is this explicit external declaration more than just the word "extern"?
Jan Schiefer <[email protected]> wrote:
>Hi Richard,
>
>thank you very much for putting the CMake build together, this is going
>
>to help portability tremendously. I have tried, and mostly succeeded,
>to
>build codec2-dev on WIndows7 using Microsoft VisualStudio 2010. I know
>many here are not enthusiastic about this environment, but getting that
>
>to work certainly helps to work through some cross-platform issues.
>Here's what I have found:
>
>A config.h file is needed to deal with some missing functionality in
>the
>Windows platform. I am able to make this work for both autoconf and
>CMake by using different input file names for the different
>environments
>and the same output file name. The HAVE_XXX mechanisms are pleasingly
>similar, so the #include works with output from either CMake or
>autoconf.
>
>On a related note, the list of include files and functions checked for
>is inconsistent between autoconf and CMake.
>
>VisualStudio doesn't have a round() function. Easy enough.
>
>It also doesn't have getopt(), which is used in c2sim. I have found a
>"Microsoftized" version of glibc's getopt() here:
>http://www.ludvikjerabek.com/software. This is under LGPL, so the
>license is compatible. This raises the question where in the source
>tree
>platform dependent source files should go?
>
>Windows requires an explicit declaration which entry points are to be
>made visible ("exported") from a shared library. I solved this with an
>external declaration (DEF file). Since I did this, I have also noted
>that some of the "public" functions in the codec2 library are decorated
>
>with CODEC2_WIN32SUPPORT macros, so that may be the preferable
>approach?
>This would work for everything other than c2sim, which needs access to
>some of the more private parts of the codec2 library. Not sure what to
>do about that one.
>
>I was going to ask about the codebook files also, but that has been
>covered elsewhere.
>
>Now, for next steps: Any comments on the questions above would be
>appreciated. I need to finish up the integration of the getopt() stuff
>and do a little more testing, otherwise I will very soon be ready to
>provide patches, if desired. I should probably wait for the next set of
>
>changes and merge those out first? Seem you are hard at work.
>
>Eventually I will try the same with fdmdv2. I can help with OSX also,
>if
>nobody else is working on that.
>
>Best regards,
> Jan, ac7td, dl5ue
>
>
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