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annotate m4/atan2f.m4 @ 15890:52fb6ed99832

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New module 'atan2f'. * lib/math.in.h (atan2f): New declaration. * lib/atan2f.c: New file. * m4/atan2f.m4: New file. * m4/math_h.m4 (gl_MATH_H): Test whether atan2f is declared. (gl_MATH_H_DEFAULTS): Initialize GNULIB_ATAN2F, HAVE_ATAN2F. * modules/math (Makefile.am): Substitute GNULIB_ATAN2F, HAVE_ATAN2F. * modules/atan2f: New file. * tests/test-math-c++.cc: Check the declaration of atan2f. * doc/posix-functions/atan2f.texi: Mention the new module.
author Bruno Haible <bruno@clisp.org>
date Sun, 09 Oct 2011 00:31:51 +0200
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children 8250f2777afc
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15890
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1 # atan2f.m4 serial 1
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2 dnl Copyright (C) 2011 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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12 dnl Test whether atan2f() exists. Assume that atan2f(), if it exists, is
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13 dnl defined in the same library as atan2().
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14 save_LIBS="$LIBS"
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15 LIBS="$LIBS $ATAN2_LIBM"
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16 AC_CHECK_FUNCS([atan2f])
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17 LIBS="$save_LIBS"
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18 if test $ac_cv_func_atan2f = yes; then
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19 ATAN2F_LIBM="$ATAN2_LIBM"
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20 else
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21 HAVE_ATAN2F=0
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22 ATAN2F_LIBM="$ATAN2_LIBM"
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23 fi
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24 AC_SUBST([ATAN2F_LIBM])
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25 ])