[Bug c++/118923] [15 regression] Wrong code generated for member function pointer call in range-for loop

[ppalka at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118923

Patrick Palka <ppalka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=118856
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2025-02-18
     Ever confirmed|0                           |1
                 CC|                            |jason at gcc dot gnu.org,
                   |                            |ppalka at gcc dot gnu.org

--- Comment #2 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Seems to have started with r15-7508 "c++: -frange-for-ext-temps and reused
temps [PR118856]".

Reduced runtime testcase:

struct A {
        int x[3];
        int* begin() { return x; }
        int* end() { return x+3; }
};

struct Workspace {
        A previousRestrictedMoveArea() { return {1,2,3}; }
        A restrictedMoveArea() { return {1,2,3}; }
        bool inRearrange() {
                return m_inRearrange;
        }

        bool m_inRearrange = false;

        static Workspace _self;
};

Workspace Workspace::_self;

inline Workspace *workspace() {
        return &Workspace::_self;
}

void foo() {
        auto moveAreaFunc = workspace()->inRearrange() ?
&Workspace::previousRestrictedMoveArea :
                &Workspace::restrictedMoveArea;

        for (const int &r : (workspace()->*moveAreaFunc)()) {
        }
}

int main() {
        foo();
}