175 lines
6.8 KiB
Scheme
175 lines
6.8 KiB
Scheme
#!@BASH@
|
|
# -*- mode: scheme; coding: utf-8; -*-
|
|
|
|
# XXX: We have to go through Bash because there's no command-line switch to
|
|
# augment %load-compiled-path, and because of the silly 127-byte limit for
|
|
# the shebang line in Linux.
|
|
# Use `load-compiled' because `load' (and `-l') doesn't otherwise load our
|
|
# .go file (see <http://bugs.gnu.org/12519>).
|
|
|
|
main="(@ (gnu build-support ld-wrapper) ld-wrapper)"
|
|
exec @GUILE@ -c "(load-compiled \"@SELF@.go\") (apply $main (cdr (command-line)))" "$@"
|
|
!#
|
|
;;; GNU Guix --- Functional package management for GNU
|
|
;;; Copyright © 2012, 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org>
|
|
;;;
|
|
;;; This file is part of GNU Guix.
|
|
;;;
|
|
;;; GNU Guix is free software; you can redistribute it and/or modify it
|
|
;;; under the terms of the GNU General Public License as published by
|
|
;;; the Free Software Foundation; either version 3 of the License, or (at
|
|
;;; your option) any later version.
|
|
;;;
|
|
;;; GNU Guix is distributed in the hope that it will be useful, but
|
|
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
;;; GNU General Public License for more details.
|
|
;;;
|
|
;;; You should have received a copy of the GNU General Public License
|
|
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
(define-module (gnu build-support ld-wrapper)
|
|
#:use-module (srfi srfi-1)
|
|
#:use-module (ice-9 match)
|
|
#:export (ld-wrapper))
|
|
|
|
;;; Commentary:
|
|
;;;
|
|
;;; This is a wrapper for the linker. Its purpose is to inspect the -L and
|
|
;;; -l switches passed to the linker, add corresponding -rpath arguments, and
|
|
;;; invoke the actual linker with this new set of arguments.
|
|
;;;
|
|
;;; The alternatives to this hack would be:
|
|
;;;
|
|
;;; 1. Using $LD_RUN_PATH. However, that would tend to include more than
|
|
;;; needed in the RPATH; for instance, given a package with `libfoo' as
|
|
;;; an input, all its binaries would have libfoo in their RPATH,
|
|
;;; regardless of whether they actually NEED it.
|
|
;;;
|
|
;;; 2. Use a GCC "lib" spec string such as `%{L*:-rpath %*}', which adds a
|
|
;;; `-rpath LIBDIR' argument for each occurrence of `-L LIBDIR'.
|
|
;;; However, this doesn't work when $LIBRARY_PATH is used, because the
|
|
;;; additional `-L' switches are not matched by the above rule, because
|
|
;;; the rule only matches explicit user-provided switches. See
|
|
;;; <http://gcc.gnu.org/ml/gcc-help/2012-09/msg00110.html> for details.
|
|
;;;
|
|
;;; As a bonus, this wrapper checks for "impurities"--i.e., references to
|
|
;;; libraries outside the store.
|
|
;;;
|
|
;;; Code:
|
|
|
|
(define %real-ld
|
|
;; Name of the linker that we wrap.
|
|
"@LD@")
|
|
|
|
(define %store-directory
|
|
;; File name of the store.
|
|
(or (getenv "NIX_STORE") "/gnu/store"))
|
|
|
|
(define %temporary-directory
|
|
;; Temporary directory.
|
|
(or (getenv "TMPDIR") "/tmp"))
|
|
|
|
(define %build-directory
|
|
;; Top build directory when run from a builder.
|
|
(getenv "NIX_BUILD_TOP"))
|
|
|
|
(define %allow-impurities?
|
|
;; Whether to allow references to libraries outside the store.
|
|
(getenv "GUIX_LD_WRAPPER_ALLOW_IMPURITIES"))
|
|
|
|
(define %debug?
|
|
;; Whether to emit debugging output.
|
|
(getenv "GUIX_LD_WRAPPER_DEBUG"))
|
|
|
|
(define (pure-file-name? file)
|
|
;; Return #t when FILE is the name of a file either within the store
|
|
;; (possibly via a symlink) or within the build directory.
|
|
(define %max-symlink-depth 50)
|
|
|
|
(let loop ((file file)
|
|
(depth 0))
|
|
(or (not (string-prefix? "/" file))
|
|
(string-prefix? %store-directory file)
|
|
(string-prefix? %temporary-directory file)
|
|
(if %build-directory
|
|
(string-prefix? %build-directory file)
|
|
|
|
;; When used from a user environment, FILE may refer to
|
|
;; ~/.guix-profile/lib/libfoo.so, which is itself a symlink to the
|
|
;; store. Check whether this is the case.
|
|
(let ((s (false-if-exception (lstat file))))
|
|
(and s
|
|
(eq? 'symlink (stat:type s))
|
|
(< depth %max-symlink-depth)
|
|
(loop (readlink file) (+ 1 depth))))))))
|
|
|
|
(define (shared-library? file)
|
|
;; Return #t when FILE denotes a shared library.
|
|
(or (string-suffix? ".so" file)
|
|
(let ((index (string-contains file ".so.")))
|
|
;; Since we cannot use regexps during bootstrap, roll our own.
|
|
(and index
|
|
(string-every (char-set-union (char-set #\.) char-set:digit)
|
|
(string-drop file (+ index 3)))))))
|
|
|
|
(define (library-files-linked args)
|
|
;; Return the file names of shared libraries explicitly linked against via
|
|
;; `-l' or with an absolute file name in ARGS.
|
|
(define path+files
|
|
(fold (lambda (argument result)
|
|
(match result
|
|
((library-path . library-files)
|
|
(cond ((string-prefix? "-L" argument) ;augment the search path
|
|
(cons (append library-path
|
|
(list (string-drop argument 2)))
|
|
library-files))
|
|
((string-prefix? "-l" argument) ;add library
|
|
(let* ((lib (string-append "lib"
|
|
(string-drop argument 2)
|
|
".so"))
|
|
(full (search-path library-path lib)))
|
|
(if full
|
|
(cons library-path
|
|
(cons full library-files))
|
|
result)))
|
|
((and (string-prefix? %store-directory argument)
|
|
(shared-library? argument)) ;add library
|
|
(cons library-path
|
|
(cons argument library-files)))
|
|
(else
|
|
result)))))
|
|
(cons '() '())
|
|
args))
|
|
|
|
(match path+files
|
|
((path . files)
|
|
(reverse files))))
|
|
|
|
(define (rpath-arguments library-files)
|
|
;; Return the `-rpath' argument list for each of LIBRARY-FILES, a list of
|
|
;; absolute file names.
|
|
(fold-right (lambda (file args)
|
|
(if (or %allow-impurities?
|
|
(pure-file-name? file))
|
|
(cons* "-rpath" (dirname file) args)
|
|
(begin
|
|
(format (current-error-port)
|
|
"ld-wrapper: error: attempt to use impure library ~s~%"
|
|
file)
|
|
(exit 1))))
|
|
'()
|
|
library-files))
|
|
|
|
(define (ld-wrapper . args)
|
|
;; Invoke the real `ld' with ARGS, augmented with `-rpath' switches.
|
|
(let* ((libs (library-files-linked args))
|
|
(args (append args (rpath-arguments libs))))
|
|
(when %debug?
|
|
(format (current-error-port)
|
|
"ld-wrapper: invoking `~a' with ~s~%"
|
|
%real-ld args))
|
|
(apply execl %real-ld (basename %real-ld) args)))
|
|
|
|
;;; ld-wrapper.scm ends here
|