For old gcc versions BOOST_MP11_HAS_TEMPLATE_AUTO isn't set

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
35/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
cpp
Domain
compilers

Research direction

Start by locating where BOOST_MP11_HAS_TEMPLATE_AUTO is defined and compare its feature-test checks with the linked Boost.Spirit implementation. Verify the behavior with GCC 7.1–8.2 and confirm that the macro is set when __cpp_template_auto is available; done means the compatibility check works for those versions.

Written by the indexing model from the issue text.

Description

Old versions of gcc (7.1-8.2) don't define __cpp_nontype_template_parameter_auto but only __cpp_template_auto. Because of that BOOST_MP11_HAS_TEMPLATE_AUTO doesn't get set even though those versions support it. spirit checks both (https://github.com/boostorg/spirit/blob/59515f0e56aebdf958eadab30be99cac8872e723/include/boost/spirit/home/x3.hpp#L19). Would this make sense for mp11 too?

Dominant language
C++
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