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1;;; GNU Guix --- Functional package management for GNU
2;;; Copyright © 2014, 2015, 2016, 2017, 2019 Eric Bavier <[email protected]>
3;;; Copyright © 2016, 2017, 2018, 2020 Efraim Flashner <[email protected]>
4;;; Copyright © 2018 Tobias Geerinckx-Rice <[email protected]>
5;;; Copyright © 2018, 2019 Rutger Helling <[email protected]>
6;;; Copyright © 2019 Pkill -9 <[email protected]>
7;;; Copyright © 2020 Vincent Legoll <[email protected]>
8;;;
9;;; This file is part of GNU Guix.
10;;;
11;;; GNU Guix is free software; you can redistribute it and/or modify it
12;;; under the terms of the GNU General Public License as published by
13;;; the Free Software Foundation; either version 3 of the License, or (at
14;;; your option) any later version.
15;;;
16;;; GNU Guix is distributed in the hope that it will be useful, but
17;;; WITHOUT ANY WARRANTY; without even the implied warranty of
18;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19;;; GNU General Public License for more details.
20;;;
21;;; You should have received a copy of the GNU General Public License
22;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
23
24(define-module (gnu packages debug)
25 #:use-module (guix packages)
26 #:use-module ((guix licenses) #:prefix license:)
27 #:use-module (guix download)
28 #:use-module (guix git-download)
29 #:use-module (guix utils)
30 #:use-module (guix build-system gnu)
31 #:use-module (guix build-system cmake)
32 #:use-module (gnu packages)
33 #:use-module (gnu packages attr)
34 #:use-module (gnu packages autotools)
35 #:use-module (gnu packages base)
36 #:use-module (gnu packages bash)
37 #:use-module (gnu packages bison)
38 #:use-module (gnu packages code)
39 #:use-module (gnu packages compression)
40 #:use-module (gnu packages flex)
41 #:use-module (gnu packages gdb)
42 #:use-module (gnu packages glib)
43 #:use-module (gnu packages gtk)
44 #:use-module (gnu packages golang)
45 #:use-module (gnu packages image)
46 #:use-module (gnu packages linux)
47 #:use-module (gnu packages llvm)
48 #:use-module (gnu packages ncurses)
49 #:use-module (gnu packages ninja)
50 #:use-module (gnu packages perl)
51 #:use-module (gnu packages pkg-config)
52 #:use-module (gnu packages pretty-print)
53 #:use-module (gnu packages python)
54 #:use-module (gnu packages python-xyz)
55 #:use-module (gnu packages readline)
56 #:use-module (gnu packages serialization)
57 #:use-module (gnu packages virtualization)
58 #:use-module (gnu packages xdisorg)
59 #:use-module (ice-9 match)
60 #:use-module (srfi srfi-1))
61
62(define-public delta
63 (package
64 (name "delta")
65 (version "2006.08.03")
66 (source
67 (origin
68 (method url-fetch)
69 (uri (list
70 (string-append "mirror://debian/pool/main/d/delta/"
71 "delta_" version ".orig.tar.gz")
72 ;; This uri seems to send guix download into an infinite loop
73 (string-append "http://delta.tigris.org/files/documents/3103/"
74 "33566/delta-" version ".tar.gz")))
75 (sha256
76 (base32
77 "184wh35pf2ddx97319s6sgkzpz48xxkbwzcjpycv009bm53lh61q"))))
78 (build-system gnu-build-system)
79 (inputs ;Installed programs are perl scripts
80 `(("perl" ,perl)))
81 (arguments
82 `(#:phases
83 (modify-phases %standard-phases
84 (replace 'install
85 (lambda* (#:key outputs #:allow-other-keys)
86 ;; Makefile contains no install target
87 (let* ((out (assoc-ref outputs "out"))
88 (bin (string-append out "/bin"))
89 (doc (string-append out "/share/doc/delta-" ,version)))
90 (begin
91 (for-each (lambda (h)
92 (install-file h doc))
93 `("License.txt" ,@(find-files "www" ".*\\.html")))
94 (for-each (lambda (b)
95 (install-file b bin))
96 `("delta" "multidelta" "topformflat"))))
97 #t))
98 (delete 'configure)))) ; no configure script
99 (home-page "http://delta.tigris.org/")
100 (synopsis "Heuristical file minimizer")
101 (description
102 "Delta assists you in minimizing \"interesting\" files subject to a test
103of their interestingness. A common such situation is when attempting to
104isolate a small failure-inducing substring of a large input that causes your
105program to exhibit a bug.")
