toolchain fixes forward port from v2-pgo

config/env.ini

@@ -100,6 +100,7 @@ SPC_TARGET=${GNU_ARCH}-linux-musl
 CC=${SPC_DEFAULT_CC}
 CXX=${SPC_DEFAULT_CXX}
 AR=${SPC_DEFAULT_AR}
+RANLIB=${SPC_DEFAULT_RANLIB}
 LD=${SPC_DEFAULT_LD}
 ; default compiler flags, used in CMake toolchain file, openssl and pkg-config build
 SPC_DEFAULT_CFLAGS="-fPIC -O3 -pipe -fno-plt -fno-semantic-interposition -fstack-clash-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffunction-sections -fdata-sections"
@@ -125,6 +126,8 @@ SPC_CMD_VAR_PHP_MAKE_EXTRA_CFLAGS="-g -fstack-protector-strong -fno-ident -fPIE
 SPC_CMD_VAR_PHP_MAKE_EXTRA_CXXFLAGS="-g -fstack-protector-strong -fno-ident -fPIE -fvisibility=hidden -fvisibility-inlines-hidden ${SPC_DEFAULT_CXXFLAGS}"
 ; EXTRA_LDFLAGS for `make` php, can use -release to set a soname for libphp.so
 SPC_CMD_VAR_PHP_MAKE_EXTRA_LDFLAGS=""
+; EXTRA_LDFLAGS_PROGRAM for `make` php; appended only to SAPI executable links (cli/fpm/cgi/micro/embed). Used by PGO to inject -fprofile-use= without polluting libphp.{a,so}.
+SPC_CMD_VAR_PHP_MAKE_EXTRA_LDFLAGS_PROGRAM=""
 
 ; optional, path to openssl conf. This affects where openssl will look for the default CA.
 ; default on Debian/Alpine: /etc/ssl, default on RHEL: /etc/pki/tls
@@ -140,6 +143,7 @@ SPC_USE_LLVM=system
 CC=${SPC_DEFAULT_CC}
 CXX=${SPC_DEFAULT_CXX}
 AR=${SPC_DEFAULT_AR}
+RANLIB=${SPC_DEFAULT_RANLIB}
 LD=${SPC_DEFAULT_LD}
 ; default compiler flags, used in CMake toolchain file, openssl and pkg-config build
 SPC_DEFAULT_CFLAGS="--target=${MAC_ARCH}-apple-darwin -O3 -fno-plt -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffunction-sections -fdata-sections"
@@ -163,5 +167,7 @@ SPC_CMD_VAR_PHP_MAKE_EXTRA_CFLAGS="-g -fstack-protector-strong -fpic -fpie -fvis
 SPC_CMD_VAR_PHP_MAKE_EXTRA_CXXFLAGS="-g -fstack-protector-strong -fno-ident -fpie -fvisibility=hidden -fvisibility-inlines-hidden -Werror=unknown-warning-option ${SPC_DEFAULT_CXXFLAGS}"
 ; EXTRA_LDFLAGS for `make` php, can use -release to set a soname for libphp.dylib
 SPC_CMD_VAR_PHP_MAKE_EXTRA_LDFLAGS=""
+; EXTRA_LDFLAGS_PROGRAM for `make` php; appended only to SAPI executable links (cli/fpm/cgi/micro/embed). Used by PGO to inject -fprofile-use= without polluting libphp.{a,dylib}.
+SPC_CMD_VAR_PHP_MAKE_EXTRA_LDFLAGS_PROGRAM=""
 ; minimum compatible macOS version (LLVM vars, availability not guaranteed)
 MACOSX_DEPLOYMENT_TARGET=12.0

src/Package/Artifact/go_xcaddy.php

@@ -109,7 +109,7 @@ class go_xcaddy
             'GOROOT' => "{$target_path}",
             'GOBIN' => "{$target_path}/bin",
             'GOPATH' => "{$target_path}/go",
-        ])->exec('CC=cc go install github.com/caddyserver/xcaddy/cmd/xcaddy@latest');
+        ])->exec('CGO_ENABLED=0 go install github.com/caddyserver/xcaddy/cmd/xcaddy@latest');
         GlobalEnvManager::addPathIfNotExists("{$target_path}/bin");
     }
 }

src/Package/Artifact/zig.php

@@ -12,6 +12,7 @@ use StaticPHP\Attribute\Artifact\CustomBinary;
 use StaticPHP\Attribute\Artifact\CustomBinaryCheckUpdate;
 use StaticPHP\Exception\DownloaderException;
 use StaticPHP\Runtime\SystemTarget;
+use StaticPHP\Util\FileSystem;
 
