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Undo broken %elif change, and put in a big comment explaining why the

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existing code is correct.
This commit is contained in:
H. Peter Anvin 2002-05-22 22:59:40 +00:00
parent e4b9254447
commit 0c60815d91
1 changed files with 10 additions and 2 deletions
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12
preproc.c
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@ -2270,8 +2270,16 @@ do_directive(Token * tline)
istk->conds->state = COND_NEVER;
else
{
j = if_condition(tline->next, i);
tline->next = NULL; /* it got freed */
/*
* IMPORTANT: In the case of %if, we will already have
* called expand_mmac_params(); however, if we're
* processing an %elif we must have been in a
* non-emitting mode, which would have inhibited
* the normal invocation of expand_mmac_params(). Therefore,
* we have to do it explicitly here.
*/
j = if_condition(expand_mmac_params(tline->next), i);
tline->next = NULL; /* it got freed */
free_tlist(origline);
istk->conds->state =
j < 0 ? COND_NEVER : j ? COND_IF_TRUE : COND_IF_FALSE;