refactor: replace SPC_LIBC with SPC_TARGET and update related logic

.github/workflows/tests.yml

@@ -105,7 +105,7 @@ jobs:
         run: composer install -q --no-ansi --no-interaction --no-scripts --no-progress --prefer-dist
 
       - name: "Run PHPUnit Tests"
-        run: SPC_LIBC=glibc vendor/bin/phpunit tests/ --no-coverage
+        run: SPC_TARGET=glibc vendor/bin/phpunit tests/ --no-coverage
 
   define-matrix:
     name: "Define Matrix"

bin/build-static-frankenphp

@@ -92,7 +92,7 @@ ADD ./bin/spc /app/bin/spc
 RUN /app/bin/setup-runtime
 RUN /app/bin/php /app/bin/composer install --no-dev --classmap-authoritative
 ENV PATH="/app/bin:/cmake/bin:/usr/local/go/bin:$PATH"
-ENV SPC_LIBC=glibc
+ENV SPC_TARGET=glibc
 
 ADD ./config/env.ini /app/config/env.ini
 RUN bin/spc doctor --auto-fix --debug
@@ -146,7 +146,7 @@ echo 'CXX=/opt/rh/devtoolset-10/root/usr/bin/g++' >> /tmp/spc-gnu-docker.env
 echo 'AR=/opt/rh/devtoolset-10/root/usr/bin/ar' >> /tmp/spc-gnu-docker.env
 echo 'LD=/opt/rh/devtoolset-10/root/usr/bin/ld' >> /tmp/spc-gnu-docker.env
 echo 'SPC_DEFAULT_C_FLAGS=-fPIE -fPIC' >> /tmp/spc-gnu-docker.env
-echo 'SPC_LIBC=glibc' >> /tmp/spc-gnu-docker.env
+echo 'SPC_TARGET=glibc' >> /tmp/spc-gnu-docker.env
 echo 'SPC_CMD_VAR_PHP_MAKE_EXTRA_LDFLAGS_PROGRAM="-Wl,-O1 -pie"' >> /tmp/spc-gnu-docker.env
 echo 'SPC_CMD_VAR_PHP_MAKE_EXTRA_LIBS="-ldl -lpthread -lm -lresolv -lutil -lrt"' >> /tmp/spc-gnu-docker.env
 

bin/spc-gnu-docker

@@ -108,7 +108,7 @@ ADD ./bin/spc /app/bin/spc
 RUN /app/bin/setup-runtime
 RUN /app/bin/php /app/bin/composer install --no-dev
 ENV PATH="/app/bin:/cmake/bin:$PATH"
-ENV SPC_LIBC=glibc
+ENV SPC_TARGET=glibc
 
 ADD ./config/env.ini /app/config/env.ini
 RUN CC=gcc bin/spc doctor --auto-fix --debug
@@ -159,7 +159,7 @@ echo 'CXX=/opt/rh/devtoolset-10/root/usr/bin/g++' >> /tmp/spc-gnu-docker.env
 echo 'AR=/opt/rh/devtoolset-10/root/usr/bin/ar' >> /tmp/spc-gnu-docker.env
 echo 'LD=/opt/rh/devtoolset-10/root/usr/bin/ld' >> /tmp/spc-gnu-docker.env
 echo 'SPC_DEFAULT_C_FLAGS=-fPIC' >> /tmp/spc-gnu-docker.env
-echo 'SPC_LIBC=glibc' >> /tmp/spc-gnu-docker.env
+echo 'SPC_TARGET=glibc' >> /tmp/spc-gnu-docker.env
 echo 'SPC_CMD_VAR_PHP_MAKE_EXTRA_LDFLAGS_PROGRAM="-Wl,-O1 -pie"' >> /tmp/spc-gnu-docker.env
 echo 'SPC_CMD_VAR_PHP_MAKE_EXTRA_LIBS="-ldl -lpthread -lm -lresolv -lutil -lrt"' >> /tmp/spc-gnu-docker.env
 

config/env.ini

@@ -55,6 +55,8 @@ SPC_CMD_VAR_FRANKENPHP_XCADDY_MODULES="--with github.com/dunglas/frankenphp/cadd
 ; EXTENSION_DIR=
 
 [windows]
+; build target: win7-static
+SPC_TARGET=msvc-static
 ; php-sdk-binary-tools path
 PHP_SDK_PATH="${WORKING_DIR}\php-sdk-binary-tools"
 ; upx executable path
@@ -63,8 +65,17 @@ UPX_EXEC="${PKG_ROOT_PATH}\bin\upx.exe"
 SPC_MICRO_PATCHES=static_extensions_win32,cli_checks,disable_huge_page,vcruntime140,win32,zend_stream,cli_static
 
 [linux]
-; include PATH for musl libc.
+; Linux can use different build toolchain, but the toolchain can not be changed in this file:
-SPC_LIBC=musl
+; - musl (default): used for general linux distros, can build `musl-static` target only.
+; - zig (WIP): used for general linux distros, can build `musl` and `glibc` targets.
+; - musl-native: used for alpine linux, can build `musl-static` and `musl`(WIP) target.
+; - gnu-native (assume): used for general linux distros, can build `glibc` target only and have portability issues.
+
+; build target:
+; - musl-static (default): pure static linking, using musl-libc, can run on any linux distro.
+; - musl: static linking with dynamic linking to musl-libc, can run on musl-based linux distro.
+; - glibc: static linking with dynamic linking to glibc, can run on glibc-based linux distro.
+SPC_TARGET=musl-static
 ; compiler environments
 CC=${SPC_LINUX_DEFAULT_CC}
 CXX=${SPC_LINUX_DEFAULT_CXX}
@@ -109,6 +120,9 @@ SPC_CMD_VAR_PHP_MAKE_EXTRA_LDFLAGS=""
 SPC_CMD_VAR_PHP_MAKE_EXTRA_LDFLAGS_PROGRAM="-all-static -Wl,-O1 -pie"
 
