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# ceilf.m4 serial 19
dnl Copyright (C) 2007, 2009-2022 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_CEILF],
[
m4_divert_text([DEFAULTS], [gl_ceilf_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
dnl Persuade glibc <math.h> to declare ceilf().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether ceilf() is declared.
AC_CHECK_DECLS([ceilf], , , [[#include <math.h>]])
if test "$ac_cv_have_decl_ceilf" = yes; then
dnl Test whether ceilf() can be used without libm.
gl_FUNC_CEILF_LIBS
if test "$CEILF_LIBM" = "?"; then
dnl Sun C 5.0 on Solaris declares ceilf() and has it in the system-wide
dnl libm.so, but not in the libm.so that the compiler uses.
REPLACE_CEILF=1
fi
m4_ifdef([gl_FUNC_CEILF_IEEE], [
if test $gl_ceilf_required = ieee && test $REPLACE_CEILF = 0; then
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether ceilf works according to ISO C 99 with IEC 60559],
[gl_cv_func_ceilf_ieee],
[
save_LIBS="$LIBS"
LIBS="$LIBS $CEILF_LIBM"
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
]gl_FLOAT_MINUS_ZERO_CODE[
]gl_FLOAT_SIGNBIT_CODE[
static float dummy (float f) { return 0; }
int main (int argc, char *argv[])
{
float (* volatile my_ceilf) (float) = argc ? ceilf : dummy;
int result = 0;
/* Test whether ceilf (-0.0f) is -0.0f. */
if (signbitf (minus_zerof) && !signbitf (my_ceilf (minus_zerof)))
result |= 1;
/* Test whether ceilf (-0.3f) is -0.0f. */
if (signbitf (-0.3f) && !signbitf (my_ceilf (-0.3f)))
result |= 2;
return result;
}
]])],
[gl_cv_func_ceilf_ieee=yes],
[gl_cv_func_ceilf_ieee=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_ceilf_ieee="guessing yes" ;;
# Guess yes on musl systems.
*-musl*) gl_cv_func_ceilf_ieee="guessing yes" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_ceilf_ieee="guessing yes" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_ceilf_ieee="$gl_cross_guess_normal" ;;
esac
])
LIBS="$save_LIBS"
])
case "$gl_cv_func_ceilf_ieee" in
*yes) ;;
*) REPLACE_CEILF=1 ;;
esac
fi
])
else
HAVE_DECL_CEILF=0
fi
if test $HAVE_DECL_CEILF = 0 || test $REPLACE_CEILF = 1; then
dnl No libraries are needed to link lib/ceilf.c.
CEILF_LIBM=
fi
AC_SUBST([CEILF_LIBM])
])
# Determines the libraries needed to get the ceilf() function.
# Sets CEILF_LIBM.
AC_DEFUN([gl_FUNC_CEILF_LIBS],
[
gl_CACHE_VAL_SILENT([gl_cv_func_ceilf_libm], [
gl_cv_func_ceilf_libm=?
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
float (*funcptr) (float) = ceilf;
float x;]],
[[x = funcptr(x) + ceilf(x);]])],
[gl_cv_func_ceilf_libm=])
if test "$gl_cv_func_ceilf_libm" = "?"; then
save_LIBS="$LIBS"
LIBS="$LIBS -lm"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
float (*funcptr) (float) = ceilf;
float x;]],
[[x = funcptr(x) + ceilf(x);]])],
[gl_cv_func_ceilf_libm="-lm"])
LIBS="$save_LIBS"
fi
])
CEILF_LIBM="$gl_cv_func_ceilf_libm"
])
|
