Re: Fix for cross compilation

What about our threading configure test? That doesn't allow cross
compilation either, does it?

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Peter Eisentraut wrote:
> In 8.0, PostgreSQL lost its previously postulated ability to be
> cross-compiled and it turns out some people actually used that, so
> here's an attempt to fix it.
>
> The problem is that the program zic in src/timezone/ is built and run
> during the build process, which doesn't work if it's compiled by a
> cross-compiler.
>
> The standard way to go about this in autotools land (references: gcc,
> binutils) is to introduce a second variable CC_FOR_BUILD that is set to
> a native compiler. There is no particular way to determine this
> variable; it's passed by the user or defaults to $CC. This variable is
> then used in place of CC to build programs that are compiled and run
> during the build.
>
> The problem is that native compilations cannot rely on things that the
> build system normally provides because the tests are run for the target
> system, not the build system. It can be assumed that the compilers are
> of the same kind, so using CFLAGS etc. is OK. But one cannot rely on
> libraries for example without entering a world of pain. Since most
> programs that need native compilation are usually some small conversion
> programs, this generally works out well anyway.
>
> Attached is a patch that implements that principle for zic. zic can no
> longer use libpgport, but the only thing it seems to use from there is
> strerror() and I like to think that we can get away with that.
>
> I haven't actually tried this out with a cross compilation since I'm not
> set up for it, so if someone has an environment available, please give
> this a try.
>
> Comments?
>
> --
> Peter Eisentraut
> http://developer.postgresql.org/~petere/

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