https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101775
Bug ID: 101775
Summary: G++ drops namespace prefix of argument in the
referenced function symbol
Product: gcc
Version: 11.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: mytbk920423 at gmail dot com
Target Milestone: ---
When g++ builds following code, the function foo() referenced by this program
is compiled to symbol ``foo(VecReg&)``, which should be ``foo(MyISA::VecReg&)``
with the namespace prefix. This results in a linking error.
```
// test.cc
#include <cstdint>
#include <cstdlib>
namespace MyISA {
typedef struct {
uint8_t data[64];
} VecReg;
}
void foo(MyISA::VecReg &v);
using MyISA::VecReg;
class A
{
VecReg v;
public:
void test();
};
typedef MyISA::VecReg VecReg;
void A::test()
{
foo(v);
}
int main()
{
A a;
a.test();
}
```
```
// foo.cc
#include <cstdint>
namespace MyISA {
typedef struct {
uint8_t data[64];
} VecReg;
}
void foo(MyISA::VecReg &v)
{
v.data[0] = 42;
}
```
$ g++ -c test.cc ; g++ -c foo.cc ; g++ -o main test.o foo.o
/usr/bin/ld: test.o: in function `A::test()':
test.cc:(.text+0x14): undefined reference to `foo(VecReg&)'
$ nm -C test.o foo.o
test.o:
U _GLOBAL_OFFSET_TABLE_
000000000000001b T main
U __stack_chk_fail
U foo(VecReg&)
0000000000000000 T A::test()
foo.o:
0000000000000000 T foo(MyISA::VecReg&)
