https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117127
Bug ID: 117127
Summary: Feature request: Warning on useless 'const' in a
function declaration
Product: gcc
Version: 14.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: rdiez-2006 at rd10 dot de
Target Milestone: ---
Sometimes, I forget to remove useless 'const' modifiers in function
declarations in header files when copying the function prototype from the .cpp
file. A simplified example is:
file.h:
// Non-defining function declaration ("prototype" in C terminology).
int f ( const int a ); // 'const' is useless here.
file.cpp:
// Function definition.
int f ( const int a ) // 'const' does make sense here.
{
return a;
}
I would like GCC to issue warnings for such useless 'const' modifiers in
function declarations (not definitions). At the very least, it would save some
head scratching during code reviews.
Apparently, clang-tidy has option 'readability-avoid-const-params-in-decls' for
such a warning:
https://clang.llvm.org/extra/clang-tidy/checks/readability/avoid-const-params-in-decls.html
There was a recent discussion about this in the mailing list:
Warning on useless 'const' in a function declaration
Mon Oct 7 14:24:38 GMT 2024
https://gcc.gnu.org/pipermail/gcc-help/2024-October/143768.html
