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annotate m4/atan2f.m4 @ 40057:b06060465f09

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maint: Run 'make update-copyright'
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 01 Jan 2019 00:25:11 +0100
parents 10eb9086bea0
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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18583
f0ac93bb7317 atan2f: Avoid redefinition error on MSVC.
Bruno Haible <bruno@clisp.org>
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1 # atan2f.m4 serial 3
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b06060465f09 maint: Run 'make update-copyright'
Paul Eggert <eggert@cs.ucla.edu>
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2 dnl Copyright (C) 2011-2019 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 AC_DEFUN([gl_FUNC_ATAN2F],
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8 [
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9 AC_REQUIRE([gl_MATH_H_DEFAULTS])
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10 AC_REQUIRE([gl_FUNC_ATAN2])
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11
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fdbe3125f81a math: Ensure declarations of math functions.
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12 dnl Persuade glibc <math.h> to declare atan2f().
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13 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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14
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15 dnl Test whether atan2f() exists. Assume that atan2f(), if it exists, is
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16 dnl defined in the same library as atan2().
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17 save_LIBS="$LIBS"
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18 LIBS="$LIBS $ATAN2_LIBM"
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19 AC_CHECK_FUNCS([atan2f])
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20 LIBS="$save_LIBS"
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21 if test $ac_cv_func_atan2f = yes; then
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22 ATAN2F_LIBM="$ATAN2_LIBM"
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23 else
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24 HAVE_ATAN2F=0
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parents: 18189
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25 dnl If the function is declared but does not appear to exist, it may be
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26 dnl defined as an inline function. In order to avoid a conflict, we have
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27 dnl to define rpl_atan2f, not atan2f.
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28 AC_CHECK_DECLS([atan2f], [REPLACE_ATAN2F=1], , [[#include <math.h>]])
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29 ATAN2F_LIBM="$ATAN2_LIBM"
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30 fi
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31 AC_SUBST([ATAN2F_LIBM])
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32 ])