Support strtof128 etc. aliases.

This patch adds support for building strtof128, wcstof128, strtof128_l
and wcstof128_l as aliases, in the case of __HAVE_FLOAT128 &&
!__HAVE_DISTINCT_FLOAT128.

Tested with build-many-glibcs.py that installed stripped shared
libraries are unchanged by this patch.  Also tested together with
changes to enable float128 aliases.

	* stdlib/strtold.c: Include <bits/floatn.h>
	[__HAVE_FLOAT128 && !__HAVE_DISTINCT_FLOAT128] (strtof128): Define
	and later undefine as macro.  Define as weak alias if
	[!USE_WIDE_CHAR].
	[__HAVE_FLOAT128 && !__HAVE_DISTINCT_FLOAT128] (wcstof128): Define
	and later undefine as macro.  Define as weak alias if
	[USE_WIDE_CHAR].
	* sysdeps/ieee754/ldbl-128/strtold_l.c [__HAVE_FLOAT128 &&
	!__HAVE_DISTINCT_FLOAT128] (strtof128_l): Define and later
	undefine as macro.  Define as weak alias if [!USE_WIDE_CHAR].
	[__HAVE_FLOAT128 && !__HAVE_DISTINCT_FLOAT128] (wcstof128_l):
	Define and later undefine as macro.  Define as weak alias if
	[USE_WIDE_CHAR].
	* sysdeps/ieee754/ldbl-64-128/strtold_l.c: Include
	<bits/floatn.h>.
	[__HAVE_FLOAT128 && !__HAVE_DISTINCT_FLOAT128] (strtof128_l):
	Define and later undefine as macro.  Define as weak alias if
	[!USE_WIDE_CHAR].
	[__HAVE_FLOAT128 && !__HAVE_DISTINCT_FLOAT128] (wcstof128_l):
	Define and later undefine as macro.  Define as weak alias if
	[USE_WIDE_CHAR].

4 files changed, 72 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 1f90c43a32..52ea0d96aa 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,27 @@
+2017-10-16  Joseph Myers  <joseph@codesourcery.com>
+
+	* stdlib/strtold.c: Include <bits/floatn.h>
+	[__HAVE_FLOAT128 && !__HAVE_DISTINCT_FLOAT128] (strtof128): Define
+	and later undefine as macro.  Define as weak alias if
+	[!USE_WIDE_CHAR].
+	[__HAVE_FLOAT128 && !__HAVE_DISTINCT_FLOAT128] (wcstof128): Define
+	and later undefine as macro.  Define as weak alias if
+	[USE_WIDE_CHAR].
+	* sysdeps/ieee754/ldbl-128/strtold_l.c [__HAVE_FLOAT128 &&
+	!__HAVE_DISTINCT_FLOAT128] (strtof128_l): Define and later
+	undefine as macro.  Define as weak alias if [!USE_WIDE_CHAR].
+	[__HAVE_FLOAT128 && !__HAVE_DISTINCT_FLOAT128] (wcstof128_l):
+	Define and later undefine as macro.  Define as weak alias if
+	[USE_WIDE_CHAR].
+	* sysdeps/ieee754/ldbl-64-128/strtold_l.c: Include
+	<bits/floatn.h>.
+	[__HAVE_FLOAT128 && !__HAVE_DISTINCT_FLOAT128] (strtof128_l):
+	Define and later undefine as macro.  Define as weak alias if
+	[!USE_WIDE_CHAR].
+	[__HAVE_FLOAT128 && !__HAVE_DISTINCT_FLOAT128] (wcstof128_l):
+	Define and later undefine as macro.  Define as weak alias if
+	[USE_WIDE_CHAR].
+
 2017-10-15  Carlos O'Donell  <carlos@redhat.com>
 
 	* localedata/collate-test.c (allocate_arrays): Don't use \n in
diff --git a/stdlib/strtold.c b/stdlib/strtold.c
index e4ace02dd0..4e683b44b6 100644
--- a/stdlib/strtold.c
+++ b/stdlib/strtold.c
@@ -20,8 +20,14 @@
 /* The actual implementation for all floating point sizes is in strtod.c.
    These macros tell it to produce the `float' version, `strtof'.  */
 
+#include <bits/floatn.h>
 #include <bits/long-double.h>
 
+#if __HAVE_FLOAT128 && !__HAVE_DISTINCT_FLOAT128
+# define strtof128 __hide_strtof128
+# define wcstof128 __hide_wcstof128
+#endif
+
 #ifdef __LONG_DOUBLE_MATH_OPTIONAL
 # include <wchar.h>
 # define NEW(x) NEW1(x)
@@ -62,3 +68,13 @@ long_double_symbol (libc, ____new_strtold_internal, __strtold_internal);
 libc_hidden_ver (____new_strtold_internal, __strtold_internal)
 # endif
 #endif
+
+#if __HAVE_FLOAT128 && !__HAVE_DISTINCT_FLOAT128
+# undef strtof128
+# undef wcstof128
+# ifdef USE_WIDE_CHAR
+weak_alias (NEW (wcstold), wcstof128)
+# else
+weak_alias (NEW (strtold), strtof128)
+# endif
+#endif
diff --git a/sysdeps/ieee754/ldbl-128/strtold_l.c b/sysdeps/ieee754/ldbl-128/strtold_l.c
index 4a8b14c4bb..ea5c91919a 100644
--- a/sysdeps/ieee754/ldbl-128/strtold_l.c
+++ b/sysdeps/ieee754/ldbl-128/strtold_l.c
@@ -34,4 +34,19 @@
 #define MPN2FLOAT	__mpn_construct_long_double
 #define FLOAT_HUGE_VAL	HUGE_VALL
 
+#if __HAVE_FLOAT128 && !__HAVE_DISTINCT_FLOAT128
+# define strtof128_l __hide_strtof128_l
+# define wcstof128_l __hide_wcstof128_l
+#endif
+
 #include <strtod_l.c>
+
+#if __HAVE_FLOAT128 && !__HAVE_DISTINCT_FLOAT128
+# undef strtof128_l
+# undef wcstof128_l
+# ifdef USE_WIDE_CHAR
+weak_alias (wcstold_l, wcstof128_l)
+# else
+weak_alias (strtold_l, strtof128_l)
+# endif
+#endif
diff --git a/sysdeps/ieee754/ldbl-64-128/strtold_l.c b/sysdeps/ieee754/ldbl-64-128/strtold_l.c
index b12151d579..f6f717172c 100644
--- a/sysdeps/ieee754/ldbl-64-128/strtold_l.c
+++ b/sysdeps/ieee754/ldbl-64-128/strtold_l.c
@@ -15,6 +15,13 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+#include <bits/floatn.h>
+
+#if __HAVE_FLOAT128 && !__HAVE_DISTINCT_FLOAT128
+# define strtof128_l __hide_strtof128_l
+# define wcstof128_l __hide_wcstof128_l
+#endif
+
 #include <math.h>
 #include <stdlib.h>
 #include <wchar.h>
@@ -57,3 +64,13 @@ long_double_symbol (libc, ___new_strtold_l, strtold_l);
 long_double_symbol (libc, ____new_strtold_l, __strtold_l);
 # endif
 #endif
+
+#if __HAVE_FLOAT128 && !__HAVE_DISTINCT_FLOAT128
+# undef strtof128_l
+# undef wcstof128_l
+# ifdef USE_WIDE_CHAR
+weak_alias (____new_wcstold_l, wcstof128_l)
+# else
+weak_alias (____new_strtold_l, strtof128_l)
+# endif
+#endif