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Remove __long_double_t

sys/cdefs.h has a macro __long_double_t used in two places in glibc.
long double is a standard part of C since C89; there is no need for
such an alias for it.  This patch removes that macro and uses long
double directly everywhere.  As an implementation-namespace,
undocumented symbol, it should not be considered part of the API for
users, and shows no sign of it being used
outside glibc in a way that would break with this patch.

Tested for x86_64.

2017-08-04  Joseph Myers  <>

	* misc/sys/cdefs.h (__long_double_t): Remove.
	* stdio-common/printf_fp.c (__printf_fp_l): Use long double
	instead of __long_double_t,
	* stdlib/strfmon_l.c (__vstrfmon_l): Likewise.

diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h
index 06523bf..b3e7f3b 100644
--- a/misc/sys/cdefs.h
+++ b/misc/sys/cdefs.h
@@ -102,7 +102,6 @@
 /* This is not a typedef so `const __ptr_t' does the right thing.  */
 #define __ptr_t void *
-#define __long_double_t  long double
 /* C++ needs to know that types and declarations are C, not C++.  */
diff --git a/stdio-common/printf_fp.c b/stdio-common/printf_fp.c
index 514b698..3ed4037 100644
--- a/stdio-common/printf_fp.c
+++ b/stdio-common/printf_fp.c
@@ -217,7 +217,7 @@ __printf_fp_l (FILE *fp, locale_t loc,
       double dbl;
-      __long_double_t ldbl;
+      long double ldbl;
       _Float128 f128;
diff --git a/stdlib/strfmon_l.c b/stdlib/strfmon_l.c
index 69ca9d5..98554df 100644
--- a/stdlib/strfmon_l.c
+++ b/stdlib/strfmon_l.c
@@ -100,7 +100,7 @@ __vstrfmon_l (char *s, size_t maxsize, locale_t loc, const char *format,
 	double dbl;
-	__long_double_t ldbl;
+	long double ldbl;
       int int_format;

Joseph S. Myers

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