 [macos]
+; build target: macho or macho (possibly we could support macho-universal in the future)
+; Currently we do not support universal and cross-compilation for macOS.
+SPC_TARGET=macho
 ; compiler environments
 CC=clang
 CXX=clang++

docs/en/guide/extension-notes.md

@@ -82,7 +82,7 @@ and this extension cannot be compiled into php by static linking, so it cannot b
 
 ## xdebug
 
-1. Xdebug is only buildable as a shared extension. On Linux, you need to use static-php-cli with SPC_LIBC=glibc.
+1. Xdebug is only buildable as a shared extension. You need to use a build target other than `musl-static` for SPC_TARGET.
 2. When using Linux/glibc or macOS, you can compile Xdebug as a shared extension using --build-shared="xdebug". 
    The compiled `./php` binary can be configured and run by specifying the INI, eg `./php -d 'zend_extension=/path/to/xdebug.so' your-code.php`.
 

docs/zh/guide/extension-notes.md

@@ -76,7 +76,7 @@ bin/spc build gd --with-libs=freetype,libjpeg,libavif,libwebp --build-cli
 
 ## xdebug
 
-1. Xdebug 只能作为共享扩展进行构建。在 Linux 上，您需要使用 static-php-cli 并设置 SPC_LIBC=glibc。
+1. Xdebug 只能作为共享扩展进行构建。您需要使用除了 `musl-static` 外的其他 `SPC_TARGET` 构建目标。
 2. 使用 Linux/glibc 或 macOS 时，您可以使用 `--build-shared=xdebug` 将 Xdebug 编译为共享扩展。
    编译后的 `./php` 二进制文件可以通过指定 INI 文件进行配置和运行，例如 `./php -d 'zend_extension=/path/to/xdebug.so' your-code.php`。
 

src/SPC/ConsoleApplication.php

@@ -9,6 +9,7 @@ use SPC\command\BuildPHPCommand;
 use SPC\command\CraftCommand;
 use SPC\command\DeleteDownloadCommand;
 use SPC\command\dev\AllExtCommand;
+use SPC\command\dev\EnvCommand;
 use SPC\command\dev\ExtVerCommand;
 use SPC\command\dev\GenerateExtDepDocsCommand;
 use SPC\command\dev\GenerateExtDocCommand;
@@ -70,6 +71,7 @@ final class ConsoleApplication extends Application
                 new GenerateExtDepDocsCommand(),
                 new GenerateLibDepDocsCommand(),
                 new PackLibCommand(),
+                new EnvCommand(),
             ]
         );
     }

src/SPC/builder/extension/imagick.php

@@ -6,6 +6,7 @@ namespace SPC\builder\extension;
 
 use SPC\builder\Extension;
 use SPC\util\CustomExt;
+use SPC\util\SPCTarget;
 
 #[CustomExt('imagick')]
 class imagick extends Extension
@@ -15,7 +16,7 @@ class imagick extends Extension
         if (PHP_OS_FAMILY !== 'Linux') {
             return false;
         }
-        if (getenv('SPC_LIBC') === 'glibc' && str_contains(getenv('CC'), 'devtoolset-10')) {
+        if (SPCTarget::isTarget(SPCTarget::GLIBC)) {
             return false;
         }
         // imagick with calls omp_pause_all, which requires openmp, on non-musl we build imagick without openmp
@@ -26,7 +27,7 @@ class imagick extends Extension
 
     public function getUnixConfigureArg(bool $shared = false): string
     {
-        $disable_omp = !(getenv('SPC_LIBC') === 'glibc' && str_contains(getenv('CC'), 'devtoolset-10')) ? '' : ' ac_cv_func_omp_pause_resource_all=no';
+        $disable_omp = SPCTarget::isTarget(SPCTarget::GLIBC) ? ' ac_cv_func_omp_pause_resource_all=no' : '';
         return '--with-imagick=' . ($shared ? 'shared,' : '') . BUILD_ROOT_PATH . $disable_omp;
     }
 
@@ -34,7 +35,7 @@ class imagick extends Extension
     {
         // on centos 7, it will use the symbol _ZTINSt6thread6_StateE, which is not defined in system libstdc++.so.6
         [$static, $shared] = parent::getStaticAndSharedLibs();
-        if (getenv('SPC_LIBC') === 'glibc' && str_contains(getenv('CC'), 'devtoolset-10')) {
+        if (SPCTarget::isTarget(SPCTarget::GLIBC)) {
             $static .= ' -lstdc++';
             $shared = str_replace('-lstdc++', '', $shared);
         }

src/SPC/builder/linux/LinuxBuilder.php

@@ -25,22 +25,8 @@ class LinuxBuilder extends UnixBuilderBase
     {
         $this->options = $options;
 
-        // check musl-cross make installed if we use musl-cross-make
-        $arch = arch2gnu(php_uname('m'));
-
         GlobalEnvManager::init();
-
+        GlobalEnvManager::afterInit();
-        if (getenv('SPC_LIBC') === 'musl' && !SystemUtil::isMuslDist()) {
-            $this->setOptionIfNotExist('library_path', "LIBRARY_PATH=\"/usr/local/musl/{$arch}-linux-musl/lib\"");
-            $this->setOptionIfNotExist('ld_library_path', "LD_LIBRARY_PATH=\"/usr/local/musl/{$arch}-linux-musl/lib\"");
-            $configure = getenv('SPC_CMD_PREFIX_PHP_CONFIGURE');
-            $configure = "LD_LIBRARY_PATH=\"/usr/local/musl/{$arch}-linux-musl/lib\" " . $configure;
-            GlobalEnvManager::putenv("SPC_CMD_PREFIX_PHP_CONFIGURE={$configure}");
-
-            if (!file_exists("/usr/local/musl/{$arch}-linux-musl/lib/libc.a")) {
-                throw new WrongUsageException('You are building with musl-libc target in glibc distro, but musl-toolchain is not installed, please install musl-toolchain first. (You can use `doctor` command to install it)');
-            }
-        }
 
