Rename __LONG_DOUBLE_USES_FLOAT128 to __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI

Improve the commentary to aid future developers who will stumble
upon this novel, yet not always perfect, mechanism to support
alternative formats for long double.

Likewise, rename __LONG_DOUBLE_USES_FLOAT128 to
__LDOUBLE_REDIRECTS_TO_FLOAT128_ABI now that development work
has settled down.  The command used was

git grep -l __LONG_DOUBLE_USES_FLOAT128 ':!./ChangeLog*' | \
  xargs sed -i 's/__LONG_DOUBLE_USES_FLOAT128/__LDOUBLE_REDIRECTS_TO_FLOAT128_ABI/g'

Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>

7 files changed, 13 insertions, 13 deletions

diff --git a/include/math.h b/include/math.h
index 1b3199b..3979c47 100644
--- a/include/math.h
+++ b/include/math.h
@@ -19,7 +19,7 @@ hidden_proto (__isinff)
 hidden_proto (__isnanf)
 
 #  if !defined __NO_LONG_DOUBLE_MATH \
-      && __LONG_DOUBLE_USES_FLOAT128 == 0
+      && __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 0
 hidden_proto (__finitel)
 hidden_proto (__isinfl)
 hidden_proto (__isnanl)
@@ -42,7 +42,7 @@ libm_hidden_proto (__expf)
 libm_hidden_proto (__roundeven)
 
 #  if !defined __NO_LONG_DOUBLE_MATH \
-      && __LONG_DOUBLE_USES_FLOAT128 == 0
+      && __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 0
 libm_hidden_proto (__fpclassifyl)
 libm_hidden_proto (__issignalingl)
 libm_hidden_proto (__expl)
@@ -143,7 +143,7 @@ fabsf128 (_Float128 x)
   MATH_REDIRECT_LDBL (FUNC, PREFIX, ARGS)			\
   MATH_REDIRECT_F128 (FUNC, PREFIX, ARGS)
 #   if defined __NO_LONG_DOUBLE_MATH 				\
-       || __LONG_DOUBLE_USES_FLOAT128 == 1
+       || __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1
 #    define MATH_REDIRECT_LDBL(FUNC, PREFIX, ARGS)
 #   else
 #    define MATH_REDIRECT_LDBL(FUNC, PREFIX, ARGS)			\
diff --git a/include/monetary.h b/include/monetary.h
index bddc660..5390411 100644
--- a/include/monetary.h
+++ b/include/monetary.h
@@ -1,6 +1,6 @@
 /* Workaround PR90731 with GCC 9 when using ldbl redirects in C++.  */
 #include <bits/floatn.h>
-#if defined __cplusplus && __LONG_DOUBLE_USES_FLOAT128 == 1
+#if defined __cplusplus && __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1
 # if __GNUC_PREREQ (9, 0) && !__GNUC_PREREQ (9, 3)
 #   pragma GCC system_header
 # endif
diff --git a/include/printf.h b/include/printf.h
index bdcfd29..0ed6e87 100644
--- a/include/printf.h
+++ b/include/printf.h
@@ -2,7 +2,7 @@
 
 /* Workaround PR90731 with GCC 9 when using ldbl redirects in C++.  */
 #include <bits/floatn.h>
-#if defined __cplusplus && __LONG_DOUBLE_USES_FLOAT128 == 1
+#if defined __cplusplus && __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1
 # if __GNUC_PREREQ (9, 0) && !__GNUC_PREREQ (9, 3)
 #   pragma GCC system_header
 # endif
diff --git a/include/stdio.h b/include/stdio.h
index 1c09daf..9df98b2 100644
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -5,7 +5,7 @@
 
