https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100742
Bug ID: 100742
Summary: False positive -Wignored-attributes with std::map and
aligned(8) attribute
Product: gcc
Version: 9.3.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: liavonlida at gmail dot com
Target Milestone: ---
Check following code:
////////////////////////////////////////////////////
#include <map>
template <typename Type>
class VecBase
{
typedef __attribute__((aligned(8))) Type value_data;
};
typedef std::map<double, double> test_passed;
struct S1
{
inline void f1(VecBase<const double> p1) {}
};
typedef std::map<double, double> test_failed;
int main()
{
return 0;
}
////////////////////////////////////////////////////
This leads to -Wignored-attributes warning:
<source>:16:32: warning: ignoring attributes on template argument 'const
double' [-Wignored-attributes]
16 | typedef std::map<double, double> test_failed;
|
This looks very strange and false positive.
Could be reproduced with GCC from 6 to 10 versions. GCC 11 is ok with this
code. Other compilers are also ok. I tried on https://godbolt.org/.
