* acinclude.m4 (LIBGFOR_CHECK_FPSETMASK): New check.

	* configure.ac: Check for floatingpoint.h, fptrap.h and float.h
	headers. Use LIBGFOR_CHECK_FPSETMASK. Check for fp_trap and
	fp_enable functions.
	* configure.host: Add case for systems with fpsetmask and systems
	with fp_trap/fp_enable.
	* config/fpu-sysv.h: New file, FPU code using fpsetmask.
	* config/fpu-aix.h: New file, FPU code for AIX using fp_trap and
	fp_enable.
	* aclocal.m4: Regenerate.
	* configure: Regenerate.
	* config.h.in: Regenerate.


git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@105956 138bc75d-0d04-0410-961f-82ee72b054a4

8 files changed, 706 insertions, 19 deletions

diff --git a/libgfortran/ChangeLog b/libgfortran/ChangeLog
index e56e855614e..6d47929b460 100644
--- a/libgfortran/ChangeLog
+++ b/libgfortran/ChangeLog
@@ -1,21 +1,36 @@
+2005-10-20  Francois-Xavier Coudert  <coudert@clipper.ens.fr>
+
+	* acinclude.m4 (LIBGFOR_CHECK_FPSETMASK): New check.
+	* configure.ac: Check for floatingpoint.h, fptrap.h and float.h
+	headers. Use LIBGFOR_CHECK_FPSETMASK. Check for fp_trap and
+	fp_enable functions.
+	* configure.host: Add case for systems with fpsetmask and systems
+	with fp_trap/fp_enable.
+	* config/fpu-sysv.h: New file, FPU code using fpsetmask.
+	* config/fpu-aix.h: New file, FPU code for AIX using fp_trap and
+	fp_enable.
+	* aclocal.m4: Regenerate.
+	* configure: Regenerate.
+	* config.h.in: Regenerate.
+
 2005-10-24  Jerry DeLisle  <jvdelisle@verizon.net>
 
-        PR libgfortran/24224
-        * libgfortran.h: Remove array stride error code.
-        * runtime/error.c: Remove array stride error.
-        * io/io.h: Change name of 'nml_loop_spec' to 'array_loop_spec' to be
-        generic.  Add pointer to array_loop_spec and rank to gfc_unit
-        structure.
-        * io/list_read.c: Revise nml_loop_spec references to array_loop_spec.
-        * io/transfer.c (init_loop_spec): New function to initialize
-        an array_loop_spec.
-        (next_array_record): New function to return the index to the next array
-        record by incrementing through the array_loop_spec. 
-        (next_record_r): Use new function.
-        (next_record_w): Use new function.
-        (finalize_transfer): Free memory allocated for array_loop_spec.
-        * io/unit.c (get_array_unit_len): Delete this function. Use new
-        function init_loop_spec to initialize the array_loop_spec.  
+	PR libgfortran/24224
+	* libgfortran.h: Remove array stride error code.
+	* runtime/error.c: Remove array stride error.
+	* io/io.h: Change name of 'nml_loop_spec' to 'array_loop_spec' to be
+	generic.  Add pointer to array_loop_spec and rank to gfc_unit
+	structure.
+	* io/list_read.c: Revise nml_loop_spec references to array_loop_spec.
+	* io/transfer.c (init_loop_spec): New function to initialize
+	an array_loop_spec.
+	(next_array_record): New function to return the index to the next array
+	record by incrementing through the array_loop_spec. 
+	(next_record_r): Use new function.
+	(next_record_w): Use new function.
+	(finalize_transfer): Free memory allocated for array_loop_spec.
+	* io/unit.c (get_array_unit_len): Delete this function. Use new
+	function init_loop_spec to initialize the array_loop_spec.  
 