106 ;; See License.txt, which is a bsd-3 license, despite the project's
107 ;; home-page pointing to a bsd-2 license.
108 (license license:bsd-3)))
109
110(define-public c-reduce
111 (package
112 (name "c-reduce")
113 (version "2.10.0")
114 (source
115 (origin
116 (method url-fetch)
117 (uri (list
118 (string-append "http://embed.cs.utah.edu/creduce/"
119 "creduce-" version ".tar.gz")))
120 (sha256
121 (base32 "0qx0zq8jxzx2as2zf0740g7kvgq163ayn3041di4vwk77490y76v"))))
122 (build-system gnu-build-system)
123 (native-inputs `(("flex" ,flex)))
124 (inputs
125 `(("astyle" ,astyle)
126 ("llvm" ,llvm)
127 ("clang" ,clang)
128 ("indent" ,indent)
129 ("perl" ,perl)
130 ("exporter-lite" ,perl-exporter-lite)
131 ("file-which" ,perl-file-which)
132 ("getopt-tabular" ,perl-getopt-tabular)
133 ("regex-common" ,perl-regexp-common)
134 ("term-readkey" ,perl-term-readkey)))
135 (arguments
136 `(#:phases
137 (modify-phases %standard-phases
138 (replace 'check
139 (lambda _
140 (with-directory-excursion "tests"
141 ;; Running all tests can take a looong time, and tests 4 and 5
142 ;; require frama-c or kcc. So run just one for sanity.
143 (invoke "./run_tests" "1"))))
144 (add-after 'install 'set-load-paths
145 (lambda* (#:key inputs outputs #:allow-other-keys)
146 ;; Tell creduce where to find the perl modules it needs.
147 (let* ((out (assoc-ref outputs "out"))
148 (prog (string-append out "/bin/creduce")))
149 (wrap-program
150 prog
151 `("PERL5LIB" ":" prefix
152 ,(map (lambda (p)
153 (string-append (assoc-ref inputs p)
154 "/lib/perl5/site_perl/"
155 ,(package-version perl)))
156 '("term-readkey" "exporter-lite"
157 "file-which" "getopt-tabular"
158 "regex-common")))))
159 #t)))))
160 (home-page "https://embed.cs.utah.edu/creduce")
161 (synopsis "Reducer for interesting code")
162 (description
163 "C-Reduce is a tool that takes a large C or C++ program that has a
164property of interest (such as triggering a compiler bug) and automatically
165produces a much smaller C/C++ program that has the same property. It is
166intended for use by people who discover and report bugs in compilers and other
167tools that process C/C++ code.")
168 (license license:ncsa)))
169
170(define-public american-fuzzy-lop
171 (let ((machine (match (or (%current-target-system)
172 (%current-system))
173 ("x86_64-linux" "x86_64")
174 ("i686-linux" "i386")
175 ("aarch64-linux" "aarch64")
176 ("armhf-linux" "arm")
177 ("mips64el-linux" "mips64el")
178 ;; Prevent errors when querying this package on unsupported
179 ;; platforms, e.g. when running "guix package --search="
180 (_ "UNSUPPORTED"))))
181 (package
182 (name "american-fuzzy-lop")
183 (version "2.56b") ;It seems all releases have the 'b' suffix
184 (source
185 (origin
186 (method git-fetch)
187 (uri (git-reference
188 (url "https://github.com/google/AFL")
189 (commit (string-append "v" version))))
190 (sha256
191 (base32 "1q1g59gkm48aa4cg9h70jx4i2gapmypgp5rzs156b2avd95vwkn1"))
192 (file-name (git-file-name name version))))
193 (build-system gnu-build-system)
194 (inputs
195 `(("qemu" ,qemu-for-american-fuzzy-lop)))
196 (arguments
197 `(#:make-flags (list (string-append "PREFIX=" (assoc-ref %outputs "out"))
198 (string-append "DOC_PATH=$(PREFIX)/share/doc/"
199 ,name "-" ,version)
200 "CC=gcc")
201 #:phases (modify-phases %standard-phases
202 (add-after 'unpack 'make-git-checkout-writable
203 (lambda _
204 (for-each make-file-writable (find-files "."))
