https://gcc.gnu.org/bugzilla/show_bug.cgi?id=45977
Jörn Heusipp <manx-bugzilla at problemloesungsmaschine dot de> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |manx-bugzilla@problemloesun
| |gsmaschine.de
--- Comment #8 from Jörn Heusipp <manx-bugzilla at problemloesungsmaschine dot
de> ---
I am seeing the same warning, however in C++, when trying to set DJGPP's CRT
startup flags (see <http://www.delorie.com/djgpp/v2faq/faq18_9.html>):
```
manx@appendix:~/tmp$ cat djgpp-main.cpp
#include <crt0.h>
extern "C" int _crt0_startup_flags = 0 | _CRT0_FLAG_LOCK_MEMORY;
int main(int argc, char * argv[]) {
_crt0_startup_flags &= ~_CRT0_FLAG_LOCK_MEMORY;
static_cast<void>(argc);
static_cast<void>(argv);
return 0;
}
manx@appendix:~/tmp$ i386-pc-msdosdjgpp-g++ -c -std=gnu++17 -O2 -Wall -Wextra
-Wpedantic djgpp-main.cpp
djgpp-main.cpp:2:16: warning: '_crt0_startup_flags' initialized and declared
'extern'
2 | extern "C" int _crt0_startup_flags = 0 | _CRT0_FLAG_LOCK_MEMORY;
| ^~~~~~~~~~~~~~~~~~~
manx@appendix:~/tmp$
```
minimal test case:
```
manx@appendix:~/tmp$ cat warn.cpp
extern "C" {
extern int foo;
}
extern "C" int foo = 23;
manx@appendix:~/tmp$ g++ -c -std=c++17 -O2 -Wall -Wextra -Wpedantic warn.cpp
warn.cpp:4:16: warning: ‘foo’ initialized and declared ‘extern’
4 | extern "C" int foo = 23;
| ^~~
manx@appendix:~/tmp$
```
also happens with no -W flags:
```
manx@appendix:~/tmp$ g++ -c -std=c++17 -O2 warn.cpp
warn.cpp:4:16: warning: ‘foo’ initialized and declared ‘extern’
4 | extern "C" int foo = 23;
| ^~~
```
However, I am not seeing the warning in C code:
```
manx@appendix:~/tmp$ cat warn.c
extern int foo;
int foo = 23;
manx@appendix:~/tmp$ gcc -c -std=c17 -O2 -Wall -Wextra -Wpedantic warn.c
manx@appendix:~/tmp$
```
I would really appreciate an option to disable this warning in C++.
I am not 100% sure if my issue is really identical, but it certainly looks
related.
Also, as the original issue was about C, do you want me to report a separate
issue for C++?
GCC versions:
manx@appendix:~/tmp$ gcc --version
gcc (Debian 11.2.0-18) 11.2.0
manx@appendix:~/tmp$ i386-pc-msdosdjgpp-gcc --version
i386-pc-msdosdjgpp-gcc (GCC) 10.3.0
