support for dynamic linking of musl libc

Author: henderkes

config/env.ini

@@ -65,6 +65,8 @@ SPC_MICRO_PATCHES=static_extensions_win32,cli_checks,disable_huge_page,vcruntime
 [linux]
 ; include PATH for musl libc.
 SPC_LIBC=musl
+SPC_LIBC_VERSION=
+SPC_LIBC_LINKAGE=-static
 ; compiler environments
 CC=${SPC_LINUX_DEFAULT_CC}
 CXX=${SPC_LINUX_DEFAULT_CXX}

src/SPC/builder/linux/LinuxBuilder.php

@@ -139,7 +139,7 @@ public function buildPHP(int $build_target = BUILD_TARGET_NONE): void
         }
 
         $embed_type = getenv('SPC_CMD_VAR_PHP_EMBED_TYPE') ?: 'static';
-        if ($embed_type !== 'static' && getenv('SPC_LIBC') === 'musl') {
+        if ($embed_type !== 'static' && getenv('SPC_LIBC') === 'musl' && getenv('SPC_LIBC_LINKAGE') === '-static') {
             throw new WrongUsageException('Musl libc does not support dynamic linking of PHP embed!');
         }
         shell()->cd(SOURCE_PATH . '/php-src')

src/SPC/builder/unix/UnixBuilderBase.php

@@ -202,9 +202,7 @@ protected function sanityCheck(int $build_target): void
             $util = new SPCConfigUtil($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') {
-                $lens .= ' -static';
-            }
+            $lens .= ' ' . getenv('SPC_LIBC_LINKAGE');
             // if someone changed to EMBED_TYPE=shared, we need to add LD_LIBRARY_PATH
             if (getenv('SPC_CMD_VAR_PHP_EMBED_TYPE') === 'shared') {
                 $ext_path = 'LD_LIBRARY_PATH=' . BUILD_LIB_PATH . ':$LD_LIBRARY_PATH ';

src/SPC/command/BuildPHPCommand.php

@@ -63,7 +63,7 @@ public function handle(): int
 
         // 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) && PHP_OS_FAMILY === 'Linux' && getenv('SPC_LIBC') !== 'glibc' && getenv('SPC_LIBC_LINKAGE') === '-static') {
             $this->output->writeln('Linux does not support dynamic extension loading with musl-libc full-static build, please build with glibc!');
             return static::FAILURE;
         }