[SCM] GNU Autoconf source repository branch, master, updated. v2.61a-399-g6893b8b

[Eric Blake]

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- Log -----------------------------------------------------------------
commit 6893b8be8a760345c1af22dad7b7751aa7e87973
Author: Eric Blake <address@hidden>
Date:   Fri Mar 21 13:27:01 2008 -0600

    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>

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog         |    6 ++++++
 THANKS            |    1 +
 doc/autoconf.texi |   15 +++++++++++++++
 3 files changed, 22 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/THANKS b/THANKS
index 84d2cdb..a561cfb 100644
--- a/THANKS
+++ b/THANKS
@@ -139,6 +139,7 @@ Ian Lance Taylor            address@hidden
 Ian Macdonald               address@hidden
 Ian Redfern                 address@hidden
 Ilya Zakharevich            address@hidden
+Ineiev                      address@hidden
 Iohannes m zmoelnig         address@hidden
 J C Fitzgerald              address@hidden
 Jaap Haitsma                address@hidden
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++}.
 


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