ldbl-128: Rename 'long double' to '_Float128'

Add a layer of macro indirection for long double files
which need to be built using another typename.  Likewise,
add the L(num) macro used in a later patch to override
real constants.

These macros are only defined through the ldbl-128
math_ldbl.h header, thereby implicitly restricting
these macros to machines which back long double
with an IEEE binary128 format.

Likewise, appropriate changes are made for the few
files which indirectly include such ldbl-128 files.

These changes produce identical binaries for s390x,
aarch64, and ppc64.

1 files changed, 4 insertions, 4 deletions

diff --git a/sysdeps/ieee754/ldbl-128/e_coshl.c b/sysdeps/ieee754/ldbl-128/e_coshl.c
index 488c318d27..0ea069316a 100644
--- a/sysdeps/ieee754/ldbl-128/e_coshl.c
+++ b/sysdeps/ieee754/ldbl-128/e_coshl.c
@@ -54,13 +54,13 @@
 #include <math.h>
 #include <math_private.h>
 
-static const long double one = 1.0, half = 0.5, huge = 1.0e4900L,
+static const _Float128 one = 1.0, half = 0.5, huge = 1.0e4900L,
 ovf_thresh = 1.1357216553474703894801348310092223067821E4L;
 
-long double
-__ieee754_coshl (long double x)
+_Float128
+__ieee754_coshl (_Float128 x)
 {
-  long double t, w;
+  _Float128 t, w;
   int32_t ex;
   ieee854_long_double_shape_type u;