         // concurrency
         $this->concurrency = intval(getenv('SPC_CONCURRENCY'));

src/SPC/builder/linux/SystemUtil.php

@@ -6,6 +6,7 @@ namespace SPC\builder\linux;
 
 use SPC\builder\traits\UnixSystemUtilTrait;
 use SPC\exception\RuntimeException;
+use SPC\util\SPCTarget;
 
 class SystemUtil
 {
@@ -193,7 +194,7 @@ class SystemUtil
         if (self::$libc_version !== null) {
             return self::$libc_version;
         }
-        if (PHP_OS_FAMILY === 'Linux' && getenv('SPC_LIBC') === 'glibc') {
+        if (SPCTarget::isTarget(SPCTarget::GLIBC)) {
             $result = shell()->execWithResult('ldd --version', false);
             if ($result[0] !== 0) {
                 return null;
@@ -208,7 +209,7 @@ class SystemUtil
             }
             return null;
         }
-        if (PHP_OS_FAMILY === 'Linux' && getenv('SPC_LIBC') === 'musl') {
+        if (SPCTarget::isTarget(SPCTarget::MUSL_STATIC)) {
             if (self::isMuslDist()) {
                 $result = shell()->execWithResult('ldd 2>&1', false);
             } else {

src/SPC/builder/linux/library/icu.php

@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace SPC\builder\linux\library;
 
 use SPC\store\FileSystem;
+use SPC\util\SPCTarget;
 
 class icu extends LinuxLibraryBase
 {
@@ -16,7 +17,7 @@ class icu extends LinuxLibraryBase
     {
         $cppflags = 'CPPFLAGS="-DU_CHARSET_IS_UTF8=1  -DU_USING_ICU_NAMESPACE=1 -DU_STATIC_IMPLEMENTATION=1 -DPIC -fPIC"';
         $cxxflags = 'CXXFLAGS="-std=c++17 -DPIC -fPIC -fno-ident"';
-        $ldflags = getenv('SPC_LIBC') !== 'glibc' ? 'LDFLAGS="-static"' : '';
+        $ldflags = SPCTarget::isTarget(SPCTarget::MUSL_STATIC) ? 'LDFLAGS="-static"' : '';
         shell()->cd($this->source_dir . '/source')->initializeEnv($this)
             ->exec(
                 "{$cppflags} {$cxxflags} {$ldflags} " .

src/SPC/builder/unix/UnixBuilderBase.php

@@ -17,6 +17,7 @@ use SPC\store\Downloader;
 use SPC\store\FileSystem;
 use SPC\util\DependencyUtil;
 use SPC\util\SPCConfigUtil;
+use SPC\util\SPCTarget;
 
 abstract class UnixBuilderBase extends BuilderBase
 {
@@ -200,7 +201,7 @@ abstract class UnixBuilderBase extends BuilderBase
             $util = new SPCConfigUtil($this);
             $config = $util->config($this->ext_list, $this->lib_list, $this->getOption('with-suggested-exts'), $this->getOption('with-suggested-libs'));
             $lens = "{$config['cflags']} {$config['ldflags']} {$config['libs']}";
-            if (PHP_OS_FAMILY === 'Linux' && getenv('SPC_LIBC') === 'musl') {
+            if (SPCTarget::isTarget(SPCTarget::MUSL_STATIC)) {
                 $lens .= ' -static';
             }
             [$ret, $out] = shell()->cd($sample_file_path)->execWithResult(getenv('CC') . ' -o embed embed.c ' . $lens);
@@ -334,7 +335,7 @@ abstract class UnixBuilderBase extends BuilderBase
         $debugFlags = $this->getOption('no-strip') ? "'-w -s' " : '';
         $extLdFlags = "-extldflags '-pie'";
         $muslTags = '';
-        if (PHP_OS_FAMILY === 'Linux' && getenv('SPC_LIBC') === 'musl') {
+        if (SPCTarget::isTarget(SPCTarget::MUSL_STATIC)) {
             $extLdFlags = "-extldflags '-static-pie -Wl,-z,stack-size=0x80000'";
             $muslTags = 'static_build,';
         }

src/SPC/builder/unix/library/imagemagick.php

@@ -4,12 +4,11 @@ declare(strict_types=1);
 
 namespace SPC\builder\unix\library;
 
-use SPC\builder\linux\library\LinuxLibraryBase;
-use SPC\builder\macos\library\MacOSLibraryBase;
 use SPC\exception\FileSystemException;
 use SPC\exception\RuntimeException;
 use SPC\store\FileSystem;
 use SPC\util\executor\UnixAutoconfExecutor;
+use SPC\util\SPCTarget;
 
 trait imagemagick
 {
@@ -33,16 +32,16 @@ trait imagemagick
             ->optionalLib('bzip2', ...ac_with_args('bzlib'))
             ->addConfigureArgs(
                 // TODO: glibc rh 10 toolset's libgomp.a was built without -fPIC so we can't use openmp without depending on libgomp.so
-                getenv('SPC_LIBC') === 'glibc' && str_contains(getenv('CC'), 'devtoolset-10') ? '--disable-openmp' : '--enable-openmp',
+                SPCTarget::isTarget(SPCTarget::GLIBC) ? '--disable-openmp' : '--enable-openmp',
                 '--without-jxl',
                 '--without-x',
             );
 
-        // special: linux musl needs `-static`
+        // special: linux musl-static needs `-static`
-        $ldflags = ($this instanceof LinuxLibraryBase) && getenv('SPC_LIBC') !== 'glibc' ? ('-static -ldl') : '-ldl';
+        $ldflags = !SPCTarget::isTarget(SPCTarget::MUSL_STATIC) ? ('-static -ldl') : '-ldl';
 
         // special: macOS needs -iconv
-        $libs = $this instanceof MacOSLibraryBase ? '-liconv' : '';
+        $libs = SPCTarget::isTarget(SPCTarget::MACHO) ? '-liconv' : '';
 
