http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60287
Bug ID: 60287
Summary: Various issues on -Wformat=
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: chengniansun at gmail dot com
1) Besides "-Wformat=2", gcc accepts any option in the form of
-Wformat=<number>
Based on the manual, gcc only accepts "-Wformat=2", and others such as
"-Wformat=0,1, 3-9" should be invalid. Any undocumented behavior?
2) Is the warning name "[-Wformat=]" in the warning message intended?
$: gcc-trunk -Wformat=3 s.c
s.c: In function ‘main’:
s.c:4:3: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2
has type ‘int’ [-Wformat=]
printf("%s%s", i, i);
^
s.c:4:3: warning: format ‘%s’ expects argument of type ‘char *’, but argument 3
has type ‘int’ [-Wformat=]
$:
3) Is the column number information correct in the warning message? Should the
warning refer to the location of the problematic argument, or the function
call? Currently clang warns at the argument.
$: clang-trunk -Wall s.c
s.c:4:18: warning: format specifies type 'char *' but the argument has type
'int' [-Wformat]
printf("%s%s", i, i);
~~ ^
%d
s.c:4:21: warning: format specifies type 'char *' but the argument has type
'int' [-Wformat]
printf("%s%s", i, i);
~~ ^
%d
2 warnings generated.
$
