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# fmodl.m4 serial 12
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_FMODL],
[
m4_divert_text([DEFAULTS], [gl_fmodl_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
AC_REQUIRE([gl_FUNC_FMOD])
dnl Persuade glibc <math.h> to declare fmodl().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether fmodl() is declared.
dnl AIX 5.1 has fmodl() in libc but doesn't declare it in <math.h>, and the
dnl function produces NaN results for finite values.
AC_CHECK_DECL([fmodl],
[ac_cv_have_decl_fmodl=yes], [ac_cv_have_decl_fmodl=no],
[[#include <math.h>]])
dnl Test whether fmodl() exists. Assume that fmodl(), if it exists, is
dnl defined in the same library as fmod().
save_LIBS="$LIBS"
LIBS="$LIBS $FMOD_LIBM"
AC_CHECK_FUNCS([fmodl])
LIBS="$save_LIBS"
if test $ac_cv_func_fmodl = yes; then
FMODL_LIBM="$FMOD_LIBM"
if test $ac_cv_have_decl_fmodl = no; then
REPLACE_FMODL=1
fi
m4_ifdef([gl_FUNC_FMODL_IEEE], [
if test $gl_fmodl_required = ieee && test $REPLACE_FMODL = 0; then
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether fmodl works according to ISO C 99 with IEC 60559],
[gl_cv_func_fmodl_ieee],
[
save_LIBS="$LIBS"
LIBS="$LIBS $FMODL_LIBM"
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
/* Compare two numbers with ==.
This is a separate function because IRIX 6.5 "cc -O" miscompiles an
'x == x' test. */
static int
numeric_equal (long double x, long double y)
{
return x == y;
}
static long double dummy (long double x, long double y) { return 0; }
int main (int argc, char *argv[])
{
long double (* volatile my_fmodl) (long double, long double) = argc ? fmodl : dummy;
long double f;
/* Test fmodl(...,0.0L).
This test fails on OSF/1 5.1. */
f = my_fmodl (2.0L, 0.0L);
if (numeric_equal (f, f))
return 1;
return 0;
}
]])],
[gl_cv_func_fmodl_ieee=yes],
[gl_cv_func_fmodl_ieee=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_fmodl_ieee="guessing yes" ;;
# Guess yes on musl systems.
*-musl* | midipix*) gl_cv_func_fmodl_ieee="guessing yes" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_fmodl_ieee="guessing yes" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_fmodl_ieee="$gl_cross_guess_normal" ;;
esac
])
LIBS="$save_LIBS"
])
case "$gl_cv_func_fmodl_ieee" in
*yes) ;;
*) REPLACE_FMODL=1 ;;
esac
fi
])
else
HAVE_FMODL=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_fmodl, not fmodl.
AC_CHECK_DECLS([fmodl], [REPLACE_FMODL=1], , [[#include <math.h>]])
fi
if test $HAVE_FMODL = 0 || test $REPLACE_FMODL = 1; then
dnl Find libraries needed to link lib/fmodl.c.
if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
FMODL_LIBM="$FMOD_LIBM"
else
AC_REQUIRE([gl_FUNC_FABSL])
AC_REQUIRE([gl_FUNC_FREXPL])
AC_REQUIRE([gl_FUNC_TRUNCL])
AC_REQUIRE([gl_FUNC_LDEXPL])
AC_REQUIRE([gl_FUNC_ISNANL])
FMODL_LIBM=
dnl Append $FABSL_LIBM to FMODL_LIBM, avoiding gratuitous duplicates.
case " $FMODL_LIBM " in
*" $FABSL_LIBM "*) ;;
*) FMODL_LIBM="$FMODL_LIBM $FABSL_LIBM" ;;
esac
dnl Append $FREXPL_LIBM to FMODL_LIBM, avoiding gratuitous duplicates.
case " $FMODL_LIBM " in
*" $FREXPL_LIBM "*) ;;
*) FMODL_LIBM="$FMODL_LIBM $FREXPL_LIBM" ;;
esac
dnl Append $TRUNCL_LIBM to FMODL_LIBM, avoiding gratuitous duplicates.
case " $FMODL_LIBM " in
*" $TRUNCL_LIBM "*) ;;
*) FMODL_LIBM="$FMODL_LIBM $TRUNCL_LIBM" ;;
esac
dnl Append $LDEXPL_LIBM to FMODL_LIBM, avoiding gratuitous duplicates.
case " $FMODL_LIBM " in
*" $LDEXPL_LIBM "*) ;;
*) FMODL_LIBM="$FMODL_LIBM $LDEXPL_LIBM" ;;
esac
dnl Append $ISNANL_LIBM to FMODL_LIBM, avoiding gratuitous duplicates.
case " $FMODL_LIBM " in
*" $ISNANL_LIBM "*) ;;
*) FMODL_LIBM="$FMODL_LIBM $ISNANL_LIBM" ;;
esac
fi
fi
AC_SUBST([FMODL_LIBM])
])
|
