relax cross-tools warning

[Eric Blake]

Based on the recent thread (with a poor subject line), what does everyone think 
about applying this patch?

From: Eric Blake <address@hidden>
Date: Tue, 2 Sep 2008 16:28:31 -0600
Subject: [PATCH] Relax tone when warning about cross-compiler names.

* lib/autoconf/programs.m4 (_AC_TOOL_WARN): Support cross-compiles
with poorly named tools; the issue has been reported too many
times in the last four years to pull support.
* doc/autoconf.texi (Specifying Names, Generic Programs): Update
documentation accordingly.
Reported by Josef Tran and others, wording suggested by Ralf
Wildenhues.

Signed-off-by: Eric Blake <address@hidden>
---
 ChangeLog                |   11 +++++++++++
 doc/autoconf.texi        |   21 ++++++++++++---------
 lib/autoconf/programs.m4 |    4 +---
 3 files changed, 24 insertions(+), 12 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index f78c40f..0c9d408 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,14 @@
+2008-09-02  Eric Blake  <address@hidden>
+
+       Relax tone when warning about cross-compiler names.
+       * lib/autoconf/programs.m4 (_AC_TOOL_WARN): Support cross-compiles
+       with poorly named tools; the issue has been reported too many
+       times in the last four years to pull support.
+       * doc/autoconf.texi (Specifying Names, Generic Programs): Update
+       documentation accordingly.
+       Reported by Josef Tran and others, wording suggested by Ralf
+       Wildenhues.
+
 2008-09-01  Eric Blake  <address@hidden>
 
        Improve AC_C_BIGENDIAN.
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 23417b3..1a93e52 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -4034,8 +4034,9 @@ Generic Programs
 @var{path}, or otherwise to @samp{ranlib} if that program exists in
 @var{path}, or to @samp{:} if neither program exists.
 
-In the future, when cross-compiling this macro will @emph{only}
-accept program names that are prefixed with the host type.
+When cross-compiling, this macro will issue a warning if no program
+prefixed with the host type could be found, as this can lead to some
+bugs if the wrong program was selected.
 For more information, see @ref{Specifying Names, , Specifying the
 system type}.
 @end defmac
@@ -4068,8 +4069,9 @@ Generic Programs
 @var{value-if-not-found} is not specified, the value of @var{variable}
 is not changed.  Calls @code{AC_SUBST} for @var{variable}.
 
-In the future, when cross-compiling this macro will @emph{not}
-accept program names that are not prefixed with the host type.
+When cross-compiling, this macro will issue a warning if no program
+prefixed with the host type could be found, as this can lead to some
+bugs if the wrong program was selected.
 @end defmac
 
 @anchor{AC_PATH_PROG}
@@ -4145,8 +4147,9 @@ Generic Programs
 Like @code{AC_CHECK_TOOL}, but set @var{variable} to the absolute
 name of the program if it is found.
 
-In the future, when cross-compiling this macro will @emph{not}
-accept program names that are not prefixed with the host type.
+When cross-compiling, this macro will issue a warning if no program
+prefixed with the host type could be found, as this can lead to some
+bugs if the wrong program was selected.
 @end defmac
 
 
@@ -17731,9 +17734,9 @@ Specifying Names
 ./configure CC=m68k-coff-gcc
 @end example
 
-In the future, when cross-compiling Autoconf will @emph{not}
-accept tools (compilers, linkers, assemblers) whose name is not
-prefixed with the host type.  The only case when this may be
+When cross-compiling, Autoconf will warn about any
+tools (compilers, linkers, assemblers) whose name is not
+prefixed with the host type.  A typical case when this may be
 useful is when you really are not cross-compiling, but only
 building for a least-common-denominator architecture: an example
 is building for @code{i386-pc-linux-gnu} while running on an
diff --git a/lib/autoconf/programs.m4 b/lib/autoconf/programs.m4
index f2245fb..63f8a13 100644
--- a/lib/autoconf/programs.m4
+++ b/lib/autoconf/programs.m4
@@ -211,9 +211,7 @@ AU_DEFUN([AC_CHECK_TOOL_PREFIX])
 AC_DEFUN([_AC_TOOL_WARN],
 [case $cross_compiling:$ac_tool_warned in
 yes:)
-AC_MSG_WARN([In the future, Autoconf will not detect cross-tools
-whose name does not start with the host triplet.  If you think this
-configuration is useful to you, please write to address@hidden)
+AC_MSG_WARN([using cross tools not prefixed with host triplet])
 ac_tool_warned=yes ;;
 esac])
 
-- 
1.6.0