From 1166f2979dde8dc5622ef0d5e2020a6239ca453a Mon Sep 17 00:00:00 2001
From: Pierre Langlois <pierre.langlois@gmx.com>
Date: Mon, 17 Jan 2022 19:10:18 +0000
Subject: [PATCH] nongnu: Add wasm32-wasi-clang-runtime.

* nongnu/packages/wasm.scm (wasm32-wasi-clang-runtime): New variable.

Signed-off-by: Jonathan Brielmaier <jonathan.brielmaier@web.de>
---
 nongnu/packages/wasm.scm | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/nongnu/packages/wasm.scm b/nongnu/packages/wasm.scm
index b238a46..6d9fe5e 100644
--- a/nongnu/packages/wasm.scm
+++ b/nongnu/packages/wasm.scm
@@ -72,3 +72,35 @@ other APIs.")
                 license:bsd-2
                 ;; For wasi-libc and musl-libc.
                 license:expat)))))
+
+(define-public wasm32-wasi-clang-runtime
+  (package (inherit clang-runtime-13)
+    (native-inputs
+     (list clang-13
+           wasi-libc))
+    (inputs (list llvm-13))
+    (arguments
+     (list
+      #:build-type "Release"
+      #:tests? #f
+      ;; Stripping binaries breaks wasm linking, resulting in the following
+      ;; error: "archive has no index; run ranlib to add one".
+      #:strip-binaries? #f
+      #:configure-flags
+      #~(list "-DCMAKE_C_COMPILER=clang"
+              "-DCMAKE_C_COMPILER_TARGET=wasm32-wasi"
+              (string-append
+               "-DCMAKE_SYSROOT=" #$wasi-libc "/wasm32-wasi")
+              (string-append
+               "-DCMAKE_C_FLAGS=-I " #$wasi-libc "/wasm32-wasi/include")
+
+              "-DCOMPILER_RT_OS_DIR=wasi"
+
+              "-DCOMPILER_RT_BAREMETAL_BUILD=On"
+              "-DCOMPILER_RT_DEFAULT_TARGET_ONLY=On"
+
+              ;; WASM only needs libclang_rt.builtins-wasm32.a from
+              ;; compiler-rt.
+              (string-append "../compiler-rt-"
+                             #$(package-version clang-runtime-13)
+                             ".src/lib/builtins"))))))