https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86698
Bug ID: 86698
Summary: Misleading dump-file contents
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: easyhack
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: rearnsha at gcc dot gnu.org
Target Milestone: ---
Use of the comma operator in source code can lead to misleading information in
the initial dump file when trying to understand the result of the initial
parse. For example,
int f (int y, int z)
{
int x = ( z++,y);
return x;
}
Generates a dump file contents test.c.004t.original
;; Function f (null)
;; enabled by -tree-original
{
int x = z++ ;, y;
int x = z++ ;, y;
return x;
}
Firstly, the statement is printed twice, which seems to imply that the side
effects are performed twice. Secondly, the stray ';' in the middle of the
statement seems to imply that z is assigned to x, rather than y as the original
program required.
