On Fri, 6 Mar 2026 at 10:49, Nathan Myers <[email protected]> wrote:
>
> [This is untested. How do I find g++.old-deja/g++.martin/bitset1.C ?]
With /usr/bin/find :-)
For the compiler tests the general rule is to find the test under
gcc/testsuite then locate the .exp file that runs it, which will be
first .exp file you find if you look in . then .. then ../.. etc.
So for gcc/testsuite/g++.old-deja/g++.martin/bitset1.C that's
gcc/testsuite/g++.old-deja/old-deja.exp
So then you use RUNTESTFLAGS=old-deja.exp=bitset1.C
The 'make check-g++' target limits it to the C++ tests, but 'make
check' works too (just slower).
>
> C++11 forbids a compound statement, as seen in the definition of
> __glibcxx_assert(), in a constexpr function. This patch implements
> the assertion in `bitset<>::operator[] const` directly for C++11,
> albeit less ergonomically.
>
> libstdc++-v3/ChangeLog:
> * include/std/bitset (operator[]() const): Customize bounds
> check for C++11 case.
> ---
> libstdc++-v3/include/std/bitset | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/libstdc++-v3/include/std/bitset b/libstdc++-v3/include/std/bitset
> index eb200ab9246..a23545320ee 100644
> --- a/libstdc++-v3/include/std/bitset
> +++ b/libstdc++-v3/include/std/bitset
> @@ -1298,8 +1298,16 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
> _GLIBCXX_CONSTEXPR bool
> operator[](size_t __position) const
> {
> +#if __cplusplus != 201103L
> __glibcxx_assert(__position < _Nb);
> return _Unchecked_test(__position);
> +#elif defined(_GLIBCXX_ASSERTIONS)
> + // C++11 forbids a compound stmt in a constexpr function.
> + return __position < _Nb ? _Unchecked_test(__position)
> + : (__builtin_trap(), bool());
I think I'd prefer just 'false' instead of 'bool()'
OK with that change after tests pass, thanks.
> +#else
> + return _Unchecked_test(__position);
> +#endif
> }
> ///@}
>
> --
> 2.52.0
>
