-# frexpl.m4 serial 13
-dnl Copyright (C) 2007-2010 Free Software Foundation, Inc.
+# frexpl.m4 serial 19
+dnl Copyright (C) 2007-2012 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_FREXPL],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
+ AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
+
+ dnl Persuade glibc <math.h> to declare frexpl().
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
dnl Check whether it's declared.
dnl MacOS X 10.3 has frexpl() in libc but doesn't declare it in <math.h>.
- AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [#include <math.h>])
+ AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [[#include <math.h>]])
+
FREXPL_LIBM=
if test $HAVE_DECL_FREXPL = 1; then
gl_CHECK_FREXPL_NO_LIBM
LIBS="$save_LIBS"
case "$gl_cv_func_frexpl_works" in
*yes) gl_func_frexpl=yes ;;
- *) gl_func_frexpl=no; REPLACE_FREXPL=1; FREXPL_LIBM= ;;
+ *) gl_func_frexpl=no; REPLACE_FREXPL=1 ;;
esac
else
gl_func_frexpl=no
fi
fi
if test $HAVE_DECL_FREXPL = 0 || test $gl_func_frexpl = no; then
- AC_LIBOBJ([frexpl])
+ dnl Find libraries needed to link lib/frexpl.c.
+ if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
+ AC_REQUIRE([gl_FUNC_FREXP])
+ FREXPL_LIBM="$FREXP_LIBM"
+ else
+ FREXPL_LIBM=
+ fi
fi
AC_SUBST([FREXPL_LIBM])
])
AC_DEFUN([gl_FUNC_FREXPL_NO_LIBM],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
+ AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
dnl Check whether it's declared.
dnl MacOS X 10.3 has frexpl() in libc but doesn't declare it in <math.h>.
- AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [#include <math.h>])
+ AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [[#include <math.h>]])
if test $HAVE_DECL_FREXPL = 1; then
gl_CHECK_FREXPL_NO_LIBM
if test $gl_cv_func_frexpl_no_libm = yes; then
[Define if the frexpl() function is available in libc.])
fi
fi
- if test $HAVE_DECL_FREXPL = 0 || test $gl_func_frexpl_no_libm = no; then
- AC_LIBOBJ([frexpl])
- fi
])
dnl Test whether frexpl() can be used without linking with libm.
# undef LDBL_MIN_EXP
# define LDBL_MIN_EXP (-16381)
#endif
-extern long double frexpl (long double, int *);
+#if defined __i386__ && defined __FreeBSD__
+# undef LDBL_MIN_EXP
+# define LDBL_MIN_EXP (-16381)
+#endif
+#if (defined _ARCH_PPC || defined _POWER) && defined _AIX && (LDBL_MANT_DIG == 106) && defined __GNUC__
+# undef LDBL_MIN_EXP
+# define LDBL_MIN_EXP DBL_MIN_EXP
+#endif
+#if defined __sgi && (LDBL_MANT_DIG >= 106)
+# if defined __GNUC__
+# undef LDBL_MIN_EXP
+# define LDBL_MIN_EXP DBL_MIN_EXP
+# endif
+#endif
+extern
+#ifdef __cplusplus
+"C"
+#endif
+long double frexpl (long double, int *);
int main()
{
int result = 0;