------- Comment #12 from howarth at nitro dot med dot uc dot edu  2009-08-29 
01:32 -------
The following patch generated under gcc 4.4 branch is a first pass at
correcting the default triplet detected under darwin10...

Index: config.guess
===================================================================
--- config.guess        (revision 151196)
+++ config.guess        (working copy)
@@ -1258,6 +1258,15 @@
        exit ;;
     *:Darwin:*:*)
        UNAME_PROCESSOR=`uname -p` || UNAME_PROCESSOR=unknown
+        eval $set_cc_for_build
+        sed 's/^                //' << EOF >$dummy.c
+        main()
+            {
+            }
+EOF
+        if test "`gcc -o $dummy $dummy.c; file $dummy | grep -c x86_64`" = 1 ;
then
+               UNAME_PROCESSOR=x86_64 
+       fi
        case $UNAME_PROCESSOR in
            unknown) UNAME_PROCESSOR=powerpc ;;
        esac

On my MacBook Pro under darwin10, which reports...

uname -p
i386

...this generates...

./config.guess
x86_64-apple-darwin10.0.0


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41180

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