Subject: [PATCH 2/4] gnu: Add wasm32-wasi-clang-runtime.

From: Ian Eure <[email-masked]>
Date: Tue, 8 Apr 2025 12:58:27 -0700

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

Change-Id: Ib0465fdc86086451782d533380a8966cdde6dc1e
---
 gnu/packages/wasm.scm | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/gnu/packages/wasm.scm b/gnu/packages/wasm.scm
index 060e1e420f..53ea31f4a7 100644
--- a/gnu/packages/wasm.scm
+++ b/gnu/packages/wasm.scm
@@ -76,3 +76,33 @@ (define-public wasi-libc
               license:bsd-2
               ;; For wasi-libc and musl-libc.
               license:expat))))
+
+(define-public wasm32-wasi-clang-runtime
+  (package (inherit clang-runtime-16)
+    (native-inputs
+     (list clang-16
+           wasi-libc))
+    (inputs (list llvm-16))
+    (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.
+              "../source/compiler-rt/lib/builtins")))))
-- 
2.49.0