https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105939
Bug ID: 105939
Summary: "warning: anonymous struct declared inside parameter
list will not be visible outside of this definition or
declaration" should have a warning flag attached to it
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: egallager at gcc dot gnu.org
Blocks: 44209
Target Milestone: ---
This is a more specific example of bug 44209. Code taken from here:
https://twitter.com/icculus/status/1536140541200584710
$ cat icculus_twitter_thread.c
#include <stdio.h>
int main(void) {
int x = 0;
do printf("%d\n", x++); while (x < 10);
return 0;
}
const const const static const inline int xx;
xxx();
int xxxx(struct { int a; int b; } x) {}
$ /usr/local/bin/gcc -c -Wall -Wextra -Wshadow -pedantic -Wconversion
-Wold-style-definition -Wold-style-declaration -Wduplicated-branches
-Wduplicated-cond -Wlogical-op -Wnull-dereference -Wc++-compat -Wnested-externs
-Wstrict-prototypes -Wmissing-declarations -Wmissing-prototypes
icculus_twitter_thread.c
icculus_twitter_thread.c:9:7: warning: duplicate 'const' declaration specifier
[-Wduplicate-decl-specifier]
9 | const const const static const inline int xx;
| ^~~~~
icculus_twitter_thread.c:9:13: warning: duplicate 'const' declaration specifier
[-Wduplicate-decl-specifier]
9 | const const const static const inline int xx;
| ^~~~~
icculus_twitter_thread.c:9:1: warning: 'static' is not at beginning of
declaration [-Wold-style-declaration]
9 | const const const static const inline int xx;
| ^~~~~
icculus_twitter_thread.c:9:26: warning: duplicate 'const' declaration specifier
[-Wduplicate-decl-specifier]
9 | const const const static const inline int xx;
| ^~~~~
icculus_twitter_thread.c:9:1: warning: 'inline' is not at beginning of
declaration [-Wold-style-declaration]
9 | const const const static const inline int xx;
| ^~~~~
icculus_twitter_thread.c:9:43: warning: variable 'xx' declared 'inline'
9 | const const const static const inline int xx;
| ^~
icculus_twitter_thread.c:9:43: warning: uninitialized 'const xx' is invalid in
C++ [-Wc++-compat]
icculus_twitter_thread.c:11:1: warning: data definition has no type or storage
class
11 | xxx();
| ^~~
icculus_twitter_thread.c:11:1: warning: type defaults to 'int' in declaration
of 'xxx' [-Wimplicit-int]
icculus_twitter_thread.c:11:1: warning: function declaration isn't a prototype
[-Wstrict-prototypes]
icculus_twitter_thread.c:13:10: warning: anonymous struct declared inside
parameter list will not be visible outside of this definition or declaration
13 | int xxxx(struct { int a; int b; } x) {}
| ^~~~~~
icculus_twitter_thread.c:13:5: warning: no previous prototype for 'xxxx'
[-Wmissing-prototypes]
13 | int xxxx(struct { int a; int b; } x) {}
| ^~~~
icculus_twitter_thread.c: In function 'xxxx':
icculus_twitter_thread.c:13:35: warning: unused parameter 'x'
[-Wunused-parameter]
13 | int xxxx(struct { int a; int b; } x) {}
| ~~~~~~~~~~~~~~~~~~~~~~~~~^
icculus_twitter_thread.c:13:39: warning: control reaches end of non-void
function [-Wreturn-type]
13 | int xxxx(struct { int a; int b; } x) {}
| ^
icculus_twitter_thread.c: At top level:
icculus_twitter_thread.c:9:43: warning: 'xx' defined but not used
[-Wunused-const-variable=]
9 | const const const static const inline int xx;
| ^~
$
Should I open separate bugs for how the warnings that say "warning: variable
'xx' declared 'inline'" and "warning: data definition has no type or storage
class" don't have flags linked to them as well? Or can we track those here,
too?
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=44209
[Bug 44209] [meta-bug] Some warnings are not linked to diagnostics options
