Add support for linuxstatic armv7 binaries

.github/workflows/build-linuxstatic.yml

@@ -11,12 +11,17 @@ jobs:
       fail-fast: false
       matrix:
         target-node: [10, 12, 14, 16]
-        target-arch: [x64, arm64]
+        target-arch: [x64, arm64, armv7]
         include:
           - target-arch: x64
-            target-toolchain: x86_64
+            target-triple: x86_64-linux-musl
+            host-arch: x86_64
           - target-arch: arm64
-            target-toolchain: aarch64
+            target-triple: aarch64-linux-musl
+            host-arch: x86_64
+          - target-arch: armv7
+            target-triple: armv7l-linux-musleabihf
+            host-arch: i686
 
     steps:
       - uses: actions/checkout@v2
@@ -28,7 +33,8 @@ jobs:
         uses: docker/build-push-action@v2
         with:
           build-args: |
-            TARGET_TOOLCHAIN_ARCH=${{ matrix.target-toolchain }}
+            HOST_ARCH=${{ matrix.host-arch }}
+            TARGET_TRIPLE=${{ matrix.target-triple }}
             PKG_FETCH_OPTION_a=${{ matrix.target-arch }}
             PKG_FETCH_OPTION_n=node${{ matrix.target-node }}
             PKG_FETCH_OPTION_p=linuxstatic

Dockerfile.alpine

@@ -1,6 +1,7 @@
-ARG TARGET_TOOLCHAIN_ARCH
+ARG HOST_ARCH=x86_64
+ARG TARGET_TRIPLE=aarch64-linux-musl
 
-FROM muslcc/x86_64:$TARGET_TOOLCHAIN_ARCH-linux-musl
+FROM muslcc/$HOST_ARCH:$TARGET_TRIPLE
 
 ARG PKG_FETCH_OPTION_a
 ARG PKG_FETCH_OPTION_n

lib/build.ts

@@ -179,6 +179,15 @@ async function compileOnUnix(
     args.push('--dest-cpu', cpu);
   }
 
+  if (targetArch === 'armv7') {
+    const { CFLAGS = '', CXXFLAGS = '' } = process.env;
+    process.env.CFLAGS = `${CFLAGS} -marm -mcpu=cortex-a7`;
+    process.env.CXXFLAGS = `${CXXFLAGS} -marm -mcpu=cortex-a7`;
+
+    args.push('--with-arm-float-abi=hard');
+    args.push('--with-arm-fpu=vfpv3');
+  }
+
   if (hostArch !== targetArch) {
     log.warn('Cross compiling!');
     log.warn('You are responsible for appropriate env like CC, CC_host, etc.');