Make more libm functions into weak aliases.

Many libm functions define the function as __<func> and then define
<func> as a weak alias.  This is not at all limited to cases where
there is an internal call that has namespace reasons to need to call
__<func> instead of <func>.

The common macros for creating libm function aliases work on the basis
of public function names all being aliases; that is, they define
aliases for functions using the above pattern.  Thus, where a function
just defines the public name <func> directly, changing that to be a
weak alias enables a subsequent conversion to the common macros to
retain the exact existing symbols (and so be testable by comparison of
stripped binaries).

This patch converts many existing functions to use the weak alias
pattern, as preparation for subsequent conversions to common macros.
I do expect that _FloatN/_FloatNx function aliases will end up needing
new variants of the common macros that do *not* create the original
float / double / long double name of a function - for cases where that
name is created specially to give it a particular symbol version, for
example - but for functions that can use the most common macros to
create all the public names as aliases, it makes sense for them to do
so.

Regarding the Bessel function wrappers in this patch: only float and
double wrappers are changed because the long double wrappers already
used the weak alias pattern.

Tested for x86_64, and with build-many-glibcs.py.

	* include/math.h (roundeven): Change hidden_proto call to
	__roundeven.
	* math/w_j0_compat.c (j0): Rename to __j0 and define as weak
	alias.
	[NO_LONG_DOUBLE] (__j0l): New strong alias.
	(y0): Rename to __y0 and define as weak alias.
	[NO_LONG_DOUBLE] (__y0l): New strong alias.
	* math/w_j0f_compat.c (j0f): Rename to __j0f and define as weak
	alias.
	(y0f): Rename to __y0f and define as weak alias.
	* math/w_j1_compat.c (j1): Rename to __j1 and define as weak
	alias.
	[NO_LONG_DOUBLE] (__j1l): New strong alias.
	(y1): Rename to __y1 and define as weak alias.
	[NO_LONG_DOUBLE] (__y1l): New strong alias.
	* math/w_j1f_compat.c (j1f): Rename to __j1f and define as weak
	alias.
	(y1f): Rename to __y1f and define as weak alias.
	* math/w_jn_compat.c (jn): Rename to __jn and define as weak
	alias.
	[NO_LONG_DOUBLE] (__jnl): New strong alias.
	(yn): Rename to __yn and define as weak alias.
	[NO_LONG_DOUBLE] (__ynl): New strong alias.
	* math/w_jnf_compat.c (jnf): Rename to __jnf and define as weak
	alias.
	(ynf): Rename to __ynf and define as weak alias.
	* sysdeps/ieee754/dbl-64/s_fromfp.c (FUNC): Define to __fromfp.
	(fromfp): Define as weak alias.
	[NO_LONG_DOUBLE] (__fromfpl): New strong alias.
	* sysdeps/ieee754/dbl-64/s_fromfpx.c (FUNC): Define to __fromfpx.
	(fromfpx): Define as weak alias.
	[NO_LONG_DOUBLE] (__fromfpxl): New strong alias.
	* sysdeps/ieee754/dbl-64/s_getpayload.c (getpayload): Rename to
	__getpayload and define as weak alias.
	[NO_LONG_DOUBLE] (__getpayloadl): New strong alias.
	* sysdeps/ieee754/dbl-64/s_roundeven.c (roundeven): Rename to
	__roundeven and define as weak alias.
	[NO_LONG_DOUBLE] (__roundevenl): New strong alias.
	* sysdeps/ieee754/dbl-64/s_setpayload.c (FUNC): Define to
	__setpayload.
	(setpayload): Define as weak alias.
	[NO_LONG_DOUBLE] (__setpayloadl): New strong alias.
	* sysdeps/ieee754/dbl-64/s_setpayloadsig.c (FUNC): Define to
	__setpayloadsig.
