gnu: grep: Skip timing-sensitive test.

This avoids failures on loaded machines as seen
at <http://hydra.gnu.org/build/906900/log/raw>.

* gnu/packages/patches/grep-timing-sensitive-test.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.
* gnu/packages/base.scm (grep): Use it.

gnu: pkg-config: Update to 0.29.

* gnu/packages/pkg-config.scm (%pkg-config): Update to 0.29.

gnu: libgc: Enable C++ support.

* gnu/packages/bdw-gc.scm (libgc-7.2, libgc)[arguments]: Add
  --enable-cplusplus to #:configure-flags.

gnu: findutils: Update to 4.6.0.

* gnu/packages/patches/findutils-absolute-paths.patch: Remove.
* gnu/packages/patches/findutils-test-xargs.patch: New file.
* gnu-system.am (dist_patch_DATA): Adjust accordingly.
* gnu/packages/base.scm (findutils): Update to 4.6.0.  Remove
'findutils-absolute-paths.patch' and add 'findutils-test-xargs.patch'.

build-system/gnu: Use the long option name for deterministic archives.

This is a followup to 3eb34c6.

* guix/build-system/gnu.scm (gnu-build, gnu-cross-build): Use
"--enable-deterministic-archives" instead of "-D" to work around
Binutils bug <https://sourceware.org/bugzilla/show_bug.cgi?id=17671>.
* guix/build/gnu-build-system.scm (strip): Likewise.

gnu: guile-2.0: Add "lib/guile/2.0/ccache" to the search path.

* gnu/packages/guile.scm (guile-2.0)[native-search-paths]: Add
"lib/guile/2.0/ccache" to GUILE_LOAD_COMPILED_PATH.

gnu: python-wrapper: Append "-wrapper" to the underlying package name.

Reported by Federico Beffa <beffa@ieee.org>.

* gnu/packages/python.scm (wrap-python3): Change the default value of
'name' to include the name of PYTHON.  This disambiguates between
'python-minimal-wrapper' and 'python-wrapper'.

gnu: commencement: Build Bison deterministically.

Before that entries in liby.a would contain the build time.

* gnu/packages/commencement.scm (bison-boot1): Add #:make-flags.

build-system/gnu: Always pass "-D" to strip/objcopy.

* guix/build-system/gnu.scm (gnu-build, gnu-cross-build): Add "-D" to
  #:strip-flags.
* guix/build/gnu-build-system.scm (strip): Likewise.  Also pass "-D" to
  OBJCOPY-COMMAND.

gnu: commencement: Build the final Bash with "bison-boot1".

This removes a round of Bison + Flex + M4 + Perl rebuild.

* gnu/packages/commencement.scm (bash-final): Add 'native-inputs'
field pointing to BISON-BOOT1.

gnu: commencement: Avoid redundant Perl rebuild.

This removes a redundant (yet different) "perl-boot0" node from the
early derivation graph.

* gnu/packages/commencement.scm (bison-boot1): Move 'native-inputs'
field to the final package.  Previously PERL-BOOT0 got rebuilt with
%BOOT0-INPUTS, leading to a different derivation.
(static-bash-for-glibc): Likewise.

gnu: commencement: Add "-boot0" to early packages.

* gnu/packages/commencement.scm (diffutils-boot0)[name]: New field.
* gnu/packages/commencement.scm (findutils-boot0, file-boot0,
perl-boot0): Change 'name' field to include "-boot0".

gnu: gcc: Prefer language-specific variables over 'CPATH'.

Suggested by Andy Wingo <wingo@igalia.com>.
Fixes <http://bugs.gnu.org/22186>.

* gnu/packages/gcc.scm (gcc-4.7)[native-search-paths]: Remove 'CPATH';
add 'C_INCLUDE_PATH' and 'CPLUS_INCLUDE_PATH' instead.
* gnu/packages/gcc.scm (custom-gcc): Add 'search-paths' parameter and
honor it.
(%generic-search-paths): New variable.
(gfortran-4.8, gfortran-4.9, gfortran, gfortran-5, gccgo-4.8): Pass
%GENERIC-SEARCH-PATHS to 'custom-gcc'.
(gcj)[native-search-paths]: New field.
(gcc-objc-4.8, gcc-objc++-4.8): Use 'OBJC_INCLUDE_PATH' and
'OBJCPLUS_INCLUDE_PATH', respectively.

gnu: commencement: Use GMP 6.0.0a for bootstrapping.

* gnu/packages/multiprecision.scm (gmp-6.0): New variable.
* gnu/packages/commencement.scm (gcc-boot0, gcc-final): Use it.
* gnu/packages/patches/gmp-arm-asm-nothumb.patch: New file, reinstated
from before e414a7d.
* gnu-system.am (dist_patch_DATA): Add it.

gnu: glibc: Remove timestamp from 'nscd' binary.

This makes libc bit-for-bit reproducible per '--rounds=2'.

* gnu/packages/base.scm (glibc)[arguments] <pre-configure>: Remove
__DATE__ and __TIME__ from nscd_stat.c.

gnu: pcre: Add "doc" output.

* gnu/packages/pcre.scm (pcre)[outputs]: New field.

gnu: util-linux: Do not build static libraries.

* gnu/packages/linux.scm (util-linux)[arguments]: Pass --disable-static.

gnu: gettext: Add "doc" output.

* gnu/packages/gettext.scm (gnu-gettext)[outputs]: New field.

gnu: ncurses: Add "doc" output.

* gnu/packages/ncurses.scm (ncurses)[outputs]: New field.
[arguments] <configure>: Replace standard 'configure' phase.
<remove-shebang-phase>: Remove "mandir=" line from 'ncursesw6-config'.

gnu: ncurses: Add 'TERMINFO_DIRS' search path variable.

* gnu/packages/ncurses.scm (ncurses)[native-search-paths]: New field.