This is caused by the lower-subreg patch (adding -fno-split-wide-types is a workaround):
$ ../../xgcc -B../../ -c -O2 -fno-common -gnatpg -gnata -I- -I../rts -I. -I ../../../../gcc/ada ../../../../gcc/ada/make.adb -c /tmp/ccXcjvZm.s: Assembler messages: /tmp/ccXcjvZm.s:6958: Error: unsupported relocation against sfp $ grep sfp make.s mr 21,sfp -- Summary: [4.3 regression] Error: unsupported relocation against sfp Product: gcc Version: 4.2.0 Status: UNCONFIRMED Keywords: wrong-code, build Severity: normal Priority: P3 Component: rtl-optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: schwab at suse dot de GCC target triplet: powerpc-suse-linux http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30761