 /* Workaround PR90731 with GCC 9 when using ldbl redirects in C++.  */
 # include <bits/floatn.h>
-# if defined __cplusplus && __LONG_DOUBLE_USES_FLOAT128 == 1
+# if defined __cplusplus && __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1
 #  if __GNUC_PREREQ (9, 0) && !__GNUC_PREREQ (9, 3)
 #    pragma GCC system_header
 #  endif
@@ -22,10 +22,10 @@
 /*  Some libc_hidden_ldbl_proto's do not map to a unique symbol when
     redirecting ldouble to _Float128 variants.  We can therefore safely
     directly alias them to their internal name.  */
-# if __LONG_DOUBLE_USES_FLOAT128 == 1 && IS_IN (libc)
+# if __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1 && IS_IN (libc)
 #  define stdio_hidden_ldbl_proto(p, f) \
   extern __typeof (p ## f) p ## f __asm (__ASMNAME ("___ieee128_" #f));
-# elif __LONG_DOUBLE_USES_FLOAT128 == 1
+# elif __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1
 #  define stdio_hidden_ldbl_proto(p,f) __LDBL_REDIR1_DECL (p ## f, p ## f ## ieee128)
 # else
 #  define stdio_hidden_ldbl_proto(p,f) libc_hidden_proto (p ## f)
@@ -101,7 +101,7 @@ libc_hidden_proto (__isoc99_vfscanf)
 #   define sscanf __isoc99_sscanf
 #  endif
 
-#  if __LONG_DOUBLE_USES_FLOAT128 == 1  && IS_IN (libc)
+#  if __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1  && IS_IN (libc)
 /* These are implemented as redirects to other public API.
    Therefore, the usual redirection fails to avoid PLT.  */
 extern __typeof (__isoc99_sscanf) ___ieee128_isoc99_sscanf __THROW;
diff --git a/include/stdlib.h b/include/stdlib.h
index 187a41e..ffcefd7 100644
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -6,7 +6,7 @@
 
 /* Workaround PR90731 with GCC 9 when using ldbl redirects in C++.  */
 #include <bits/floatn.h>
-#if defined __cplusplus && __LONG_DOUBLE_USES_FLOAT128 == 1
+#if defined __cplusplus && __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1
 # if __GNUC_PREREQ (9, 0) && !__GNUC_PREREQ (9, 3)
 #   pragma GCC system_header
 # endif
@@ -216,7 +216,7 @@ libc_hidden_proto (____strtoull_l_internal)
 #include <bits/floatn.h>
 libc_hidden_proto (strtof)
 libc_hidden_proto (strtod)
-#if __LONG_DOUBLE_USES_FLOAT128 == 0
+#if __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 0
 libc_hidden_proto (strtold)
 #endif
 libc_hidden_proto (strtol)
diff --git a/include/sys/cdefs.h b/include/sys/cdefs.h
index 9f44ac5..6a76160 100644
--- a/include/sys/cdefs.h
+++ b/include/sys/cdefs.h
@@ -16,7 +16,7 @@ rtld_hidden_proto (__chk_fail)
 /* If we are using redirects internally to support long double,
    we need to tweak some macros to ensure the PLT bypass tricks
    continue to work in libc. */
-#if __LONG_DOUBLE_USES_FLOAT128 == 1 && IS_IN (libc) && defined SHARED
+#if __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1 && IS_IN (libc) && defined SHARED
 
 # undef __LDBL_REDIR_DECL
 # define __LDBL_REDIR_DECL(func) \
diff --git a/include/wchar.h b/include/wchar.h
index bb49d84..4267985 100644
--- a/include/wchar.h
+++ b/include/wchar.h
@@ -2,7 +2,7 @@
 
 /* Workaround PR90731 with GCC 9 when using ldbl redirects in C++.  */
 # include <bits/floatn.h>
-# if defined __cplusplus && __LONG_DOUBLE_USES_FLOAT128 == 1
+# if defined __cplusplus && __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1
 #  if __GNUC_PREREQ (9, 0) && !__GNUC_PREREQ (9, 3)
 #   pragma GCC system_header
 #  endif