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system: Modify GDB skeleton to find debug files for any profile.

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Instead of hard coding the debug directory to that of the user profile, use
Guile scripting in combination with a new search path specification on GDB to
specify the debug file directories.

* gnu/packages/gdb.scm (gdb-9.1): Add a search path specification for the
GDB_DEBUG_FILE_DIRECTORY environment variable.
* gnu/system/shadow.scm (default-skeletons)[gdbinit]: Derive the value of
DEBUG-FILE-DIRECTORY via the GDB_DEBUG_FILE_DIRECTORY environment variable.
* doc/guix.texi (Installing Debugging Files): Document it.
This commit is contained in:
Maxim Cournoyer 2020-08-16 01:24:05 -04:00
parent 8b074a0abe
commit 720a4adc91
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3 changed files with 28 additions and 1 deletions
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14
doc/guix.texi
View file

@ -29919,6 +29919,20 @@ GDB}):
From there on, GDB will pick up debugging information from the
@file{.debug} files under @file{~/.guix-profile/lib/debug}.
Below is an alternative GDB script which is useful when working with
other profiles. It takes advantage of the optional Guile integration in
GDB. This snippet is included by default on Guix System in the
@file{~/.gdbinit} file.
@example
guile
(use-modules (gdb))
(execute (string-append "set debug-file-directory "
(or (getenv "GDB_DEBUG_FILE_DIRECTORY")
"~/.guix-profile/lib/debug")))
end
@end example
In addition, you will most likely want GDB to be able to show the source
code being debugged. To do that, you will have to unpack the source
code of the package of interest (obtained with @code{guix build

7
gnu/packages/gdb.scm
View file

@ -5,6 +5,7 @@
;;; Copyright © 2020 Marius Bakke <mbakke@fastmail.com>
;;; Copyright © 2020 Vincent Legoll <vincent.legoll@gmail.com>
;;; Copyright © 2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
;;; Copyright © 2020 Maxim Cournoyer <maxim.cournoyer@gmail.com>
;;;
;;; This file is part of GNU Guix.
;;;
@ -117,6 +118,12 @@ (define-public gdb-9.1
("dejagnu" ,dejagnu)
("pkg-config" ,pkg-config)
,@(if (hurd-target?) `(("mig" ,mig)) '())))
;; TODO: Add support for the GDB_DEBUG_FILE_DIRECTORY environment variable
;; in GDB itself instead of relying on some glue code in the Guix-provided
;; .gdbinit file.
(native-search-paths (list (search-path-specification
(variable "GDB_DEBUG_FILE_DIRECTORY")
(files '("lib/debug")))))
(home-page "https://www.gnu.org/software/gdb/")
(synopsis "The GNU debugger")
(description

8
gnu/system/shadow.scm
View file

@ -3,6 +3,7 @@
;;; Copyright © 2016 Alex Griffin <a@ajgrf.com>
;;; Copyright © 2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
;;; Copyright © 2020 Efraim Flashner <efraim@flashner.co.il>
;;; Copyright © 2020 Maxim Cournoyer <maxim.cournoyer@gmail.com>
;;;
;;; This file is part of GNU Guix.
;;;
@ -162,7 +163,12 @@ (define (default-skeletons)
XTerm*metaSendsEscape: true\n"))
(gdbinit (plain-file "gdbinit" "\
# Tell GDB where to look for separate debugging files.
set debug-file-directory ~/.guix-profile/lib/debug
guile
(use-modules (gdb))
(execute (string-append \"set debug-file-directory \"
(or (getenv \"GDB_DEBUG_FILE_DIRECTORY\")
\"~/.guix-profile/lib/debug\")))
end
# Authorize extensions found in the store, such as the
# pretty-printers of libstdc++.