-# frexpl.m4 serial 9
-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>]])
+
FREXPL_LIBM=
- AC_CACHE_CHECK([whether frexpl() can be used without linking with libm],
- [gl_cv_func_frexpl_no_libm],
- [
- AC_TRY_LINK([#include <math.h>
- long double x;],
- [int e; return frexpl (x, &e) > 0;],
- [gl_cv_func_frexpl_no_libm=yes],
- [gl_cv_func_frexpl_no_libm=no])
- ])
- if test $gl_cv_func_frexpl_no_libm = no; then
- AC_CACHE_CHECK([whether frexpl() can be used with libm],
- [gl_cv_func_frexpl_in_libm],
- [
- save_LIBS="$LIBS"
- LIBS="$LIBS -lm"
- AC_TRY_LINK([#include <math.h>
- long double x;],
- [int e; return frexpl (x, &e) > 0;],
- [gl_cv_func_frexpl_in_libm=yes],
- [gl_cv_func_frexpl_in_libm=no])
- LIBS="$save_LIBS"
- ])
- if test $gl_cv_func_frexpl_in_libm = yes; then
- FREXPL_LIBM=-lm
+ if test $HAVE_DECL_FREXPL = 1; then
+ gl_CHECK_FREXPL_NO_LIBM
+ if test $gl_cv_func_frexpl_no_libm = no; then
+ AC_CACHE_CHECK([whether frexpl() can be used with libm],
+ [gl_cv_func_frexpl_in_libm],
+ [
+ save_LIBS="$LIBS"
+ LIBS="$LIBS -lm"
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <math.h>
+ long double x;]],
+ [[int e; return frexpl (x, &e) > 0;]])],
+ [gl_cv_func_frexpl_in_libm=yes],
+ [gl_cv_func_frexpl_in_libm=no])
+ LIBS="$save_LIBS"
+ ])
+ if test $gl_cv_func_frexpl_in_libm = yes; then
+ FREXPL_LIBM=-lm
+ fi
+ fi
+ if test $gl_cv_func_frexpl_no_libm = yes \
+ || test $gl_cv_func_frexpl_in_libm = yes; then
+ save_LIBS="$LIBS"
+ LIBS="$LIBS $FREXPL_LIBM"
+ gl_FUNC_FREXPL_WORKS
+ LIBS="$save_LIBS"
+ case "$gl_cv_func_frexpl_works" in
+ *yes) gl_func_frexpl=yes ;;
+ *) gl_func_frexpl=no; REPLACE_FREXPL=1 ;;
+ esac
+ else
+ gl_func_frexpl=no
+ fi
+ if test $gl_func_frexpl = yes; then
+ AC_DEFINE([HAVE_FREXPL], [1],
+ [Define if the frexpl() function is available.])
fi
fi
- if test $gl_cv_func_frexpl_no_libm = yes \
- || test $gl_cv_func_frexpl_in_libm = yes; then
- save_LIBS="$LIBS"
- LIBS="$LIBS $FREXPL_LIBM"
- gl_FUNC_FREXPL_WORKS
- LIBS="$save_LIBS"
- case "$gl_cv_func_frexpl_works" in
- *yes) gl_func_frexpl=yes ;;
- *) gl_func_frexpl=no; REPLACE_FREXPL=1; FREXPL_LIBM= ;;
- esac
- else
- gl_func_frexpl=no
- fi
- if test $gl_func_frexpl = yes; then
- AC_DEFINE([HAVE_FREXPL], [1],
- [Define if the frexpl() function is available.])
- dnl Also 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>])
- else
- HAVE_DECL_FREXPL=0
- AC_LIBOBJ([frexpl])
+ if test $HAVE_DECL_FREXPL = 0 || test $gl_func_frexpl = no; then
+ 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>]])
+ if test $HAVE_DECL_FREXPL = 1; then
+ gl_CHECK_FREXPL_NO_LIBM
+ if test $gl_cv_func_frexpl_no_libm = yes; then
+ gl_FUNC_FREXPL_WORKS
+ case "$gl_cv_func_frexpl_works" in
+ *yes) gl_func_frexpl_no_libm=yes ;;
+ *) gl_func_frexpl_no_libm=no; REPLACE_FREXPL=1 ;;
+ esac
+ else
+ gl_func_frexpl_no_libm=no
+ dnl Set REPLACE_FREXPL here because the system may have frexpl in libm.
