[bug#50449] [PATCH] Add zig

[Andrew Patterson <andrewpatt7@gmail.com>]

---
Confusion between my main guix install and what I'm working on led to
issues.

Current status as to the Submitting Paches checklist in the info page:
1. That's the hash for 0.7.1
2. I've added a synopsis and description
3. I don't know what ~guix lint~'s complaint that "the source file name
should contain the package name" means; otherwise, it's fine
4. It builds on x64 linux.
5. I haven't tried to build it on other platforms; the inputs might need
to be native-inputs, but I'm not sure
6. It has a bundled libc, but that's because zig has a c compiler built
in for some reason.
7. The ~guix size~ output seems reasonable.
8. There shouldn't be any dependent packages, since it's new.
9. ~guix build --rounds=2 zig~ worked fine.
10. Not relevant.
11. The patch is all adding zig.
12. I wrote the patch in emacs, so the indentation should be fine.
13. I don't think there are mirror urls for github?

 gnu/packages/zig.scm | 91 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 gnu/packages/zig.scm

diff --git a/gnu/packages/zig.scm b/gnu/packages/zig.scm
new file mode 100644
index 0000000000..ba48fcf51f
--- /dev/null
+++ b/gnu/packages/zig.scm
@@ -0,0 +1,91 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2021 Andrew Patterson <andrewpatt7@gmail.com>
+;;;
+;;; 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 packages zig)
+  #:use-module (guix packages)
+  #:use-module (guix git-download)
+  #:use-module (guix build-system cmake)
+  #:use-module ((guix licenses) #:prefix l:)
+  #:use-module (guix build utils)
+  #:use-module (gnu packages)
+  #:use-module (gnu packages llvm)
+  #:use-module (guix utils))
+
+;; Zig versions depend on specific LLVM major versions; should be able to update
+;; to 0.8.x with lld@12
+(define-public zig
+  (package
+    (name "zig")
+    (version "0.7.1")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/ziglang/zig")
+             (commit version)))
+       (sha256
+        (base32
+         "1z6c4ym9jmga46cw2arn7zv2drcpmrf3vw139gscxp27n7q2z5md"))))
+    (build-system cmake-build-system)
+    (inputs
+     `(("llvm" ,llvm-11)
+       ("clang-toolchain" ,clang-toolchain-11)
+       ("lld" ,lld))) ; is currently version 11
+    (arguments
+     `(#:tests? #f
+       #:phases (modify-phases %standard-phases
+                  (add-before 'install 'set-cachedir
+                    (lambda* _ ;; See [[https://github.com/ziglang/zig/issues/6810]]
+                      (setenv "XDG_CACHE_HOME" "/tmp/"))))))
+    (home-page "https://ziglang.org/")
+    (synopsis
+     "Programming language for maintaining robust, optimal, and reusable software")
+    (description
+     "Zig is a general-purpose programming language and toolchain for
+maintaining robust, optimal, and reusable software.
+
+⚡ A Simple Language
+
+Focus on debugging your application rather than debugging your programming
+language knowledge.
+@itemize @bullet
+@item No hidden control flow.
+@item No hidden memory allocations.
+@item No preprocessor, no macros.
+@end itemize
+
+⚡ Comptime
+
+A fresh approach to metaprogramming based on compile-time code execution and
+lazy evaluation.
+@itemize @bullet
+@item Call any function at compile-time.
+@item Manipulate types as values without runtime overhead.
+@item Comptime emulates the target architecture.
+@end itemize
+
+⚡ Performance Meets Safety
+
+Write fast, clear code capable of handling all error conditions.
+@itemize @bullet
+@item The language gracefully guides your error handling logic.
+@item Configurable runtime checks help you strike a balance between performance
+and safety guarantees.
+@item Take advantage of vector types to express SIMD instructions portably.
+@end itemize")
+    (license l:expat)))
-- 
2.33.0