More F77 checks.

git-svn-id: https://svn.dealii.org/trunk@3613 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/configure b/deal.II/configure
index 05aa26b3caba2cd69d4dff2ab747f0160304a55e..ff4464c474569d7288d74e066eb4b17037eaa730 100755 (executable)
--- a/deal.II/configure
+++ b/deal.II/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# From configure.in Revision: 1.42 
+# From configure.in Revision: 1.43 
 
 
 
@@ -1476,47 +1476,80 @@ fi
 
 fi
 
-F77_VERSION_STRING=`($F77 -v 2>&1)`
-if test -n "`echo $F77_VERSION_STRING | grep \"GNU F77\"`" ; then
-    G77_VERSION_STRING="`($F77 -v 2>&1) | grep \"gcc version\"`"
-  case "$G77_VERSION_STRING" in
-    *"egcs-1.1"*)
-       echo "$ac_t""compiler is egcs-1.1" 1>&6
-       F77_VERSION=egcs1.1
-       ;;
-    *2.95*)
-       echo "$ac_t""compiler is gcc-2.95" 1>&6
-       F77_VERSION=gcc2.95
-       ;;
-    *2.96*)
-       echo "$ac_t""compiler is gcc-2.96" 1>&6
-       F77_VERSION=gcc2.96
-       ;;
-    *2.97*)
-       echo "$ac_t""compiler is gcc-2.97" 1>&6
-       F77_VERSION=gcc2.97
-       ;;
-    *2.4* | *2.5* | *2.6* | *2.7* | *2.8*)
-                       echo "$ac_t""compiler is $G77_VERSION_STRING" 1>&6
-       { echo "configure: error: compiler is not supported" 1>&2; exit 1; }
-       ;;
-    *)
-       echo "$ac_t""compiler is unknown but accepted gcc version" 1>&6
-       F77_VERSION=other
-       ;;
-  esac
+if test "x$F77" != "x" ; then
+  F77_VERSION_STRING=`($F77 -v 2>&1)`
+  if test -n "`echo $F77_VERSION_STRING | grep \"GNU F77\"`" ; then
+        G77_VERSION_STRING="`($F77 -v 2>&1) | grep \"gcc version\"`"
+    case "$G77_VERSION_STRING" in
+      *"egcs-1.1"*)
+         echo "$ac_t""compiler is egcs-1.1" 1>&6
+         F77_VERSION=egcs1.1
+         ;;
+      *2.95*)
+         echo "$ac_t""compiler is gcc-2.95" 1>&6
+         F77_VERSION=gcc2.95
+         ;;
+      *2.96*)
+         echo "$ac_t""compiler is gcc-2.96" 1>&6
+         F77_VERSION=gcc2.96
+         ;;
+      *2.97*)
+         echo "$ac_t""compiler is gcc-2.97" 1>&6
+         F77_VERSION=gcc2.97
+         ;;
+      *2.4* | *2.5* | *2.6* | *2.7* | *2.8*)
+                         echo "$ac_t""compiler is $G77_VERSION_STRING" 1>&6
+         { echo "configure: error: compiler is not supported" 1>&2; exit 1; }
+         ;;
+      *)
+         echo "$ac_t""compiler is unknown but accepted gcc version" 1>&6
+         F77_VERSION=other
+         ;;
+    esac
 
-      F77FLAGSG="$FFLAGS -ggdb -DDEBUG -pedantic -W -Wall"
-  F77FLAGSO="$FFLAGS -O2"
+            F77FLAGSG="$FFLAGS -ggdb -DDEBUG -pedantic -W -Wall"
+    F77FLAGSO="$FFLAGS -O2"
 
-        if test "x$F77_VERSION" != "xegcs1.1" ; then
-    F77FLAGSO="$F77FLAGSO -funroll-loops -funroll-all-loops -fstrict-aliasing"
-  fi
+                if test "x$F77_VERSION" != "xegcs1.1" ; then
+      F77FLAGSO="$F77FLAGSO -funroll-loops -funroll-all-loops -fstrict-aliasing"
+    fi
 
-        F77LDFLAGS=-lg2c
+        if test $enableshared = yes ; then
+      F77FLAGSG="$F77FLAGSG -fPIC"
+      F77FLAGSO="$F77FLAGSO -fPIC"
+    fi
 
