[glibc/gabriel/powerpc-ieee128-printscan] Avoid compat symbols for totalorder in powerpc64le IEEE long double

[Gabriel F.T.Gomes <gftg@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=5b4ba3c1d5aa96261e401d3616bb99004838a636

commit 5b4ba3c1d5aa96261e401d3616bb99004838a636
Author: Gabriel F. T. Gomes <gabrielftg@linux.ibm.com>
Date:   Mon Sep 9 12:59:46 2019 -0500

    Avoid compat symbols for totalorder in powerpc64le IEEE long double
    
    No changes since v3.
    
    No changes since v2.
    
    Changes since v1:
    
      - Added comment on the redefinition of libm_alias_float128_other_r_ldbl.
    
    -- 8< --
    On powerpc64le, the libm_alias_float128_other_r_ldbl macro is
    used to create an alias between totalorderf128 and __totalorderlieee128,
    as well as between the totalordermagf128 and __totalordermaglieee128.
    
    However, the totalorder* and totalordermag* functions changed their
    parameter type since commit ID 42760d764649 and got compat symbols for
    their old versions.  With this change, the aforementioned macro would
    create two conflicting aliases for __totalorderlieee128 and
    __totalordermaglieee128.
    
    This patch avoids the creation of the alias between the IEEE long double
    symbols (__totalorderl*ieee128) and the compat symbols, because the IEEE
    long double functions have never been exported thus don't need such
    compat symbol.
    
    Tested for powerpc64le.
    
    Reviewed-by: Joseph Myers <joseph@codesourcery.com>

Diff:
---
 sysdeps/ieee754/ldbl-128/s_totalorderl.c    | 9 +++++++++
 sysdeps/ieee754/ldbl-128/s_totalordermagl.c | 9 +++++++++
 2 files changed, 18 insertions(+)

diff --git a/sysdeps/ieee754/ldbl-128/s_totalorderl.c b/sysdeps/ieee754/ldbl-128/s_totalorderl.c
index 098bd2b..f9db06c 100644
--- a/sysdeps/ieee754/ldbl-128/s_totalorderl.c
+++ b/sysdeps/ieee754/ldbl-128/s_totalorderl.c
@@ -74,6 +74,15 @@ __totalorder_compatl (_Float128 x, _Float128 y)
 {
   return __totalorderl (&x, &y);
 }
+/* On platforms that reuse the _Float128 implementation for IEEE long
+   double (powerpc64le), the libm_alias_float128_other_r_ldbl macro
+   (which is called by the libm_alias_ldouble macro) is used to create
+   aliases between *f128 (_Float128 API) and __*ieee128 functions.
+   However, this compat version of totalorderl is older than the
+   availability of __ieee*128 symbols, thus, the compat alias is not
+   required, nor desired.  */
+#undef libm_alias_float128_other_r_ldbl
+#define libm_alias_float128_other_r_ldbl(from, to, r)
 #undef do_symbol
 #define do_symbol(orig_name, name, aliasname)			\
   strong_alias (orig_name, name)				\
diff --git a/sysdeps/ieee754/ldbl-128/s_totalordermagl.c b/sysdeps/ieee754/ldbl-128/s_totalordermagl.c
index b31788c..45b17ed 100644
--- a/sysdeps/ieee754/ldbl-128/s_totalordermagl.c
+++ b/sysdeps/ieee754/ldbl-128/s_totalordermagl.c
@@ -68,6 +68,15 @@ __totalordermag_compatl (_Float128 x, _Float128 y)
 {
   return __totalordermagl (&x, &y);
 }
+/* On platforms that reuse the _Float128 implementation for IEEE long
+   double (powerpc64le), the libm_alias_float128_other_r_ldbl macro
+   (which is called by the libm_alias_ldouble macro) is used to create
+   aliases between *f128 (_Float128 API) and __*ieee128 functions.
+   However, this compat version of totalordermagl is older than the
+   availability of __ieee*128 symbols, thus, the compat alias is not
+   required, nor desired.  */
+#undef libm_alias_float128_other_r_ldbl
+#define libm_alias_float128_other_r_ldbl(from, to, r)
 #undef do_symbol
 #define do_symbol(orig_name, name, aliasname)			\
   strong_alias (orig_name, name)				\