Re: detecting OS

[Alexandre Duret-Lutz]

>>> "Ralf" == Ralf Corsepius <address@hidden> writes:

 Ralf> Am Sam, 2001-11-17 um 04.29 schrieb Harlan Stenn:
 >> AC_CANONICAL_TARGET and then
 >> 
 >> case "$target" in
 >> *-*-linux*)
 >> ...
 >> ;;
 >> *-*-freebsd*)
 >> ...
 >> ;;
 >> ...
 >> esac
 >> 
 >> ("$target" doesn't need the quotes, but I do them anyway.)
 Ralf> Sorry, $target is meant to be used for cross-tools, $host is what you
 Ralf> normally want to use instead.

Index: ChangeLog
from  Alexandre Duret-Lutz  <address@hidden>

        * doc/autoconf.texi (Using System Type): Add an example of `case
        $host' usage so people quit using `case $target' everywhere.

Index: doc/autoconf.texi
===================================================================
RCS file: /cvs/autoconf/doc/autoconf.texi,v
retrieving revision 1.563
diff -u -r1.563 autoconf.texi
--- doc/autoconf.texi   2001/11/16 20:10:52     1.563
+++ doc/autoconf.texi   2001/11/22 09:11:09
@@ -9498,11 +9498,34 @@
 @end example
 
 @noindent
-and in @file{configure.ac}, use:
+and later in @file{configure.ac}, use:
 
 @example
 AC_CONFIG_LINKS(host.h:config/$machine.h
                 object.h:config/$obj_format.h)
address@hidden example
+
+Note that the above example uses @code{$target} because it's taken from
+a tool which can be built on some architecture (@code{$build}), run on
+another (@code{$host}), but yet handle data for a third architecture
+(@code{$target}).  Such tools are usually part of a compiler suite, they
+generate code for a specific @code{$target}.
+
+However @code{$target} should be meaningless for most packages.  If you
+want to base a decision on the system where your program will be run,
+make sure you use the @code{$host} variable, as in the following
+excerpt:
+
address@hidden
+case "$host" in
+  *-*-msdos* | *-*-go32* | *-*-mingw32* | *-*-cygwin* | *-*-windows*)
+    MUMBLE_INIT="mumble.ini"
+    ;;
+  *)
+    MUMBLE_INIT=".mumbleinit"
+    ;;
+esac
+AC_SUBST([MUMBLE_INIT])
 @end example
 
 You can also use the host system type to find cross-compilation tools.

-- 
Alexandre Duret-Lutz