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Substitute a <ieee754.h> on hosts lacking it

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* .gitignore: Add lib/ieee754.h.
* admin/merge-gnulib (GNULIB_MODULES): Add ieee754-h.
* configure.ac: Remove ieee754.h check, as Gnulib now does that.
* etc/NEWS: Mention this.
* lib/gnulib.mk.in, m4/gnulib-comp.m4: Regenerate.
* lib/ieee754.in.h, m4/ieee754-h.m4: New files, from Gnulib.
* src/lisp.h (IEEE_FLOATING_POINT): Now a macro so that it
can be used in #if.
* src/lread.c, src/print.c: Include <ieee754.h> if
IEEE_FLOATING_POINT, not if HAVE_IEEE754_H.
* src/lread.c (string_to_number):
* src/print.c (float_to_string):
Process NaNs only on IEEE hosts, and assume <ieee754.h>
in that case.
This commit is contained in:
Paul Eggert 2018-08-01 18:53:31 -07:00
parent 2f37ecaefc
commit d216d7d248
11 changed files with 291 additions and 40 deletions
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21
m4/ieee754-h.m4 Normal file
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# 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"])
])