From 80d1e8623ac79431a51f617871b7fdc5d28ef917 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Wed, 1 Aug 2018 16:08:26 -0700
Subject: ieee754-h: new module

It looks like Emacs can use this for some NaN processing.
Emacs uses it only on double NaNs so it should be safe.
* MODULES.html.sh (func_all_modules): Add ieee754-h.
* config/srclist.txt: Mention ieee754.h in a comment.
* doc/glibc-headers/ieee754.texi (ieee754.h):
Gnulib now has a substitute that should work
except for long double and for non-IEEE platforms.
* lib/ieee754.in.h, m4/ieee754-h.m4, modules/ieee754-h:
* modules/ieee754-h-tests, tests/test-ieee754-h.c: New files.
---
 m4/ieee754-h.m4 | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 m4/ieee754-h.m4

(limited to 'm4/ieee754-h.m4')

diff --git a/m4/ieee754-h.m4 b/m4/ieee754-h.m4
new file mode 100644
index 0000000000..bf7c332e48
--- /dev/null
+++ b/m4/ieee754-h.m4
@@ -0,0 +1,21 @@
+# Configure ieee754-h module
+
+dnl Copyright 2018 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_IEEE754_H],
+[
+  AC_REQUIRE([AC_C_BIGENDIAN])
+  AC_CHECK_HEADERS_ONCE([ieee754.h])
+  if test $ac_cv_header_ieee754_h = yes; then
+    IEEE754_H=
+  else
+    IEEE754_H=ieee754.h
+    AC_DEFINE([_GL_REPLACE_IEEE754_H], 1,
+              [Define to 1 if <ieee754.h> is missing.])
+  fi
+  AC_SUBST([IEEE754_H])
+  AM_CONDITIONAL([GL_GENERATE_IEEE754_H], [test -n "$IEEE754_H"])
+])
-- 
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