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# logf.m4 serial 4
dnl Copyright (C) 2011-2012 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_LOGF],
[
m4_divert_text([DEFAULTS], [gl_logf_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_FUNC_LOG])
dnl Persuade glibc <math.h> to declare logf().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether logf() exists. Assume that logf(), if it exists, is
dnl defined in the same library as log().
save_LIBS="$LIBS"
LIBS="$LIBS $LOG_LIBM"
AC_CHECK_FUNCS([logf])
LIBS="$save_LIBS"
if test $ac_cv_func_logf = yes; then
LOGF_LIBM="$LOG_LIBM"
save_LIBS="$LIBS"
LIBS="$LIBS $LOGF_LIBM"
gl_FUNC_LOGF_WORKS
LIBS="$save_LIBS"
case "$gl_cv_func_logf_works" in
*yes) ;;
*) REPLACE_LOGF=1 ;;
esac
m4_ifdef([gl_FUNC_LOGF_IEEE], [
if test $gl_logf_required = ieee && test $REPLACE_LOGF = 0; then
AC_CACHE_CHECK([whether logf works according to ISO C 99 with IEC 60559],
[gl_cv_func_logf_ieee],
[
save_LIBS="$LIBS"
LIBS="$LIBS $LOGF_LIBM"
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
/* Compare two numbers with ==.
This is a separate function because IRIX 6.5 "cc -O" miscompiles an
'x == x' test. */
static int
numeric_equal (float x, float y)
{
return x == y;
}
static float dummy (float x) { return 0; }
int main (int argc, char *argv[])
{
float (*my_log) (float) = argc ? logf : dummy;
/* Test logf(negative).
This test fails on NetBSD 5.1. */
float y = my_logf (-1.0f);
if (numeric_equal (y, y))
return 1;
return 0;
}
]])],
[gl_cv_func_logf_ieee=yes],
[gl_cv_func_logf_ieee=no],
[gl_cv_func_logf_ieee="guessing no"])
LIBS="$save_LIBS"
])
case "$gl_cv_func_logf_ieee" in
*yes) ;;
*) REPLACE_LOGF=1 ;;
esac
fi
])
else
HAVE_LOGF=0
fi
if test $HAVE_LOGF = 0 || test $REPLACE_LOGF = 1; then
dnl Find libraries needed to link lib/logf.c.
if test $HAVE_LOGF = 0; then
LOGF_LIBM="$LOG_LIBM"
fi
fi
AC_SUBST([LOGF_LIBM])
])
dnl Test whether logf() works.
dnl On OSF/1 5.1, logf(-0.0f) is NaN.
AC_DEFUN([gl_FUNC_LOGF_WORKS],
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether logf works], [gl_cv_func_logf_works],
[
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <math.h>
volatile float x;
float y;
int main ()
{
x = -0.0f;
y = logf (x);
if (!(y + y == y))
return 1;
return 0;
}
]])],
[gl_cv_func_logf_works=yes],
[gl_cv_func_logf_works=no],
[case "$host_os" in
osf*) gl_cv_func_logf_works="guessing no";;
*) gl_cv_func_logf_works="guessing yes";;
esac
])
])
])
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