-else
-    F77_VERSION
+                F77LDFLAGS="-lg2c"
+
+  else
+
+        if test -n "`echo $F77_VERSION_STRING | grep \"XL Fortran for AIX\"`" ; then
+                  F77_VERSION=AIXF77
+      echo "$ac_t""compiler is AIX Fortran77" 1>&6
+
+    else
+
+                  F77_VERSION_STRING=`($F77 -V 2>&1)`
+      if test -n "`echo $F77_VERSION_STRING | grep \"WorkShop Compilers\"`" ; then
+
+               echo "$ac_t""compiler is Sun WorkShop f77" 1>&6
+       F77_VERSION="SunF77"
+       F77FLAGSG="$FFLAGS -silent -g"
+       F77FLAGSO="$FFLAGS -silent -O3 -w"
+       F77LDFLAGS="-lF77 -lsunmath -lM77"
+
+               if test $enableshared = yes ; then
+         F77FLAGSG="$F77FLAGSG -PIC"
+         F77FLAGSO="$F77FLAGSO -PIC"
+       fi
+
+      else
+
+               F77_VERSION=
+       echo "$ac_t""compiler is unkown. no flags set!" 1>&6
+      fi
+    fi
+  fi
 fi
 
 
@@ -1527,7 +1560,7 @@ fi
 # Extract the first word of "perl", so it can be a program name with args.
 set dummy perl; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:1531: checking for $ac_word" >&5
+echo "configure:1564: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_path_PERL'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1579,7 +1612,7 @@ fi
 if test $enablemultithreading = yes ; then
   
   echo $ac_n "checking for platform specific thread flags""... $ac_c" 1>&6
-echo "configure:1583: checking for platform specific thread flags" >&5
+echo "configure:1616: checking for platform specific thread flags" >&5
   
   for i in threads mt pthread pthreads mthreads Kthread kthread invalid_last_entry; do
     CXXFLAGS="$CXXFLAGSG -$i"
@@ -1615,7 +1648,7 @@ echo "configure:1583: checking for platform specific thread flags" >&5
 
   
   echo $ac_n "checking for platform specific multi-threading defines""... $ac_c" 1>&6
-echo "configure:1619: checking for platform specific multi-threading defines" >&5
+echo "configure:1652: checking for platform specific multi-threading defines" >&5
   ac_ext=C
 # CXXFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options.
 ac_cpp='$CXXCPP $CPPFLAGS'
@@ -1624,7 +1657,7 @@ ac_link='${CXX-g++} -o conftest${ac_exeext} $CXXFLAGS $CPPFLAGS $LDFLAGS conftes
 cross_compiling=$ac_cv_prog_cxx_cross
 
   cat > conftest.$ac_ext <<EOF
-#line 1628 "configure"
+#line 1661 "configure"
 #include "confdefs.h"
 
 #if !defined (_REENTRANT) && !defined (_THREAD_SAFE)
@@ -1638,7 +1671,7 @@ int main() {
    
 ; return 0; }
 EOF
-if { (eval echo configure:1642: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:1675: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   
        echo "$ac_t"""not necessary"" 1>&6
@@ -1680,7 +1713,7 @@ fi
 
 if test $withmultithreading != no ; then
   echo $ac_n "checking for ACE""... $ac_c" 1>&6
-echo "configure:1684: checking for ACE" >&5
+echo "configure:1717: checking for ACE" >&5
   if test -d $withmultithreading ; then
     echo "$ac_t""found" 1>&6
   else
@@ -1700,7 +1733,7 @@ if test "${with_blas+set}" = set; then
   withval="$with_blas"
   if test $withval != no ; then
     echo $ac_n "checking for BLAS""... $ac_c" 1>&6
-echo "configure:1704: checking for BLAS" >&5
+echo "configure:1737: checking for BLAS" >&5
     if test -r $withval ; then
       echo "$ac_t""found" 1>&6
     else
@@ -1716,7 +1749,7 @@ EOF
   
 else
   echo $ac_n "checking for main in -lblas""... $ac_c" 1>&6
-echo "configure:1720: checking for main in -lblas" >&5
+echo "configure:1753: checking for main in -lblas" >&5
 ac_lib_var=`echo blas'_'main | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -1724,14 +1757,14 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lblas  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 1728 "configure"
+#line 1761 "configure"
 #include "confdefs.h"
 
