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.

7 files changed, 34 insertions, 2 deletions

diff --git a/sysdeps/ieee754/flt-32/e_exp2f.c b/sysdeps/ieee754/flt-32/e_exp2f.c
index 31b660b..c8eca40 100644
--- a/sysdeps/ieee754/flt-32/e_exp2f.c
+++ b/sysdeps/ieee754/flt-32/e_exp2f.c
@@ -19,6 +19,7 @@
 #include <math.h>
 #include <stdint.h>
 #include <shlib-compat.h>
+#include <libm-alias-float.h>
 #include "math_config.h"
 
 /*
@@ -90,4 +91,5 @@ __exp2f (float x)
 strong_alias (__exp2f, __ieee754_exp2f)
 strong_alias (__exp2f, __exp2f_finite)
 versioned_symbol (libm, __exp2f, exp2f, GLIBC_2_27);
+libm_alias_float_other (__exp2, exp2)
 #endif
diff --git a/sysdeps/ieee754/flt-32/e_expf.c b/sysdeps/ieee754/flt-32/e_expf.c
index 74a383a..e449d5c 100644
--- a/sysdeps/ieee754/flt-32/e_expf.c
+++ b/sysdeps/ieee754/flt-32/e_expf.c
@@ -24,6 +24,7 @@
 #include <math.h>
 #include <stdint.h>
 #include <shlib-compat.h>
+#include <libm-alias-float.h>
 #include "math_config.h"
 
 /*
@@ -111,4 +112,5 @@ hidden_def (__expf)
 strong_alias (__expf, __ieee754_expf)
 strong_alias (__expf, __expf_finite)
 versioned_symbol (libm, __expf, expf, GLIBC_2_27);
+libm_alias_float_other (__exp, exp)
 #endif
diff --git a/sysdeps/ieee754/flt-32/e_log2f.c b/sysdeps/ieee754/flt-32/e_log2f.c
index ef13b37..24cc11d 100644
--- a/sysdeps/ieee754/flt-32/e_log2f.c
+++ b/sysdeps/ieee754/flt-32/e_log2f.c
@@ -19,6 +19,7 @@
 #include <math.h>
 #include <stdint.h>
 #include <shlib-compat.h>
+#include <libm-alias-float.h>
 #include "math_config.h"
 
 /*
@@ -90,4 +91,5 @@ __log2f (float x)
 strong_alias (__log2f, __ieee754_log2f)
 strong_alias (__log2f, __log2f_finite)
 versioned_symbol (libm, __log2f, log2f, GLIBC_2_27);
+libm_alias_float_other (__log2, log2)
 #endif
diff --git a/sysdeps/ieee754/flt-32/e_logf.c b/sysdeps/ieee754/flt-32/e_logf.c
index ea847b5..80fec73 100644
--- a/sysdeps/ieee754/flt-32/e_logf.c
+++ b/sysdeps/ieee754/flt-32/e_logf.c
@@ -19,6 +19,7 @@
 #include <math.h>
 #include <stdint.h>
 #include <shlib-compat.h>
+#include <libm-alias-float.h>
 #include "math_config.h"
 
 /*
@@ -89,4 +90,5 @@ __logf (float x)
 strong_alias (__logf, __ieee754_logf)
 strong_alias (__logf, __logf_finite)
 versioned_symbol (libm, __logf, logf, GLIBC_2_27);
+libm_alias_float_other (__log, log)
 #endif
diff --git a/sysdeps/ieee754/flt-32/e_powf.c b/sysdeps/ieee754/flt-32/e_powf.c
index 08d2c6d..1c59b77 100644
--- a/sysdeps/ieee754/flt-32/e_powf.c
+++ b/sysdeps/ieee754/flt-32/e_powf.c
@@ -19,6 +19,7 @@
 #include <math.h>
 #include <stdint.h>
 #include <shlib-compat.h>
+#include <libm-alias-float.h>
 #include "math_config.h"
 
 /*
@@ -219,4 +220,5 @@ __powf (float x, float y)
 strong_alias (__powf, __ieee754_powf)
 strong_alias (__powf, __powf_finite)
 versioned_symbol (libm, __powf, powf, GLIBC_2_27);
+libm_alias_float_other (__pow, pow)
 #endif
diff --git a/sysdeps/ieee754/ldbl-opt/libm-alias-double.h b/sysdeps/ieee754/ldbl-opt/libm-alias-double.h
index 5ae4c8b..4c22ffb 100644
--- a/sysdeps/ieee754/ldbl-opt/libm-alias-double.h
+++ b/sysdeps/ieee754/ldbl-opt/libm-alias-double.h
@@ -23,6 +23,16 @@
 #include <first-versions.h>
 #include <ldbl-compat-choose.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
@@ -36,7 +46,8 @@
     (compat_symbol (libm,					\
 		    from ## r,					\
 		    to ## l ## r,				\
-		    FIRST_VERSION_libm_ ## to ## l ## r), );
+		    FIRST_VERSION_libm_ ## to ## l ## r), );	\
+  libm_alias_double_other_r (from, to, r)
 
 /* Likewise, but without the R suffix.  */
 #define libm_alias_double(from, to) libm_alias_double_r (from, to, )
diff --git a/sysdeps/ieee754/ldbl-opt/libm-alias-ldouble.h b/sysdeps/ieee754/ldbl-opt/libm-alias-ldouble.h
index ae32027..291a5f5 100644
--- a/sysdeps/ieee754/ldbl-opt/libm-alias-ldouble.h
+++ b/sysdeps/ieee754/ldbl-opt/libm-alias-ldouble.h
@@ -22,6 +22,16 @@
 #include <math_ldbl_opt.h>
 #include <ldbl-compat-choose.h>
 
+/* Define _FloatN / _FloatNx aliases for a long double libm function
+   that has internal name FROM ## l ## R and public names TO ## suffix
+   ## R for each suffix of a supported _FloatN / _FloatNx
+   floating-point type with the same format as long double.  */
+#define libm_alias_ldouble_other_r(from, to, r)
+
+/* Likewise, but without the R suffix.  */
+#define libm_alias_ldouble_other(from, to)	\
+  libm_alias_ldouble_other_r (from, to, )
+
 /* Define aliases for a long double libm function that has internal
    name FROM ## l ## R and public names TO ## suffix ## R for each
    suffix of a supported floating-point type with the same format as
@@ -33,7 +43,8 @@
 #define libm_alias_ldouble_r(from, to, r)			\
   LONG_DOUBLE_COMPAT_CHOOSE_libm_ ## to ## l ## r		\
     (long_double_symbol (libm, from ## l ## r, to ## l ## r),	\
-     weak_alias (from ## l ## r, to ## l ## r));
+     weak_alias (from ## l ## r, to ## l ## r));		\
+  libm_alias_ldouble_other_r (from, to, r)
 
 /* Likewise, but without the R suffix.  */
 #define libm_alias_ldouble(from, to) libm_alias_ldouble_r (from, to, )