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11.3 Using the System Type

How do you use a canonical system type? Usually, you use it in one or more case statements in `configure.ac' to select system-specific C files. Then, using AC_CONFIG_LINKS, link those files which have names based on the system name, to generic names, such as `host.h' or `target.c' (see section 4.9 Creating Configuration Links). The case statement patterns can use shell wild cards 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

and in `configure.ac', use:

 
AC_CONFIG_LINKS(host.h:config/$machine.h
                object.h:config/$obj_format.h)

You can also use the host system type to find cross-compilation tools. See section 5.2.2 Generic Program and File Checks, for information about the AC_CHECK_TOOL macro which does that.



 

  

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