 int main() {
 main()
 ; return 0; }
 EOF
-if { (eval echo configure:1735: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:1768: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -1763,7 +1796,7 @@ if test "${with_lapack+set}" = set; then
   withval="$with_lapack"
   if test $withval != no ; then
     echo $ac_n "checking for LAPACK""... $ac_c" 1>&6
-echo "configure:1767: checking for LAPACK" >&5
+echo "configure:1800: checking for LAPACK" >&5
     if test -r $withval ; then
       echo "$ac_t""found" 1>&6
     else
@@ -1779,7 +1812,7 @@ EOF
   
 else
   echo $ac_n "checking for dgels_ in -llapack""... $ac_c" 1>&6
-echo "configure:1783: checking for dgels_ in -llapack" >&5
+echo "configure:1816: checking for dgels_ in -llapack" >&5
 ac_lib_var=`echo lapack'_'dgels_ | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -1787,7 +1820,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-llapack  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 1791 "configure"
+#line 1824 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 #ifdef __cplusplus
@@ -1801,7 +1834,7 @@ int main() {
 dgels_()
 ; return 0; }
 EOF
-if { (eval echo configure:1805: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:1838: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -1868,7 +1901,7 @@ else
 fi
 
 echo $ac_n "checking for kdoc""... $ac_c" 1>&6
-echo "configure:1872: checking for kdoc" >&5
+echo "configure:1905: checking for kdoc" >&5
 if test "$kdocdir" != ${DEAL2_DIR}/contrib/kdoc/bin ; then
   if test -r $kdocdir/kdoc ; then
     echo "$ac_t""found" 1>&6
@@ -1904,7 +1937,7 @@ if test "$docxx" = to-be-determined ; then
   # Extract the first word of ""doc++"", so it can be a program name with args.
 set dummy "doc++"; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:1908: checking for $ac_word" >&5
+echo "configure:1941: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_path_docxx'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1938,7 +1971,7 @@ fi
 
 else
   echo $ac_n "checking for doc++""... $ac_c" 1>&6
-echo "configure:1942: checking for doc++" >&5
+echo "configure:1975: checking for doc++" >&5
   if test -x "$docxx" ; then
     echo "$ac_t""yes" 1>&6
   else
@@ -1953,7 +1986,7 @@ fi
 
 
   echo $ac_n "checking whether getrusage is properly declared""... $ac_c" 1>&6
-echo "configure:1957: checking whether getrusage is properly declared" >&5
+echo "configure:1990: checking whether getrusage is properly declared" >&5
   ac_ext=C
 # CXXFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options.
 ac_cpp='$CXXCPP $CPPFLAGS'
@@ -1962,7 +1995,7 @@ ac_link='${CXX-g++} -o conftest${ac_exeext} $CXXFLAGS $CPPFLAGS $LDFLAGS conftes
 cross_compiling=$ac_cv_prog_cxx_cross
 
   cat > conftest.$ac_ext <<EOF
-#line 1966 "configure"
+#line 1999 "configure"
 #include "confdefs.h"
 
 #include <sys/resource.h>
@@ -1974,7 +2007,7 @@ int main() {
     
 ; return 0; }
 EOF
-if { (eval echo configure:1978: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2011: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   
        echo "$ac_t"""yes"" 1>&6
@@ -1992,7 +2025,7 @@ fi
 rm -f conftest*
 
     echo $ac_n "checking whether isnan is declared with debug flags""... $ac_c" 1>&6
-echo "configure:1996: checking whether isnan is declared with debug flags" >&5
+echo "configure:2029: checking whether isnan is declared with debug flags" >&5
   ac_ext=C
 # CXXFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options.
 ac_cpp='$CXXCPP $CPPFLAGS'
@@ -2003,7 +2036,7 @@ cross_compiling=$ac_cv_prog_cxx_cross
   CXXFLAGS=$CXXFLAGSG
   deal_II_isnan_flag=""
   cat > conftest.$ac_ext <<EOF
-#line 2007 "configure"
+#line 2040 "configure"
 #include "confdefs.h"
 
 #include <cmath>
@@ -2015,7 +2048,7 @@ int main() {
     
 ; return 0; }
 EOF
-if { (eval echo configure:2019: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2052: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   
        echo "$ac_t"""yes"" 1>&6
@@ -2031,7 +2064,7 @@ rm -f conftest*
 
   if test "x$deal_II_isnan_flag" = "x" ; then
             cat > conftest.$ac_ext <<EOF
-#line 2035 "configure"
+#line 2068 "configure"
 #include "confdefs.h"
 
