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From: "magnus.hegdahl at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/112795] New: [C++>=14] ICE pragma GCC unroll (n)
 cxx_eval_constant_expression
Date: Thu, 30 Nov 2023 23:20:05 +0000
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X-Bugzilla-Version: 8.1.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112795

            Bug ID: 112795
           Summary: [C++>=3D14] ICE pragma GCC unroll (n)
                    cxx_eval_constant_expression
           Product: gcc
           Version: 8.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: magnus.hegdahl at gmail dot com
  Target Milestone: ---

Compiling the following code with GCC >=3D 8.1 (when #pragma GCC unroll was
added), and -std=3Dc++14 or higher results in an internal compiler error:
```
constexpr int n =3D 1;
template <class =3D void>
void f() {
#pragma GCC unroll(n)
    for (int i =3D 0; i !=3D n; ++i) {
    }
}
```

It does not fail if f is not a template, if n is not parenthesized, or if u=
sing
-std=3Dc++11.=