Re: [boost] Re: [Config] Testing instructions for compiler vendors

From: David Abrahams (dave_at_[hidden])
Date: 2002-12-18 16:24:28

David Abrahams <dave_at_[hidden]> writes:
>
> I'd much prefer:
>     BOOST_WORKAROUND(__SUNPRO_CC, BOOST_LATEST_VERSION(0x530))
>
> Which I think is easily achievable, no?
>
>     # define BOOST_WORKAROUND(symbol, test)  (symbol != 0) && (1 % ((symbol test) + 1))
>     # ifdef BOOST_DETECT_OUTDATED
>     #  define BOOST_LATEST_VERSION(value)  >value?-1:1
>     # else
>     #  define BOOST_LATEST_VERSION(value) != 0
>     # endif 
>
>     int x = 0;
>
>     # if BOOST_WORKAROUND(COMPILER_VERSION, < 20)
>     int y = 0;
>     # elif BOOST_WORKAROUND(COMPILER_VERSION, BOOST_LATEST_VERSION(20))
>     int z = 0;
>     # endif 
>
> This seems to work for everything but metrowerks, which says:
>
>     ### mwcc Compiler:
>     #    File: foo.cpp
>     # ----------------
>     #      16: ( 21 != 0) && (1 % (( 21  >20?-1:1) + 1))
>     #   Error: ^
>     #   expression syntax error
>
>
> :(
>
> If anyone can come up with a workaround, I'd be psyched!

This does it:

    # define BOOST_WORKAROUND(symbol, test)  (symbol != 0) && (1 % (( (symbol test) ) + 1))
    # ifdef BOOST_DETECT_OUTDATED_WORKAROUNDS
    #  define BOOST_OPEN_PAREN (
    #  define BOOST_CHECKED_AT(value)  > value) ?(-1): BOOST_OPEN_PAREN 1
    # else
    #  define BOOST_CHECKED_AT(value) != 0
    # endif 

Now:

    # if BOOST_WORKAROUND(BOOST_MSVC, BOOST_CHECKED_AT(1300))

Seems to work as desired.

Any objections?  I think I'm going to modify
boost/detail/workaround.hpp now.

-- 
                       David Abrahams
   dave_at_[hidden] * http://www.boost-consulting.com
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