	(setpayloadsig): Define as weak alias.
	[NO_LONG_DOUBLE] (__setpayloadsigl): New strong alias.
	* sysdeps/ieee754/dbl-64/s_totalorder.c (totalorder): Rename to
	__totalorder and define as weak alias.
	[NO_LONG_DOUBLE] (__totalorderl): New strong alias.
	* sysdeps/ieee754/dbl-64/s_totalordermag.c (totalordermag): Rename
	to __totalordermag and define as weak alias.
	[NO_LONG_DOUBLE] (__totalordermagl): New strong alias.
	* sysdeps/ieee754/dbl-64/s_ufromfp.c (FUNC): Define to __ufromfp.
	(ufromfp): Define as weak alias.
	[NO_LONG_DOUBLE] (__ufromfpl): New strong alias.
	* sysdeps/ieee754/dbl-64/s_ufromfpx.c (FUNC): Define to
	__ufromfpx.
	(ufromfpx): Define as weak alias.
	[NO_LONG_DOUBLE] (__ufromfpxl): New strong alias.
	* sysdeps/ieee754/dbl-64/wordsize-64/s_getpayload.c (getpayload):
	Rename to __getpayload and define as weak alias.
	[NO_LONG_DOUBLE] (__getpayloadl): New strong alias.
	* sysdeps/ieee754/dbl-64/wordsize-64/s_roundeven.c (roundeven):
	Rename to __roundeven and define as weak alias.
	[NO_LONG_DOUBLE] (__roundevenl): New strong alias.
	* sysdeps/ieee754/dbl-64/wordsize-64/s_totalorder.c (totalorder):
	Rename to __totalorder and define as weak alias.
	[NO_LONG_DOUBLE] (__totalorderl): New strong alias.
	* sysdeps/ieee754/dbl-64/wordsize-64/s_totalordermag.c
	(totalordermag): Rename to __totalordermag and define as weak
	alias.
	[NO_LONG_DOUBLE] (__totalordermagl): New strong alias.
	* sysdeps/ieee754/float128/float128_private.h (__getpayloadl): New
	macro.
	(__roundevenl): Likewise.
	(__totalorderl): Likewise.
	(__totalordermagl): Likewise
	* sysdeps/ieee754/float128/s_fromfpf128.c (FUNC): Define to
	__fromfpf128.
	(fromfpf128): Define as weak alias.
	* sysdeps/ieee754/float128/s_fromfpxf128.c (FUNC): Define to
	__fromfpxf128.
	(fromfpxf128): Define as weak alias.
	* sysdeps/ieee754/float128/s_setpayloadf128.c (FUNC): Define to
	__setpayloadf128.
	(setpayloadf128): Define as weak alias.
	* sysdeps/ieee754/float128/s_setpayloadsigf128.c (FUNC): Define to
	__setpayloadsigf128.
	(setpayloadsigf128): Define as weak alias.
	* sysdeps/ieee754/float128/s_ufromfpf128.c (FUNC): Define to
	__ufromfpf128.
	(ufromfpf128): Define as weak alias.
	* sysdeps/ieee754/float128/s_ufromfpxf128.c (FUNC): Define to
	__ufromfpxf128.
	(ufromfpxf128): Define as weak alias.
	* sysdeps/ieee754/flt-32/s_fromfpf.c (FUNC): Define to __fromfpf.
	(fromfpf): Define as weak alias.
	* sysdeps/ieee754/flt-32/s_fromfpxf.c (FUNC): Define to
	__fromfpxf.
	(fromfpxf): Define as weak alias.
	* sysdeps/ieee754/flt-32/s_getpayloadf.c (getpayloadf): Rename to
	__getpayloadf and define as weak alias.
	* sysdeps/ieee754/flt-32/s_roundevenf.c (roundevenf): Rename to
	__roundevenf and define as weak alias.
	* sysdeps/ieee754/flt-32/s_setpayloadf.c (FUNC): Define to
	__setpayloadf.
	(setpayloadf): Define as weak alias.
	* sysdeps/ieee754/flt-32/s_setpayloadsigf.c (FUNC): Define to
	__setpayloadsigf.
	(setpayloadsigf): Define as weak alias.
	* sysdeps/ieee754/flt-32/s_totalorderf.c (totalorderf): Rename to
	__totalorderf and define as weak alias.
	* sysdeps/ieee754/flt-32/s_totalordermagf.c (totalordermagf):
	Rename to __totalordermagf and define as weak alias.
	* sysdeps/ieee754/flt-32/s_ufromfpf.c (FUNC): Define to
	__ufromfpf.
	(ufromfpf): Define as weak alias.
	* sysdeps/ieee754/flt-32/s_ufromfpxf.c (FUNC): Define to
	__ufromfpxf.
	(ufromfpxf): Define as weak alias.