 #include <cmath>
@@ -2043,7 +2076,7 @@ int main() {
       
 ; return 0; }
 EOF
-if { (eval echo configure:2047: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2080: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   
          echo "$ac_t"""yes"" 1>&6
@@ -2063,7 +2096,7 @@ rm -f conftest*
     for testflag in -D_ISOC99_SOURCE -D__EXTENSIONS__ ; do 
       CXXFLAGS="$CXXFLAGSG $testflag"
       cat > conftest.$ac_ext <<EOF
-#line 2067 "configure"
+#line 2100 "configure"
 #include "confdefs.h"
 
 #include <cmath>
@@ -2075,7 +2108,7 @@ int main() {
        
 ; return 0; }
 EOF
-if { (eval echo configure:2079: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2112: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   
                          deal_II_isnan_flag="-DHAVE_ISNAN $testflag"
@@ -2088,7 +2121,7 @@ fi
 rm -f conftest*
 
                         cat > conftest.$ac_ext <<EOF
-#line 2092 "configure"
+#line 2125 "configure"
 #include "confdefs.h"
 
 #include <cmath>
@@ -2100,7 +2133,7 @@ int main() {
        
 ; return 0; }
 EOF
-if { (eval echo configure:2104: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2137: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   
                          deal_II_isnan_flag="-DHAVE_UNDERSCORE_ISNAN $testflag"
@@ -2122,7 +2155,7 @@ rm -f conftest*
   fi
 
     echo $ac_n "checking whether isnan is declared with optimized flags""... $ac_c" 1>&6
-echo "configure:2126: checking whether isnan is declared with optimized flags" >&5
+echo "configure:2159: checking whether isnan is declared with optimized flags" >&5
   ac_ext=C
 # CXXFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options.
 ac_cpp='$CXXCPP $CPPFLAGS'
@@ -2133,7 +2166,7 @@ cross_compiling=$ac_cv_prog_cxx_cross
   CXXFLAGS=$CXXFLAGSO
   deal_II_isnan_flag=""
   cat > conftest.$ac_ext <<EOF
-#line 2137 "configure"
+#line 2170 "configure"
 #include "confdefs.h"
 
 #include <cmath>
@@ -2145,7 +2178,7 @@ int main() {
     
 ; return 0; }
 EOF
-if { (eval echo configure:2149: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2182: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   
        echo "$ac_t"""yes"" 1>&6
@@ -2161,7 +2194,7 @@ rm -f conftest*
 
   if test "x$deal_II_isnan_flag" = "x" ; then
             cat > conftest.$ac_ext <<EOF
-#line 2165 "configure"
+#line 2198 "configure"
 #include "confdefs.h"
 
 #include <cmath>
@@ -2173,7 +2206,7 @@ int main() {
       
 ; return 0; }
 EOF
-if { (eval echo configure:2177: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2210: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   
          echo "$ac_t"""yes"" 1>&6
@@ -2193,7 +2226,7 @@ rm -f conftest*
     for testflag in -D_ISOC99_SOURCE -D__EXTENSIONS__ ; do 
       CXXFLAGS="$CXXFLAGSO $testflag"
       cat > conftest.$ac_ext <<EOF
-#line 2197 "configure"
+#line 2230 "configure"
 #include "confdefs.h"
 
 #include <cmath>
@@ -2205,7 +2238,7 @@ int main() {
        
 ; return 0; }
 EOF
-if { (eval echo configure:2209: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2242: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   
                          deal_II_isnan_flag="-DHAVE_ISNAN $testflag"
@@ -2218,7 +2251,7 @@ fi
 rm -f conftest*
 
                         cat > conftest.$ac_ext <<EOF
-#line 2222 "configure"
+#line 2255 "configure"
 #include "confdefs.h"
 
 #include <cmath>
@@ -2230,7 +2263,7 @@ int main() {
        
 ; return 0; }
 EOF
-if { (eval echo configure:2234: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2267: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   
                          deal_II_isnan_flag="-DHAVE_UNDERSCORE_ISNAN $testflag"
@@ -2265,16 +2298,16 @@ cross_compiling=$ac_cv_prog_cxx_cross
 
