From 55e24f06a0c72cf1e2b19a22f6cabd647db4c13d Mon Sep 17 00:00:00 2001
From: Alejandro Colomar <colomar.6.4.3@gmail.com>
Date: Fri, 25 Sep 2020 13:22:18 +0200
Subject: [PATCH] system_data_types.7: Add double_t

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
---
 man7/system_data_types.7 | 42 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/man7/system_data_types.7 b/man7/system_data_types.7
index 92e5ab4f1..e3a3856a2 100644
--- a/man7/system_data_types.7
+++ b/man7/system_data_types.7
@@ -117,6 +117,48 @@ Conforming to: C99 and later; POSIX.1-2001 and later.
 .IP
 See also:
 .BR div (3)
+.\"------------------------------------- double_t ---------------------/
+.TP
+.I double_t
+.IP
+Include:
+.IR <math.h> .
+.IP
+The implementation's most efficient floating type at least as wide as
+.IR double .
+Its type depends on the value of the macro
+.BR FLT_EVAL_METHOD ,
+defined in
+.IR <float.h> :
+.RS
+.TP
+0
+.I double_t
+is
+.IR double .
+.TP
+1
+.I double_t
+is
+.IR double .
+.TP
+2
+.I double_t
+is
+.IR "long double" .
+.IP
+For other values of
+.BR FLT_EVAL_METHOD ,
+the type of
+.I double_t
+is implementation-defined.
+.RE
+.IP
+Conforming to: C99 and later; POSIX.1-2001 and later.
+.IP
+See also the
+.I float_t
+type in this page.
 .\"------------------------------------- fenv_t -----------------------/
 .TP
 .I fenv_t