         $ac->appendEnv([
             'LDFLAGS' => $ldflags,

src/SPC/builder/unix/library/ldap.php

@@ -6,12 +6,13 @@ namespace SPC\builder\unix\library;
 
 use SPC\store\FileSystem;
 use SPC\util\executor\UnixAutoconfExecutor;
+use SPC\util\SPCTarget;
 
 trait ldap
 {
     public function patchBeforeBuild(): bool
     {
-        $extra = getenv('SPC_LIBC') === 'glibc' ? '-ldl -lpthread -lm -lresolv -lutil' : '';
+        $extra = SPCTarget::isTarget(SPCTarget::GLIBC) ? '-ldl -lpthread -lm -lresolv -lutil' : '';
         FileSystem::replaceFileStr($this->source_dir . '/configure', '"-lssl -lcrypto', '"-lssl -lcrypto -lz ' . $extra);
         return true;
     }

src/SPC/builder/unix/library/libxslt.php

@@ -33,7 +33,13 @@ trait libxslt
                 '--without-debugger',
                 "--with-libxml-prefix={$this->getBuildRootPath()}",
             );
-        $ac->exec("{$this->builder->getOption('library_path')} {$this->builder->getOption('ld_library_path')} ./configure {$ac->getConfigureArgsString()}")->make();
+        if (getenv('SPC_LINUX_DEFAULT_LD_LIBRARY_PATH') && getenv('SPC_LINUX_DEFAULT_LIBRARY_PATH')) {
+            $ac->appendEnv([
+                'LD_LIBRARY_PATH' => getenv('SPC_LINUX_DEFAULT_LD_LIBRARY_PATH'),
+                'LIBRARY_PATH' => getenv('SPC_LINUX_DEFAULT_LIBRARY_PATH'),
+            ]);
+        }
+        $ac->configure()->make();
 
         $this->patchPkgconfPrefix(['libexslt.pc']);
         $this->patchLaDependencyPrefix();

src/SPC/builder/unix/library/mimalloc.php

@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace SPC\builder\unix\library;
 
 use SPC\util\executor\UnixCMakeExecutor;
+use SPC\util\SPCTarget;
 
 trait mimalloc
 {
@@ -15,7 +16,7 @@ trait mimalloc
                 '-DMI_BUILD_SHARED=OFF',
                 '-DMI_INSTALL_TOPLEVEL=ON'
             );
-        if (getenv('SPC_LIBC') === 'musl') {
+        if (SPCTarget::isTarget(SPCTarget::MUSL) || SPCTarget::isTarget(SPCTarget::MUSL_STATIC)) {
             $cmake->addConfigureArgs('-DMI_LIBC_MUSL=ON');
         }
         $cmake->build();

src/SPC/builder/unix/library/pkgconfig.php

@@ -4,8 +4,8 @@ declare(strict_types=1);
 
 namespace SPC\builder\unix\library;
 
-use SPC\builder\linux\library\LinuxLibraryBase;
 use SPC\util\executor\UnixAutoconfExecutor;
+use SPC\util\SPCTarget;
 
 trait pkgconfig
 {
@@ -14,7 +14,7 @@ trait pkgconfig
         UnixAutoconfExecutor::create($this)
             ->appendEnv([
                 'CFLAGS' => PHP_OS_FAMILY !== 'Linux' ? '-Wimplicit-function-declaration -Wno-int-conversion' : '',
-                'LDFLAGS' => !($this instanceof LinuxLibraryBase) || getenv('SPC_LIBC') === 'glibc' ? '' : '--static',
+                'LDFLAGS' => SPCTarget::isStaticTarget() ? '--static' : '',
             ])
             ->configure(
                 '--with-internal-glib',

src/SPC/builder/unix/library/postgresql.php

@@ -8,6 +8,7 @@ use SPC\builder\linux\library\LinuxLibraryBase;
 use SPC\exception\FileSystemException;
 use SPC\exception\RuntimeException;
 use SPC\store\FileSystem;
+use SPC\util\SPCTarget;
 
 trait postgresql
 {
@@ -50,7 +51,7 @@ trait postgresql
         $error_exec_cnt += $output[0] === 0 ? 0 : 1;
         if (!empty($output[1][0])) {
             $ldflags = $output[1][0];
-            $envs .= !($this instanceof LinuxLibraryBase) || getenv('SPC_LIBC') === 'glibc' ? " LDFLAGS=\"{$ldflags}\" " : " LDFLAGS=\"{$ldflags} -static\" ";
+            $envs .= SPCTarget::isTarget(SPCTarget::MUSL_STATIC) ? " LDFLAGS=\"{$ldflags} -static\" " : " LDFLAGS=\"{$ldflags}\" ";
         }
         $output = shell()->execWithResult("pkg-config --libs-only-l --static {$packages}");
         $error_exec_cnt += $output[0] === 0 ? 0 : 1;

src/SPC/command/BuildPHPCommand.php

@@ -13,6 +13,7 @@ use SPC\store\SourcePatcher;
 use SPC\util\DependencyUtil;
 use SPC\util\GlobalEnvManager;
 use SPC\util\LicenseDumper;
+use SPC\util\SPCTarget;
 use Symfony\Component\Console\Attribute\AsCommand;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputOption;
@@ -63,7 +64,7 @@ class BuildPHPCommand extends BuildCommand
 
