From: soeren@soeren-tempel.net
To: 65486@debbugs.gnu.org
Cc: ludo@gnu.org
Subject: [bug#65486] [PATCH v3] syscalls: Add support for musl libc
Date: Sun, 17 Sep 2023 17:21:49 +0200 [thread overview]
Message-ID: <20230917152149.8587-2-soeren@soeren-tempel.net> (raw)
In-Reply-To: <20230917152149.8587-1-soeren@soeren-tempel.net>
From: Sören Tempel <soeren@soeren-tempel.net>
This commit allows using Guix on a foreign distro which uses musl libc,
for example, Alpine Linux. Usage of musl libc is detected via a new
musl-libc? variable using the Guile %host-type.
Using the new musl-libc? variable, we can now implement musl-specific
quirks. The two compatibility problems I encountered in this regard are
that musl dose not export a readdir64 and statfs64 symbol. On musl,
these two functions are implemented as CPP macros that expand to
readdir/statfs. To workaround that, a case-distinction was added.
The existing linux? variable has been modified to return true if the
%host-system contains "linux-" in order to ensure it is true for both
linux-gnu as well as linux-musl host systems.
The patch has been tested on Alpine Linux and is already used for the
downstream Guix package shipped in Alpine Linux's package repository.
* guix/build/syscalls.scm (musl-libc?): New variable.
* guix/build/syscalls.scm (linux?): Truth value on any linux system.
* guix/build/syscalls.scm (readdir-procedure): Support musl libc.
* guix/build/syscalls.scm (statfs): Support musl libc.
Signed-off-by: Sören Tempel <soeren@soeren-tempel.net>
---
guix/build/syscalls.scm | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/guix/build/syscalls.scm b/guix/build/syscalls.scm
index c9c0bf594d..b845b8aab9 100644
--- a/guix/build/syscalls.scm
+++ b/guix/build/syscalls.scm
@@ -836,7 +836,8 @@ (define-record-type <file-system>
(define-syntax fsword ;fsword_t
(identifier-syntax long))
-(define linux? (string-contains %host-type "linux-gnu"))
+(define musl-libc? (string-contains %host-type "linux-musl"))
+(define linux? (string-contains %host-type "linux-"))
(define-syntax define-statfs-flags
(syntax-rules (linux hurd)
@@ -905,7 +906,7 @@ (define-c-struct %statfs ;<bits/statfs.h>
(spare (array fsword 4)))
(define statfs
- (let ((proc (syscall->procedure int "statfs64" '(* *))))
+ (let ((proc (syscall->procedure int (if musl-libc? "statfs" "statfs64") '(* *))))
(lambda (file)
"Return a <file-system> data structure describing the file system
mounted at FILE."
@@ -1232,7 +1233,7 @@ (define closedir*
(define (readdir-procedure name-field-offset sizeof-dirent-header
read-dirent-header)
- (let ((proc (syscall->procedure '* "readdir64" '(*))))
+ (let ((proc (syscall->procedure '* (if musl-libc? "readdir" "readdir64") '(*))))
(lambda* (directory #:optional (pointer->string pointer->string/utf-8))
(let ((ptr (proc directory)))
(and (not (null-pointer? ptr))
next prev parent reply other threads:[~2023-09-17 15:23 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-24 6:33 [bug#65486] [PATCH] syscalls: Add support for musl libc soeren
2023-09-09 13:04 ` [bug#65486] [PATCH v2] " soeren
2023-09-11 21:09 ` [bug#65486] [PATCH] " Ludovic Courtès
2023-09-13 10:23 ` Sören Tempel
2023-09-13 20:39 ` Ludovic Courtès
2023-09-15 10:57 ` Sören Tempel
2023-09-17 10:14 ` bug#65486: " Ludovic Courtès
2023-09-17 10:17 ` [bug#65486] " Ludovic Courtès
2023-09-17 11:38 ` Christopher Baines
2023-09-17 15:21 ` [bug#65486] [PATCH v3] syscalls: Consistently use existing linux? definition soeren
2023-09-17 15:21 ` soeren [this message]
2023-09-30 10:16 ` [bug#65486] [PATCH] syscalls: Add support for musl libc Sören Tempel
2023-10-10 17:15 ` Christopher Baines
2023-10-23 10:11 ` Ludovic Courtès
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