Re: Implementation of `AC_COMPUTE_INT'

[Eric Blake]

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According to Ineiev on 3/21/2008 12:21 AM:
|  --- Ralf Wildenhues <address@hidden> wrote:
|> For example:
|>
|> # We temporarily set cross-compile mode to force AC_COMPUTE_INT
|> # to use the slow link-only method
|> save_cross_compiling=$cross_compiling
|> AC_COMPUTE_INT([...])
|> cross_compiling=$save_cross_compiling
|
| Thank you.
|
| Or there is another manual documenting this?

Thanks for the suggestion.  I'm adding this (the fixed version) to the manual.

I would like to add attribution in THANKS; would you prefer something
longer than "Ineiev" as your name?

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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>From 339f0dc22e16124b3ef27bff5ea5668b31d4ff20 Mon Sep 17 00:00:00 2001
From: Eric Blake <address@hidden>
Date: Fri, 21 Mar 2008 13:27:01 -0600
Subject: [PATCH] Document more uses of $cross_compiling.

* doc/autoconf.texi (Runtime): Document that a temporary override
is permissible.
* THANKS: Update.
Reported by Ineiev, example by Ralf Wildenhues.

Signed-off-by: Eric Blake <address@hidden>
---
 ChangeLog         |    6 ++++++
 doc/autoconf.texi |   15 +++++++++++++++
 2 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 97e8ddc..ef48fbf 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,11 @@
 2008-03-21  Eric Blake  <address@hidden>
 
+       Document more uses of $cross_compiling.
+       * doc/autoconf.texi (Runtime): Document that a temporary override
+       is permissible.
+       * THANKS: Update.
+       Reported by Ineiev, example by Ralf Wildenhues.
+
        Don't swallow $1 in textual local variables.
        * lib/m4sugar/m4sugar.m4 (m4_combine): Don't use overquoting and
        expansion of text arguments, as that swallows $1.
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 0710397..a32e779 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -8371,6 +8371,21 @@ you can test whether the shell variable 
@code{cross_compiling} is set to
 @samp{yes}, and then use an alternate method to get the results instead
 of calling the macros.
 
+It is also permissible to temporarily assign to @code{cross_compiling}
+in order to force tests to behave as though they are in a
+cross-compilation environment, particularly since this provides a way to
+test your @var{action-if-cross-compiling} even when you are not using a
+cross-compiler.
+
address@hidden
+# We temporarily set cross-compile mode to force AC_COMPUTE_INT
+# to use the slow link-only method
+save_cross_compiling=$cross_compiling
+cross_compiling=yes
+AC_COMPUTE_INT(address@hidden)
+cross_compiling=$save_cross_compiling
address@hidden example
+
 A C or C++ runtime test should be portable.
 @xref{Portable C and C++}.
 
-- 
1.5.4