 CXXFLAGS="$CXXFLAGSG"
 echo $ac_n "checking for consistency of CXXFLAGSG flags""... $ac_c" 1>&6
-echo "configure:2269: checking for consistency of CXXFLAGSG flags" >&5
+echo "configure:2302: checking for consistency of CXXFLAGSG flags" >&5
 cat > conftest.$ac_ext <<EOF
-#line 2271 "configure"
+#line 2304 "configure"
 #include "confdefs.h"
 
 int main() {
 ;
 ; return 0; }
 EOF
-if { (eval echo configure:2278: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2311: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   
     echo "$ac_t""yes" 1>&6
@@ -2292,16 +2325,16 @@ rm -f conftest*
 
 CXXFLAGS="$CXXFLAGSO"
 echo $ac_n "checking for consistency of CXXFLAGSO flags""... $ac_c" 1>&6
-echo "configure:2296: checking for consistency of CXXFLAGSO flags" >&5
+echo "configure:2329: checking for consistency of CXXFLAGSO flags" >&5
 cat > conftest.$ac_ext <<EOF
-#line 2298 "configure"
+#line 2331 "configure"
 #include "confdefs.h"
 
 int main() {
 ;
 ; return 0; }
 EOF
-if { (eval echo configure:2305: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2338: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   
     echo "$ac_t""yes" 1>&6

diff --git a/deal.II/configure.in b/deal.II/configure.in
index 3bc84b804f94b15364d9615c5e1a0d5d73b8b878..a4baa4f9ad9ab9b8e5948fb0545990baa2c92e62 100644 (file)
--- a/deal.II/configure.in
+++ b/deal.II/configure.in
@@ -300,59 +300,100 @@ dnl it may be that we don't need one (but we check below, when we must
 dnl have it).
 
 dnl Next try to find out something about the name and version of the compiler
-F77_VERSION_STRING=`($F77 -v 2>&1)`
-if test -n "`echo $F77_VERSION_STRING | grep \"GNU F77\"`" ; then
-  dnl Yes, this is a GNU g77 version. find out the right version
-  G77_VERSION_STRING="`($F77 -v 2>&1) | grep \"gcc version\"`"
-  case "$G77_VERSION_STRING" in
-    *"egcs-1.1"*)
-       AC_MSG_RESULT(compiler is egcs-1.1)
-       F77_VERSION=egcs1.1
-       ;;
-    *2.95*)
-       AC_MSG_RESULT(compiler is gcc-2.95)
-       F77_VERSION=gcc2.95
-       ;;
-    *2.96*)
-       AC_MSG_RESULT(compiler is gcc-2.96)
-       F77_VERSION=gcc2.96
-       ;;
-    *2.97*)
-       AC_MSG_RESULT(compiler is gcc-2.97)
-       F77_VERSION=gcc2.97
-       ;;
-    *2.4* | *2.5* | *2.6* | *2.7* | *2.8*)
-       dnl These compilers are too old to support a useful subset
-       dnl of modern C++, so we don't support them
-       AC_MSG_RESULT(compiler is $G77_VERSION_STRING)
-       AC_MSG_ERROR(compiler is not supported)
-       ;;
-    *)
-       AC_MSG_RESULT(compiler is unknown but accepted gcc version)
-       F77_VERSION=other
-       ;;
-  esac
+if test "x$F77" != "x" ; then
+  F77_VERSION_STRING=`($F77 -v 2>&1)`
+  if test -n "`echo $F77_VERSION_STRING | grep \"GNU F77\"`" ; then
+    dnl Yes, this is a GNU g77 version. find out the right version
+    G77_VERSION_STRING="`($F77 -v 2>&1) | grep \"gcc version\"`"
+    case "$G77_VERSION_STRING" in
+      *"egcs-1.1"*)
+         AC_MSG_RESULT(compiler is egcs-1.1)
+         F77_VERSION=egcs1.1
+         ;;
+      *2.95*)
+         AC_MSG_RESULT(compiler is gcc-2.95)
+         F77_VERSION=gcc2.95
+         ;;
+      *2.96*)
+         AC_MSG_RESULT(compiler is gcc-2.96)
+         F77_VERSION=gcc2.96
+         ;;
+      *2.97*)
+         AC_MSG_RESULT(compiler is gcc-2.97)
+         F77_VERSION=gcc2.97
+         ;;
+      *2.4* | *2.5* | *2.6* | *2.7* | *2.8*)
+         dnl These compilers are too old to support a useful subset
+         dnl of modern C++, so we don't support them
+         AC_MSG_RESULT(compiler is $G77_VERSION_STRING)
+         AC_MSG_ERROR(compiler is not supported)
+         ;;
+      *)
+         AC_MSG_RESULT(compiler is unknown but accepted gcc version)
+         F77_VERSION=other
+         ;;
+    esac
+
+    dnl For g77 versions, it is simple which flags to use since we already
+    dnl know them mostly from the C++ compiler
+    F77FLAGSG="$FFLAGS -ggdb -DDEBUG -pedantic -W -Wall"
+    F77FLAGSO="$FFLAGS -O2"
+
+    dnl Some flags can only be set for some compilers as others either
+    dnl did not accept them or were buggy on them (see the explanation
+    dnl for CXXFLAGS for an explanation of some of these cases)
+    if test "x$F77_VERSION" != "xegcs1.1" ; then
+      F77FLAGSO="$F77FLAGSO -funroll-loops -funroll-all-loops -fstrict-aliasing"
+    fi
 
