[glibc] Don't provide scalb/significand _FloatN aliases [BZ #31760]

[glibc] Don't provide scalb/significand _FloatN aliases [BZ #31760]

[H.J. Lu]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a34f76edbda8a0b143111e670ca33c97623bfe56

commit a34f76edbda8a0b143111e670ca33c97623bfe56
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon May 20 09:56:36 2024 -0700

    Don't provide scalb/significand _FloatN aliases [BZ #31760]
    
    scalb is a deprecated interface which was obsolescent in POSIX.1-2001,
    removed in POSIX.1-2008, never made to C standard.  significant was
    originally from BSD and never made in any standard.  Fix BZ #31760 by
    not providing _FloatN aliases for them.
    
    Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
    Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

Diff:
---
 math/s_significand_template.c | 12 ++++++++++++
 math/w_scalb_template.c       | 12 ++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/math/s_significand_template.c b/math/s_significand_template.c
index a351390411..0c8a1c3d75 100644
--- a/math/s_significand_template.c
+++ b/math/s_significand_template.c
@@ -30,4 +30,16 @@ M_DECL_FUNC (__significand) (FLOAT x)
 {
   return M_SUF (__ieee754_scalb) (x,(FLOAT) - M_SUF (__ilogb) (x));
 }
+
+/* Don't provide _FloatN aliases for significand which was originally
+   from BSD and never made in any standard.  */
+#undef libm_alias_float_other_r
+#define libm_alias_float_other_r(from, to, r)
+#undef libm_alias_double_other_r
+#define libm_alias_double_other_r(from, to, r)
+#undef libm_alias_ldouble_other_r
+#define libm_alias_ldouble_other_r(from, to, r)
+#undef libm_alias_float128_other_r
+#define libm_alias_float128_other_r(from, to, r)
+
 declare_mgen_alias (__significand, significand)
diff --git a/math/w_scalb_template.c b/math/w_scalb_template.c
index 2fd5ca1878..f9f98508e9 100644
--- a/math/w_scalb_template.c
+++ b/math/w_scalb_template.c
@@ -52,6 +52,18 @@ FLOAT M_DECL_FUNC (__scalb) (FLOAT x, FLOAT fn)
   return z;
 }
 
+/* Don't provide _FloatN aliases for scalb which is a deprecated interface,
+   was obsolescent in POSIX.1-2001, removed in POSIX.1-2008, never made to
+   C standard.  */
+#undef libm_alias_float_other_r
+#define libm_alias_float_other_r(from, to, r)
+#undef libm_alias_double_other_r
+#define libm_alias_double_other_r(from, to, r)
+#undef libm_alias_ldouble_other_r
+#define libm_alias_ldouble_other_r(from, to, r)
+#undef libm_alias_float128_other_r
+#define libm_alias_float128_other_r(from, to, r)
+
 declare_mgen_alias (__scalb, scalb);
 
 #endif /* __USE_WRAPPER_TEMPLATE.  */