         // check dynamic extension build env
         // linux must build with glibc
-        if (!empty($shared_extensions) && PHP_OS_FAMILY === 'Linux' && getenv('SPC_LIBC') !== 'glibc') {
+        if (!empty($shared_extensions) && SPCTarget::isTarget(SPCTarget::MUSL_STATIC)) {
             $this->output->writeln('Linux does not support dynamic extension loading with musl-libc full-static build, please build with glibc!');
             return static::FAILURE;
         }
@@ -133,6 +134,8 @@ class BuildPHPCommand extends BuildCommand
             // print info
             $indent_texts = [
                 'Build OS' => PHP_OS_FAMILY . ' (' . php_uname('m') . ')',
+                'Build Target' => getenv('SPC_TARGET'),
+                'Build Toolchain' => getenv('SPC_TOOLCHAIN'),
                 'Build SAPI' => $builder->getBuildTypeName($rule),
                 'Static Extensions (' . count($static_extensions) . ')' => implode(',', $static_extensions),
                 'Shared Extensions (' . count($shared_extensions) . ')' => implode(',', $shared_extensions),

src/SPC/command/DownloadCommand.php

@@ -14,6 +14,7 @@ use SPC\store\Config;
 use SPC\store\Downloader;
 use SPC\store\LockFile;
 use SPC\util\DependencyUtil;
+use SPC\util\SPCTarget;
 use Symfony\Component\Console\Attribute\AsCommand;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
@@ -223,7 +224,11 @@ class DownloadCommand extends BaseCommand
                             '{name}' => $source,
                             '{arch}' => arch2gnu(php_uname('m')),
                             '{os}' => strtolower(PHP_OS_FAMILY),
-                            '{libc}' => getenv('SPC_LIBC') ?: 'default',
+                            '{libc}' => match (getenv('SPC_TARGET')) {
+                                SPCTarget::MUSL_STATIC, SPCTarget::MUSL => 'musl',
+                                SPCTarget::GLIBC => 'glibc',
+                                default => 'default',
+                            },
                             '{libcver}' => PHP_OS_FAMILY === 'Linux' ? (SystemUtil::getLibcVersionIfExists() ?? 'default') : 'default',
                         ];
                         $find = str_replace(array_keys($replace), array_values($replace), Config::getPreBuilt('match-pattern'));

src/SPC/command/dev/EnvCommand.php

@@ -0,0 +1,37 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SPC\command\dev;
+
+use SPC\command\BaseCommand;
+use Symfony\Component\Console\Attribute\AsCommand;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+#[AsCommand('dev:env', 'Returns the internally defined environment variables')]
+class EnvCommand extends BaseCommand
+{
+    public function configure()
+    {
+        $this->addArgument('env', InputArgument::REQUIRED, 'The environment variable to show, if not set, all will be shown');
+    }
+
+    public function initialize(InputInterface $input, OutputInterface $output): void
+    {
+        $this->no_motd = true;
+        parent::initialize($input, $output);
+    }
+
+    public function handle(): int
+    {
+        $env = $this->getArgument('env');
+        if (($val = getenv($env)) === false) {
+            $this->output->writeln("<error>Environment variable '{$env}' is not set.</error>");
+            return static::FAILURE;
+        }
+        $this->output->writeln("<info>{$val}</info>");
+        return static::SUCCESS;
+    }
+}

src/SPC/command/dev/PackLibCommand.php

@@ -16,6 +16,7 @@ use SPC\store\Config;
 use SPC\store\FileSystem;
 use SPC\store\LockFile;
 use SPC\util\DependencyUtil;
+use SPC\util\SPCTarget;
 use Symfony\Component\Console\Attribute\AsCommand;
 use Symfony\Component\Console\Input\InputArgument;
 
@@ -76,8 +77,12 @@ class PackLibCommand extends BuildCommand
                         '{name}' => $lib->getName(),
                         '{arch}' => arch2gnu(php_uname('m')),
                         '{os}' => strtolower(PHP_OS_FAMILY),
-                        '{libc}' => getenv('SPC_LIBC') ?: 'default',
+                        '{libc}' => match (getenv('SPC_TARGET')) {
-                        '{libcver}' => PHP_OS_FAMILY === 'Linux' ? (SystemUtil::getLibcVersionIfExists() ?? 'default') : 'default',
+                            SPCTarget::MUSL_STATIC, SPCTarget::MUSL => 'musl',
+                            SPCTarget::GLIBC => 'glibc',
+                            default => 'default',
+                        },
+                        '{libcver}' => SystemUtil::getLibcVersionIfExists() ?? 'default',
                     ];
                     // detect suffix, for proper tar option
                     $tar_option = $this->getTarOptionFromSuffix(Config::getPreBuilt('match-pattern'));

src/SPC/doctor/CheckListHandler.php

@@ -72,6 +72,14 @@ final class CheckListHandler
     {
         foreach (FileSystem::getClassesPsr4(__DIR__ . '/item', 'SPC\doctor\item') as $class) {
             $ref = new \ReflectionClass($class);
+            $optional = $ref->getAttributes(OptionalCheck::class)[0] ?? null;
+            if ($optional !== null) {
+                /** @var OptionalCheck $instance */
+                $instance = $optional->newInstance();
+                if (is_callable($instance->check) && !call_user_func($instance->check)) {
+                    continue; // skip this class if optional check is false
+                }
+            }
             foreach ($ref->getMethods() as $method) {
                 foreach ($method->getAttributes() as $a) {
                     if (is_a($a->getName(), AsCheckItem::class, true)) {

src/SPC/doctor/OptionalCheck.php

@@ -0,0 +1,11 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SPC\doctor;
+
+#[\Attribute(\Attribute::TARGET_CLASS | \Attribute::TARGET_METHOD)]
+class OptionalCheck
+{
+    public function __construct(public array $check) {}
+}

src/SPC/doctor/item/LinuxMuslCheck.php

@@ -4,10 +4,10 @@ declare(strict_types=1);
 
 namespace SPC\doctor\item;
 
-use SPC\builder\linux\SystemUtil;
 use SPC\doctor\AsCheckItem;
 use SPC\doctor\AsFixItem;
 use SPC\doctor\CheckResult;
+use SPC\doctor\OptionalCheck;
 use SPC\exception\DownloaderException;
 use SPC\exception\FileSystemException;
 use SPC\exception\RuntimeException;
@@ -17,19 +17,18 @@ use SPC\store\FileSystem;
 use SPC\store\PackageManager;
 use SPC\store\SourcePatcher;
 