+ REPLACE_FREXPL=1
+ fi
+ if test $gl_func_frexpl_no_libm = yes; then
+ AC_DEFINE([HAVE_FREXPL_IN_LIBC], [1],
+ [Define if the frexpl() function is available in libc.])
+ fi
+ fi
+])
+
+dnl Test whether frexpl() can be used without linking with libm.
+dnl Set gl_cv_func_frexpl_no_libm to 'yes' or 'no' accordingly.
+AC_DEFUN([gl_CHECK_FREXPL_NO_LIBM],
+[
AC_CACHE_CHECK([whether frexpl() can be used without linking with libm],
[gl_cv_func_frexpl_no_libm],
[
- AC_TRY_LINK([#include <math.h>
- long double x;],
- [int e; return frexpl (x, &e) > 0;],
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <math.h>
+ long double x;]],
+ [[int e; return frexpl (x, &e) > 0;]])],
[gl_cv_func_frexpl_no_libm=yes],
[gl_cv_func_frexpl_no_libm=no])
])
- if test $gl_cv_func_frexpl_no_libm = yes; then
- gl_FUNC_FREXPL_WORKS
- case "$gl_cv_func_frexpl_works" in
- *yes) gl_func_frexpl_no_libm=yes ;;
- *) gl_func_frexpl_no_libm=no; REPLACE_FREXPL=1 ;;
- esac
- else
- gl_func_frexpl_no_libm=no
- dnl Set REPLACE_FREXPL here because the system may have frexpl in libm.
- REPLACE_FREXPL=1
- fi
- if test $gl_func_frexpl_no_libm = yes; then
- AC_DEFINE([HAVE_FREXPL_IN_LIBC], [1],
- [Define if the frexpl() function is available in libc.])
- dnl Also 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>])
- else
- HAVE_DECL_FREXPL=0
- AC_LIBOBJ([frexpl])
- fi
])
dnl Test whether frexpl() works on finite numbers (this fails on
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether frexpl works], [gl_cv_func_frexpl_works],
[
- AC_TRY_RUN([
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
#include <float.h>
#include <math.h>
/* Override the values of <float.h>, like done in float.in.h. */
# 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;
volatile long double x;
/* Test on finite numbers that fails on AIX 5.1. */
x = 16.0L;
int exp = -9999;
frexpl (x, &exp);
if (exp != 5)
- return 1;
+ result |= 1;
}
/* Test on finite numbers that fails on MacOS X 10.4, because its frexpl
function returns an invalid (incorrectly normalized) value: it returns
int exp = -9999;
long double y = frexpl (x, &exp);
if (!(exp == 1 && y == 0.505L))
- return 1;
+ result |= 2;
}
/* Test on large finite numbers. This fails on BeOS at i = 16322, while
LDBL_MAX_EXP = 16384.
int exp = -9999;
frexpl (x, &exp);
if (exp != i)
- return 1;
+ {
+ result |= 4;
+ break;
+ }
}
}
/* Test on denormalized numbers. */
/* On machines with IEEE854 arithmetic: x = 1.68105e-4932,
exp = -16382, y = 0.5. On MacOS X 10.5: exp = -16384, y = 0.5. */
if (exp != LDBL_MIN_EXP - 1)
- return 1;
+ result |= 8;
}
}
/* Test on infinite numbers. */
int exp;
long double y = frexpl (x, &exp);
if (y != x)
- return 1;
+ result |= 16;
}
- return 0;
-}], [gl_cv_func_frexpl_works=yes], [gl_cv_func_frexpl_works=no],
- [case "$host_os" in
- aix* | beos* | darwin* | irix* | mingw* | pw*)
- gl_cv_func_frexpl_works="guessing no";;
- *) gl_cv_func_frexpl_works="guessing yes";;
- esac
- ])
+ return result;
+}]])],
+ [gl_cv_func_frexpl_works=yes],
+ [gl_cv_func_frexpl_works=no],
+ [
+changequote(,)dnl
+ case "$host_os" in
+ aix | aix[3-6]* | beos* | darwin* | irix* | mingw* | pw*)
+ gl_cv_func_frexpl_works="guessing no";;
+ *) gl_cv_func_frexpl_works="guessing yes";;
+ esac
+changequote([,])dnl
+ ])
])
])
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