configure SCM_SINGLES

configure SCM_SINGLES

[Kevin Ryde]

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I applied a change,

        * configure.in (SCM_SINGLES): Use AC_CHECK_SIZEOF(float), to
        eliminated guess-yes when cross compiling.

I left the test as sizeof(float)<=sizeof(long), because that's what
the AC_TRY_RUN did, though the template and warning message say "same
size".

Is SCM_SINGLES still used?  It didn't show up in a grep, and
libguile/ChangeLog-2000 talks about removing conditionals using it.


[-- Attachment #2: configure.in.singles.diff --]
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--- configure.in.~1.214.~	2003-05-12 08:06:15.000000000 +1000
+++ configure.in	2003-05-12 08:50:01.000000000 +1000
@@ -792,25 +792,11 @@
 	   [],
            [AC_MSG_WARN(Guessing that stack grows down -- see scmconfig.h)])
 
-AH_TEMPLATE([SCM_SINGLES],
-  [Define this if floats are the same size as longs.])
-
-AC_CACHE_CHECK([whether floats fit in longs], guile_cv_type_float_fits_long,
-    [AC_TRY_RUN([main () { exit (sizeof(float) > sizeof(long)); }],
-		[guile_cv_type_float_fits_long=yes],
-		[guile_cv_type_float_fits_long=no],
-		[guile_cv_type_float_fits_long=guess-yes])])
-case $guile_cv_type_float_fits_long in
-  "yes" )
-    AC_DEFINE(SCM_SINGLES)
-  ;;
-  "guess-yes" )
-    AC_DEFINE(SCM_SINGLES)
-    AC_MSG_WARN([guessing that sizeof(long) == sizeof(float)])
-    AC_MSG_WARN([see SCM_SINGLES in scmconfig.h.in])
-  ;;
-esac
-
+AC_CHECK_SIZEOF(float)
+if test "$ac_cv_sizeof_float" -le "$ac_cv_sizeof_long"; then
+    AC_DEFINE(SCM_SINGLES, 1, 
+              [Define this if floats are the same size as longs.])
+fi
 
 AC_MSG_CHECKING(for struct linger)
 AC_CACHE_VAL(scm_cv_struct_linger,

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Re: configure SCM_SINGLES

[Rob Browning]

Kevin Ryde <user42@zip.com.au> writes:

> I left the test as sizeof(float)<=sizeof(long), because that's what
> the AC_TRY_RUN did, though the template and warning message say "same
> size".
>
> Is SCM_SINGLES still used?  It didn't show up in a grep, and
> libguile/ChangeLog-2000 talks about removing conditionals using it.

Good question.  That's on my list of "things to ask about" too.

-- 
Rob Browning
rlb @defaultvalue.org, @linuxdevel.com, and @debian.org
Previously @cs.utexas.edu
GPG starting 2002-11-03 = 14DD 432F AE39 534D B592  F9A0 25C8 D377 8C7E 73A4


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Re: configure SCM_SINGLES

[Kevin Ryde]

I wrote:
>
> I applied a change,
>
>         * configure.in (SCM_SINGLES): Use AC_CHECK_SIZEOF(float), to
>         eliminated guess-yes when cross compiling.

Umm, err, I probably should have posted and given a chance for
objections on this, begin a bit more than a typo.  Not that it can't
be easily reverted, but still ...  :)


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