add option to allow linking musl dynamically on alpine

Author: henderkes

config/env.ini

@@ -75,8 +75,10 @@ SPC_MICRO_PATCHES=static_extensions_win32,cli_checks,disable_huge_page,vcruntime
 ; - musl-native: used for alpine linux, can build `musl` and `musl -dynamic` target.
 ; - gnu-native: used for general linux distros, can build gnu target for the installed glibc version only.
 
-; LEGACY option to specify the target
+; option to specify the target, superceded by SPC_TARGET if set
 SPC_LIBC=musl
+; uncomment to link libc dynamically on musl
+; SPC_MUSL_DYNAMIC=true
 
 ; Recommended: specify your target here. Zig toolchain will be used.
 ; examples:

src/SPC/util/SPCTarget.php

@@ -27,10 +27,10 @@ public static function isStatic(): bool
             return true;
         }
         if (ToolchainManager::getToolchainClass() === GccNativeToolchain::class) {
-            return PHP_OS_FAMILY === 'Linux' && SystemUtil::isMuslDist();
+            return PHP_OS_FAMILY === 'Linux' && SystemUtil::isMuslDist() && !getenv('SPC_MUSL_DYNAMIC');
         }
         if (ToolchainManager::getToolchainClass() === ClangNativeToolchain::class) {
-            return PHP_OS_FAMILY === 'Linux' && SystemUtil::isMuslDist();
+            return PHP_OS_FAMILY === 'Linux' && SystemUtil::isMuslDist() && !getenv('SPC_MUSL_DYNAMIC');
         }
         // if SPC_LIBC is set, it means the target is static, remove it when 3.0 is released
         if ($target = getenv('SPC_TARGET')) {