When we building with gcc-4.3.x on a ppc host we get the following warnings:
dlmalloc.c: In function 'malloc_extend_top': dlmalloc.c:1971: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:1999: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2029: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2031: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2042: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c: In function 'malloc': dlmalloc.c:2245: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2245: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2253: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2258: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2263: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2318: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2327: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2329: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2344: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2356: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2360: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2362: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2363: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c: In function 'free': dlmalloc.c:2431: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2444: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2483: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2483: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c: In function 'realloc': dlmalloc.c:2594: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2599: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2604: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2605: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2637: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2646: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2647: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c: In function 'calloc': dlmalloc.c:2896: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2897: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c: In function 'malloc_trim': dlmalloc.c:2987: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2997: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:3008: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:3012: warning: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:3021: warning: dereferencing type-punned pointer will break strict-aliasing rules
This is due to pointer aliasing that the dlmalloc code does and depends on. Instead of trying trying to work around the warnings, we use the per file CFLAGs to disable the warnings via -fno-strict-aliasing.
Signed-off-by: Kumar Gala galak@kernel.crashing.org --- common/Makefile | 1 + 1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/common/Makefile b/common/Makefile index b425795..5f4959a 100644 --- a/common/Makefile +++ b/common/Makefile @@ -104,6 +104,7 @@ COBJS-y += console.o COBJS-y += cyclon2.o COBJS-y += stratixII.o COBJS-y += devices.o +CFLAGS_dlmalloc.o += -fno-strict-aliasing COBJS-y += dlmalloc.o COBJS-y += docecc.o COBJS-y += environment.o