Add riscv64 info and simplify macos (#394)

Simplify macos checks by just using CMAKE_SYSTME_PROCESSOR and add in
riscv64

---------

Co-authored-by: Chris Marslender <chrismarslender@gmail.com>

.github/workflows/build-test-riscv64.yml

@@ -0,0 +1,59 @@
+name: Build and test riscv64 on ubuntu-latest
+
+on:
+  push:
+    branches:
+      - main
+      - dev
+    tags:
+        - '**'
+  pull_request:
+    branches:
+      - '**'
+
+jobs:
+  build:
+    timeout-minutes: 60
+    name: QEMU riscv64 via Debian on ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ ubuntu-latest ]
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v3
+      with:
+        fetch-depth: 1
+
+    - name: Set up QEMU on x86_64
+      if: startsWith(matrix.os, 'ubuntu-latest')
+      id: qemu
+      uses: docker/setup-qemu-action@v2
+      with:
+        platforms: riscv64
+#        image: tonistiigi/binfmt:latest
+
+    - name: Build and Test
+      run: |
+        docker run --rm --platform linux/riscv64 \
+          -v ${{ github.workspace }}:/ws --workdir=/ws \
+          riscv64/debian:rc-buggy \
+          bash -exc '\
+            apt-get update && \
+            apt-get install -y cmake build-essential git python3-full python3-pip python3-dev && \
+            cmake --version && \
+            uname -a && \
+            export CP_USE_GREEN_REAPER=0 && \
+            pip wheel -w dist . && \
+            python3 -m venv venv && \
+            ./venv/bin/python -m pip install dist/*.whl && \
+            ./venv/bin/python -m pip install pytest && \
+            ./venv/bin/python -m pytest -k "not k_21" -v tests/ 
+          '
+
+    - name: Upload artifacts
+      uses: actions/upload-artifact@v3
+      with:
+        name: packages
+        path: ./dist

CMakeLists.txt

@@ -123,15 +123,6 @@ set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O2 -fno-omit-frame-pointer -fsanitize=thre
 set (CMAKE_LINKER_FLAGS "${CMAKE_LINKER_FLAGS} -fno-omit-frame-pointer -fsanitize=thread")
 ENDIF()
 
-IF (APPLE)
-# on macOS "uname -m" returns the architecture (x86_64 or arm64)
-execute_process(
-    COMMAND uname -m
-    RESULT_VARIABLE result
-    OUTPUT_VARIABLE OSX_NATIVE_ARCHITECTURE
-    OUTPUT_STRIP_TRAILING_WHITESPACE)
-ENDIF()
-
 IF (WIN32)
 set(BLAKE3_SRC
     src/b3/blake3.c
@@ -141,7 +132,7 @@ set(BLAKE3_SRC
     src/b3/blake3_avx512.c
     src/b3/blake3_sse41.c
 )
-ELSEIF(OSX_NATIVE_ARCHITECTURE STREQUAL "arm64")
+ELSEIF(CMAKE_SYSTEM_PROCESSOR MATCHES "riscv64|arm64")
 set(BLAKE3_SRC
     src/b3/blake3.c
     src/b3/blake3_portable.c