On Wed, 15 Mar 2023 at 22:14, Ben Beasley <code@xxxxxxxxxxxxxxxxxx> wrote:
Thank you for prompting me to look at this more closely. A quick investigation reveals:
“Abseil libraries require C++14 as the current minimum standard. When compiled with C++17 (either because it is the compiler's default or explicitly requested), then Abseil requires C++17.”
https://github.com/abseil/abseil-cpp/blob/20230125.1/CMake/AbseilHelpers.cmake#L291
The abseil-cpp package in Fedora has been compiled as C++17 for some time—at first explicitly, but this would also now be the default if the spec file did not configure a particular standard—so it seems dependent packages already technically needed C++17, and it is mere happenstance that this particular release is revealing incompatibilities.
I'm not sure if that's true, see my other email which crossed with yours. In the previous release absl::string_view would work for both C++14 and C++17, because USE_STD_STRING_VIEW was defined to 2, so adapted to the headers that included it.
In the new release it is hardcoded to only work for C++17. That seems like a new change in the new version, not something that was already present.
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