distro: gcc: Pass #:strip-binaries?.

* distro/base.scm (gcc-4.7): Pass #:strip-binaries?.

build-system/gnu: Honor the `patch-shebangs?' and `strip-binaries?' parameters.

* guix/build/gnu-build-system.scm (patch-shebangs): Honor
  PATCH-SHEBANGS?.
  (strip): Honor STRIP-BINARIES?.  Display a message from `strip-dir'.

guix-build: Fix the "unrecognized option" error message.

* guix-build.in (guix-build): Show the option name when an unrecognized
  option is passed.

build-system/gnu: Add a `strip' phase.

* guix/build/gnu-build-system.scm (strip): New procedure.
  (%standard-phases): Add it.

* guix/build-system/gnu.scm (gnu-build): New `strip-binaries?',
  `strip-flags', and `strip-directories' keyword parameters.  Pass them
  to BUILDER.

build-system/gnu: Always invoke `configure' with a relative path.

* guix/build/gnu-build-system.scm (configure): Change SRCDIR to always
  be a relative path.

distro: gcc: Do not store configure flags in the resulting binaries.

* distro/base.scm (gcc-4.7): Add a `post-configure' phase to clear
  `TOPLEVEL_CONFIGURE_ARGUMENTS' in the top-level `Makefile'.

define-record-type*: Add the `inherit' syntactic constructor keyword.

* guix/utils.scm (define-record-type*)[make-syntactic-constructor]: New
  `type' parameter.  Add the `inherit' keyword and corresponding support
  code.

* tests/utils.scm ("define-record-type* & inherit", "define-record-type*
  & inherit & letrec* behavior"): New tests.

distro: Add missing Binutils patch.

* distro/patches/binutils-ld-new-dtags.patch: New file.
* Makefile.am (dist_patch_DATA): Add it.

distro: Add the GNU C Library.

* distro/base.scm (glibc): New variable.

distro: Add Linux headers.

* distro/base.scm (linux-headers): New variable.

configure.ac: Make 'guild' configure check fatal, otherwise one gets 'compile: command not found' during make

distro: Add GNU Binutils.

* distro/base.scm (binutils): New variable.

distro: Add GCC.

* distro/base.scm (gcc-4.7): New variable.

utils: Change `substitute*' to accept a list of files to patch.

* guix/build/utils.scm (substitute*): Support a list of files as the
  first argument.

build-system/gnu: Add `out-of-source?' keyword parameter.

* guix/build/gnu-build-system.scm (configure): Add an `out-of-source?'
  keyword parameter; build out-of-source-tree when #t.
* guix/build-system/gnu.scm (gnu-build): Add `out-of-source?' keyword
  parameter.  Pass it in BUILDER.

packages: Raise an error condition upon invalid input.

* guix/packages.scm (&package-error, &package-input-error): New
  condition types.
  (package-derivation): Raise a `&package-input-error' when no match is
  made.

distro: coreutils: Remove erroneous hack.

* distro/base.scm (coreutils)[arguments]: Remove
  "FORCE_UNSAFE_CONFIGURE" setting, since in fact, this is no problem
  when using Nix with separate build users.

distro: Add GNU Coreutils.

* distro/base.scm (coreutils): New variable.

distro: Add XZ.

* distro/base.scm (xz): New variable.

distro: Add GNU gzip.

* distro/base.scm (gzip): New variable.