+#[OptionalCheck([self::class, 'optionalCheck'])]
 class LinuxMuslCheck
 {
+    public static function optionalCheck(): bool
+    {
+        return getenv('SPC_TOOLCHAIN') === 'musl';
+    }
+
     /** @noinspection PhpUnused */
     #[AsCheckItem('if musl-wrapper is installed', limit_os: 'Linux', level: 800)]
     public function checkMusl(): CheckResult
     {
-        if (SystemUtil::isMuslDist()) {
-            return CheckResult::ok('musl-based distro, skipped');
-        }
-        if (getenv('SPC_LIBC') === 'glibc') {
-            return CheckResult::ok('Building with glibc, skipped');
-        }
-
         $musl_wrapper_lib = sprintf('/lib/ld-musl-%s.so.1', php_uname('m'));
         if (file_exists($musl_wrapper_lib) && file_exists('/usr/local/musl/lib/libc.a')) {
             return CheckResult::ok();
@@ -40,13 +39,6 @@ class LinuxMuslCheck
     #[AsCheckItem('if musl-cross-make is installed', limit_os: 'Linux', level: 799)]
     public function checkMuslCrossMake(): CheckResult
     {
-        if (SystemUtil::isMuslDist()) {
-            return CheckResult::ok('musl-based distro, skipped');
-        }
-        if (getenv('SPC_LIBC') === 'glibc') {
-            return CheckResult::ok('Building with glibc, skipped');
-        }
-
         $arch = arch2gnu(php_uname('m'));
         $cross_compile_lib = "/usr/local/musl/{$arch}-linux-musl/lib/libc.a";
         $cross_compile_gcc = "/usr/local/musl/bin/{$arch}-linux-musl-gcc";

src/SPC/store/Downloader.php

@@ -11,6 +11,7 @@ use SPC\exception\RuntimeException;
 use SPC\exception\WrongUsageException;
 use SPC\store\pkg\CustomPackage;
 use SPC\store\source\CustomSourceBase;
+use SPC\util\SPCTarget;
 
 /**
  * Source Downloader.
@@ -591,7 +592,16 @@ class Downloader
 
     public static function getPreBuiltLockName(string $source): string
     {
-        return "{$source}-" . PHP_OS_FAMILY . '-' . getenv('GNU_ARCH') . '-' . (getenv('SPC_LIBC') ?: 'default') . '-' . (SystemUtil::getLibcVersionIfExists() ?? 'default');
+        $os_family = PHP_OS_FAMILY;
+        $gnu_arch = getenv('GNU_ARCH') ?: 'unknown';
+        $libc = match (getenv('SPC_TARGET')) {
+            SPCTarget::MUSL_STATIC, SPCTarget::MUSL => 'musl',
+            SPCTarget::GLIBC => 'glibc',
+            default => 'default',
+        };
+        $libc_version = SystemUtil::getLibcVersionIfExists() ?? 'default';
+
+        return "{$source}-{$os_family}-{$gnu_arch}-{$libc}-{$libc_version}";
     }
 
     /**

src/SPC/util/GlobalEnvManager.php

@@ -40,24 +40,6 @@ class GlobalEnvManager
             self::putenv('PKG_CONFIG_PATH=' . BUILD_ROOT_PATH . '/lib/pkgconfig');
         }
 
-        // Define env vars for linux
-        if (PHP_OS_FAMILY === 'Linux') {
-            $arch = getenv('GNU_ARCH');
-            if (SystemUtil::isMuslDist() || getenv('SPC_LIBC') === 'glibc') {
-                self::putenv('SPC_LINUX_DEFAULT_CC=gcc');
-                self::putenv('SPC_LINUX_DEFAULT_CXX=g++');
-                self::putenv('SPC_LINUX_DEFAULT_AR=ar');
-                self::putenv('SPC_LINUX_DEFAULT_LD=ld.gold');
-            } else {
-                self::putenv("SPC_LINUX_DEFAULT_CC={$arch}-linux-musl-gcc");
-                self::putenv("SPC_LINUX_DEFAULT_CXX={$arch}-linux-musl-g++");
-                self::putenv("SPC_LINUX_DEFAULT_AR={$arch}-linux-musl-ar");
-                self::putenv("SPC_LINUX_DEFAULT_LD={$arch}-linux-musl-ld");
-                self::addPathIfNotExists('/usr/local/musl/bin');
-                self::addPathIfNotExists("/usr/local/musl/{$arch}-linux-musl/bin");
-            }
-        }
-
         $ini = self::readIniFile();
 
         $default_put_list = [];
@@ -80,6 +62,29 @@ class GlobalEnvManager
                 self::putenv("{$k}={$v}");
             }
         }
+
+        // deprecated: convert SPC_LIBC to SPC_TARGET
+        if (getenv('SPC_LIBC') !== false) {
+            logger()->warning('SPC_LIBC is deprecated, please use SPC_TARGET instead.');
+            $target = match (getenv('SPC_LIBC')) {
+                'musl' => SPCTarget::MUSL_STATIC,
+                default => SPCTarget::GLIBC,
+            };
+            self::putenv("SPC_TARGET={$target}");
+            self::putenv('SPC_LIBC');
+        }
+
+        // auto-select toolchain based on target and OS temporarily
+        // TODO: use 'zig' instead of 'gcc-native' when ZigToolchain is implemented
+        $toolchain = match (getenv('SPC_TARGET')) {
+            SPCTarget::MUSL_STATIC, SPCTarget::MUSL => SystemUtil::isMuslDist() ? 'gcc-native' : 'musl',
+            SPCTarget::MACHO => 'clang-native',
+            SPCTarget::MSVC_STATIC => 'msvc',
+            default => 'gcc-native',
+        };
+
+        SPCTarget::initTargetForToolchain($toolchain);
+
         // apply second time
         $ini2 = self::readIniFile();
 
