* HACKING (Porting the Guix distro on a new platform): Remove.
* doc/guix.texi (Porting): New node.  Describe cross-compilation as the
  only approach.

* doc/guix.texi (Package Modules): New node, with material formerly
  under "GNU Distribution".
  (Bootstrapping): New node.
* Makefile.am (EXTRA_DIST): Add doc/images/bootstrap-graph.dot and
  doc/images/bootstrap-graph.eps.
  (infoimagedir, dist_infoimage_DATA, DOT_OPTIONS): New variable.
  (.dot.png, .dot.eps, doc/guix.pdf, doc/guix.info, doc/guix.ps): New
  targets.
* doc/images/bootstrap-graph.dot: New file.

* gnu/packages/gcc.scm (gcc-4.7): Add `native-inputs' field.
  (gcc-4.8): Remove outdated comment.
* gnu/packages/base.scm (gcc-boot0): Add `native-inputs' field.

* gnu/packages/make-bootstrap.scm (%guile-static-stripped): Add
  `outputs' field.

* guix/build-system/gnu.scm (gnu-build, gnu-cross-build): Delete "debug"
  from OUTPUTS when STRIP-BINARIES? is false.
* gnu/packages/cross-base.scm (cross-libc): Leave `outputs' unchanged.
  This reverts commit a4627d49.

* gnu/packages/cross-base.scm (cross-libc): Remove "debug" from the
  `outputs' field.

* gnu/packages/base.scm (coreutils, gnu-make, glibc): Add a "debug" output.
* gnu/packages/bdw-gc.scm (libgc): Likewise.
* gnu/packages/guile.scm (guile-2.0): Likewise.
* gnu/packages/libffi.scm (libffi): Likewise.
* gnu/packages/multiprecision.scm (gmp, mpfr, mpc): Likewise.

* guix/build/gnu-build-system.scm (strip): Add `objcopy-command' keyword
  parameter.
  [debug-output, debug-file-extension]: New variables.
  [debug-file, make-debug-file, add-debug-link]: New procedures.
  [strip-dir]: Use them.

* guix/build/utils.scm: Re-export `alist-cons' and `alist-delete'.

* gnu/packages/cross-base.scm (gcc-configure-flags-for-triplet): Move to...
* gnu/packages/gcc.scm (gcc-configure-flags-for-triplet): ... here.  New
  procedure.
  (gcc-4.7): Use it when (%current-target-system) is true.

* build-aux/hydra/gnu-system.scm (%packages-to-cross-build): Add
  %bootstrap-tarballs.
  (%cross-targets): Add "mips64el-linux-gnuabi64".

* gnu/packages/cross-base.scm (gcc-configure-flags-for-triplet): New
  procedure.
  (cross-gcc): Use it.
  (xgcc-mips64el): Use *-gnuabi64 instead of the N32 ABI.

* gnu/packages/make-bootstrap.scm (%binutils-static): Inherit configure
  flags from BINUTILS.

* gnu/packages/make-bootstrap.scm (%gcc-static): Pass `-static' through
  `LDFLAGS' when cross-compiling.

* gnu/packages/gcc.scm (gcc-4.7): Define `CC_FOR_TARGET',
  `AR_FOR_TARGET', etc. when cross-compiling.

* gnu/packages/bootstrap.scm (glibc-dynamic-linker): Determine SYSTEM
  based on (%current-target-system) when it's true.
* gnu/packages/cross-base.scm (cross-gcc): Directly call
  (package-arguments gcc-4.7) from the body of `arguments'.

* gnu/packages/cross-base.scm (cross-binutils): Use `--with-sysroot=/'.

* build-aux/hydra/gnu-system.scm (%packages-to-cross-build): Uncomment
  the bootstrap tarball packages.

* gnu/packages/make-bootstrap.scm (package-with-relocatable-glibc): Turn
  `inputs' into a thunk.  Add `native-inputs', and pass it to
  `package-with-explicit-inputs'.
  (%static-inputs): Add %BASH-STATIC as an input to gawk when cross
  building.
  (%glibc-stripped): When cross compiling,
  use (glibc-for-bootstrap (cross-libc)) as the basis.
  (%gcc-static): Base on GCC-4.7, not GCC-FINAL.
  (tarball-package): TAR and XZ are native inputs.  Choose the tarball
  file name based on (%current-target-system) too.

