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* [gcc r13-6435] [c++] suppress redundant null-addr warn in pfn from pmfn
@ 2023-03-03 5:36 Alexandre Oliva
0 siblings, 0 replies; only message in thread
From: Alexandre Oliva @ 2023-03-03 5:36 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:2e8686cb51896e0f89b353ae599c2c1ac5b960d6
commit r13-6435-g2e8686cb51896e0f89b353ae599c2c1ac5b960d6
Author: Alexandre Oliva <oliva@adacore.com>
Date: Fri Mar 3 01:46:56 2023 -0300
[c++] suppress redundant null-addr warn in pfn from pmfn
When TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_delta, when
we warn about comparing a pointer-to-member-function with NULL, we
also warn about comparing the pointer-to-function extracted from it
with NULL, which is redundant. Suppress the redundant warning.
for gcc/cp/ChangeLog
* typeck.cc (cp_build_binary_op): Suppress redundant warning
for pfn null test in pmfn test with vbit-in-delta.
Diff:
---
gcc/cp/typeck.cc | 17 ++++++++++++-----
1 file changed, 12 insertions(+), 5 deletions(-)
diff --git a/gcc/cp/typeck.cc b/gcc/cp/typeck.cc
index 4afb5e4f0d4..d5a3e501d8e 100644
--- a/gcc/cp/typeck.cc
+++ b/gcc/cp/typeck.cc
@@ -5780,11 +5780,18 @@ cp_build_binary_op (const op_location_t &location,
pfn0 = pfn_from_ptrmemfunc (op0);
delta0 = delta_from_ptrmemfunc (op0);
- e1 = cp_build_binary_op (location,
- EQ_EXPR,
- pfn0,
- build_zero_cst (TREE_TYPE (pfn0)),
- complain);
+ {
+ /* If we will warn below about a null-address compare
+ involving the orig_op0 ptrmemfunc, we'd likely also
+ warn about the pfn0's null-address compare, and
+ that would be redundant, so suppress it. */
+ warning_sentinel ws (warn_address);
+ e1 = cp_build_binary_op (location,
+ EQ_EXPR,
+ pfn0,
+ build_zero_cst (TREE_TYPE (pfn0)),
+ complain);
+ }
e2 = cp_build_binary_op (location,
BIT_AND_EXPR,
delta0,
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2023-03-03 5:36 [gcc r13-6435] [c++] suppress redundant null-addr warn in pfn from pmfn Alexandre Oliva
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