@@ -108,13 +113,18 @@ class GlobalEnvManager
         self::$env_cache[] = $val;
     }
 
-    private static function addPathIfNotExists(string $path): void
+    public static function addPathIfNotExists(string $path): void
     {
         if (is_unix() && !str_contains(getenv('PATH'), $path)) {
             self::putenv("PATH={$path}:" . getenv('PATH'));
         }
     }
 
+    public static function afterInit(): void
+    {
+        SPCTarget::afterInitTargetForToolchain();
+    }
+
     /**
      * @throws WrongUsageException
      */

src/SPC/util/SPCConfigUtil.php

@@ -55,7 +55,7 @@ class SPCConfigUtil
         ob_get_clean();
         $ldflags = $this->getLdflagsString();
         $libs = $this->getLibsString($libraries, $with_dependencies);
-        if (PHP_OS_FAMILY === 'Darwin') {
+        if (SPCTarget::isTarget(SPCTarget::MACHO)) {
             $libs .= " {$this->getFrameworksString($extensions)}";
         }
         $cflags = $this->getIncludesString();
@@ -146,7 +146,7 @@ class SPCConfigUtil
             }
         }
         // patch: imagick (imagemagick wrapper) for linux needs libgomp
-        if (in_array('imagemagick', $libraries) && PHP_OS_FAMILY === 'Linux' && !(getenv('SPC_LIBC') === 'glibc' && str_contains(getenv('CC'), 'devtoolset-10'))) {
+        if (in_array('imagemagick', $libraries) && !SPCTarget::isTarget(SPCTarget::GLIBC)) {
             $short_name[] = '-lgomp';
         }
         return implode(' ', $short_name);

src/SPC/util/SPCTarget.php

@@ -0,0 +1,83 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SPC\util;
+
+use SPC\exception\WrongUsageException;
+use SPC\util\toolchain\ClangNativeToolchain;
+use SPC\util\toolchain\GccNativeToolchain;
+use SPC\util\toolchain\MSVCToolchain;
+use SPC\util\toolchain\MuslToolchain;
+use SPC\util\toolchain\ToolchainInterface;
+use SPC\util\toolchain\ZigToolchain;
+
+/**
+ * SPC build target constants and toolchain initialization.
+ * format: {target_name}[-{libc_subtype}]
+ */
+class SPCTarget
+{
+    public const MUSL = 'musl';
+
+    public const MUSL_STATIC = 'musl-static';
+
+    public const GLIBC = 'glibc';
+
+    public const MACHO = 'macho';
+
+    public const MSVC_STATIC = 'msvc-static';
+
+    public const TOOLCHAIN_LIST = [
+        'musl' => MuslToolchain::class,
+        'gcc-native' => GccNativeToolchain::class,
+        'clang-native' => ClangNativeToolchain::class,
+        'msvc' => MSVCToolchain::class,
+        'zig' => ZigToolchain::class,
+    ];
+
+    public static function isTarget(string $target): bool
+    {
+        $env = getenv('SPC_TARGET');
+        if ($env === false) {
+            return false;
+        }
+        $env = strtolower($env);
+        return $env === $target;
+    }
+
+    public static function isStaticTarget(): bool
+    {
+        $env = getenv('SPC_TARGET');
+        if ($env === false) {
+            return false;
+        }
+        $env = strtolower($env);
+        return str_ends_with($env, '-static') || $env === self::MUSL_STATIC;
+    }
+
+    public static function initTargetForToolchain(string $toolchain): void
+    {
+        $target = getenv('SPC_TARGET');
+        $toolchain = strtolower($toolchain);
+        if (isset(self::TOOLCHAIN_LIST[$toolchain])) {
+            $toolchainClass = self::TOOLCHAIN_LIST[$toolchain];
+            /* @var ToolchainInterface $toolchainClass */
+            (new $toolchainClass())->initEnv($target);
+        }
+        GlobalEnvManager::putenv("SPC_TOOLCHAIN={$toolchain}");
+    }
+
+    public static function afterInitTargetForToolchain()
+    {
+        if (!getenv('SPC_TOOLCHAIN')) {
+            throw new WrongUsageException('SPC_TOOLCHAIN not set');
+        }
+        $toolchain = getenv('SPC_TOOLCHAIN');
+        if (!isset(self::TOOLCHAIN_LIST[$toolchain])) {
+            throw new WrongUsageException("Unknown toolchain: {$toolchain}");
+        }
+        $toolchainClass = self::TOOLCHAIN_LIST[$toolchain];
+        (new $toolchainClass())->afterInit(getenv('SPC_TARGET'));
+    }
+}

src/SPC/util/toolchain/ClangNativeToolchain.php

@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SPC\util\toolchain;
+
+use SPC\builder\freebsd\SystemUtil as FreeBSDSystemUtil;
+use SPC\builder\linux\SystemUtil as LinuxSystemUtil;
+use SPC\builder\macos\SystemUtil as MacOSSystemUtil;
+use SPC\exception\WrongUsageException;
+use SPC\util\GlobalEnvManager;
+
+class ClangNativeToolchain implements ToolchainInterface
+{
+    public function initEnv(string $target): void
+    {
+        GlobalEnvManager::putenv('SPC_LINUX_DEFAULT_CC=clang');
+        GlobalEnvManager::putenv('SPC_LINUX_DEFAULT_CXX=clang++');
+        GlobalEnvManager::putenv('SPC_LINUX_DEFAULT_AR=ar');
+        GlobalEnvManager::putenv('SPC_LINUX_DEFAULT_LD=ld');
+    }
+
+    public function afterInit(string $target): void
+    {
+        // check clang exists
+        match (PHP_OS_FAMILY) {
+            'Linux' => LinuxSystemUtil::findCommand('clang++') ?? throw new WrongUsageException('Clang++ not found, please install it or manually set CC/CXX to a valid path.'),
+            'Darwin' => MacOSSystemUtil::findCommand('clang++') ?? throw new WrongUsageException('Clang++ not found, please install it or set CC/CXX to a valid path.'),
+            'BSD' => FreeBSDSystemUtil::findCommand('clang++') ?? throw new WrongUsageException('Clang++ not found, please install it or set CC/CXX to a valid path.'),
+            default => throw new WrongUsageException('Clang is not supported on ' . PHP_OS_FAMILY . '.'),
+        };
+    }
+}

