http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47889
Aldy Hernandez <aldyh at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |aldyh at gcc dot gnu.org --- Comment #10 from Aldy Hernandez <aldyh at gcc dot gnu.org> --- Can we remove 4.7, 4.8, and 4.9 from the failing targets? It seems we diagnose it just fine and we don't even error out (just a warning). This is what we get on 4.8 and 4.9: reynosa:/dev/shm/trunk/gcc$ ./xgcc -B./ main.c s.c -flto -O -DPR47889 main.c:1:13: warning: type of 's' does not match original declaration [enabled by default] extern char s[1]; ^ s.c:1:14: note: previously declared here struct S { } s; ^ Similarly for 4.7: reynosa:/build/pristine-4_7/gcc$ ./xgcc -B./ main.c s.c -flto -O -DPR47889 In file included from :0:0: main.c:1:13: warning: type of 's' does not match original declaration [enabled by default] In file included from main.c:3:0, from :0: s.c:1:14: note: previously declared here So I don't see any segfault as reported in the PR. And I don't see any hard error (since Richi said we shouldn't error, which we don't...). The only place where I see an ICE is in 4.6: reynosa:/build/pristine-4.6/gcc$ ./xgcc -B./ main.c s.c -flto -O -DPR47889 main.c:1:13: warning: type of 's' does not match original declaration [enabled by default] s.c:1:14: note: previously declared here In file included from :0:0: main.c: In function 'main': main.c:5:5: internal compiler error: Segmentation fault Please submit a full bug report, with preprocessed source if appropriate. See <http://gcc.gnu.org/bugs.html> for instructions. lto-wrapper: ./xgcc returned 1 exit status /usr/bin/ld: lto-wrapper failed collect2: ld returned 1 exit status Can we just flag this exclusively as a 4.6 problem?