 2005-10-24  Paul Thomas  <pault@gcc.gnu.org>
 
diff --git a/libgfortran/acinclude.m4 b/libgfortran/acinclude.m4
index a94dafafacb..857733a2e35 100644
--- a/libgfortran/acinclude.m4
+++ b/libgfortran/acinclude.m4
@@ -384,3 +384,20 @@ esac])])
 if test x"$have_working_stat" = xyes; then
   AC_DEFINE(HAVE_WORKING_STAT, 1, [Define if target has a reliable stat.])
 fi])
+
+dnl Checks for fpsetmask function.
+AC_DEFUN([LIBGFOR_CHECK_FPSETMASK], [
+  AC_CACHE_CHECK([whether fpsetmask is present], have_fpsetmask, [
+    AC_TRY_LINK([
+#if HAVE_FLOATINGPOINT_H
+# include <floatingpoint.h>
+#endif /* HAVE_FLOATINGPOINT_H */
+#if HAVE_IEEEFP_H
+# include <ieeefp.h>
+#endif /* HAVE_IEEEFP_H */],[fpsetmask(0);],
+    eval "have_fpsetmask=yes", eval "have_fpsetmask=no")
+  ])
+  if test x"$have_fpsetmask" = xyes; then
+    AC_DEFINE(HAVE_FPSETMASK, 1, [Define if you have fpsetmask.])
+  fi
+])
diff --git a/libgfortran/config.h.in b/libgfortran/config.h.in
index 8d6f6d4b204..13fc81fdb32 100644
--- a/libgfortran/config.h.in
+++ b/libgfortran/config.h.in
@@ -294,6 +294,12 @@
 /* libm includes finite */
 #undef HAVE_FINITE
 
+/* Define to 1 if you have the <floatingpoint.h> header file. */
+#undef HAVE_FLOATINGPOINT_H
+
+/* Define to 1 if you have the <float.h> header file. */
+#undef HAVE_FLOAT_H
+
 /* libm includes floor */
 #undef HAVE_FLOOR
 
@@ -303,6 +309,18 @@
 /* libm includes floorl */
 #undef HAVE_FLOORL
 
+/* Define if you have fpsetmask. */
+#undef HAVE_FPSETMASK
+
+/* Define to 1 if you have the <fptrap.h> header file. */
+#undef HAVE_FPTRAP_H
+
+/* fp_enable is present */
+#undef HAVE_FP_ENABLE
+
+/* fp_trap is present */
+#undef HAVE_FP_TRAP
+
 /* libm includes frexp */
 #undef HAVE_FREXP
 
