ldbl-128ibm-compat: PLT redirects for using ldbl redirects internally

Tweak the PLT bypass magic when building glibc with long double
redirects.  This is made more difficult by the fact we only get
one chance to redirect functions.  This happens via the public
headers.

There are roughly three classes of redirect we need to attend to
today:

 1. Simple redirects, redirected via cdef macro overrides and
    and new libc_hidden_ldbl_proto macro.
 2. Internal usage of internal API, e.g __snprintf, which has
    no direct analogue.  This is bypassed directly on case-by-
    case basis.
 3. Double redirects, e.g sscanf and related.  These require
    a heavier handed approach of macro renaming to existing
    symbols.

Most simple redirects are handled via 1.  Ideally, the libc_*
macro would live in libc-symbols.h, but in practice the macros
needed for it to do anything useful live in cdefs.h, so they
are defined in the local override.

Notably, the internal name of the asprintf generated for ieee ldbl
redirects is renamed to work with internal prefixed usage.

This resolves the local plt usage introduced when building glibc
with ldbl == ieee128 on ppc64le.

Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>

11 files changed, 20 insertions, 3 deletions

diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-asprintf.c b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-asprintf.c
index 68cafbb..2a6ed2f 100644
--- a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-asprintf.c
+++ b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-asprintf.c
@@ -20,7 +20,7 @@
 #include <libio/libioP.h>
 
 extern int
-___ieee128_asprintf (char **string_ptr, const char *format, ...)
+___ieee128___asprintf (char **string_ptr, const char *format, ...)
 {
   va_list ap;
   int done;
@@ -32,4 +32,5 @@ ___ieee128_asprintf (char **string_ptr, const char *format, ...)
 
   return done;
 }
-strong_alias (___ieee128_asprintf, __asprintfieee128)
+hidden_def (___ieee128___asprintf)
+strong_alias (___ieee128___asprintf, __asprintfieee128)
diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-dprintf.c b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-dprintf.c
index 9dc6530..87440c9 100644
--- a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-dprintf.c
+++ b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-dprintf.c
@@ -32,3 +32,4 @@ ___ieee128_dprintf (int d, const char *format, ...)
   return done;
 }
 strong_alias (___ieee128_dprintf, __dprintfieee128)
+hidden_def (___ieee128_dprintf);
diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-err.c b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-err.c
index eae071b..f81d3ed 100644
--- a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-err.c
+++ b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-err.c
@@ -91,3 +91,10 @@ IEEE128_DECL (errx) (int status, const char *format, ...)
   VA (verrx (status, format, ap))
 }
 IEEE128_ALIAS (errx)
+
+hidden_def (___ieee128_warn)
+hidden_def (___ieee128_warnx)
+hidden_def (___ieee128_vwarn)
+hidden_def (___ieee128_vwarnx)
+hidden_def (___ieee128_verr)
+hidden_def (___ieee128_verrx)
diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-fprintf.c b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-fprintf.c
index e1c9896..b05e6f1 100644
--- a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-fprintf.c
+++ b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-fprintf.c
@@ -32,3 +32,4 @@ ___ieee128_fprintf (FILE *fp, const char *format, ...)
   return done;
 }
 strong_alias (___ieee128_fprintf, __fprintfieee128)
+hidden_def (___ieee128_fprintf)
diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc99_sscanf.c b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc99_sscanf.c
index bfc7270..cd1c9fa 100644
--- a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc99_sscanf.c
+++ b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc99_sscanf.c
@@ -37,3 +37,4 @@ ___ieee128_isoc99_sscanf (const char *string, const char *format, ...)
   return done;
 }
 strong_alias (___ieee128_isoc99_sscanf, __isoc99_sscanfieee128)
+hidden_def (___ieee128_isoc99_sscanf)
diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc99_vfscanf.c b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc99_vfscanf.c
index b561fa3..2a11f49 100644
--- a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc99_vfscanf.c
+++ b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc99_vfscanf.c
@@ -17,6 +17,7 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <libio/libioP.h>
+#include <stdio.h>
 
 extern int
 ___ieee128_isoc99_vfscanf (FILE *fp, const char *format, va_list ap)
@@ -25,3 +26,4 @@ ___ieee128_isoc99_vfscanf (FILE *fp, const char *format, va_list ap)
   return __vfscanf_internal (fp, format, ap, mode_flags);
 }
 strong_alias (___ieee128_isoc99_vfscanf, __isoc99_vfscanfieee128)
+hidden_def (___ieee128_isoc99_vfscanf)
diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc99_vsscanf.c b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc99_vsscanf.c
index bef6ebc..d976cdb 100644
--- a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc99_vsscanf.c
+++ b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc99_vsscanf.c
@@ -28,3 +28,4 @@ ___ieee128_isoc99_vsscanf (const char *string, const char *format, va_list ap)
   return __vfscanf_internal (fp, format, ap, mode_flags);
 }
 strong_alias (___ieee128_isoc99_vsscanf, __isoc99_vsscanfieee128)
+hidden_def (___ieee128_isoc99_vsscanf)
diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-sprintf.c b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-sprintf.c
index 52088cd..690dc3a 100644
--- a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-sprintf.c
+++ b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-sprintf.c
@@ -33,3 +33,4 @@ ___ieee128_sprintf (char *s, const char *format, ...)
   return done;
 }
 strong_alias (___ieee128_sprintf, __sprintfieee128)
+hidden_def (___ieee128_sprintf)
diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-syslog.c b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-syslog.c
index 914f24a..4af5463 100644
--- a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-syslog.c
+++ b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-syslog.c
@@ -30,6 +30,7 @@ ___ieee128_syslog (int pri, const char *fmt, ...)
   va_end (ap);
 }
 strong_alias (___ieee128_syslog, __syslogieee128)
+hidden_def (___ieee128_syslog)
 
 void
 ___ieee128_vsyslog (int pri, const char *fmt, va_list ap)
diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-vfprintf.c b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-vfprintf.c
index 234cd9d..b407eae 100644
--- a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-vfprintf.c
+++ b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-vfprintf.c
@@ -24,3 +24,4 @@ ___ieee128_vfprintf (FILE *fp, const char *format, va_list ap)
   return __vfprintf_internal (fp, format, ap, PRINTF_LDBL_USES_FLOAT128);
 }
 strong_alias (___ieee128_vfprintf, __vfprintfieee128)
+hidden_def (___ieee128_vfprintf)
diff --git a/sysdeps/ieee754/ldbl-128ibm/include/bits/iscanonical.h b/sysdeps/ieee754/ldbl-128ibm/include/bits/iscanonical.h
index bee080b..8cbd6f7 100644
--- a/sysdeps/ieee754/ldbl-128ibm/include/bits/iscanonical.h
+++ b/sysdeps/ieee754/ldbl-128ibm/include/bits/iscanonical.h
@@ -1,5 +1,5 @@
 #include_next <bits/iscanonical.h>
 
-#ifndef _ISOMAC
+#if !defined _ISOMAC && (__LONG_DOUBLE_USES_FLOAT128 == 0)
 libm_hidden_proto (__iscanonicall)
 #endif