3 dnl Copyright (C) 2007, 2009-2024 Free Software Foundation, Inc.
4 dnl This file is free software; the Free Software Foundation
5 dnl gives unlimited permission to copy and/or distribute it,
6 dnl with or without modifications, as long as this notice is preserved.
8 AC_DEFUN([gl_FUNC_CEILF],
10 m4_divert_text([DEFAULTS], [gl_ceilf_required=plain])
11 AC_REQUIRE([gl_MATH_H_DEFAULTS])
12 dnl Persuade glibc <math.h> to declare ceilf().
13 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
14 dnl Test whether ceilf() is declared.
15 AC_CHECK_DECLS([ceilf], , , [[#include <math.h>]])
16 if test "$ac_cv_have_decl_ceilf" = yes; then
17 dnl Test whether ceilf() can be used without libm.
19 if test "$CEILF_LIBM" = "?"; then
20 dnl Sun C 5.0 on Solaris declares ceilf() and has it in the system-wide
21 dnl libm.so, but not in the libm.so that the compiler uses.
24 m4_ifdef([gl_FUNC_CEILF_IEEE], [
25 if test $gl_ceilf_required = ieee && test $REPLACE_CEILF = 0; then
26 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
27 AC_CACHE_CHECK([whether ceilf works according to ISO C 99 with IEC 60559],
28 [gl_cv_func_ceilf_ieee],
31 LIBS="$LIBS $CEILF_LIBM"
34 #ifndef __NO_MATH_INLINES
35 # define __NO_MATH_INLINES 1 /* for glibc */
38 ]gl_FLOAT_MINUS_ZERO_CODE[
39 ]gl_FLOAT_SIGNBIT_CODE[
40 static float dummy (float f) { return 0; }
41 int main (int argc, char *argv[])
43 float (* volatile my_ceilf) (float) = argc ? ceilf : dummy;
45 /* Test whether ceilf (-0.0f) is -0.0f. */
46 if (signbitf (minus_zerof) && !signbitf (my_ceilf (minus_zerof)))
48 /* Test whether ceilf (-0.3f) is -0.0f. */
49 if (signbitf (-0.3f) && !signbitf (my_ceilf (-0.3f)))
54 [gl_cv_func_ceilf_ieee=yes],
55 [gl_cv_func_ceilf_ieee=no],
57 # Guess yes on glibc systems.
58 *-gnu* | gnu*) gl_cv_func_ceilf_ieee="guessing yes" ;;
59 # Guess yes on musl systems.
60 *-musl* | midipix*) gl_cv_func_ceilf_ieee="guessing yes" ;;
61 # Guess yes on native Windows.
62 mingw* | windows*) gl_cv_func_ceilf_ieee="guessing yes" ;;
63 # If we don't know, obey --enable-cross-guesses.
64 *) gl_cv_func_ceilf_ieee="$gl_cross_guess_normal" ;;
69 case "$gl_cv_func_ceilf_ieee" in
78 if test $HAVE_DECL_CEILF = 0 || test $REPLACE_CEILF = 1; then
79 dnl No libraries are needed to link lib/ceilf.c.
82 AC_SUBST([CEILF_LIBM])
85 # Determines the libraries needed to get the ceilf() function.
87 AC_DEFUN([gl_FUNC_CEILF_LIBS],
89 gl_CACHE_VAL_SILENT([gl_cv_func_ceilf_libm], [
90 gl_cv_func_ceilf_libm=?
93 [[#ifndef __NO_MATH_INLINES
94 # define __NO_MATH_INLINES 1 /* for glibc */
97 float (*funcptr) (float) = ceilf;
99 [[x = funcptr(x) + ceilf(x);]])],
100 [gl_cv_func_ceilf_libm=])
101 if test "$gl_cv_func_ceilf_libm" = "?"; then
106 [[#ifndef __NO_MATH_INLINES
107 # define __NO_MATH_INLINES 1 /* for glibc */
110 float (*funcptr) (float) = ceilf;
112 [[x = funcptr(x) + ceilf(x);]])],
113 [gl_cv_func_ceilf_libm="-lm"])
117 CEILF_LIBM="$gl_cv_func_ceilf_libm"