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do not depend on signed integer overflow

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Signed integer overflow is not defined in C, so do not depend on it.

This fixes a problem with GCC 4.4.0 and -O3 where the optimizer would
consider "consumed_bytes > consumed_bytes + bytes" as a constant
expression, and never execute the die()-call.

Signed-off-by: Erik Faye-Lund <kusmabite@gmail.com>
Acked-by: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Erik Faye-Lund
2010-10-05 09:24:10 +02:00
committed by Junio C Hamano
parent b90d9b8895
commit c03c83152d
4 changed files with 15 additions and 3 deletions
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2
builtin/pack-objects.c
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@ -431,7 +431,7 @@ static int write_one(struct sha1file *f,
written_list[nr_written++] = &e->idx;
/* make sure off_t is sufficiently large not to wrap */
if (*offset > *offset + size)
if (signed_add_overflows(*offset, size))
die("pack too large for current definition of off_t");
*offset += size;
return 1;