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List:       boost-build
Subject:    Re: [Boost-build] adding tests conditional on compiler's C++11 support
From:       John Maddock <jz.maddock () googlemail ! com>
Date:       2016-11-17 19:35:54
Message-ID: 03f528ba-0bb7-4047-ea38-e573e87d2c5c () gmail ! com
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> One particular case illustrates the problem.  See the test matrix 
> http://www.boost.org/development/tests/develop/developer/serialization.html 
> the test columns Sandia-darwin-c++11 and Sandia-darwin.  Also of 
> interest is the adjacent column timber-macOS.  All tests are shown 
> being run with compiler version 4.2.1.  (I'll leave aside the question 
> as what difference the clang part of the compiler name means.
>
> One column shows test_forward... failing with the above test.  It gets 
> the value of BOOST_NO_CXX11_HDR_FORWARD_LIST from the config file. 
> While the bjam processor gets the "requires" from ...?  It seems they 
> are not getting these from the same source and that they are getting 
> different values.  In particular it looks like Jam is testing for the 
> existence of <forward_list> which my program is checking config.hpp 
> and that these are out of sync.

Just catching up on this... this is *not* gcc, it's Clang 7 with libc++, 
can someone with this combination installed on Darwin let me know 
whether <forward_list> really is fully supported even in C++03 mode?

Thanks, John.

PS To Robert, best to code your program as:

#ifndef BOOST_NO_CXX11_HDR_FORWARD_LIST

// main tests go here...

#else

int main() { return 0; }

#endif

Then if you still add the config-checks to the Jamfile to prevent 
unnecessary tests being built, you should have all the bases covered.
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