https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87611
Bug ID: 87611
Summary: Cannot suppress warning with #pragma GCC diagnostic
warning "-Wabi=12"
Product: gcc
Version: 8.2.1
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
Target Milestone: ---
struct empty { };
#pragma GCC diagnostic warning "-Wabi=12"
void f(empty, int) { }
Compiling this with -Wabi=11 warns, even though the pragma should cause
-Wabi=12 to be used, and so not warn:
wabi.cc: In function 'void f(empty, int)':
wabi.cc:3:6: warning: empty class 'empty' parameter passing ABI changes in
-fabi-version=12 (GCC 8) [-Wabi]
3 | void f(empty, int) { }
| ^
It's necessary to completely disable -Wabi warnings with
#pragma GCC diagnostic ignored "-Wabi"
By contrast, the following does suppress the warning about the PR c++/51322
mangling change:
#pragma GCC diagnostic warning "-Wabi=6"
template<class T> struct Ident { typedef T type; };
template<template<class...>class E,class...F> struct A{typedef E<F...> type;};
typedef A<Ident,int> B;
void f(B){}
Why doesn't it work for the first case?
