Re: Guile on Mac OS X

[Michael Tuexen <Michael.Tuexen@lurchi.franken.de>]

Rob,

see my comments below.

Best regards
Michael

On Montag, Aug 5, 2002, at 07:24 Europe/Berlin, Rob Browning wrote:

> Michael Tuexen <Michael.Tuexen@lurchi.franken.de> 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.
>
No, see the the following output (from an earlier e-mail):

[Powerbook:~/guile-1.5.6] tuexen% grep strptime /usr/include/time.h
char *strptime __P((const char *, const char *, struct tm *));
[Powerbook:~/guile-1.5.6] tuexen% grep sleep /usr/include/unistd.h
unsigned int     sleep __P((unsigned int));
int      usleep __P((unsigned int));
[Powerbook:~/guile-1.5.6] tuexen% grep usleep /usr/include/unistd.h
int      usleep __P((unsigned int));
[Powerbook:~/guile-1.5.6] tuexen%

They are in /usr/include/unistd.h.

I have the impression that grep can find it but AC_EGREP_HEADER fails
to find it. I have no idea why. For strptime everything works as 
expected.
> 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.
>
We do not need this.
> -- 
> Rob Browning
> rlb @defaultvalue.org, @linuxdevel.com, and @debian.org
> Previously @cs.utexas.edu
> GPG=1C58 8B2C FB5E 3F64 EA5C  64AE 78FE E5FE F0CB A0AD
>
>
--
Michael.Tuexen@micmac.franken.de


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