Relocate alpha from ports to libc

Also fixed the following whitespace nits to satisfy the push:

sysdeps/alpha/alphaev6/memset.S:142: space before tab in indent.
sysdeps/alpha/configure:1: new blank line at EOF.
sysdeps/alpha/fpu/e_sqrt.c:126: space before tab in indent.
sysdeps/alpha/preconfigure:1: new blank line at EOF.
sysdeps/unix/sysv/linux/alpha/syscalls.list:1: new blank line at EOF.

1 files changed, 58 insertions, 0 deletions

diff --git a/sysdeps/alpha/fpu/cfloat-compat.h b/sysdeps/alpha/fpu/cfloat-compat.h
new file mode 100644
index 0000000000..b94dec0b28
--- /dev/null
+++ b/sysdeps/alpha/fpu/cfloat-compat.h
@@ -0,0 +1,58 @@
+/* Compatibility macros for old and new Alpha complex float ABI.
+   Copyright (C) 2004-2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* The behaviour of complex float changed between GCC 3.3 and 3.4.
+
+   In 3.3 and before (below, complex version 1, or "c1"), complex float
+   values were packed into one floating point register.
+
+   In 3.4 and later (below, complex version 2, or "c2"), GCC changed to
+   follow the official Tru64 ABI, which passes the components of a complex
+   as separate parameters.  */
+
+typedef union { double d; _Complex float cf; } c1_compat;
+# define c1_cfloat_decl(x)	double x
+# define c1_cfloat_real(x)	__real__ c1_cfloat_value (x)
+# define c1_cfloat_imag(x)	__imag__ c1_cfloat_value (x)
+# define c1_cfloat_value(x)	(((c1_compat *)(void *)&x)->cf)
+# define c1_cfloat_rettype	double
+# define c1_cfloat_return(x)	({ c1_compat _; _.cf = (x); _.d; })
+
+# define c2_cfloat_decl(x)	_Complex float x
+# define c2_cfloat_real(x)	__real__ x
+# define c2_cfloat_imag(x)	__imag__ x
+# define c2_cfloat_value(x)	x
+# define c2_cfloat_rettype	_Complex float
+# define c2_cfloat_return(x)	x
+
+/* Get the proper symbol versions defined for each function.  */
+
+#include <shlib-compat.h>
+
+#if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_3_4)
+#define cfloat_versions_compat(func) \
+  compat_symbol (libm, __c1_##func, func, GLIBC_2_1)
+#else
+#define cfloat_versions_compat(func)
+#endif
+
+#define cfloat_versions(func) \
+  cfloat_versions_compat(func); \
+  versioned_symbol (libm, __c2_##func, func, GLIBC_2_3_4); \
+  extern typeof(__c2_##func) __##func attribute_hidden; \
+  strong_alias (__c2_##func, __##func)