39 lines
1.2 KiB
Plaintext
39 lines
1.2 KiB
Plaintext
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# printf-frexp.m4 serial 5
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dnl Copyright (C) 2007, 2009-2018 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_REQUIRE([gl_CHECK_FREXP_NO_LIBM])
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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_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[[#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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