diff --git a/libgfortran/config/fpu-aix.h b/libgfortran/config/fpu-aix.h
new file mode 100644
index 00000000000..f2fa0a587b7
--- /dev/null
+++ b/libgfortran/config/fpu-aix.h
@@ -0,0 +1,92 @@
+/* AIX FPU-related code.
+   Copyright 2005 Free Software Foundation, Inc.
+   Contributed by Francois-Xavier Coudert <coudert@clipper.ens.fr>
+
+This file is part of the GNU Fortran 95 runtime library (libgfortran).
+
+Libgfortran is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public
+License as published by the Free Software Foundation; either
+version 2 of the License, or (at your option) any later version.
+
+In addition to the permissions in the GNU General Public License, the
+Free Software Foundation gives you unlimited permission to link the
+compiled version of this file into combinations with other programs,
+and to distribute those combinations without any restriction coming
+from the use of this file.  (The General Public License restrictions
+do apply in other respects; for example, they cover modification of
+the file, and distribution when not linked into a combine
+executable.)
+
+Libgfortran is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public
+License along with libgfortran; see the file COPYING.  If not,
+write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+Boston, MA 02110-1301, USA.  */
+
+
+/* FPU-related code for AIX.  */
+#ifdef HAVE_FPTRAP_H
+#include <fptrap.h>
+#endif
+
+#ifdef HAVE_FLOAT_H
+#include <float.h>
+#endif
+
+void
+set_fpu (void)
+{
+  fptrap_t mode = 0;
+
+  if (options.fpe & GFC_FPE_INVALID)
+#ifdef TRP_INVALID
+    mode |= TRP_INVALID;
+#else
+    st_printf ("Fortran runtime warning: IEEE 'invalid operation' "
+	       "exception not supported.\n");
+#endif
+
+  if (options.fpe & GFC_FPE_DENORMAL)
+    st_printf ("Fortran runtime warning: IEEE 'denormal number' "
+	       "exception not supported.\n");
+
+  if (options.fpe & GFC_FPE_ZERO)
+#ifdef TRP_DIV_BY_ZERO
+    mode |= TRP_DIV_BY_ZERO;
+#else
+    st_printf ("Fortran runtime warning: IEEE 'division by zero' "
+	       "exception not supported.\n");
+#endif
+
+  if (options.fpe & GFC_FPE_OVERFLOW)
+#ifdef TRP_OVERFLOW
+    mode |= TRP_OVERFLOW;
+#else
+    st_printf ("Fortran runtime warning: IEEE 'overflow' "
+	       "exception not supported.\n");
+#endif
+
+  if (options.fpe & GFC_FPE_UNDERFLOW)
+#ifdef TRP_UNDERFLOW
+    mode |= TRP_UNDERFLOW;
+#else
+    st_printf ("Fortran runtime warning: IEEE 'underflow' "
+	       "exception not supported.\n");
+#endif
+
+  if (options.fpe & GFC_FPE_PRECISION)
+#ifdef TRP_UNDERFLOW
+    mode |= TRP_UNDERFLOW;
+#else
+    st_printf ("Fortran runtime warning: IEEE 'loss of precision' "
+	       "exception not supported.\n");
+#endif
+
+  fp_trap(FP_TRAP_SYNC);
+  fp_enable(mode);
+}
diff --git a/libgfortran/config/fpu-sysv.h b/libgfortran/config/fpu-sysv.h
new file mode 100644
index 00000000000..c2f28c4d17b
--- /dev/null
+++ b/libgfortran/config/fpu-sysv.h
@@ -0,0 +1,91 @@
+/* SysV FPU-related code (for systems not otherwise supported).
+   Copyright 2005 Free Software Foundation, Inc.
+   Contributed by Francois-Xavier Coudert <coudert@clipper.ens.fr>
+
+This file is part of the GNU Fortran 95 runtime library (libgfortran).
+
+Libgfortran is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public
+License as published by the Free Software Foundation; either
+version 2 of the License, or (at your option) any later version.
+
+In addition to the permissions in the GNU General Public License, the
+Free Software Foundation gives you unlimited permission to link the
+compiled version of this file into combinations with other programs,
+and to distribute those combinations without any restriction coming
+from the use of this file.  (The General Public License restrictions
+do apply in other respects; for example, they cover modification of
+the file, and distribution when not linked into a combine
+executable.)
+
+Libgfortran is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public
+License along with libgfortran; see the file COPYING.  If not,
+write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+Boston, MA 02110-1301, USA.  */
+
+
+/* FPU-related code for SysV platforms with fpsetmask().  */
+#ifdef HAVE_IEEEFP_H
+#include <ieeefp.h>
+#endif
+
+void
+set_fpu (void)
+{
+  int cw = 0;
+
+  if (options.fpe & GFC_FPE_INVALID)
+#ifdef FP_X_INV
+    cw |= FP_X_INV;
+#else
+    st_printf ("Fortran runtime warning: IEEE 'invalid operation' "
+	       "exception not supported.\n");
+#endif
+
+  if (options.fpe & GFC_FPE_DENORMAL)
+#ifdef FP_X_DNML
+    cw |= FP_X_DNML;
+#else
+    st_printf ("Fortran runtime warning: IEEE 'denormal number' "
+	       "exception not supported.\n");
+#endif
+
+  if (options.fpe & GFC_FPE_ZERO)
+#ifdef FP_X_DZ
+    cw |= FP_X_DZ;
+#else
+    st_printf ("Fortran runtime warning: IEEE 'division by zero' "
+	       "exception not supported.\n");
+#endif
+
+  if (options.fpe & GFC_FPE_OVERFLOW)
+#ifdef FP_X_OFL
+    cw |= FP_X_OFL;
+#else
+    st_printf ("Fortran runtime warning: IEEE 'overflow' "
+	       "exception not supported.\n");
+#endif
+
+  if (options.fpe & GFC_FPE_UNDERFLOW)
+#ifdef FP_X_UFL
+    cw |= FP_X_UFL;
+#else
+    st_printf ("Fortran runtime warning: IEEE 'underflow' "
+	       "exception not supported.\n");
+#endif
+
+  if (options.fpe & GFC_FPE_PRECISION)
+#ifdef FP_X_IMP
+    cw |= FP_X_IMP;
+#else
+    st_printf ("Fortran runtime warning: IEEE 'loss of precision' "
+	       "exception not supported.\n");
+#endif
+
+  fpsetmask(cw);
+}
diff --git a/libgfortran/configure b/libgfortran/configure
index b3cc868364c..fd7ee1ffa75 100755
--- a/libgfortran/configure
+++ b/libgfortran/configure
@@ -6508,7 +6508,159 @@ done
 
 
 
