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When you configure GCC using theconfigure script, it willconstruct the fileMakefile from the template fileMakefile.in. When it does this, it can incorporate makefilefragments from theconfig directory. These are used to setMakefile parameters that are not amenable to being calculated byautoconf. The list of fragments to incorporate is set byconfig.gcc (and occasionallyconfig.buildandconfig.host); SeeTheconfig.build;config.host; andconfig.gcc Files.
Fragments are named eithert-target orx-host,depending on whether they are relevant to configuring GCC to producecode for a particular target, or to configuring GCC to run on aparticular host. Heretarget andhost are mnemonicswhich usually have some relationship to the canonical system name, butno formal connection.
If these files do not exist, it means nothing needs to be added for agiven target or host. Most targets need a fewt-targetfragments, but needingx-host fragments is rare.