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|
# log1pf.m4 serial 9
dnl Copyright (C) 2012-2023 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_LOG1PF],
[
m4_divert_text([DEFAULTS], [gl_log1pf_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_FUNC_LOG1P])
dnl Persuade glibc <math.h> to declare log1pf().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether log1pf() exists. Assume that log1pf(), if it exists, is
dnl defined in the same library as log1p().
save_LIBS="$LIBS"
LIBS="$LIBS $LOG1P_LIBM"
AC_CHECK_FUNCS([log1pf])
LIBS="$save_LIBS"
if test $ac_cv_func_log1pf = yes; then
LOG1PF_LIBM="$LOG1P_LIBM"
save_LIBS="$LIBS"
LIBS="$LIBS $LOG1PF_LIBM"
gl_FUNC_LOG1PF_WORKS
LIBS="$save_LIBS"
case "$gl_cv_func_log1pf_works" in
*yes) ;;
*) REPLACE_LOG1PF=1 ;;
esac
m4_ifdef([gl_FUNC_LOG1PF_IEEE], [
if test $gl_log1pf_required = ieee && test $REPLACE_LOG1PF = 0; then
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether log1pf works according to ISO C 99 with IEC 60559],
[gl_cv_func_log1pf_ieee],
[
save_LIBS="$LIBS"
LIBS="$LIBS $LOG1PF_LIBM"
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
]gl_FLOAT_MINUS_ZERO_CODE[
]gl_FLOAT_SIGNBIT_CODE[
static float dummy (float x) { return 0; }
int main (int argc, char *argv[])
{
float (* volatile my_log1pf) (float) = argc ? log1pf : dummy;
/* This test fails on OpenBSD 4.9, AIX 7.1. */
float y = my_log1pf (minus_zerof);
if (!(y == 0.0f) || (signbitf (minus_zerof) && !signbitf (y)))
return 1;
return 0;
}
]])],
[gl_cv_func_log1pf_ieee=yes],
[gl_cv_func_log1pf_ieee=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_log1pf_ieee="guessing yes" ;;
# Guess yes on musl systems.
*-musl* | midipix*) gl_cv_func_log1pf_ieee="guessing yes" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_log1pf_ieee="guessing yes" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_log1pf_ieee="$gl_cross_guess_normal" ;;
esac
])
LIBS="$save_LIBS"
])
case "$gl_cv_func_log1pf_ieee" in
*yes) ;;
*) REPLACE_LOG1PF=1 ;;
esac
fi
])
else
HAVE_LOG1PF=0
fi
if test $HAVE_LOG1PF = 0 || test $REPLACE_LOG1PF = 1; then
dnl Find libraries needed to link lib/log1pf.c.
LOG1PF_LIBM="$LOG1P_LIBM"
fi
AC_SUBST([LOG1PF_LIBM])
])
dnl Test whether log1pf() works.
dnl On IRIX 6.5, log1pf(-1.0f) returns +Infinity instead of -Infinity.
AC_DEFUN([gl_FUNC_LOG1PF_WORKS],
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether log1pf works], [gl_cv_func_log1pf_works],
[
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <math.h>
volatile float x;
float y;
int main ()
{
x = -1.0f;
y = log1pf (x);
if (!(y + y == y && y < 0.0f))
return 1;
return 0;
}
]])],
[gl_cv_func_log1pf_works=yes],
[gl_cv_func_log1pf_works=no],
[case "$host_os" in
irix*) gl_cv_func_log1pf_works="guessing no" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_log1pf_works="guessing yes" ;;
*) gl_cv_func_log1pf_works="guessing yes" ;;
esac
])
])
])
|
