Re: scm_dynwind_block_asyncs() and scm_dynwind_unblock_asyncs() won't link

[Chris Vine <chris@cvine.freeserve.co.uk>]

On Sat, 3 May 2014 20:50:56 +0100
Chris Vine <chris@cvine.freeserve.co.uk> wrote:

> Hi,
> 
> I am having a linking problem with scm_dynwind_block_asyncs() and
> scm_dynwind_unblock_asyncs() with guile-2.0.11, but only with those
> two functions. This can be reduced to the following test case:
> 
>   #include <libguile.h>
> 
>   int main(void)
>   {
>     scm_dynwind_block_asyncs();
>     scm_dynwind_unblock_asyncs();
>     return 0;
>   }
> 
> when compiled with:
> 
>   gcc -o guile-test `pkg-config guile-2.0 --cflags --libs`
> guile-test.c
> 
> they fail to link for me, emitting:
> 
>   /tmp/cc3wakQm.o: In function `main':
>   guile-test.c:(.text+0x12): undefined reference to
> `scm_dynwind_block_asyncs' guile-test.c:(.text+0x17): undefined
> reference to `scm_dynwind_unblock_asyncs' collect2: error: ld
> returned 1 exit status
> 
> However, all other guile functions appear to link correctly, and
> 
>   nm -Ca /usr/lib/libguile-2.0.so | grep scm_dynwind.*asyncs
> 
> shows the two functions are in the shared library file.  I am at a
> complete loss.  Can someone test their own installations of
> guile-2.0.11 and/or tell me what I might be doing wrong?

If anyone is reading this on the archive, the problem is that
guile-2.0's scm_c_call_with_blocked_asyncs,
scm_c_call_with_unblocked_asyncs, scm_dynwind_block_asyncs and
scm_dynwind_unblock_asyncs are not explicitly marked as exported in
async.h.  I have sent a trivial patch to the guile-devel mailing list.

Chris