* guix/build/utils.scm (substitute): Do not pass the OUT to PROC; use
`list-matches' instead of `regexp-exec' and pass a list of matches to
PROC. Expect PROC to return a string, and output that. Fold over
RX+PROC in order. Use `(read-line p 'concat)' to include the trailing
delimiter in LINE.
(substitute*): Produce code to iterate over the matches, and return a
string, which includes anything from the original line that's in
between matches.
* distro/base.scm (gcc-4.7, glibc): Adjust accordingly: remove use
of (ice-9 regex) and `regexp-substitute/global'; return a string.
* guix/build/utils.scm (patch-shebang): Add an optional `path'
parameter. Change SHEBANG-RX to match the whole interpreter file
name. Don't patch when BIN and CMD are the same. Add docstring.
* guix/build/utils.scm (substitute): Change to accept a `pattern+procs'
parameter. Iterate over it.
(substitute*): Adjust accordingly.
* distro/base.scm (guile-1.8): Adjust accordingly.
* guix/build/utils.scm (let-matches, substitute*): New macros.
* distro/base.scm (guile-1.8): Use `substitute*' instead of
`substitute'. Remove the #:modules argument.
* guix/derivations.scm (build-expression->derivation): Add all of INPUTS
as inputs to the final derivation.
* guix/build/gnu-build-system.scm, guix/build/utils.scm,
guix/gnu-build-system.scm: New files.
* tests/builders.scm ("gnu-build"): New test.
Ludovic Courtès