	* sysdeps/ieee754/ldbl-128/s_fromfpl.c (FUNC): Define to
	__fromfpl.
	(fromfpl): Define as weak alias.
	* sysdeps/ieee754/ldbl-128/s_fromfpxl.c (FUNC): Define to
	__fromfpxl.
	(fromfpxl): Define as weak alias.
	* sysdeps/ieee754/ldbl-128/s_getpayloadl.c (getpayloadl): Rename
	to __getpayloadl and define as weak alias.
	* sysdeps/ieee754/ldbl-128/s_roundevenl.c (roundevenl): Rename to
	__roundevenl and define as weak alias.
	* sysdeps/ieee754/ldbl-128/s_setpayloadl.c (FUNC): Define to
	__setpayloadl.
	(setpayloadl): Define as weak alias.
	* sysdeps/ieee754/ldbl-128/s_setpayloadsigl.c (FUNC): Define to
	__setpayloadsigl.
	(setpayloadsigl): Define as weak alias.
	* sysdeps/ieee754/ldbl-128/s_totalorderl.c (totalorderl): Rename
	to __totalorderl and define as weak alias.
	* sysdeps/ieee754/ldbl-128/s_totalordermagl.c (totalordermagl):
	Rename to __totalordermagl and define as weak alias.
	* sysdeps/ieee754/ldbl-128/s_ufromfpl.c (FUNC): Define to
	__ufromfpl.
	(ufromfpl): Define as weak alias.
	* sysdeps/ieee754/ldbl-128/s_ufromfpxl.c (FUNC): Define to
	__ufromfpxl.
	(ufromfpxl): Define as weak alias.
	* sysdeps/ieee754/ldbl-128ibm/s_fromfpl.c (FUNC): Define to
	__fromfpl.
	(fromfpl): Define as weak alias.
	* sysdeps/ieee754/ldbl-128ibm/s_fromfpxl.c (FUNC): Define to
	__fromfpxl.
	(fromfpxl): Define as weak alias.
	* sysdeps/ieee754/ldbl-128ibm/s_getpayloadl.c (getpayloadl):
	Rename to __getpayloadl and define as weak alias.
	* sysdeps/ieee754/ldbl-128ibm/s_roundevenl.c (roundevenl): Rename
	to __roundevenl and define as weak alias.  Call __roundeven
	instead of roundeven.
	* sysdeps/ieee754/ldbl-128ibm/s_setpayloadl.c (FUNC): Define to
	__setpayloadl.
	(setpayloadl): Define as weak alias.
	* sysdeps/ieee754/ldbl-128ibm/s_setpayloadsigl.c (FUNC): Define to
	__setpayloadsigl.
	(setpayloadsigl): Define as weak alias.
	* sysdeps/ieee754/ldbl-128ibm/s_totalorderl.c (totalorderl):
	Rename to __totalorderl and define as weak alias.
	* sysdeps/ieee754/ldbl-128ibm/s_totalordermagl.c (totalordermagl):
	Rename to __totalordermagl and define as weak alias.
	* sysdeps/ieee754/ldbl-128ibm/s_ufromfpl.c (FUNC): Define to
	__ufromfpl.
	(ufromfpl): Define as weak alias.
	* sysdeps/ieee754/ldbl-128ibm/s_ufromfpxl.c (FUNC): Define to
	__ufromfpxl.
	(ufromfpxl): Define as weak alias.
	* sysdeps/ieee754/ldbl-96/s_fromfpl.c (FUNC): Define to
	__fromfpl.
	(fromfpl): Define as weak alias.
	* sysdeps/ieee754/ldbl-96/s_fromfpxl.c (FUNC): Define to
	__fromfpxl.
	(fromfpxl): Define as weak alias.
	* sysdeps/ieee754/ldbl-96/s_getpayloadl.c (getpayloadl): Rename to
	__getpayloadl and define as weak alias.
	* sysdeps/ieee754/ldbl-96/s_roundevenl.c (roundevenl): Rename to
	__roundevenl and define as weak alias.
	* sysdeps/ieee754/ldbl-96/s_setpayloadl.c (FUNC): Define to
	__setpayloadl.
	(setpayloadl): Define as weak alias.
	* sysdeps/ieee754/ldbl-96/s_setpayloadsigl.c (FUNC): Define to
	__setpayloadsigl.
	(setpayloadsigl): Define as weak alias.
	* sysdeps/ieee754/ldbl-96/s_totalorderl.c (totalorderl): Rename to
	__totalorderl and define as weak alias.
	* sysdeps/ieee754/ldbl-96/s_totalordermagl.c (totalordermagl):
	Rename to __totalordermagl and define as weak alias.
	* sysdeps/ieee754/ldbl-96/s_ufromfpl.c (FUNC): Define to
	__ufromfpl.
	(ufromfpl): Define as weak alias.
	* sysdeps/ieee754/ldbl-96/s_ufromfpxl.c (FUNC): Define to
	__ufromfpxl.
	(ufromfpxl): Define as weak alias.

