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46 lines
1.4 KiB
Plaintext
46 lines
1.4 KiB
Plaintext
# printf-frexp.m4 serial 2
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dnl Copyright (C) 2007 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl Check how to define printf_frexp() without linking with libm.
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AC_DEFUN([gl_FUNC_PRINTF_FREXP],
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[
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AC_CACHE_CHECK([whether frexp can be used without linking with libm],
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[gl_cv_func_frexp_no_libm],
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[
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AC_TRY_LINK([#include <math.h>
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double x;
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int y;],
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[return frexp (x, &y) < 1;],
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[gl_cv_func_frexp_no_libm=yes],
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[gl_cv_func_frexp_no_libm=no])
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])
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if test $gl_cv_func_frexp_no_libm = yes; then
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gl_FUNC_FREXP_WORKS
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case "$gl_cv_func_frexp_works" in
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*yes)
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AC_DEFINE([HAVE_FREXP_IN_LIBC], 1,
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[Define if the frexp function is available in libc.])
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;;
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esac
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fi
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AC_CACHE_CHECK([whether ldexp can be used without linking with libm],
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[gl_cv_func_ldexp_no_libm],
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[
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AC_TRY_LINK([#include <math.h>
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double x;
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int y;],
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[return ldexp (x, y) < 1;],
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[gl_cv_func_ldexp_no_libm=yes],
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[gl_cv_func_ldexp_no_libm=no])
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])
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if test $gl_cv_func_ldexp_no_libm = yes; then
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AC_DEFINE([HAVE_LDEXP_IN_LIBC], 1,
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[Define if the ldexp function is available in libc.])
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fi
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])
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