-  dnl For g77 versions, it is simple which flags to use since we already
-  dnl know them mostly from the C++ compiler
-  F77FLAGSG="$FFLAGS -ggdb -DDEBUG -pedantic -W -Wall"
-  F77FLAGSO="$FFLAGS -O2"
+    dnl If necessary, add shared lib flags
+    if test $enableshared = yes ; then
+      F77FLAGSG="$F77FLAGSG -fPIC"
+      F77FLAGSO="$F77FLAGSO -fPIC"
+    fi
 
-  dnl Some flags can only be set for some compilers as others either
-  dnl did not accept them or were buggy on them (see the explanation
-  dnl for CXXFLAGS for an explanation of some of these cases)
-  if test "x$F77_VERSION" != "xegcs1.1" ; then
-    F77FLAGSO="$F77FLAGSO -funroll-loops -funroll-all-loops -fstrict-aliasing"
-  fi
+    dnl Then we have to set the set of libraries we have to link with
+    dnl when linking C++ and Fortran code with the C++ compiler. For
+    dnl g77, this is only libg2c
+    F77LDFLAGS="-lg2c"
 
-  dnl Then we have to set the set of libraries we have to link with
-  dnl when linking C++ and Fortran code with the C++ compiler. For
-  dnl g77, this is only libg2c
-  F77LDFLAGS=-lg2c
+  else
 
-else
-  dnl No GNU g77 version, something else. Don't set anything
-  F77_VERSION
+    dnl No GNU g77 version, something else. Try to find out what it is:
+    if test -n "`echo $F77_VERSION_STRING | grep \"XL Fortran for AIX\"`" ; then
+      dnl This is the "XL Fortran for AIX" compiler, but we have no set
+      dnl of reasonable compiler flags for it, so sorry!
+      F77_VERSION=AIXF77
+      AC_MSG_RESULT(compiler is AIX Fortran77)
+
+    else
+
+      dnl Umh, still something else unknown. Try to find it out by a different
+      dnl method (-V instead of -v):
+      F77_VERSION_STRING=`($F77 -V 2>&1)`
+      if test -n "`echo $F77_VERSION_STRING | grep \"WorkShop Compilers\"`" ; then
+
+        dnl OK, this is the Sun Fortran77 compiler
+       AC_MSG_RESULT(compiler is Sun WorkShop f77)
+       F77_VERSION="SunF77"
+       F77FLAGSG="$FFLAGS -silent -g"
+       F77FLAGSO="$FFLAGS -silent -O3 -w"
+       F77LDFLAGS="-lF77 -lsunmath -lM77"
+
+       dnl If necessary, add shared lib flags
+       if test $enableshared = yes ; then
+         F77FLAGSG="$F77FLAGSG -PIC"
+         F77FLAGSO="$F77FLAGSO -PIC"
+       fi
+
+      else
+
+       dnl Now, this is a hard case, we have no more clues...
+        F77_VERSION=
+       AC_MSG_RESULT(compiler is unkown. no flags set!)
+      fi
+    fi
+  fi
 fi
 AC_SUBST(F77_VERSION)
 AC_SUBST(F77FLAGSO)