and tested with build-many-glibcs.py that installed
stripped shared libraries are unchanged by this patch.

	* sysdeps/generic/libm-alias-double.h (libm_alias_double_other_r):
	New macro.
	(libm_alias_double_other): Likewise.
	(libm_alias_double_r): Use libm_alias_double_other_r.
	* sysdeps/generic/libm-alias-float.h (libm_alias_float_other_r):
	New macro.
	(libm_alias_float_other): Likewise.
	(libm_alias_float_r): Use libm_alias_float_other_r.
	* sysdeps/generic/libm-alias-float128.h
	(libm_alias_float128_other_r): New macro.
	(libm_alias_float128_other): Likewise.
	(libm_alias_float128_r): Use libm_alias_float128_other_r.
	* sysdeps/generic/libm-alias-ldouble.h
	(libm_alias_ldouble_other_r): New macro.
	(libm_alias_ldouble_other): Likewise.
	(libm_alias_ldouble_r): Use libm_alias_ldouble_other_r.
	* sysdeps/ieee754/ldbl-opt/libm-alias-double.h
	(libm_alias_double_other_r): New macro.
	(libm_alias_double_other): Likewise.
	(libm_alias_double_r): Use libm_alias_double_other_r.
	* sysdeps/ieee754/ldbl-opt/libm-alias-ldouble.h
	(libm_alias_ldouble_other_r): New macro.
	(libm_alias_ldouble_other): Likewise.
	(libm_alias_ldouble_r): Use libm_alias_ldouble_other_r.
	* math/w_lgamma_main.c: Include <libm-alias-double.h>.
	[!USE_AS_COMPAT]: Use libm_alias_double_other.
	* math/w_lgammaf_main.c: Include <libm-alias-float.h>.
	[!USE_AS_COMPAT]: Use libm_alias_float_other.
	* math/w_lgammal_main.c: Include <libm-alias-ldouble.h>.
	[!USE_AS_COMPAT]: Use libm_alias_ldouble_other.
	* math/w_exp2f.c: Use libm_alias_float_other.
	* math/w_expf.c: Likewise.
	* math/w_log2f.c: Likewise.
	* math/w_logf.c: Likewise.
	* math/w_powf.c: Likewise.
	* sysdeps/ieee754/flt-32/e_exp2f.c: Include <libm-alias-float.h>.
	[!__exp2f]: Use libm_alias_float_other.
	* sysdeps/ieee754/flt-32/e_expf.c: Include <libm-alias-float.h>.
	[!__expf]: Use libm_alias_float_other.
	* sysdeps/ieee754/flt-32/e_log2f.c: Include <libm-alias-float.h>.
	[!__log2f]: Use libm_alias_float_other.
	* sysdeps/ieee754/flt-32/e_logf.c: Include <libm-alias-float.h>.
	[!__logf]: Use libm_alias_float_other.
	* sysdeps/ieee754/flt-32/e_powf.c: Include <libm-alias-float.h>.
	[!__powf]: Use libm_alias_float_other.

1 files changed, 14 insertions, 2 deletions

diff --git a/sysdeps/generic/libm-alias-double.h b/sysdeps/generic/libm-alias-double.h
index 23b5990e36..0593ad9886 100644
--- a/sysdeps/generic/libm-alias-double.h
+++ b/sysdeps/generic/libm-alias-double.h
@@ -19,6 +19,16 @@
 #ifndef _LIBM_ALIAS_DOUBLE_H
 #define _LIBM_ALIAS_DOUBLE_H
 
+/* Define _FloatN / _FloatNx aliases for a double libm function that
+   has internal name FROM ## R and public names TO ## suffix ## R for
+   each suffix of a supported _FloatN / _FloatNx floating-point type
+   with the same format as double.  */
+#define libm_alias_double_other_r(from, to, r)
+
+/* Likewise, but without the R suffix.  */
+#define libm_alias_double_other(from, to)	\
+  libm_alias_double_other_r (from, to, )
+
 /* Define aliases for a double libm function that has internal name
    FROM ## R and public names TO ## suffix ## R for each suffix of a
    supported floating-point type with the same format as double.  This
@@ -30,10 +40,12 @@
 # define libm_alias_double_r(from, to, r)	\
   weak_alias (from ## r, to ## r)		\
   strong_alias (from ## r, from ## l ## r)	\
-  weak_alias (from ## r, to ## l ## r)
+  weak_alias (from ## r, to ## l ## r)		\
+  libm_alias_double_other_r (from, to, r)
 #else
 # define libm_alias_double_r(from, to, r)	\
-  weak_alias (from ## r, to ## r)
+  weak_alias (from ## r, to ## r)		\
+  libm_alias_double_other_r (from, to, r)
 #endif
 
 /* Likewise, but without the R suffix.  */