Public bug reported:
When compiling the following file:
#include <stdio.h>
extern inline __attribute__((gnu_inline)) FILE *fopen(const char *filename,
const char *mode) {
return NULL;
}
GCC produces the following warning:
bug.c:2:1: warning: ignoring attribute ‘gnu_inline’ because it conflicts with
attribute ‘noinline’ [-Wattributes]
2 | extern inline __attribute__((gnu_inline)) FILE *fopen(const char
*filename, const char *mode) {
| ^~~~~~
However, compiling with -E shows that the stdio declaration doesn't have
a noinline attribute:
extern FILE *fopen (const char *__restrict __filename,
const char *__restrict __modes)
__attribute__ ((__malloc__)) __attribute__ ((__malloc__ (fclose, 1))) ;
At best, the warning is giving an incorrect reason. At worst, it's
ignoring a valid gnu_inline attribute.
I tried with --no-builtin as well, in case there is a hidden builtin
declaration, but the message is the same.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: gcc 4:13.2.0-7ubuntu1
ProcVersionSignature: Ubuntu 6.8.0-51.52-generic 6.8.12
Uname: Linux 6.8.0-51-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sat Jan 18 10:37:31 2025
InstallationDate: Installed on 2024-07-01 (201 days ago)
InstallationMedia: Ubuntu 24.04 LTS "Noble Numbat" - Release amd64 (20240424)
SourcePackage: gcc-defaults
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: gcc-defaults (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble wayland-session
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https://bugs.launchpad.net/bugs/2095225
Title:
Incorrect warning about ignoring attribute gnu_inline
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