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# log10f.m4 serial 13
dnl Copyright (C) 2011-2023 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_LOG10F],
[
m4_divert_text([DEFAULTS], [gl_log10f_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_FUNC_LOG10])
dnl Persuade glibc <math.h> to declare log10f().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether log10f() exists. Assume that log10f(), if it exists, is
dnl defined in the same library as log10().
save_LIBS="$LIBS"
LIBS="$LIBS $LOG10_LIBM"
AC_CHECK_FUNCS([log10f])
LIBS="$save_LIBS"
if test $ac_cv_func_log10f = yes; then
LOG10F_LIBM="$LOG10_LIBM"
save_LIBS="$LIBS"
LIBS="$LIBS $LOG10F_LIBM"
gl_FUNC_LOG10F_WORKS
LIBS="$save_LIBS"
case "$gl_cv_func_log10f_works" in
*yes) ;;
*) REPLACE_LOG10F=1 ;;
esac
m4_ifdef([gl_FUNC_LOG10F_IEEE], [
if test $gl_log10f_required = ieee && test $REPLACE_LOG10F = 0; then
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether log10f works according to ISO C 99 with IEC 60559],
[gl_cv_func_log10f_ieee],
[
save_LIBS="$LIBS"
LIBS="$LIBS $LOG10F_LIBM"
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
/* Compare two numbers with ==.
This is a separate function because IRIX 6.5 "cc -O" miscompiles an
'x == x' test. */
static int
numeric_equal (float x, float y)
{
return x == y;
}
static float dummy (float x) { return 0; }
int main (int argc, char *argv[])
{
float (* volatile my_log10f) (float) = argc ? log10f : dummy;
/* Test log10f(negative).
This test fails on NetBSD 5.1. */
float y = my_log10f (-1.0f);
if (numeric_equal (y, y))
return 1;
return 0;
}
]])],
[gl_cv_func_log10f_ieee=yes],
[gl_cv_func_log10f_ieee=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_log10f_ieee="guessing yes" ;;
# Guess yes on musl systems.
*-musl* | midipix*) gl_cv_func_log10f_ieee="guessing yes" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_log10f_ieee="guessing yes" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_log10f_ieee="$gl_cross_guess_normal" ;;
esac
])
LIBS="$save_LIBS"
])
case "$gl_cv_func_log10f_ieee" in
*yes) ;;
*) REPLACE_LOG10F=1 ;;
esac
fi
])
else
HAVE_LOG10F=0
dnl If the function is declared but does not appear to exist, it may be
dnl defined as an inline function. In order to avoid a conflict, we have
dnl to define rpl_log10f, not log10f.
AC_CHECK_DECLS([log10f], [REPLACE_LOG10F=1], , [[#include <math.h>]])
fi
if test $HAVE_LOG10F = 0 || test $REPLACE_LOG10F = 1; then
dnl Find libraries needed to link lib/log10f.c.
if test $HAVE_LOG10F = 0; then
LOG10F_LIBM="$LOG10_LIBM"
fi
fi
AC_SUBST([LOG10F_LIBM])
])
dnl Test whether log10f() works.
dnl On OSF/1 5.1, log10f(-0.0f) is NaN.
AC_DEFUN([gl_FUNC_LOG10F_WORKS],
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether log10f works], [gl_cv_func_log10f_works],
[
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <math.h>
volatile float x;
float y;
int main ()
{
x = -0.0f;
y = log10f (x);
if (!(y + y == y))
return 1;
return 0;
}
]])],
[gl_cv_func_log10f_works=yes],
[gl_cv_func_log10f_works=no],
[case "$host_os" in
osf*) gl_cv_func_log10f_works="guessing no" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_log10f_works="guessing yes" ;;
*) gl_cv_func_log10f_works="guessing yes" ;;
esac
])
])
])
|
