RFC: powerpc64le: Enable support for IEEE long double gabriel/powerpc-ieee128-printscan

Not for glibc-2.31 - Do not commit!

No changes since v3.

Changes since v2:

  - Added definition of LDBL_IBM128_COMPAT_VERSION and
    LDBL_IBM128_VERSION (moved from a previous commit).

Changes since v1:

  - Use __LONG_DOUBLE_USES_FLOAT128 directly.

-- 8< --
On platforms where long double may have two different formats, i.e.: the
same format as double (64-bits) or something else (128-bits), building
with -mlong-double-128 is the default and function calls in the user
program match the name of the function in Glibc.  When building with
-mlong-double-64, Glibc installed headers redirect such calls to the
appropriate function.

This patch adds similar redirections to be used by user code builds in
IEEE long double mode (-mabi=ieeelongdouble).  It also skips some uses
of libc_hidden_proto in internal headers, because they also produce
redirections, causing a redirection conflict.

PS: Missing NEWS entry.

1 files changed, 31 insertions, 15 deletions

diff --git a/libio/bits/stdio-ldbl.h b/libio/bits/stdio-ldbl.h
index 2f01a98384..6b90433616 100644
--- a/libio/bits/stdio-ldbl.h
+++ b/libio/bits/stdio-ldbl.h
@@ -27,9 +27,17 @@ __LDBL_REDIR_DECL (vfprintf)
 __LDBL_REDIR_DECL (vprintf)
 __LDBL_REDIR_DECL (vsprintf)
 #if !__GLIBC_USE (DEPRECATED_SCANF)
+# if defined __LDBL_COMPAT
 __LDBL_REDIR1_DECL (fscanf, __nldbl___isoc99_fscanf)
 __LDBL_REDIR1_DECL (scanf, __nldbl___isoc99_scanf)
 __LDBL_REDIR1_DECL (sscanf, __nldbl___isoc99_sscanf)
+# elif __LONG_DOUBLE_USES_FLOAT128 == 1
+__LDBL_REDIR1_DECL (fscanf, __isoc99_fscanfieee128)
+__LDBL_REDIR1_DECL (scanf, __isoc99_scanfieee128)
+__LDBL_REDIR1_DECL (sscanf, __isoc99_sscanfieee128)
+# else
+#  error bits/stdlib-ldbl.h included when no ldbl redirections are required.
+# endif
 #else
 __LDBL_REDIR_DECL (fscanf)
 __LDBL_REDIR_DECL (scanf)
@@ -43,9 +51,17 @@ __LDBL_REDIR_DECL (vsnprintf)
 
 #ifdef	__USE_ISOC99
 # if !__GLIBC_USE (DEPRECATED_SCANF)
+#  if defined __LDBL_COMPAT
 __LDBL_REDIR1_DECL (vfscanf, __nldbl___isoc99_vfscanf)
 __LDBL_REDIR1_DECL (vscanf, __nldbl___isoc99_vscanf)
 __LDBL_REDIR1_DECL (vsscanf, __nldbl___isoc99_vsscanf)
+#  elif __LONG_DOUBLE_USES_FLOAT128 == 1
+__LDBL_REDIR1_DECL (vfscanf, __isoc99_vfscanfieee128)
+__LDBL_REDIR1_DECL (vscanf, __isoc99_vscanfieee128)
+__LDBL_REDIR1_DECL (vsscanf, __isoc99_vsscanfieee128)
+#  else
+#   error bits/stdlib-ldbl.h included when no ldbl redirections are required.
+#  endif
 # else
 __LDBL_REDIR_DECL (vfscanf)
 __LDBL_REDIR_DECL (vsscanf)
@@ -60,33 +76,33 @@ __LDBL_REDIR_DECL (dprintf)
 
 #ifdef __USE_GNU
 __LDBL_REDIR_DECL (vasprintf)
-__LDBL_REDIR_DECL (__asprintf)
+__LDBL_REDIR2_DECL (asprintf)
 __LDBL_REDIR_DECL (asprintf)
 __LDBL_REDIR_DECL (obstack_printf)
 __LDBL_REDIR_DECL (obstack_vprintf)
 #endif
 
 #if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function
-__LDBL_REDIR_DECL (__sprintf_chk)
-__LDBL_REDIR_DECL (__vsprintf_chk)
+__LDBL_REDIR2_DECL (sprintf_chk)
+__LDBL_REDIR2_DECL (vsprintf_chk)
 # if defined __USE_ISOC99 || defined __USE_UNIX98
-__LDBL_REDIR_DECL (__snprintf_chk)
-__LDBL_REDIR_DECL (__vsnprintf_chk)
+__LDBL_REDIR2_DECL (snprintf_chk)
+__LDBL_REDIR2_DECL (vsnprintf_chk)
 # endif
 # if __USE_FORTIFY_LEVEL > 1
-__LDBL_REDIR_DECL (__fprintf_chk)
-__LDBL_REDIR_DECL (__printf_chk)
-__LDBL_REDIR_DECL (__vfprintf_chk)
-__LDBL_REDIR_DECL (__vprintf_chk)
+__LDBL_REDIR2_DECL (fprintf_chk)
+__LDBL_REDIR2_DECL (printf_chk)
+__LDBL_REDIR2_DECL (vfprintf_chk)
+__LDBL_REDIR2_DECL (vprintf_chk)
 #  ifdef __USE_XOPEN2K8
-__LDBL_REDIR_DECL (__dprintf_chk)
-__LDBL_REDIR_DECL (__vdprintf_chk)
+__LDBL_REDIR2_DECL (dprintf_chk)
+__LDBL_REDIR2_DECL (vdprintf_chk)
 #  endif
 #  ifdef __USE_GNU
-__LDBL_REDIR_DECL (__asprintf_chk)
-__LDBL_REDIR_DECL (__vasprintf_chk)
-__LDBL_REDIR_DECL (__obstack_printf_chk)
-__LDBL_REDIR_DECL (__obstack_vprintf_chk)
+__LDBL_REDIR2_DECL (asprintf_chk)
+__LDBL_REDIR2_DECL (vasprintf_chk)
+__LDBL_REDIR2_DECL (obstack_printf_chk)
+__LDBL_REDIR2_DECL (obstack_vprintf_chk)
 #  endif
 # endif
 #endif