On Mon, Mar 11, 2019 at 01:16:07PM -0400, Tom Callaway wrote:
> I spent some time this weekend trying to get Chromium 72 building on
> Fedora, but I kept running into a C++ issue that I was not able to resolve.
> This happened with gcc-9.0.1-0.8.fc30.x86_64 and gcc-8.3.1-2.fc29.x86_64.
Can you please provide preprocessed source + g++ command line options,
from the snippets it is hard to see what's going on.
>From the description it seems maybe like:
template <int N>
struct S {
static constexpr int a[2] = { 1, 2 };
};
static_assert (&S<0>::a[1] != nullptr);
which g++ accepts for -std=c++{11,14} but rejects for -std=c++{17,2a} when
S<0>::a is an inline variable. I think we have a similar
http://gcc.gnu.org/PR89074 . The middle-end punts here and doesn't optimize
the != NULL to true because it is address of a comdat variable and thus it
in the end could come up from any other TU. Though perhaps in these cases
the standard gives us some guarantees.
Jakub
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