Messages in this thread | | | Date | Fri, 24 Nov 2000 02:57:45 +0100 (MET) | From | Andries.Brouwer@cwi ... | Subject | gcc 2.95.2 is buggy |
| |
Yesterday night I wrote
> Note: this is not yet a confirmed compiler bug
but in the meantime there is good confirmation. This really is a bug in gcc 2.95.2.
From bernds@redhat.com Thu Nov 23 10:45:07 2000 > Please, could you send me ...
From torvalds@transmeta.com Thu Nov 23 18:00:48 2000 > Can we get a show of hands?
Below a demo program.
Andries
-------------------- bug.c ----------------------------- /* * bug.c - aeb, 001124 * * This program shows a bug in gcc 2.95.2. * It should print 0x0 and exit. * For me it prints 0x84800000. * * Compile with: * gcc -Wall -O2 -o bug bug.c */ #include <stdio.h>
struct inode { long long i_size; struct super_block *i_sb; };
struct file { long long f_pos; };
struct super_block { int s_blocksize; unsigned char s_blocksize_bits; int s_hs; };
static char * isofs_bread(unsigned int block) { printf("0x%x\n", block); exit(0); }
static int do_isofs_readdir(struct inode *inode, struct file *filp) { int bufsize = inode->i_sb->s_blocksize; unsigned char bufbits = inode->i_sb->s_blocksize_bits; unsigned int block, offset; char *bh = NULL; int hs;
if (filp->f_pos >= inode->i_size) return 0; offset = filp->f_pos & (bufsize - 1); block = filp->f_pos >> bufbits; hs = inode->i_sb->s_hs;
while (filp->f_pos < inode->i_size) { if (!bh) bh = isofs_bread(block);
hs += block << bufbits;
if (hs == 0) filp->f_pos++;
if (offset >= bufsize) offset &= bufsize - 1;
if (*bh) filp->f_pos++;
filp->f_pos++; } return 0; }
struct super_block s; struct inode i; struct file f;
int main(int argc, char **argv){ s.s_blocksize = 512; s.s_blocksize_bits = 9; i.i_size = 2048; i.i_sb = &s; f.f_pos = 0;
do_isofs_readdir(&i,&f); return 0; } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
| |