https://bugs.llvm.org/show_bug.cgi?id=52274
Bug ID: 52274
Summary: -Wunused-but-set-parameter diagnostic warns about
parameter += 1 but not parameter++
Product: clang
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: cpeter...@mozilla.com
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org,
neeil...@live.com, richard-l...@metafoo.co.uk
When compiled with `clang++ -Wunused-but-set-parameter test.cpp`, the following
test program reports the following warnings:
test.cpp:8:14: warning: parameter 'a' set but not used
[-Wunused-but-set-parameter]
void foo(int a, int b, int c) {
^
test.cpp:8:21: warning: parameter 'b' set but not used
[-Wunused-but-set-parameter]
void foo(int a, int b, int c) {
void foo(int a, int b, int c) {
a = 1; // PASS: expect warning, got warning
b += 1; // PASS: expect warning, got warning
c++; // FAIL? expect warning because c++ result unused, got no warning
}
If `b += 1` is considered "setting but not using" b, then shouldn't `c++` also
be considered "setting but not using" parameter c?
I am using Homebrew clang version 13.0.0 on macOS 11.6.
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