How do you use a canonical system type? Usually, you use it in one or
more case statements in `configure.in' to select
system-specific C files. Then link those files, which have names based
on the system name, to generic names, such as `host.h' or
`target.c'. The case statement patterns can use shell
wildcards to group several cases together, like in this fragment:
case "$target" in i386-*-mach* | i386-*-gnu*) obj_format=aout emulation=mach bfd_gas=yes ;; i960-*-bout) obj_format=bout ;; esac
AC_OUTPUT link each of the existing files source to
the corresponding link name dest. Makes a symbolic link if
possible, otherwise a hard link. The dest and source names
should be relative to the top level source or build directory.
This macro may be called multiple times.
For example, this call:
AC_LINK_FILES(config/${machine}.h config/${obj_format}.h, host.h object.h)
creates in the current directory `host.h', which is a link to `srcdir/config/${machine}.h', and `object.h', which is a link to `srcdir/config/${obj_format}.h'.
You can also use the host system type to find cross-compilation tools.
See section Generic Program and File Checks, for information about the AC_CHECK_TOOL
macro which does that.
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