re PR libfortran/15960 (missing function 'finite' on HP-UX 11.11)

PR libfortran/15960
	* configure.ac: Check for finite in libm.
	* libgfortran.h: Define isfinite macro if not defined.
	* intrinsics/c99_functions.c: Use defined(fpclassify) instead of
	HAVE_FPCLASSIFY.
	* io/write.c (write_float): Use isfinite instead of finite.
	* configure, config.h.in: Rebuilt.

From-SVN: r91064

libgfortran/ChangeLog

@@ -1,3 +1,13 @@
+2004-11-22  Steven Bosscher  <stevenb@suse.de>
+
+	PR libfortran/15960
+	* configure.ac: Check for finite in libm.
+	* libgfortran.h: Define isfinite macro if not defined.
+	* intrinsics/c99_functions.c: Use defined(fpclassify) instead of
+	HAVE_FPCLASSIFY.
+	* io/write.c (write_float): Use isfinite instead of finite.
+	* configure, config.h.in: Rebuilt.
+
 2004-11-20  Roger Sayle  <roger@eyesopen.com>
 
 	* io/write.c (write_float, list_formatted_write): Fix indentation.

libgfortran/config.h.in

@@ -45,6 +45,9 @@
 /* libm includes expf */
 #undef HAVE_EXPF
 
+/* libm includes finite */
+#undef HAVE_FINITE
+
 /* libm includes floorf */
 #undef HAVE_FLOORF
 

libgfortran/configure

@@ -10323,6 +10323,85 @@ _ACEOF
 fi
 
 
+# Fallback in case isfinite is not available.
+echo "$as_me:$LINENO: checking for finite in -lm" >&5
+echo $ECHO_N "checking for finite in -lm... $ECHO_C" >&6
+if test "${ac_cv_lib_m_finite+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lm  $LIBS"
+if test x$gcc_no_link = xyes; then
+  { { echo "$as_me:$LINENO: error: Link tests are not allowed after GCC_NO_EXECUTABLES." >&5
+echo "$as_me: error: Link tests are not allowed after GCC_NO_EXECUTABLES." >&2;}
+   { (exit 1); exit 1; }; }
+fi
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+/* Override any gcc2 internal prototype to avoid an error.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+/* We use char because int might match the return type of a gcc2
+   builtin and then its argument prototype would still apply.  */
+char finite ();
+int
+main ()
+{
+finite ();
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
+  (eval $ac_link) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest$ac_exeext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_cv_lib_m_finite=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+ac_cv_lib_m_finite=no
+fi
+rm -f conftest.err conftest.$ac_objext \
+      conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+echo "$as_me:$LINENO: result: $ac_cv_lib_m_finite" >&5
+echo "${ECHO_T}$ac_cv_lib_m_finite" >&6
+if test $ac_cv_lib_m_finite = yes; then
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_FINITE 1
+_ACEOF
+
+fi
+
+
 # Let the user override this
 # Check whether --enable-cmath or --disable-cmath was given.
 if test "${enable_cmath+set}" = set; then

libgfortran/configure.ac

@@ -210,6 +210,9 @@ AC_CHECK_LIB([m],[y1f],[AC_DEFINE([HAVE_Y1F],[1],[libm includes y1f])])
 AC_CHECK_LIB([m],[yn],[AC_DEFINE([HAVE_YN],[1],[libm includes yn])])
 AC_CHECK_LIB([m],[ynf],[AC_DEFINE([HAVE_YNF],[1],[libm includes ynf])])
 
+# Fallback in case isfinite is not available.
+AC_CHECK_LIB([m],[finite],[AC_DEFINE([HAVE_FINITE],[1],[libm includes finite])])
+
 # Let the user override this
 AC_ARG_ENABLE(cmath,
 	AC_HELP_STRING([--enable-cmath],[Include complex math functions]),

libgfortran/intrinsics/c99_functions.c

@@ -254,7 +254,7 @@ powf(float x, float y)
 }
 #endif
 
-/* Note that if HAVE_FPCLASSIFY is not defined, then NaN is not handled */
+/* Note that if fpclassify is not defined, then NaN is not handled */
 
 /* Algorithm by Steven G. Kargl.  */
 
@@ -266,7 +266,7 @@ double
 round(double x)
 {
    double t;
-#ifdef HAVE_FPCLASSIFY
+#if defined(fpclassify)
    int i;
    i = fpclassify(x);
    if (i == FP_INFINITE || i == FP_NAN)
@@ -298,7 +298,7 @@ float
 roundf(float x)
 {
    float t;
-#ifdef HAVE_FPCLASSIFY
+#if defined(fpclassify)
    int i;
 
    i = fpclassify(x);

libgfortran/io/write.c

@@ -654,7 +654,7 @@ write_float (fnode *f, const char *source, int len)
 
   if (f->format != FMT_B && f->format != FMT_O && f->format != FMT_Z)
     {
-      res = finite (n);
+      res = isfinite (n);
       if (res == 0)
 	{
 	  nb =  f->u.real.w;

libgfortran/libgfortran.h

@@ -82,6 +82,24 @@ typedef off_t gfc_offset;
 #define offsetof(TYPE, MEMBER)  ((size_t) &((TYPE *) 0)->MEMBER)
 #endif
 
+/* The isfinite macro is only available with C99, but some non-C99
+   systems still provide fpclassify, and there is a `finite' function
+   in BSD.  When isfinite is not available, try to use one of the
+   alternatives, or bail out.  */
+#if !defined(isfinite)
+static inline int
+isfinite (double x)
+{
+#if defined(fpclassify)
+  return (fpclassify(x) != FP_NAN && fpclassify(x) != FP_INFINITE);
+#elif defined(HAVE_FINITE)
+  return finite (x);
+#else
+#error "libgfortran needs isfinite, fpclassify, or finite"
+#endif
+}
+#endif /* !defined(isfinite)  */
+
 /* TODO: find the C99 version of these an move into above ifdef.  */
 #define REALPART(z) (__real__(z))
 #define IMAGPART(z) (__imag__(z))
@@ -441,5 +459,5 @@ typedef GFC_ARRAY_DESCRIPTOR (GFC_MAX_DIMENSIONS, void) array_t;
 #define size0 prefix(size0)
 index_type size0 (const array_t * array); 
 
-#endif
+#endif  /* LIBGFOR_H  */