feat: add support to x64 systems using musl

BUILD.md

@@ -116,4 +116,9 @@ If you are using Mac and openjdk7 (or higher), use the following option:
 
     $ make native LIBNAME=libsnappyjava.dylib
 
+## Building with Alpine
+This project supports Alpine-based container images, which use the musl libc implementation. When building on Alpine, be aware that:
 
+- All required dependencies are compatible with musl libc
+- The build process has been tested and verified on Alpine environments
+- No additional configuration is needed for Alpine compatibility

Makefile

@@ -151,7 +151,7 @@ native: jni-header snappy-header $(NATIVE_DLL)
 native-nocmake: jni-header $(NATIVE_DLL)
 snappy: native $(TARGET)/$(snappy-jar-version).jar
 
-native-all: native native-arm clean-docker mac64 win32 win64 linux32 linux64 linux-ppc64le linux-riscv64 linux-s390x
+native-all: native native-arm clean-docker mac64 win32 win64 linux32 linux64 linux-ppc64le linux-riscv64 linux-s390x musl-image musl
 
 ifdef CI
 # Clean docker images within CI to avoid no space left error
@@ -199,6 +199,12 @@ linux32: jni-header
 linux64: jni-header
 	docker run $(DOCKER_RUN_OPTS) -i -v $$PWD:/work xerial/centos5-linux-x86_64-pic bash -c 'make clean-native native-nocmake OS_NAME=Linux OS_ARCH=x86_64'
 
+musl-image:
+	docker build -f docker/Dockerfile.linux-x86_64-musl -t snappy-java-musl .
+
+musl: jni-header
+	docker run $(DOCKER_RUN_OPTS) -i -v $$PWD:/work snappy-java-musl bash -c 'make clean-native native-nocmake OS_NAME=Linux OS_ARCH=x86_64-musl'
+
 freebsd64:
 	$(MAKE) native OS_NAME=FreeBSD OS_ARCH=x86_64
 

Makefile.common

@@ -6,7 +6,6 @@ ifndef JAVA_HOME
 $(warning Set JAVA_HOME environment variable)
 endif
 
-
 JAVA  := "$$JAVA_HOME/bin/java"
 JAVAC := "$$JAVA_HOME/bin/javac"
 JAVAH := "$$JAVA_HOME/bin/javah"
@@ -51,7 +50,7 @@ endif
 # os=Default is meant to be generic unix/linux
 
 # To support new CPU architecture, add a new target name here
-known_os_archs := Linux-x86 Linux-x86_64 Linux-arm Linux-armv6 Linux-armv7 Linux-android-arm Linux-android-aarch64 Linux-aarch64 Linux-ppc Linux-ppc64 Linux-ppc64le Linux-s390 Linux-s390x Mac-x86 Mac-x86_64 Mac-aarch64 FreeBSD-x86_64 Windows-x86 Windows-x86_64 Windows-aarch64 SunOS-x86 SunOS-sparc SunOS-x86_64 AIX-ppc AIX-ppc64 Linux-riscv Linux-riscv64 Linux-loongarch Linux-loongarch64
+known_os_archs := Linux-x86_64-musl Linux-x86 Linux-x86_64 Linux-arm Linux-armv6 Linux-armv7 Linux-android-arm Linux-android-aarch64 Linux-aarch64 Linux-ppc Linux-ppc64 Linux-ppc64le Linux-s390 Linux-s390x Mac-x86 Mac-x86_64 Mac-aarch64 FreeBSD-x86_64 Windows-x86 Windows-x86_64 Windows-aarch64 SunOS-x86 SunOS-sparc SunOS-x86_64 AIX-ppc AIX-ppc64 Linux-riscv Linux-riscv64 Linux-loongarch Linux-loongarch64
 os_arch := $(OS_NAME)-$(OS_ARCH)
 IBM_JDK_7 := $(findstring IBM, $(shell $(JAVA) -version 2>&1 | grep IBM | grep "JRE 1.7"))
 
@@ -103,6 +102,17 @@ Linux-x86_64_LINKFLAGS := -shared -static-libgcc -static-libstdc++
 Linux-x86_64_LIBNAME   := libsnappyjava.so
 Linux-x86_64_SNAPPY_FLAGS  :=
 
