[BUG]: pybind11 broken with the default gcc on ubuntu-trusty, linuxmint-17
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Problem description
In the SageMath 9.5 development series we have just upgraded to pybind11 2.7.1 and have noticed that building scipy 1.6.3 now fails with the default compilers on the platforms linuxmint-17 (gcc 4.8.4-2ubuntu1~14.04.3) and ubuntu-trusty (gcc 4.8.4-2ubuntu1~14.04.4). pybind11's README still claims "GCC 4.8 or newer" is supported, so this seems to be a regression.
Likely caused by #2956 . The complicated condition for __GLIBCXX__,
#if defined(__GLIBCXX__) && (__GLIBCXX__ < 20150422 || __GLIBCXX__ == 20150623 || __GLIBCXX__ == 20150626 || __GLIBCXX__ == 20160803)
not fully explained in that PR, misses the value on the two failing platforms, which is 20150426.
Looks like the pybind11 CI does not catch this -- you test centos-7, which uses gcc 4.8.5 (__GLIBCXX__ = 20150623), which works.
Tracked in https://trac.sagemath.org/ticket/32515
Reproducible example code
No response
Closed by #3270