-for ac_header in sys/mman.h sys/types.h sys/stat.h ieeefp.h fenv.h
+for ac_header in sys/mman.h sys/types.h sys/stat.h floatingpoint.h ieeefp.h
+do
+as_ac_Header=`echo "ac_cv_header_$ac_header" | $as_tr_sh`
+if eval "test \"\${$as_ac_Header+set}\" = set"; then
+  echo "$as_me:$LINENO: checking for $ac_header" >&5
+echo $ECHO_N "checking for $ac_header... $ECHO_C" >&6
+if eval "test \"\${$as_ac_Header+set}\" = set"; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+fi
+echo "$as_me:$LINENO: result: `eval echo '${'$as_ac_Header'}'`" >&5
+echo "${ECHO_T}`eval echo '${'$as_ac_Header'}'`" >&6
+else
+  # Is the header compilable?
+echo "$as_me:$LINENO: checking $ac_header usability" >&5
+echo $ECHO_N "checking $ac_header usability... $ECHO_C" >&6
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+$ac_includes_default
+#include <$ac_header>
+_ACEOF
+rm -f conftest.$ac_objext
+if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
+  (eval $ac_compile) 2>conftest.er1
+  ac_status=$?
+  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_objext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_header_compiler=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+ac_header_compiler=no
+fi
+rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
+echo "$as_me:$LINENO: result: $ac_header_compiler" >&5
+echo "${ECHO_T}$ac_header_compiler" >&6
+
+# Is the header present?
+echo "$as_me:$LINENO: checking $ac_header presence" >&5
+echo $ECHO_N "checking $ac_header presence... $ECHO_C" >&6
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#include <$ac_header>
+_ACEOF
+if { (eval echo "$as_me:$LINENO: \"$ac_cpp conftest.$ac_ext\"") >&5
+  (eval $ac_cpp conftest.$ac_ext) 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 $ac_status); } >/dev/null; then
+  if test -s conftest.err; then
+    ac_cpp_err=$ac_c_preproc_warn_flag
+    ac_cpp_err=$ac_cpp_err$ac_c_werror_flag
+  else
+    ac_cpp_err=
+  fi
+else
+  ac_cpp_err=yes
+fi
+if test -z "$ac_cpp_err"; then
+  ac_header_preproc=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+  ac_header_preproc=no
+fi
+rm -f conftest.err conftest.$ac_ext
+echo "$as_me:$LINENO: result: $ac_header_preproc" >&5
+echo "${ECHO_T}$ac_header_preproc" >&6
+
+# So?  What about this header?
+case $ac_header_compiler:$ac_header_preproc:$ac_c_preproc_warn_flag in
+  yes:no: )
+    { echo "$as_me:$LINENO: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&5
+echo "$as_me: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header: proceeding with the compiler's result" >&5
+echo "$as_me: WARNING: $ac_header: proceeding with the compiler's result" >&2;}
+    ac_header_preproc=yes
+    ;;
+  no:yes:* )
+    { echo "$as_me:$LINENO: WARNING: $ac_header: present but cannot be compiled" >&5
+echo "$as_me: WARNING: $ac_header: present but cannot be compiled" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header:     check for missing prerequisite headers?" >&5
+echo "$as_me: WARNING: $ac_header:     check for missing prerequisite headers?" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header: see the Autoconf documentation" >&5
+echo "$as_me: WARNING: $ac_header: see the Autoconf documentation" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header:     section \"Present But Cannot Be Compiled\"" >&5
+echo "$as_me: WARNING: $ac_header:     section \"Present But Cannot Be Compiled\"" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header: proceeding with the preprocessor's result" >&5
+echo "$as_me: WARNING: $ac_header: proceeding with the preprocessor's result" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header: in the future, the compiler will take precedence" >&5
+echo "$as_me: WARNING: $ac_header: in the future, the compiler will take precedence" >&2;}
+    (
+      cat <<\_ASBOX
+## ------------------------------------------------------ ##
+## Report this to the GNU Fortran Runtime Library lists.  ##
+## ------------------------------------------------------ ##
+_ASBOX
+    ) |
+      sed "s/^/$as_me: WARNING:     /" >&2
+    ;;
+esac
+echo "$as_me:$LINENO: checking for $ac_header" >&5
+echo $ECHO_N "checking for $ac_header... $ECHO_C" >&6
+if eval "test \"\${$as_ac_Header+set}\" = set"; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  eval "$as_ac_Header=\$ac_header_preproc"
+fi
+echo "$as_me:$LINENO: result: `eval echo '${'$as_ac_Header'}'`" >&5
+echo "${ECHO_T}`eval echo '${'$as_ac_Header'}'`" >&6
+
+fi
+if test `eval echo '${'$as_ac_Header'}'` = yes; then
+  cat >>confdefs.h <<_ACEOF
+#define `echo "HAVE_$ac_header" | $as_tr_cpp` 1
+_ACEOF
+
+fi
+
+done
+
+
+
+
+for ac_header in fenv.h fptrap.h float.h
 do
 as_ac_Header=`echo "ac_cv_header_$ac_header" | $as_tr_sh`
 if eval "test \"\${$as_ac_Header+set}\" = set"; then
@@ -19587,6 +19739,292 @@ _ACEOF
 fi
 