src/SPC/util/toolchain/GccNativeToolchain.php

@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SPC\util\toolchain;
+
+use SPC\builder\freebsd\SystemUtil as FreeBSDSystemUtil;
+use SPC\builder\linux\SystemUtil as LinuxSystemUtil;
+use SPC\builder\macos\SystemUtil as MacOSSystemUtil;
+use SPC\util\GlobalEnvManager;
+
+class GccNativeToolchain implements ToolchainInterface
+{
+    public function initEnv(string $target): void
+    {
+        GlobalEnvManager::putenv('SPC_LINUX_DEFAULT_CC=gcc');
+        GlobalEnvManager::putenv('SPC_LINUX_DEFAULT_CXX=g++');
+        GlobalEnvManager::putenv('SPC_LINUX_DEFAULT_AR=ar');
+        GlobalEnvManager::putenv('SPC_LINUX_DEFAULT_LD=ld.gold');
+    }
+
+    public function afterInit(string $target): void
+    {
+        // check gcc exists
+        match (PHP_OS_FAMILY) {
+            'Linux' => LinuxSystemUtil::findCommand('g++') ?? throw new \RuntimeException('g++ not found, please install it or set CC/CXX to a valid path.'),
+            'Darwin' => MacOSSystemUtil::findCommand('g++') ?? throw new \RuntimeException('g++ not found, please install it or set CC/CXX to a valid path.'),
+            'BSD' => FreeBSDSystemUtil::findCommand('g++') ?? throw new \RuntimeException('g++ not found, please install it or set CC/CXX to a valid path.'),
+            default => throw new \RuntimeException('GCC is not supported on ' . PHP_OS_FAMILY . '.'),
+        };
+    }
+}

src/SPC/util/toolchain/MSVCToolchain.php

@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SPC\util\toolchain;
+
+class MSVCToolchain implements ToolchainInterface
+{
+    public function initEnv(string $target): void {}
+
+    public function afterInit(string $target): void {}
+}

src/SPC/util/toolchain/MuslToolchain.php

@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SPC\util\toolchain;
+
+use SPC\exception\WrongUsageException;
+use SPC\util\GlobalEnvManager;
+use SPC\util\SPCTarget;
+
+class MuslToolchain implements ToolchainInterface
+{
+    public function initEnv(string $target): void
+    {
+        // Check if the target is musl-static (the musl(-shared) target is not supported yet)
+        if (!in_array($target, [SPCTarget::MUSL_STATIC/* , SPCTarget::MUSL */], true)) {
+            throw new WrongUsageException('MuslToolchain can only be used with the "musl-static" target.');
+        }
+        $arch = getenv('GNU_ARCH');
+        // Set environment variables for musl toolchain
+        GlobalEnvManager::putenv("SPC_LINUX_DEFAULT_CC={$arch}-linux-musl-gcc");
+        GlobalEnvManager::putenv("SPC_LINUX_DEFAULT_CXX={$arch}-linux-musl-g++");
+        GlobalEnvManager::putenv("SPC_LINUX_DEFAULT_AR={$arch}-linux-musl-ar");
+        GlobalEnvManager::putenv("SPC_LINUX_DEFAULT_LD={$arch}-linux-musl-ld");
+        GlobalEnvManager::addPathIfNotExists('/usr/local/musl/bin');
+        GlobalEnvManager::addPathIfNotExists("/usr/local/musl/{$arch}-linux-musl/bin");
+
+        GlobalEnvManager::putenv("SPC_LINUX_DEFAULT_LD_LIBRARY_PATH=/usr/local/musl/lib:/usr/local/musl/{$arch}-linux-musl/lib");
+        GlobalEnvManager::putenv("SPC_LINUX_DEFAULT_LIBRARY_PATH=/usr/local/musl/lib:/usr/local/musl/{$arch}-linux-musl/lib");
+    }
+
+    public function afterInit(string $target): void
+    {
+        $arch = getenv('GNU_ARCH');
+        // append LD_LIBRARY_PATH to $configure = getenv('SPC_CMD_PREFIX_PHP_CONFIGURE');
+        $configure = getenv('SPC_CMD_PREFIX_PHP_CONFIGURE');
+        $ld_library_path = getenv('SPC_LINUX_DEFAULT_LD_LIBRARY_PATH');
+        GlobalEnvManager::putenv("SPC_CMD_PREFIX_PHP_CONFIGURE=LD_LIBRARY_PATH=\"{$ld_library_path}\" {$configure}");
+
+        if (!file_exists("/usr/local/musl/{$arch}-linux-musl/lib/libc.a")) {
+            throw new WrongUsageException('You are building with musl-libc target in glibc distro, but musl-toolchain is not installed, please install musl-toolchain first. (You can use `doctor` command to install it)');
+        }
+    }
+}

src/SPC/util/toolchain/ToolchainInterface.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SPC\util\toolchain;
+
+interface ToolchainInterface
+{
+    /**
+     * Initialize the environment for the given target.
+     */
+    public function initEnv(string $target): void;
+
+    /**
+     * Perform actions after the environment has been initialized for the given target.
+     */
+    public function afterInit(string $target): void;
+}

src/SPC/util/toolchain/ZigToolchain.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SPC\util\toolchain;
+
+class ZigToolchain implements ToolchainInterface
+{
+    public function initEnv(string $target): void
+    {
+        // TODO: Implement zig
+    }
+
+    public function afterInit(string $target): void
+    {
+        // TODO: Implement afterInit() method.
+    }
+}