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git-compat-util: st_add4: work around gcc 4.2.x compiler crash 

Although changes by 5b442c4 (tree-diff: catch integer overflow in
combine_diff_path allocation, 2016-02-19) are perfectly valid, they
unfortunately trigger an internal compiler error in gcc 4.2.x:

    combine-diff.c: In function 'diff_tree_combined':
    combine-diff.c:1391: internal compiler error: Segmentation fault: 11

Experimentation reveals that changing st_add4()'s argument evaluation
order is sufficient to sidestep this problem.

Although st_add3() does not trigger the compiler bug, for style
consistency, change its argument evaluation order to match.

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Eric Sunshine 2016-03-21 00:35:57 -04:00 committed by Junio C Hamano
parent 935de81289
commit d616fbf256
1 changed files with 2 additions and 2 deletions
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4
git-compat-util.h
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@ -713,8 +713,8 @@ static inline size_t st_add(size_t a, size_t b)
(uintmax_t)a, (uintmax_t)b);
return a + b;
}
#define st_add3(a,b,c) st_add((a),st_add((b),(c)))
#define st_add4(a,b,c,d) st_add((a),st_add3((b),(c),(d)))
#define st_add3(a,b,c) st_add(st_add((a),(b)),(c))
#define st_add4(a,b,c,d) st_add(st_add3((a),(b),(c)),(d))
static inline size_t st_mult(size_t a, size_t b)
{