6 files changed, 36 insertions, 18 deletions

diff --git a/math/w_j0_compat.c b/math/w_j0_compat.c
index 3df71e0b7b..b08688e131 100644
--- a/math/w_j0_compat.c
+++ b/math/w_j0_compat.c
@@ -25,7 +25,7 @@
 #if LIBM_SVID_COMPAT
 /* wrapper j0 */
 double
-j0 (double x)
+__j0 (double x)
 {
   if (__builtin_expect (isgreater (fabs (x), X_TLOSS), 0)
       && _LIB_VERSION != _IEEE_ && _LIB_VERSION != _POSIX_)
@@ -34,14 +34,16 @@ j0 (double x)
 
   return __ieee754_j0 (x);
 }
+weak_alias (__j0, j0)
 # ifdef NO_LONG_DOUBLE
-weak_alias (j0, j0l)
+strong_alias (__j0, __j0l)
+weak_alias (__j0, j0l)
 # endif
 
 
 /* wrapper y0 */
 double
-y0 (double x)
+__y0 (double x)
 {
   if (__builtin_expect (islessequal (x, 0.0) || isgreater (x, X_TLOSS), 0)
       && _LIB_VERSION != _IEEE_)
@@ -65,7 +67,9 @@ y0 (double x)
 
   return __ieee754_y0 (x);
 }
+weak_alias (__y0, y0)
 # ifdef NO_LONG_DOUBLE
-weak_alias (y0, y0l)
+strong_alias (__y0, __y0l)
+weak_alias (__y0, y0l)
 # endif
 #endif
diff --git a/math/w_j0f_compat.c b/math/w_j0f_compat.c
index e9ac74f23a..0ef4179bfa 100644
--- a/math/w_j0f_compat.c
+++ b/math/w_j0f_compat.c
@@ -25,7 +25,7 @@
 #if LIBM_SVID_COMPAT
 /* wrapper j0f */
 float
-j0f (float x)
+__j0f (float x)
 {
   if (__builtin_expect (isgreater (fabsf (x), (float) X_TLOSS), 0)
       && _LIB_VERSION != _IEEE_ && _LIB_VERSION != _POSIX_)
@@ -34,11 +34,12 @@ j0f (float x)
 
   return __ieee754_j0f (x);
 }
+weak_alias (__j0f, j0f)
 
 
 /* wrapper y0f */
 float
-y0f (float x)
+__y0f (float x)
 {
   if (__builtin_expect (islessequal (x, 0.0f)
                         || isgreater (x, (float) X_TLOSS), 0)
@@ -63,4 +64,5 @@ y0f (float x)
 
   return __ieee754_y0f (x);
 }
+weak_alias (__y0f, y0f)
 #endif
diff --git a/math/w_j1_compat.c b/math/w_j1_compat.c
index be788f9864..bf0922d588 100644
--- a/math/w_j1_compat.c
+++ b/math/w_j1_compat.c
@@ -25,7 +25,7 @@
 #if LIBM_SVID_COMPAT
 /* wrapper j1 */
 double
-j1 (double x)
+__j1 (double x)
 {
   if (__builtin_expect (isgreater (fabs (x), X_TLOSS), 0)
       && _LIB_VERSION != _IEEE_ && _LIB_VERSION != _POSIX_)
@@ -34,14 +34,16 @@ j1 (double x)
 
   return __ieee754_j1 (x);
 }
+weak_alias (__j1, j1)
 # ifdef NO_LONG_DOUBLE
-weak_alias (j1, j1l)
+strong_alias (__j1, __j1l)
+weak_alias (__j1, j1l)
 # endif
 
