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# printf-frexpl.m4 serial 5
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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_frexpl() without linking with libm.
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AC_DEFUN([gl_FUNC_PRINTF_FREXPL],
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AC_REQUIRE([gl_MATH_H_DEFAULTS])
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dnl Subset of gl_FUNC_FREXPL_NO_LIBM.
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AC_CACHE_CHECK([whether frexpl can be used without linking with libm],
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[gl_cv_func_frexpl_no_libm],
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AC_TRY_LINK([#include <math.h>
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[return frexpl (x, &y) < 1;],
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[gl_cv_func_frexpl_no_libm=yes],
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[gl_cv_func_frexpl_no_libm=no])
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if test $gl_cv_func_frexpl_no_libm = yes; then
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case "$gl_cv_func_frexpl_works" in
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*yes) gl_func_frexpl_no_libm=yes ;;
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*) gl_func_frexpl_no_libm=no; REPLACE_FREXPL=1 ;;
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gl_func_frexpl_no_libm=no
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dnl Set REPLACE_FREXPL here because the system may have frexpl in libm.
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if test $gl_func_frexpl_no_libm = yes; then
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AC_DEFINE([HAVE_FREXPL_IN_LIBC], 1,
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[Define if the frexpl function is available in libc.])
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dnl Also check whether it's declared.
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dnl MacOS X 10.3 has frexpl() in libc but doesn't declare it in <math.h>.
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AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [#include <math.h>])
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AC_CACHE_CHECK([whether ldexpl can be used without linking with libm],
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[gl_cv_func_ldexpl_no_libm],
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AC_TRY_LINK([#include <math.h>
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[return ldexpl (x, y) < 1;],
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[gl_cv_func_ldexpl_no_libm=yes],
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[gl_cv_func_ldexpl_no_libm=no])
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if test $gl_cv_func_ldexpl_no_libm = yes; then
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case "$gl_cv_func_ldexpl_works" in
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AC_DEFINE([HAVE_LDEXPL_IN_LIBC], 1,
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[Define if the ldexpl function is available in libc.])
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dnl Also check whether it's declared.
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dnl MacOS X 10.3 has ldexpl() in libc but doesn't declare it in <math.h>.
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AC_CHECK_DECL([ldexpl], , [HAVE_DECL_LDEXPL=0], [#include <math.h>])
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m4/printf-frexpl.m4
