[bug#46163] [PATCH] staging gnu: Add wasm32 target to rustc.

[John Soo <jsoo1@asu.edu>]

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Hi Guix!

Recently I had to work with some webassembly and rust and our current
compiler did not support the target. This patch adds wasm32 support.

Kindly,

John


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From ab40dbfd2db1a06939c353d7cb0cb64841dbaa35 Mon Sep 17 00:00:00 2001
From: John Soo <jsoo1@asu.edu>
Date: Sat, 23 Jan 2021 08:43:52 -0800
Subject: [PATCH] gnu: Add wasm32 target to rust@1.46.

* gnu/packages/rust.scm (rust-1.46): [arguments] Add wasm32 to target
configuration, [native-inputs] Add node for tests.
---
 gnu/packages/rust.scm | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/gnu/packages/rust.scm b/gnu/packages/rust.scm
index 98ae770745..7b40372cb2 100644
--- a/gnu/packages/rust.scm
+++ b/gnu/packages/rust.scm
@@ -1349,7 +1349,21 @@ move around."
                  (generate-all-checksums "vendor")
                  #t))
              (replace 'build
-               (lambda* _
+               (lambda* (#:key inputs #:allow-other-keys)
+                 (substitute* "config.toml"
+                   (("\\[build\\]" all)
+                    (string-append all "
+target = [\"" ,(nix-system->gnu-triplet-for-rust) "\", \"wasm32-unknown-unknown\"]
+"))
+                   (("\\[dist\\]" all)
+                    (string-append "
+[target.wasm32-unknown-unknown]
+llvm-config = \"" (assoc-ref inputs "llvm") "/bin/llvm-config\"
+cc = \"" (assoc-ref inputs "gcc") "/bin/gcc\"
+cxx = \"" (assoc-ref inputs "gcc") "/bin/g++\"
+ar = \"" (assoc-ref inputs "binutils") "/bin/ar\"
+"
+all)))
                  (invoke "./x.py" "build")
                  (invoke "./x.py" "build" "src/tools/cargo")
                  (invoke "./x.py" "build" "src/tools/rustfmt")
@@ -1364,7 +1378,9 @@ move around."
                         (string-append "-j" (number->string
                                              (min 4
                                                   (parallel-job-count))))))
-                   (invoke "./x.py" parallel-job-spec "test" "-vv")
+                   (invoke "./x.py" parallel-job-spec "test"
+                           (string-append "--target=" ,(nix-system->gnu-triplet-for-rust))
+                           "-vv")
                    (invoke "./x.py" parallel-job-spec "test"
                            "src/tools/cargo")
                    (invoke "./x.py" parallel-job-spec "test"
-- 
2.30.0


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