205 #t))
206 (delete 'configure)
207 ,@(if (string=? (%current-system) (or "x86_64-linux"
208 "i686-linux"))
209 '()
210 '((add-before 'build 'set-afl-flag
211 (lambda _ (setenv "AFL_NO_X86" "1") #t))
212 (add-after 'install 'remove-x86-programs
213 (lambda* (#:key outputs #:allow-other-keys)
214 (let* ((out (assoc-ref outputs "out"))
215 (bin (string-append out "/bin/")))
216 (delete-file (string-append bin "afl-gcc"))
217 (delete-file (string-append bin "afl-g++"))
218 (delete-file (string-append bin "afl-clang"))
219 (delete-file (string-append bin "afl-clang++")))
220 #t))))
221 (add-after
222 ;; TODO: Build and install the afl-llvm tool.
223 'install 'install-qemu
224 (lambda* (#:key inputs outputs #:allow-other-keys)
225 (let ((qemu (assoc-ref inputs "qemu"))
226 (out (assoc-ref outputs "out")))
227 (symlink (string-append qemu "/bin/qemu-" ,machine)
228 (string-append out "/bin/afl-qemu-trace"))
229 #t)))
230 (delete 'check)))) ; tests are run during 'install phase
231 (home-page "https://lcamtuf.coredump.cx/afl/")
232 (synopsis "Security-oriented fuzzer")
233 (description
234 "American fuzzy lop is a security-oriented fuzzer that employs a novel
235type of compile-time instrumentation and genetic algorithms to automatically
236discover clean, interesting test cases that trigger new internal states in the
237targeted binary. This substantially improves the functional coverage for the
238fuzzed code. The compact synthesized corpora produced by the tool are also
239useful for seeding other, more labor- or resource-intensive testing regimes
240down the road.")
241 (license license:asl2.0))))
242
243(define-public qemu-for-american-fuzzy-lop
244 ;; afl only supports using a single afl-qemu-trace executable, so
245 ;; we only build qemu for the native target.
246 (let ((machine (match (or (%current-target-system)
247 (%current-system))
248 ("x86_64-linux" "x86_64")
249 ("i686-linux" "i386")
250 ("aarch64-linux" "aarch64")
251 ("armhf-linux" "arm")
252 ("mips64el-linux" "mips64el")
253 ;; Prevent errors when querying this package on unsupported
254 ;; platforms, e.g. when running "guix package --search="
255 (_ "UNSUPPORTED"))))
256 (hidden-package
257 (package
258 (name "qemu")
259 (version "2.10.2")
260 (source (origin
261 (method url-fetch)
262 (uri (string-append "https://download.qemu.org/qemu-"
263 version ".tar.xz"))
264 (sha256
265 (base32
266 "17w21spvaxaidi2am5lpsln8yjpyp2zi3s3gc6nsxj5arlgamzgw"))
267 (patches
268 (search-patches "qemu-glibc-2.27.patch"))))
269 (build-system gnu-build-system)
270 (arguments
271 `(;; Running tests in parallel can occasionally lead to failures, like:
272 ;; boot_sector_test: assertion failed (signature == SIGNATURE): (0x00000000 == 0x0000dead)
273 #:parallel-tests? #f
274 #:configure-flags
275 (list (string-append "--target-list=" ,machine "-linux-user"))
276 #:make-flags '("V=1")
277 #:phases
278 (modify-phases %standard-phases
279 (replace 'configure
280 (lambda* (#:key inputs outputs (configure-flags '())
281 #:allow-other-keys)
282 ;; The `configure' script doesn't understand some of the
283 ;; GNU options. Thus, add a new phase that's compatible.
284 (let ((out (assoc-ref outputs "out")))
285 (setenv "SHELL" (which "bash"))
286
287 ;; While we're at it, patch for tests.
288 (substitute* "tests/libqtest.c"
289 (("/bin/sh") (which "sh")))
290
291 ;; The binaries need to be linked against -lrt.
