Re: Guile on Mac OS X

[Rob Browning]

Michael Tuexen <address@hidden> writes:

> ### GUILE_FUNC_DECLARED(function, headerfile)
> ### Check for a declaration of FUNCTION in HEADERFILE; if it is
> ### not there, #define MISSING_FUNCTION_DECL.
> AC_DEFUN(GUILE_FUNC_DECLARED, [
>    AC_CACHE_CHECK(for $1 declaration, guile_cv_func_$1_declared,
>      AC_EGREP_HEADER($1, $2,
>                      guile_cv_func_$1_declared=yes,
>                      guile_cv_func_$1_declared=no))
>    if test [x$guile_cv_func_]$1[_declared] = xno; then
>      AC_DEFINE([MISSING_]translit($1, [a-z], [A-Z])[_DECL])
>    fi
> ])
>
> GUILE_FUNC_DECLARED(strptime, time.h)
> GUILE_FUNC_DECLARED(sleep, unistd.h)
> GUILE_FUNC_DECLARED(usleep, unistd.h)

Looks like usleep and sleep are in unistd.h on (most?) platforms, but
on yours they're in time.h.

Unfortunately GUILE_FUNC_DECLARED may not make it easy to test a
second location since it looks like if the function isn't found the
first time, it takes actions that wouldn't be undone by a later
successful test.

One option would be to change GUILE_FUNC_DECLARED to allow multiple
headers like this:

  GUILE_FUNC_DECLARED([sleep], [unistd.h time.h])

or can m4, etc. handle ... args?

  GUILE_FUNC_DECLARED([sleep], [unistd.h], [time.h])

I'll look in to a solution of some kind unless someone else knows how
to write this up off the top of their head.

Alternately I suppose we could use two functions, one to check a
header and one to call later to take action if none of the checks
succeeded:

  GUILE_CHECK_HEADER_FOR_FUNC([sleep], [unistd.h])
  GUILE_CHECK_HEADER_FOR_FUNC([sleep], [time.h])
  GUILE_CHECK_FOR_MISSING_FUNC_DECLARATION([sleep])

not a big deal to me either way.

-- 
Rob Browning
rlb @defaultvalue.org, @linuxdevel.com, and @debian.org
Previously @cs.utexas.edu
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