* guix/build-system/gnu.scm (package-with-explicit-inputs)[rewritten-input]:
  Leave P unchanged if its build system is not GNU-BUILD-SYSTEM.

* gnu/packages/cross-base.scm (cross-gcc): Change `inputs' to
  `native-inputs', and set `inputs' to the empty list.
  (cross-libc): Likewise.

* guix/build-system/gnu.scm (package-with-explicit-inputs): Add
  `native-inputs' keyword parameter.  Allow INPUTS and NATIVE-INPUTS to
  be thunks.

* guix/build-system/trivial.scm (trivial-cross-build): Don't bind
  `%target' here since this causes problem when BUILDER
  contains (use-modules ...) clauses, and can be achieved differently
  anyway.

* gnu/packages/gawk.scm (gawk)[arguments]: Annihilate the
  `check-for-shared-lib-support' target when cross-compiling.

* guix/build-system/gnu.scm (gnu-cross-build): Change #:tests? to
  default to #f.

* gnu/packages/libffi.scm (libffi): Upgrade to 3.0.13.

* guix/build/utils.scm (set-path-environment-variable): When VALUE is
  the empty string, call `unsetenv' instead of `setenv'.
* gnu/packages/guile.scm (guile-2.0)[arguments]: Remove `unsetenv'
  trick.

* gnu/packages/acl.scm (acl): Make `gettext' a native input, always.
* gnu/packages/attr.scm (attr): Likewise.

* gnu/packages/multiprecision.scm (gmp): Update to 5.1.2.

* gnu/packages/gawk.scm (gawk): Update to 4.1.0.  Remove wrong-headed
  comments.

* gnu/packages/compression.scm (gzip): Upgrade.

* guix/build/gnu-build-system.scm (check): Add `target' formal
  parameter.  Change `tests?' to default to (not target).

* guix/build/gnu-build-system.scm (set-paths): Move `system' call to...
  (gnu-build): ... here.

* guix/build/gnu-build-system.scm (set-paths): Add `native-inputs' and
  `native-search-paths' keyword parameters.  Honor them.
  (configure): Add `target' and `native-inputs' keyword parameters.
  Look for Bash in NATIVE-INPUTS or INPUTS.  Pass `--host' when TARGET
  is true.
  (strip): Add `strip-command' keyword parameter.  Use it.
* guix/build/gnu-cross-build.scm: Remove.
* Makefile.am (MODULES): Adjust accordingly.
* gnu/packages/acl.scm, gnu/packages/attr.scm, gnu/packages/base.scm,
  gnu/packages/bash.scm, gnu/packages/gawk.scm,
  gnu/packages/gettext.scm, gnu/packages/guile.scm,
  gnu/packages/libffi.scm, gnu/packages/libsigsegv.scm,
  gnu/packages/linux.scm, gnu/packages/ncurses.scm,
  gnu/packages/readline.scm, guix/build-system/gnu.scm: Replace
  `%standard-cross-phases' by `%standard-phases'.  Remove references
  to (guix build gnu-cross-build).

Conflicts:
	gnu/packages/make-bootstrap.scm

* gnu/packages/bdw-gc.scm (libgc): Add `arguments' field.
* gnu/packages/make-bootstrap.scm (%guile-static): Remove local `libgc'.

* gnu/packages/bdw-gc.scm (libgc): Upgrade to 7.2d.
  (libgc-7.2): Remove.

* hydra.scm: Rename to...
* build-aux/hydra/gnu-system.scm: ... this.
* Makefile.am (EXTRA_DIST): Adjust accordingly.

* guix/scripts/package.scm (guix-package)[process-actions]: Use `N_' for
  i18n of the number of packages message.

* guix/scripts/substitute-binary.scm (decompressed-port): Improve docstring.
  (progress-report-port): New procedure.
  (guix-substitute-binary)["--substitute"]: Use it to report progress.
* guix/build/download.scm: Export `progress-proc' and `uri-abbreviation'.