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* TREE_USED and DECL_READ_P
       [not found] <1115898549.6964702.1532084663023.ref@mail.yahoo.com>
@ 2018-07-20 12:19 ` 冠人 王 via gcc
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From: 冠人 王 via gcc @ 2018-07-20 12:19 UTC (permalink / raw)
  To: gcc

GCC Edition:7.3.0
I find in source code/gcc/c/c-decl.c , 
Line 1265 to 1281 decides what situation leads to warnings for unused variables
I am confused about line 1266:
I think only the DECL_READ_P is enough for program to 
decides the warning for unused variables, so I can elmiminate
" !TREE_USED(p) || "
Am I right ?
The comment for "DECL_READ_P":
InVAR_DECL and PARM_DECL, set when the decl has been used except for being set  


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2018-07-20 12:19 ` TREE_USED and DECL_READ_P 冠人 王 via gcc

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