292 (setenv "LDFLAGS" "-lrt")
293 (apply invoke
294 `("./configure"
295 ,(string-append "--cc=" (which "gcc"))
296 ;; Some architectures insist on using HOST_CC
297 ,(string-append "--host-cc=" (which "gcc"))
298 "--disable-debug-info" ; save build space
299 "--enable-virtfs" ; just to be sure
300 ,(string-append "--prefix=" out)
301 ,(string-append "--sysconfdir=/etc")
302 ,@configure-flags)))))
303 (add-after
304 'unpack 'apply-afl-patches
305 (lambda* (#:key inputs #:allow-other-keys)
306 (let* ((afl-src (assoc-ref inputs "afl-source"))
307 (patch-dir "qemu_mode/patches"))
308 (copy-recursively (string-append afl-src "/"
309 patch-dir)
310 patch-dir)
311 (install-file
312 (string-append patch-dir
313 "/afl-qemu-cpu-inl.h")
314 ".")
315 (copy-file (string-append afl-src "/config.h")
316 "./afl-config.h")
317 (install-file (string-append afl-src "/types.h")
318 ".")
319 (substitute* "afl-qemu-cpu-inl.h"
320 (("\\.\\./\\.\\./config.h") "afl-config.h"))
321 (substitute* (string-append patch-dir
322 "/cpu-exec.diff")
323 (("\\.\\./patches/") ""))
324
325 ;; These were already applied to qemu-minimal-2.10.
326 (for-each (lambda (obsolete-patch)
327 (delete-file (string-append
328 patch-dir "/"
329 obsolete-patch)))
330 (list "configure.diff"
331 "memfd.diff"))
332
333 (for-each (lambda (patch-file)
334 (invoke "patch" "--force" "-p1"
335 "--input" patch-file))
336 (find-files patch-dir
337 "\\.diff$"))
338 #t)))
339 (add-before 'check 'disable-unusable-tests
340 (lambda* (#:key inputs outputs #:allow-other-keys)
341 (substitute* "tests/Makefile.include"
342 ;; Comment out the test-qga test, which needs /sys and
343 ;; fails within the build environment.
344 (("check-unit-.* tests/test-qga" all)
345 (string-append "# " all)))
346 (substitute* "tests/Makefile.include"
347 ;; Comment out the test-char test, which needs networking and
348 ;; fails within the build environment.
349 (("check-unit-.* tests/test-char" all)
350 (string-append "# " all)))
351 #t)))))
352 (native-inputs
353 `(("python-2" ,python-2) ; QEMU 2 needs Python 2
354 ("glib:bin" ,glib "bin")
355 ("perl" ,perl)
356 ("flex" ,flex)
357 ("bison" ,bison)
358 ("pkg-config" ,pkg-config)))
359 (inputs
360 `(("afl-source" ,(package-source american-fuzzy-lop))
361 ("alsa-lib" ,alsa-lib)
362 ("attr" ,attr)
363 ("glib" ,glib)
364 ("libaio" ,libaio)
365 ("libattr" ,attr)
366 ("libcap" ,libcap)
367 ("libjpeg" ,libjpeg-turbo)
368 ("libpng" ,libpng)
369 ("ncurses" ,ncurses)
370 ("pixman" ,pixman)
371 ("util-linux" ,util-linux)
372 ("zlib" ,zlib)))
373 (home-page "https://www.qemu.org")
374 (synopsis "Machine emulator and virtualizer (without GUI) for american fuzzy lop")
375 (description
376 "QEMU is a generic machine emulator and virtualizer. This package
377of QEMU is used only by the american fuzzy lop package.
378
379When used as a machine emulator, QEMU can run OSes and programs made for one
380machine (e.g. an ARM board) on a different machine---e.g., your own PC. By
381using dynamic translation, it achieves very good performance.
382
383When used as a virtualizer, QEMU achieves near native performances by
384executing the guest code directly on the host CPU. QEMU supports
385virtualization when executing under the Xen hypervisor or using
386the KVM kernel module in Linux. When using KVM, QEMU can virtualize x86,
387server and embedded PowerPC, and S390 guests.")
388 ;; Many files are GPLv2+, but some are GPLv2-only---e.g., `memory.c'.
389 (license license:gpl2)
390 ;; Several tests fail on MIPS.
