Added support to build in Linux RISCV64.

Author: goyox86

.github/workflows/build.yml

@@ -27,6 +27,7 @@ jobs:
           - { os: ubuntu-22.04,   target: linux,   platform: linux-x64,   container: 'alpine:latest', libc: musl }
           - { os: ubuntu-20.04,   target: linux,   platform: linux-x64    }
           - { os: ubuntu-20.04,   target: linux,   platform: linux-arm64  }
+          - { os: ubuntu-20.04,   target: linux,   platform: linux-riscv64 }
           - { os: macos-latest,   target: darwin,  platform: darwin-x64   }
           - { os: macos-latest,   target: darwin,  platform: darwin-arm64 }
           - { os: windows-latest, target: windows, platform: win32-ia32   }
@@ -41,6 +42,12 @@ jobs:
           sudo apt-get update
           sudo apt-get install -y gcc-aarch64-linux-gnu g++-aarch64-linux-gnu
 
+      - name: Install riscv64-linux-gnu
+        if: ${{ matrix.platform == 'linux-riscv64' && matrix.libc != 'musl' }}
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y gcc-riscv64-linux-gnu g++-riscv64-linux-gnu
+
       - name: Prepare container for musl
         if: ${{ matrix.target == 'linux' && matrix.libc == 'musl' }}
         run: |

make/detect_platform.lua

@@ -25,6 +25,8 @@ elseif platform.os == 'linux' then
     elseif lm.platform == "linux-x64" then
     elseif lm.platform == "linux-arm64" then
         lm.cc = 'aarch64-linux-gnu-gcc'
+    elseif lm.platform == "linux-riscv64" then
+        lm.cc = 'riscv64-linux-gnu-gcc'
     else
         error "unknown platform"
     end
@@ -49,6 +51,7 @@ local ARCH <const> = {
     x86_64 = 'x64',
     i686 = 'ia32',
     arm64 = 'arm64',
+    riscv64 = 'riscv64'
 }
 
 local function detectArch()