[configure PATCH] [PR32258] configure != prerequisites + no check install errors

[Rob1weld@aol.com]

Page http://gcc.gnu.org/install/prerequisites.html requires MPFR 2.2.1 (or  
later) but GCC 4.3.0 's main configure script will allow one to build gcc using 
 mpfr-2.2.0 - this is less than allowed on the prerequisites page. Patch 
level 5  should be used it is the most current. Using level 1 - 3 generates too 
many  errors in the testsuite.

More than one person has ran into installation  difficulties where the 
library and the header files do not match. The mpfr.info  has macros to test for 
this along with suggested code, lets use it.

Bug  report: _http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32258Index_ 
(http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32258Index) : 
 
 
Complete patch ( cd gcc-4_3-trunk & patch < configure_mpfr.patch )  :


configure
===================================================================
---  configure (revision 125970)
+++ configure (working copy)
@@  -4474,7 +4474,7 @@
main ()
{

-     #if MPFR_VERSION < MPFR_VERSION_NUM(2,2,0)
+    #if  MPFR_VERSION < MPFR_VERSION_NUM(2,2,1)
choke  me
#endif
mpfr_t  n;
@@ -4524,7 +4524,7 @@
main  ()
{

-    #if MPFR_VERSION <  MPFR_VERSION_NUM(2,2,1)
+    #if MPFR_VERSION <  MPFR_VERSION_NUM(2,2,5)
choke  me
#endif
mpfr_t n;  mpfr_init(n);
@@ -4600,6 +4600,51 @@
fi
fi

+
+
+# Rob - June 15 2007 - Confirm that MPFR  Library and mpfr.h versions match 
exactly
+cat >conftest.$ac_ext  <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h  >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/*  end confdefs.h.  */
+/* #include <gmp.h> */
+#include  <mpfr.h>
+int
+main ()
+{
+    if (strcmp  (mpfr_get_version (), MPFR_VERSION_STRING))  {
+       return 1;
+     }
+  ;
+  return 0;
+}
+_ACEOF
+rm -f  conftest$ac_exeext
+if { (eval echo "$as_me:$LINENO: \"$ac_link\"")  >&5
+  (eval $ac_link) 2>&5
+   ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status"  >&5
+  (exit $ac_status); } && {  ac_try='./conftest$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
+   :
+else
+echo $ECHO_N "mpfr library version and header version mismatch -  re-install 
!!!" >&6
+  echo "$as_me: program exited with status  $ac_status" >&5
+echo "$as_me: failed program was:" >&5
+sed  's/^/| /' conftest.$ac_ext >&5
+( exit $ac_status )
+fi
+rm -f  core *.core gmon.out bb.out conftest$ac_exeext conftest.$ac_objext  
conftest.$ac_ext
+
+
# Flags needed for both GMP and/or  MPFR