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Use __ISO_C_VISIBLE, as opposed to testing __STDC_VERSION__.
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Authored by ed on Jun 22 2017, 3:03 PM.
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Summary

FreeBSD's C library uses STDC_VERSION to determine whether the
compiler provides language features specific to a certain version of the
C standard. __ISO_C_VISIBLE is used to specify which library features
need to be exposed.

max_align_t currently uses STDC_VERSION, even though it should be
using __ISO_C_VISIBLE to remain consistent with the rest of the headers
in include/.

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rS FreeBSD src repository - subversion
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