float128: Add strfromf128

Add strfromf128 to stdlib when _Float128 support is enabled.

	* stdio-common/printf-parsemb.c (__parse_one_specmb): Initialize
	spec->info.is_binary128 to zero.
	* stdio-common/printf.h (printf_info): Add new member is_binary128
	to indicate that the number being converted to string is compatible
	with the IEC 60559 binary128 format.
	* stdio-common/printf_fp.c (__printf_fp_l): Add code to deal with
	_Float128 numbers.
	* stdio-common/printf_fphex.c: Include ieee754_float128.h and
	ldbl-128/printf_fphex_macros.h
	(__printf_fphex): Add code to deal with _Float128 numbers.
	* stdio-common/printf_size.c (__printf_size): Likewise.
	* stdio-common/vfprintf.c (process_arg): Initialize member
	info.is_binary128 to zero.
	* stdlib/fpioconst.h (FLT128_MAX_10_EXP_LOG): New macro.
	* stdlib/stdlib.h: Include bits/floatn.h for _Float128 support.
	(strfromf128): New declaration.
	* stdlib/strfrom-skeleton.c (STRFROM): Set member info.is_binary128
	to one.
	* sysdeps/ieee754/float128/Makefile: Add strfromf128.
	* sysdeps/ieee754/float128/Versions: Likewise.
	* sysdeps/ieee754/float128/strfromf128.c: New file.

1 files changed, 6 insertions, 0 deletions

diff --git a/stdlib/strfrom-skeleton.c b/stdlib/strfrom-skeleton.c
index 811a29c7d3..5841919fe4 100644
--- a/stdlib/strfrom-skeleton.c
+++ b/stdlib/strfrom-skeleton.c
@@ -132,6 +132,12 @@ STRFROM (char *dest, size_t size, const char *format, FLOAT f)
      which type of floating-point number is being passed.  */
   info.is_long_double = __builtin_types_compatible_p (FLOAT, long double);
 
+  /* Similarly, the function strfromf128 passes a floating-point number in
+     _Float128 format to printf_fp.  */
+#if __HAVE_DISTINCT_FLOAT128
+  info.is_binary128 = __builtin_types_compatible_p (FLOAT, _Float128);
+#endif
+
   /* Set info according to the format string.  */
   info.prec = precision;
   info.spec = specifier;