Question about compiler blacklisting (llvm-gcc for wxWidgets)

[David Strubbe]

If the compilers need to be consistent, then you can use the compilers
portgroup to enforce that.

David

On Wed, Nov 1, 2017 at 10:29 AM, Mojca Miklavec <mojca at macports.org> wrote:

> Hi,
>
> I'm currently trying to fix wxWidgets-3.0 in various ways. One of the
> problems of the latest release is that it compiles fine with both
> clang >= 500 and llvm-gcc. If I blacklist clang < 500 on Lion, it will
> fallback to llvm-gcc which works in principle, but I don't know
> whether it makes more sense to compile with, say, clang 3.4, or with
> llvm-gcc. Suggestions?
>
> The additional complication is that any port which builds against
> wxWidgets needs to use (more or less) the same compiler for both
> compiling wxWidgets and the port that depends on it. Add to that that
> ports that need both perl and wxWidgets probably need a compatible
> compiler for all three?
>
> If I just blacklist one compiler for wxWidgets (but not for the ports
> depending on it), I'll get a build failure on any other port that
> builds against it. That's partly because wxWidgets does some testing
> of compiler features and writes some of the results to the headers
> which are then included in the sources of dependent software. (I
> believe the reason for a failure of clang 425 on 10.7 is just some
> incorrectly implemented test, but I'm not too eager to debug that if I
> can simply switch the complier and get it working.)
>
> At least I'm sure that the build of dependent ports fails if wxWidgets
> is built with a more capable compiler. I'm not sure whether things
> work out of the box if one uses a less capable compiler for compiling
> wxWidgets and then some C++11 capable compiler for a dependent port,
> but I expect problems as well.
>
> What's the proper blacklisting? Since llvm-gcc-4.2 seems to work fine,
> I'm tempted to blacklist llvm-gcc just on Lion and newer, while
> letting 10.6 build with its default compiler (llvm-gcc). I didn't test
> 10.6 yet though. Is that too weird? Does anyone have a better
> suggestion?
>
> Meanwhile I need to debug some weird side effects, like p5-wx trying
> to compile with
>     /opt/local/clang++ -stdlib=libc++-mp-3.4
> for example. I didn't ask it to do anything like that.
>
> Thank you,
>     Mojca
>
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