 
+# Check for SysV fpsetmask
+
+  echo "$as_me:$LINENO: checking whether fpsetmask is present" >&5
+echo $ECHO_N "checking whether fpsetmask is present... $ECHO_C" >&6
+if test "${have_fpsetmask+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+
+    if test x$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.  */
+
+#if HAVE_FLOATINGPOINT_H
+# include <floatingpoint.h>
+#endif /* HAVE_FLOATINGPOINT_H */
+#if HAVE_IEEEFP_H
+# include <ieeefp.h>
+#endif /* HAVE_IEEEFP_H */
+int
+main ()
+{
+fpsetmask(0);
+  ;
+  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 $ac_status); }; }; then
+  eval "have_fpsetmask=yes"
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+eval "have_fpsetmask=no"
+fi
+rm -f conftest.err conftest.$ac_objext \
+      conftest$ac_exeext conftest.$ac_ext
+
+fi
+echo "$as_me:$LINENO: result: $have_fpsetmask" >&5
+echo "${ECHO_T}$have_fpsetmask" >&6
+  if test x"$have_fpsetmask" = xyes; then
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_FPSETMASK 1
+_ACEOF
+
+  fi
+
+
+# Check for AIX fp_trap and fp_enable
+echo "$as_me:$LINENO: checking for fp_trap" >&5
+echo $ECHO_N "checking for fp_trap... $ECHO_C" >&6
+if test "${ac_cv_func_fp_trap+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  if test x$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.  */
+/* Define fp_trap to an innocuous variant, in case <limits.h> declares fp_trap.
+   For example, HP-UX 11i <limits.h> declares gettimeofday.  */
+#define fp_trap innocuous_fp_trap
+
+/* System header to define __stub macros and hopefully few prototypes,
+    which can conflict with char fp_trap (); below.
+    Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
+    <limits.h> exists even on freestanding compilers.  */
+
+#ifdef __STDC__
+# include <limits.h>
+#else
+# include <assert.h>
+#endif
+
+#undef fp_trap
+
+/* 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 fp_trap ();
+/* The GNU C library defines this for functions which it implements
+    to always fail with ENOSYS.  Some functions are actually named
+    something starting with __ and the normal name is an alias.  */
+#if defined (__stub_fp_trap) || defined (__stub___fp_trap)
+choke me
+#else
+char (*f) () = fp_trap;
+#endif
+#ifdef __cplusplus
+}
+#endif
+
+int
+main ()
+{
+return f != fp_trap;
+  ;
+  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 $ac_status); }; }; then
+  ac_cv_func_fp_trap=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+ac_cv_func_fp_trap=no
+fi
+rm -f conftest.err conftest.$ac_objext \
+      conftest$ac_exeext conftest.$ac_ext
+fi
+echo "$as_me:$LINENO: result: $ac_cv_func_fp_trap" >&5
+echo "${ECHO_T}$ac_cv_func_fp_trap" >&6
+if test $ac_cv_func_fp_trap = yes; then
+  have_fp_trap=yes
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_FP_TRAP 1
+_ACEOF
+
+fi
+
+echo "$as_me:$LINENO: checking for fp_enable" >&5
+echo $ECHO_N "checking for fp_enable... $ECHO_C" >&6
+if test "${ac_cv_func_fp_enable+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  if test x$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.  */
+/* Define fp_enable to an innocuous variant, in case <limits.h> declares fp_enable.
+   For example, HP-UX 11i <limits.h> declares gettimeofday.  */
+#define fp_enable innocuous_fp_enable
+
+/* System header to define __stub macros and hopefully few prototypes,
+    which can conflict with char fp_enable (); below.
+    Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
+    <limits.h> exists even on freestanding compilers.  */
+
+#ifdef __STDC__
+# include <limits.h>
+#else
+# include <assert.h>
+#endif
+
+#undef fp_enable
+
+/* 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 fp_enable ();
+/* The GNU C library defines this for functions which it implements
+    to always fail with ENOSYS.  Some functions are actually named
+    something starting with __ and the normal name is an alias.  */
+#if defined (__stub_fp_enable) || defined (__stub___fp_enable)
+choke me
+#else
+char (*f) () = fp_enable;
+#endif
+#ifdef __cplusplus
+}
+#endif
+
+int
+main ()
+{
+return f != fp_enable;
+  ;
+  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 $ac_status); }; }; then
+  ac_cv_func_fp_enable=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+ac_cv_func_fp_enable=no
+fi
+rm -f conftest.err conftest.$ac_objext \
+      conftest$ac_exeext conftest.$ac_ext
+fi
+echo "$as_me:$LINENO: result: $ac_cv_func_fp_enable" >&5
+echo "${ECHO_T}$ac_cv_func_fp_enable" >&6
+if test $ac_cv_func_fp_enable = yes; then
+  have_fp_enable=yes
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_FP_ENABLE 1
+_ACEOF
+
+fi
+
+
 # Runs configure.host to set up necessary host-dependent shell variables.
 # We then display a message about it, and propagate them through the
 # build chain.
diff --git a/libgfortran/configure.ac b/libgfortran/configure.ac
index 59354c9e188..73b34c0d2d2 100644
--- a/libgfortran/configure.ac
+++ b/libgfortran/configure.ac
@@ -158,7 +158,8 @@ AC_TYPE_OFF_T
 AC_STDC_HEADERS
 AC_HAVE_HEADERS(stdlib.h stdio.h string.h stddef.h math.h unistd.h signal.h)
 AC_CHECK_HEADERS(time.h sys/params.h sys/time.h sys/times.h sys/resource.h)
-AC_CHECK_HEADERS(sys/mman.h sys/types.h sys/stat.h ieeefp.h fenv.h)
+AC_CHECK_HEADERS(sys/mman.h sys/types.h sys/stat.h floatingpoint.h ieeefp.h)
+AC_CHECK_HEADERS(fenv.h fptrap.h float.h)
 AC_CHECK_HEADER([complex.h],[AC_DEFINE([HAVE_COMPLEX_H], [1], [complex.h exists])])
 
