Home | History | Annotate | Line # | Download | only in doc 
      1 @c Copyright (C) 1988-2022 Free Software Foundation, Inc.
      2 @c This is part of the GCC manual.
      3 @c For copying conditions, see the file gcc.texi.
      4 
      5 @node Configuration Files
      6 @subsubsection Files Created by @code{configure}
      7 
      8 Here we spell out what files will be set up by @file{configure} in the
      9 @file{gcc} directory.  Some other files are created as temporary files
     10 in the configuration process, and are not used in the subsequent
     11 build; these are not documented.
     12 
     13 @itemize @bullet
     14 @item
     15 @file{Makefile} is constructed from @file{Makefile.in}, together with
     16 the host and target fragments (@pxref{Fragments, , Makefile
     17 Fragments}) @file{t-@var{target}} and @file{x-@var{host}} from
     18 @file{config}, if any, and language Makefile fragments
     19 @file{@var{language}/Make-lang.in}.
     20 @item
     21 @file{auto-host.h} contains information about the host machine
     22 determined by @file{configure}.  If the host machine is different from
     23 the build machine, then @file{auto-build.h} is also created,
     24 containing such information about the build machine.
     25 @item
     26 @file{config.status} is a script that may be run to recreate the
     27 current configuration.
     28 @item
     29 @file{configargs.h} is a header containing details of the arguments
     30 passed to @file{configure} to configure GCC, and of the thread model
     31 used.
     32 @item
     33 @file{cstamp-h} is used as a timestamp.
     34 @item
     35 If a language @file{config-lang.in} file (@pxref{Front End Config, ,
     36 The Front End @file{config-lang.in} File}) sets @code{outputs}, then
     37 the files listed in @code{outputs} there are also generated.
     38 @end itemize
     39 
     40 The following configuration headers are created from the Makefile,
     41 using @file{mkconfig.sh}, rather than directly by @file{configure}.
     42 @file{config.h}, @file{bconfig.h} and @file{tconfig.h} all contain the
     43 @file{xm-@var{machine}.h} header, if any, appropriate to the host,
     44 build and target machines respectively, the configuration headers for
     45 the target, and some definitions; for the host and build machines,
     46 these include the autoconfigured headers generated by
     47 @file{configure}.  The other configuration headers are determined by
     48 @file{config.gcc}.  They also contain the typedefs for @code{rtx},
     49 @code{rtvec} and @code{tree}.
     50 
     51 @itemize @bullet
     52 @item
     53 @file{config.h}, for use in programs that run on the host machine.
     54 @item
     55 @file{bconfig.h}, for use in programs that run on the build machine.
     56 @item
     57 @file{tconfig.h}, for use in programs and libraries for the target
     58 machine.
     59 @item
     60 @file{tm_p.h}, which includes the header @file{@var{machine}-protos.h}
     61 that contains prototypes for functions in the target
     62 @file{@var{machine}.c} file.  The
     63 @file{@var{machine}-protos.h} header is included after the @file{rtl.h}
     64 and/or @file{tree.h} would have been included.
     65 The @file{tm_p.h} also
     66 includes the header @file{tm-preds.h} which is generated by
     67 @file{genpreds} program during the build to define the declarations
     68 and inline functions for the predicate functions.
     69 @end itemize
     70