I'm running with gcc-4.3 from fedora 9. I get the following warnings:
dlmalloc.c: In function ‘malloc_extend_top’: dlmalloc.c:1971: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:1999: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2029: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2031: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2042: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c: In function ‘malloc’: dlmalloc.c:2245: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2245: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2253: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2258: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2263: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2318: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2327: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2329: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2344: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2356: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2360: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2362: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2363: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c: In function ‘free’: dlmalloc.c:2431: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2444: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2483: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2483: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c: In function ‘realloc’: dlmalloc.c:2594: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2599: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2604: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2605: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2637: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2646: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2647: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c: In function ‘calloc’: dlmalloc.c:2896: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2897: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c: In function ‘malloc_trim’: dlmalloc.c:2987: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:2997: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:3008: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:3012: error: dereferencing type-punned pointer will break strict-aliasing rules dlmalloc.c:3021: error: dereferencing type-punned pointer will break strict-aliasing rules
They all result from the bin_at macro in the file. I can't seem to do anything to the code to get rid of them.
I see these both on x86 or ppc host builds:
x86:
gcc -g -Os -m32 -D__KERNEL__ -DTEXT_BASE=0x387c0000 -I/local/home/ galak/u-boot/include -fno-builtin -ffreestanding -nostdinc -isystem / usr/lib/gcc/x86_64-redhat-linux/4.3.0/include -pipe -DCONFIG_I386 - D__I386__ -march=i386 -Werror -Wall -Wstrict-prototypes -fno-stack- protector -c -o dlmalloc.o dlmalloc.c
ppc:
gcc -g -Os -fPIC -ffixed-r14 -meabi -D__KERNEL__ - DTEXT_BASE=0xeff80000 -I/local/home/galak/git/u-boot-85xx/include -fno- builtin -ffreestanding -nostdinc -isystem /usr/lib/gcc/ppc64-redhat- linux/4.3.0/include -pipe -DCONFIG_PPC -D__powerpc__ -DCONFIG_MPC85xx -DCONFIG_E500 -ffixed-r2 -Wa,-me500 -msoft-float -mno-string -mno-spe - DCONFIG_E500=1 -DCONFIG_MPC85xx=1 -DCONFIG_PPC_P4080=1 -Wall -Wstrict- prototypes -fno-stack-protector -c -o dlmalloc.o dlmalloc.c
- k