+Linux-x86_64-musl_CXX       := $(CROSS_PREFIX)g++
+Linux-x86_64-musl_STRIP     := $(CROSS_PREFIX)strip
+ifeq ($(IBM_JDK_7),)
+  Linux-x86_64-musl_CXXFLAGS  := -Ilib/inc_linux -I$(JAVA_HOME)/include -O2 -fPIC -fvisibility=hidden -m64 -std=c++11
+else
+  Linux-x86_64-musl_CXXFLAGS  := -include $(IBM_JDK_LIB)/jni_md.h -include $(IBM_JDK_LIB)/jniport.h -I$(JAVA_HOME)/include -O2 -fPIC -fvisibility=hidden -m64 -std=c++11
+endif
+Linux-x86_64-musl_LINKFLAGS := -shared -static-libgcc -static-libstdc++
+Linux-x86_64-musl_LIBNAME   := libsnappyjava.so
+Linux-x86_64-musl_SNAPPY_FLAGS  :=
+
 Linux-ppc_CXX         := g++
 Linux-ppc_STRIP       := strip
 ifeq ($(IBM_JDK_7),)

build.sbt

@@ -111,6 +111,7 @@ OsgiKeys.additionalHeaders := Map(
     "org/xerial/snappy/native/Linux/ppc64/libsnappyjava.so;osname=linux;processor=ppc64le",
     "org/xerial/snappy/native/Linux/s390x/libsnappyjava.so;osname=linux;processor=s390x",
     "org/xerial/snappy/native/Linux/loongarch64/libsnappyjava.so;osname=linux;processor=loongarch64",
+    "org/xerial/snappy/native/Linux/x86_64-musl/libsnappyjava.so;osname=Linux;processor=x86-64-musl",
     "org/xerial/snappy/native/AIX/ppc/libsnappyjava.a;osname=aix;processor=ppc",
     "org/xerial/snappy/native/AIX/ppc64/libsnappyjava.a;osname=aix;processor=ppc64",
     "org/xerial/snappy/native/SunOS/x86/libsnappyjava.so;osname=sunos;processor=x86",

docker/Dockerfile.linux-x86_64-musl

@@ -0,0 +1,36 @@
+FROM alpine:3.18
+
+# Set workspace directory
+WORKDIR /work
+
+# Copy the project to the container
+COPY . .
+
+# Install build dependencies
+RUN apk add --no-cache \
+    openjdk8 \
+    cmake \
+    make \
+    gcc \
+    g++ \
+    musl-dev \
+    linux-headers \
+    git \
+    util-linux \
+    bash \
+    curl
+
+# Install SBT
+RUN curl -L "https://github.com/sbt/sbt/releases/download/v1.9.7/sbt-1.9.7.tgz" | tar xz -C /usr/local
+ENV PATH="/usr/local/sbt/bin:${PATH}"
+
+# Install python/pip
+ENV PYTHONUNBUFFERED=1
+RUN apk add --update --no-cache python3 && ln -sf python3 /usr/bin/python
+RUN python3 -m ensurepip
+RUN pip3 install --no-cache --upgrade pip setuptools
+
+# Set Env Vars
+ENV CC=gcc CXX=g++
+ENV JAVA_HOME=/usr/lib/jvm/java-1.8-openjdk
+ENV PATH="${JAVA_HOME}/bin:${PATH}"

src/main/java/org/xerial/snappy/OSInfo.java

@@ -25,6 +25,7 @@
 package org.xerial.snappy;
 
 import java.io.ByteArrayOutputStream;
+import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.HashMap;
@@ -215,6 +216,10 @@ public static String getArchName() {
             return "android-arm";
         }
 
+        if (isX64Musl()) {
+            return "x86_64-musl";
+        }
+
         if(osArch.startsWith("arm")) {
             osArch = resolveArmArchType();
         }
@@ -226,6 +231,15 @@ public static String getArchName() {
         return translateArchNameToFolderName(osArch);
     }
 
+    private static boolean isX64Musl() {
+        try {
+            return new File("/lib/ld-musl-x86_64.so.1").exists();
+        } 
+        catch (Exception e) {
+            return false;
+        }
+    }
+
     static String translateOSNameToFolderName(String osName) {
         if(osName.contains("Windows")) {
             return "Windows";