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annotate m4/sqrtf.m4 @ 17252:7a29ec33d6c5

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author Karl Berry <karl@freefriends.org>
date Tue, 01 Jan 2013 09:17:08 -0800
parents e542fd46ad6f
children 344018b6e5d7
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16580
fdbe3125f81a math: Ensure declarations of math functions.
Bruno Haible <bruno@clisp.org>
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1 # sqrtf.m4 serial 2
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e542fd46ad6f maint: update all copyright year number ranges
Eric Blake <eblake@redhat.com>
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2 dnl Copyright (C) 2011-2013 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_SQRTF],
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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_SQRT])
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11
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12 dnl Persuade glibc <math.h> to declare sqrtf().
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13 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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14
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15 dnl Test whether sqrtf() exists. Assume that sqrtf(), if it exists, is
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16 dnl defined in the same library as sqrt().
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17 save_LIBS="$LIBS"
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18 LIBS="$LIBS $SQRT_LIBM"
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19 AC_CHECK_FUNCS([sqrtf])
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20 LIBS="$save_LIBS"
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21 if test $ac_cv_func_sqrtf = yes; then
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22 SQRTF_LIBM="$SQRT_LIBM"
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23 else
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24 HAVE_SQRTF=0
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25 SQRTF_LIBM="$SQRT_LIBM"
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26 fi
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27 AC_SUBST([SQRTF_LIBM])
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28 ])