 
 /* wrapper y1 */
 double
-y1 (double x)
+__y1 (double x)
 {
   if (__builtin_expect (islessequal (x, 0.0) || isgreater (x, X_TLOSS), 0)
       && _LIB_VERSION != _IEEE_)
@@ -65,7 +67,9 @@ y1 (double x)
 
   return __ieee754_y1 (x);
 }
+weak_alias (__y1, y1)
 # ifdef NO_LONG_DOUBLE
-weak_alias (y1, y1l)
+strong_alias (__y1, __y1l)
+weak_alias (__y1, y1l)
 # endif
 #endif
diff --git a/math/w_j1f_compat.c b/math/w_j1f_compat.c
index c3222bbc8d..d44fb12437 100644
--- a/math/w_j1f_compat.c
+++ b/math/w_j1f_compat.c
@@ -25,7 +25,7 @@
 #if LIBM_SVID_COMPAT
 /* wrapper j1f */
 float
-j1f (float x)
+__j1f (float x)
 {
   if (__builtin_expect (isgreater (fabsf (x), X_TLOSS), 0)
       && _LIB_VERSION != _IEEE_ && _LIB_VERSION != _POSIX_)
@@ -34,11 +34,12 @@ j1f (float x)
 
   return __ieee754_j1f (x);
 }
+weak_alias (__j1f, j1f)
 
 
 /* wrapper y1f */
 float
-y1f (float x)
+__y1f (float x)
 {
   if (__builtin_expect (islessequal (x, 0.0f)
 			|| isgreater (x, (float) X_TLOSS), 0)
@@ -63,4 +64,5 @@ y1f (float x)
 
   return __ieee754_y1f (x);
 }
+weak_alias (__y1f, y1f)
 #endif
diff --git a/math/w_jn_compat.c b/math/w_jn_compat.c
index 496c779e8c..955996a2e6 100644
--- a/math/w_jn_compat.c
+++ b/math/w_jn_compat.c
@@ -25,7 +25,7 @@
 #if LIBM_SVID_COMPAT
 /* wrapper jn */
 double
-jn (int n, double x)
+__jn (int n, double x)
 {
   if (__builtin_expect (isgreater (fabs (x), X_TLOSS), 0)
       && _LIB_VERSION != _IEEE_ && _LIB_VERSION != _POSIX_)
@@ -34,14 +34,16 @@ jn (int n, double x)
 
   return __ieee754_jn (n, x);
 }
+weak_alias (__jn, jn)
 # ifdef NO_LONG_DOUBLE
-weak_alias (jn, jnl)
+strong_alias (__jn, __jnl)
+weak_alias (__jn, jnl)
 # endif
 
 
 /* wrapper yn */
 double
-yn (int n, double x)
+__yn (int n, double x)
 {
   if (__builtin_expect (islessequal (x, 0.0) || isgreater (x, X_TLOSS), 0)
       && _LIB_VERSION != _IEEE_)
@@ -65,7 +67,9 @@ yn (int n, double x)
 
   return __ieee754_yn (n, x);
 }
+weak_alias (__yn, yn)
 # ifdef NO_LONG_DOUBLE
-weak_alias (yn, ynl)
+strong_alias (__yn, __ynl)
+weak_alias (__yn, ynl)
 # endif
 #endif
diff --git a/math/w_jnf_compat.c b/math/w_jnf_compat.c
index 440d53d13e..b2b416182b 100644
--- a/math/w_jnf_compat.c
+++ b/math/w_jnf_compat.c
@@ -25,7 +25,7 @@
 #if LIBM_SVID_COMPAT
 /* wrapper jnf */
 float
-jnf (int n, float x)
+__jnf (int n, float x)
 {
   if (__builtin_expect (isgreater (fabsf (x), (float) X_TLOSS), 0)
       && _LIB_VERSION != _IEEE_ && _LIB_VERSION != _POSIX_)
@@ -34,11 +34,12 @@ jnf (int n, float x)
 
   return __ieee754_jnf (n, x);
 }
+weak_alias (__jnf, jnf)
 
 
 /* wrapper ynf */
 float
-ynf (int n, float x)
+__ynf (int n, float x)
 {
   if (__builtin_expect (islessequal (x, 0.0f)
 			|| isgreater (x, (float) X_TLOSS), 0)
@@ -63,4 +64,5 @@ ynf (int n, float x)
 
   return __ieee754_ynf (n, x);
 }
+weak_alias (__ynf, ynf)
 #endif