 AC_CHECK_MEMBERS([struct stat.st_blksize])
@@ -346,6 +347,13 @@ AC_CHECK_LIB([m],[finite],[AC_DEFINE([HAVE_FINITE],[1],[libm includes finite])])
 # Check for GNU libc feenableexcept
 AC_CHECK_LIB([m],[feenableexcept],[have_feenableexcept=yes AC_DEFINE([HAVE_FEENABLEEXCEPT],[1],[libm includes feenableexcept])])
 
+# Check for SysV fpsetmask
+LIBGFOR_CHECK_FPSETMASK
+
+# Check for AIX fp_trap and fp_enable
+AC_CHECK_FUNC([fp_trap],[have_fp_trap=yes AC_DEFINE([HAVE_FP_TRAP],[1],[fp_trap is present])])
+AC_CHECK_FUNC([fp_enable],[have_fp_enable=yes AC_DEFINE([HAVE_FP_ENABLE],[1],[fp_enable is present])])
+
 # Runs configure.host to set up necessary host-dependent shell variables.
 # We then display a message about it, and propagate them through the
 # build chain.
diff --git a/libgfortran/configure.host b/libgfortran/configure.host
index c7cc16e17d2..73da57172d6 100644
--- a/libgfortran/configure.host
+++ b/libgfortran/configure.host
@@ -18,7 +18,7 @@
 
 
 # DEFAULTS
-fpu_host=fpu-generic
+fpu_host='fpu-generic'
 
 # HOST-SPECIFIC OVERRIDES
 case "${host_cpu}" in
@@ -30,3 +30,11 @@ esac
 if test "x${have_feenableexcept}" = "xyes"; then
   fpu_host='fpu-glibc'
 fi
+
+if test "x${have_fpsetmask}" = "xyes"; then
+  fpu_host='fpu-sysv'
+fi
+
+if test "x${have_fp_enable}" = "xyes" && test "x${have_fp_trap}" = "xyes"; then
+  fpu_host='fpu-aix'
+fi