391 (supported-systems (delete "mips64el-linux" %supported-systems))))))
392
393(define-public stress-make
394 (let ((commit "9e92dff8f0157f012aaf31de5b8b8112ad720100")
395 (revision "1")) ;No official source distribution
396 (package
397 (name "stress-make")
398 (version (git-version "1.0" revision commit))
399 (source
400 (origin
401 (method git-fetch)
402 (uri (git-reference
403 (url "https://github.com/lanl/stress-make.git")
404 (commit commit)))
405 (file-name (git-file-name name version))
406 (sha256
407 (base32
408 "1z1yiwnqyzv3v6152fnjbfh2lr8q8fi5xxfdclnr8l8sd4c1rasp"))))
409 (build-system gnu-build-system)
410 (native-inputs
411 `(("autoconf" ,autoconf)
412 ("automake" ,automake)
413 ("go" ,go)))
414 (inputs
415 `(("make-source" ,(package-source gnu-make))))
416 (arguments
417 ;; stress-make's configure script insists on having a tarball and does
418 ;; not accept a directory name instead. To let the gnu-build-system's
419 ;; patch-* phases work properly, we unpack the source first, then
420 ;; repack before the configure phase.
421 (let ((make-dir (string-append "make-" (package-version gnu-make))))
422 `(#:configure-flags '("--with-make-tar=./make.tar.xz"
423 "make_cv_sys_gnu_glob=yes")
424 #:phases
425 (modify-phases %standard-phases
426 (add-after 'unpack 'unpack-make
427 (lambda* (#:key inputs #:allow-other-keys)
428 (invoke "tar" "xf" (assoc-ref inputs "make-source"))))
429 (add-after 'unpack-make 'set-default-shell
430 (lambda _
431 ;; Taken mostly directly from (@ (gnu packages base) gnu-make)
432 (substitute* (string-append ,make-dir "/job.c")
433 (("default_shell = .*$")
434 (format #f "default_shell = \"~a\";\n"
435 (which "sh"))))))
436 (add-before 'configure 'repack-make
437 (lambda _
438 (invoke "tar" "cJf" "./make.tar.xz" ,make-dir)))
439 (add-before 'build 'setup-go
440 ;; The Go cache is required starting in Go 1.12, and it needs
441 ;; to be writable.
442 (lambda _ (setenv "GOCACHE" "/tmp/go-cache") #t))))))
443 (home-page "https://github.com/lanl/stress-make")
444 (synopsis "Expose race conditions in Makefiles")
445 (description
446 "Stress Make is a customized GNU Make that explicitly manages the order
447in which concurrent jobs are run to provoke erroneous behavior into becoming
448manifest. It can run jobs in the order in which they're launched, in backwards
449order, or in random order. The thought is that if code builds correctly with
450Stress Make, then it is likely that the @code{Makefile} contains no race
451conditions.")
452 ;; stress-make wrapper is under BSD-3-modifications-must-be-indicated,
453 ;; and patched GNU Make is under its own license.
454 (license (list (license:non-copyleft "LICENSE.md")
455 license:gpl3+)))))
456
457(define-public zzuf
458 (package
459 (name "zzuf")
460 (version "0.15")
461 (source
462 (origin
463 (method url-fetch)
464 (uri (string-append
465 "https://github.com/samhocevar/zzuf/releases/download/v"
466 version "/" name "-" version ".tar.gz"))
467 (file-name (string-append name "-" version ".tar.gz"))
468 (sha256
469 (base32
470 "1mpzjaksc2qg2hzqflf39pl06p53qam2dn3hkhkcv6p00d2n4kx3"))))
471 (build-system gnu-build-system)
472 (home-page "https://github.com/samhocevar/zzuf")
473 (synopsis "Transparent application input fuzzer")
474 (description "Zzuf is a transparent application input fuzzer. It works by
475intercepting file operations and changing random bits in the program's
476input. Zzuf's behaviour is deterministic, making it easy to reproduce bugs.")
