[bug#53833] [PATCH v2] gnu: Add qbe.

[(unmatched-parenthesis]

* gnu/packages/c.scm (qbe): New variable.

Signed-off-by: (unmatched-parenthesis <paren@disroot.org>
---
This improved patch (1) squashes the three commits together, (2) enables
tests for QBE, and (3) fixes some style nits.

Thanks to lilyp for feedback on #guix!

 gnu/packages/c.scm | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/gnu/packages/c.scm b/gnu/packages/c.scm
index da034d5fd9..c9a25eb801 100644
--- a/gnu/packages/c.scm
+++ b/gnu/packages/c.scm
@@ -13,6 +13,7 @@
 ;;; Copyright © 2020, 2021 Greg Hogan <code@greghogan.com>
 ;;; Copyright © 2021 David Dashyan <mail@davie.li>
 ;;; Copyright © 2021 Foo Chuan Wei <chuanwei.foo@hotmail.com>
+;;; Copyright © 2022 (unmatched parenthesis <paren@disroot.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -1064,3 +1065,46 @@ (define-public utf8-h
 C and C++.  The functions it provides are like those from the C header
 string.h, but with a utf8* prefix instead of the str* prefix.")
       (license license:unlicense))))
+
+(define-public qbe
+  (let ((commit "2caa26e388b1c904d2f12fb09f84df7e761d8331")
+        (revision "1"))
+   (package
+    (name "qbe")
+    (version (git-version "0.0" revision commit))
+    (source
+     (origin
+      (method git-fetch)
+      (uri (git-reference
+            (url "git://c9x.me/qbe")
+            (commit commit)))
+      (file-name (git-file-name name version))
+      (sha256
+       (base32 "1gv03ym0gqrl4wkbhysa82025xwrkr1fg44z814b6vnggwlqgljc"))))
+    (build-system gnu-build-system)
+    (arguments
+     (list #:make-flags
+           #~(list (string-append "CC=" #$(cc-for-target))
+                   (string-append "PREFIX=" #$output)
+                   ;; `GUIXTARGET` is used instead of `TARGET` to avoid 
changing
+                   ;; the meaning of tools/test.sh (which uses `TARGET` too).
+                   (string-append "GUIXTARGET=" #$(or (%current-target-system)
+                                                      (%current-system))))
+           #:phases
+           #~(modify-phases %standard-phases
+               (add-after 'unpack 'allow-cross-compilation
+                 (lambda _
+                   (substitute* "Makefile"
+                     (("`uname -m`") "$(GUIXTARGET)"))))
+               (add-after 'allow-cross-compilation 'use-gcc-for-tests
+                 (lambda _
+                   (substitute* "tools/test.sh"
+                     (("cc=\"cc -no-pie\"")
+                      (string-append "cc=\"${CC} -no-pie\"")))))
+               (delete 'configure))))
+    (supported-systems (list "x86_64-linux" "aarch64-linux" "riscv64-linux"))
+    (synopsis "Simple compiler backend")
+    (description "QBE is a small compiler backend using an SSA-based 
intermediate
+language as input.")
+    (home-page "https://c9x.me/compile/";)
+    (license license:expat))))
-- 
2.36.0