Hi Guys,
I tried bootstrapping the mainline gcc sources over the weekend,
using the current mainline binutils sources in an integrated source
tree. The bootstrap failed with a problem in bfd/elflink.c which I
have already reported and worked around. The build then failed
later on with this error message:
opcodes/i386-dis.c:4213: error: type mismatch in pointer plus expression
struct dis386 *
struct dis386[8] *
unsigned int
dp = &float_reg + D.7721
I tracked this down to this line in i386-dis.c:
dp = &float_reg[floatop - 0xd8][modrm.reg];
where the variables involved are typed as:
const struct dis386 *dp;
static const struct dis386 float_reg[][8] = { ....
To me this looks wrong. Gcc appears to have converted multiple
deferences of a multidimensional array into a single dereference of
the multidimensional array.
I found a workaround by explicitly performing the two dereferences
one after another like this:
{
typedef struct dis386 eight_dis386 [8];
const eight_dis386 *dp8;
dp8 = float_reg + (floatop - 0xd8);
dp = dp8[modrm.reg];
}
But before I check such a patch in I would like to know if the gcc
error message is really correct, or if I have run across a
gimplification bug.
Cheers
Nick
