https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71863
Bug ID: 71863
Summary: wrong column location in -Wformat in C++
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
When compiled in C mode, the following test emits warnings that point at each
of the problem directives:
$ cat xyz.c && /build/gcc-trunk-svn/gcc/xgcc -B /build/gcc-trunk-svn/gcc -S
-Wformat xyz.c
void f (void)
{
__builtin_printf ("%s%s", 0, 0);
}
xyz.c: In function ‘f’:
xyz.c:3:23: warning: format ‘%s’ expects argument of type ‘char *’, but
argument 2 has type ‘int’ [-Wformat=]
__builtin_printf ("%s%s", 0, 0);
^
xyz.c:3:25: warning: format ‘%s’ expects argument of type ‘char *’, but
argument 3 has type ‘int’ [-Wformat=]
__builtin_printf ("%s%s", 0, 0);
^
However, when compiled in C++ mode, the column information is wrong:
$ cat xyz.c && /build/gcc-trunk-svn/gcc/xgcc -B /build/gcc-trunk-svn/gcc -S
-Wformat -xc++ xyz.c
void f (void)
{
__builtin_printf ("%s%s", 0, 0);
}
xyz.c: In function ‘void f()’:
xyz.c:3:33: warning: format ‘%s’ expects argument of type ‘char*’, but argument
2 has type ‘int’ [-Wformat=]
__builtin_printf ("%s%s", 0, 0);
^
xyz.c:3:33: warning: format ‘%s’ expects argument of type ‘char*’, but argument
3 has type ‘int’ [-Wformat=]
The same problem occurs with other directives. I found a long discussion of
some of the issues in bug 52952 but based on the patches referenced from there
it looks like they have been resolved (as least for C).