477 (license license:wtfpl2)))
478
479(define-public scanmem
480 (package
481 (name "scanmem")
482 (version "0.17")
483 (source
484 (origin
485 (method git-fetch)
486 (uri (git-reference
487 (url "https://github.com/scanmem/scanmem")
488 (commit (string-append "v" version))))
489 (file-name (git-file-name name version))
490 (sha256
491 (base32
492 "17p8sh0rj8yqz36ria5bp48c8523zzw3y9g8sbm2jwq7sc27i7s9"))))
493 (build-system gnu-build-system)
494 (arguments
495 `(#:configure-flags '("--enable-gui")
496 #:phases
497 (modify-phases %standard-phases
498 (add-before 'configure 'hardcode-python
499 (lambda* (#:key inputs outputs #:allow-other-keys)
500 (substitute* "gui/GameConqueror.py"
501 (("/usr/bin/env python")
502 (string-append (assoc-ref %build-inputs
503 "python-wrapper") "/bin/python")))
504 #t))
505 (add-after 'install 'wrap-gameconqueror
506 (lambda* (#:key inputs outputs #:allow-other-keys)
507 (let ((out (assoc-ref outputs "out"))
508 (gi-typelib-path (getenv "GI_TYPELIB_PATH"))
509 (python-path (getenv "PYTHONPATH")))
510 (wrap-program (string-append out "/share/gameconqueror/GameConqueror.py")
511 `("GI_TYPELIB_PATH" ":" prefix (,gi-typelib-path))
512 `("PYTHONPATH" ":" prefix (,python-path))))
513 #t)))))
514 (native-inputs
515 `(("libtool" ,libtool)
516 ("python-wrapper" ,python-wrapper)
517 ("gobject-introspection" ,gobject-introspection)
518 ("gtk+" ,gtk+)
519 ("intltool" ,intltool)
520 ("automake" ,automake)
521 ("autoconf" ,autoconf)))
522 (inputs
523 `(("readline" ,readline)))
524 (propagated-inputs
525 `(("python-pygobject" ,python-pygobject)))
526 (home-page "https://github.com/scanmem/scanmem")
527 (synopsis "Memory scanner")
528 (description "Scanmem is a debugging utility designed to isolate the
529address of an arbitrary variable in an executing process. Scanmem simply
530needs to be told the pid of the process and the value of the variable at
531several different times. After several scans of the process, scanmem isolates
532the position of the variable and allows you to modify its value.")
533 ;; The library is covered by LGPLv3 or later; the application is covered
534 ;; by GPLv3 or later.
535 (license (list license:lgpl3+ license:gpl3+))))
536
537(define-public rr
538 (package
539 (name "rr")
540 (version "5.3.0")
541 (source (origin
542 (method git-fetch)
543 (uri (git-reference
544 (url "https://github.com/mozilla/rr")
545 (commit version)))
546 (sha256
547 (base32
548 "1x6l1xsdksnhz9v50p4r7hhmr077cq20kaywqy1jzdklvkjqzf64"))
549 (file-name (git-file-name name version))))
550 (build-system cmake-build-system)
551 (arguments
552 `(#:configure-flags
553 ;; The 'rr_exec_stub' is a static binary, which leads CMake to fail
554 ;; with:
555 ;;
556 ;; file RPATH_CHANGE could not write new RPATH:
557 ;;
558 ;; Clear CMAKE_INSTALL_RPATH to avoid that problem.
559 (list "-DCMAKE_INSTALL_RPATH="
560 ,@(if (and (not (%current-target-system))
561 (member (%current-system)
562 '("x86_64-linux" "aarch64-linux")))
563 ;; The toolchain doesn't support '-m32'.
564 '("-Ddisable32bit=ON")
565 '()))
566
567 ;; XXX: Most tests fail with:
568 ;;
569 ;; rr needs /proc/sys/kernel/perf_event_paranoid <= 1, but it is 2.
570 ;;
571 ;; This setting cannot be changed from the build environment, so skip
572 ;; the tests.
573 #:tests? #f
574
575 #:phases (modify-phases %standard-phases
576 (add-before 'check 'set-home
577 (lambda _
578 ;; Some tests expect 'HOME' to be set.
579 (setenv "HOME" (getcwd))
580 #t)))))
581 (native-inputs
582 `(("pkg-config" ,pkg-config)
583 ("ninja" ,ninja)
584 ("which" ,which)))
585 (inputs
586 `(("gdb" ,gdb)
587 ("cpanproto" ,capnproto)
588 ("python" ,python)
589 ("python-pexpect" ,python-pexpect)))
590 (home-page "https://rr-project.org/")
591 (synopsis "Record and reply debugging framework")
592 (description
593 "rr is a lightweight tool for recording, replaying and debugging
594execution of applications (trees of processes and threads). Debugging extends
595GDB with very efficient reverse-execution, which in combination with standard
596GDB/x86 features like hardware data watchpoints, makes debugging much more
597fun.")
598 (license license:expat)))