 class zig
 {
@@ -131,5 +132,151 @@ class zig
         chmod("{$target_path}/zig-ld.lld", 0755);
         chmod("{$target_path}/zig-ranlib", 0755);
         chmod("{$target_path}/zig-objcopy", 0755);
+
+        // Build the clang runtime bits zig 0.15+ doesn't ship: profile runtime
+        // (so -fprofile-generate actually emits .profraw) and crtbegin/crtend
+        // (so shared libs get __dso_handle and the __cxa_finalize atexit hook).
+        // These get auto-linked by the zig-cc wrapper when the right flags fly past.
+        $this->buildClangRuntimeBits($target_path);
+    }
+
+    /**
+     * Detect the bundled clang version and build the missing clang runtime
+     * archives into `<zig>/lib/`. Compiles from a 2 MB compiler-rt-<llvm>.src
+     * tarball — far cheaper than fetching the 2 GB prebuilt LLVM tarball.
+     */
+    private function buildClangRuntimeBits(string $zig_bin_dir): void
+    {
+        if (PHP_OS_FAMILY !== 'Linux') {
+            return;
+        }
+        $libDir = "{$zig_bin_dir}/lib";
+        $profileLib = "{$libDir}/libclang_rt.profile.a";
+        $crtBegin = "{$libDir}/clang_rt.crtbegin.o";
+        $crtEnd = "{$libDir}/clang_rt.crtend.o";
+        if (file_exists($profileLib) && file_exists($crtBegin) && file_exists($crtEnd)) {
+            return;
+        }
+
+        $zig = "{$zig_bin_dir}/zig";
+        $verLine = trim((string) shell_exec(escapeshellarg($zig) . ' cc --version 2>/dev/null'));
+        if (!preg_match('/clang version (\d+\.\d+\.\d+)/', $verLine, $m)) {
+            logger()->warning('[zig] could not detect bundled clang version; skipping runtime bit build (PGO + shared libs without __dso_handle will fail to link)');
+            return;
+        }
+        $llvmVersion = $m[1];
+        logger()->info("Building clang runtime bits for LLVM {$llvmVersion} (zig's bundled clang)");
+
+        $srcRoot = $this->fetchCompilerRtSource($llvmVersion);
+        if ($srcRoot === null) {
+            return;
+        }
+
+        f_mkdir($libDir, recursive: true);
+        if (!file_exists($profileLib)) {
+            $this->buildProfileRuntime($zig, $srcRoot, $profileLib);
+        }
+        if (!file_exists($crtBegin) || !file_exists($crtEnd)) {
+            $this->buildCrtObjects($zig, $srcRoot, $crtBegin, $crtEnd);
+        }
+        FileSystem::removeDir($srcRoot);
+    }
+
+    private function fetchCompilerRtSource(string $llvmVersion): ?string
+    {
+        $tarball = "compiler-rt-{$llvmVersion}.src.tar.xz";
+        $url = "https://github.com/llvm/llvm-project/releases/download/llvmorg-{$llvmVersion}/{$tarball}";
+        $tarballPath = DOWNLOAD_PATH . '/' . $tarball;
+        if (!file_exists($tarballPath)) {
+            try {
+                default_shell()->executeCurlDownload($url, $tarballPath);
+            } catch (\Throwable $e) {
+                logger()->warning("[zig] failed to download {$tarball}: {$e->getMessage()}");
+                return null;
+            }
+        }
+        $srcRoot = PKG_ROOT_PATH . "/compiler-rt-src-{$llvmVersion}";
+        FileSystem::removeDir($srcRoot);
+        FileSystem::createDir($srcRoot);
+        try {
+            default_shell()->executeTarExtract($tarballPath, $srcRoot, 'xz');
+        } catch (\Throwable $e) {
+            logger()->warning("[zig] failed to extract {$tarball}: {$e->getMessage()}");
+            return null;
+        }
+        return $srcRoot;
+    }
+
+    private function buildProfileRuntime(string $zig, string $srcRoot, string $libPath): void
+    {
+        $profileSrc = "{$srcRoot}/lib/profile";
+        $profileInc = "{$srcRoot}/include";
+        if (!is_dir($profileSrc)) {
+            logger()->warning("[zig] profile src dir missing at {$profileSrc} — PGO will not work");
+            return;
+        }
+        $sources = array_merge(
+            glob("{$profileSrc}/*.c") ?: [],
+            glob("{$profileSrc}/*.cpp") ?: []
+        );
+        // Keep Linux-only compilation units; the others bring in OS-specific headers
+        // we can't satisfy without their respective SDKs.
+        $skip = ['/PlatformAIX', '/PlatformDarwin', '/PlatformFuchsia', '/PlatformOther', '/PlatformWindows', '/WindowsMMap'];
+        $sources = array_filter($sources, function ($f) use ($skip) {
+            foreach ($skip as $s) {
+                if (str_contains($f, $s)) {
+                    return false;
+                }
+            }
+            return true;
+        });
+
+        $objDir = "{$srcRoot}/obj-profile";
+        f_mkdir($objDir, recursive: true);
+        $cflags = '-c -O2 -fPIC -fvisibility=hidden ' .
+            '-I' . escapeshellarg($profileInc) . ' ' .
+            '-DCOMPILER_RT_HAS_ATOMICS=1 -DCOMPILER_RT_HAS_FCNTL_LCK=1 -DCOMPILER_RT_HAS_UNAME=1';
+        $objs = [];
+        foreach ($sources as $src) {
+            $obj = $objDir . '/' . pathinfo($src, PATHINFO_FILENAME) . '.o';
+            $cmd = escapeshellarg($zig) . ' cc ' . $cflags . ' -o ' . escapeshellarg($obj) . ' ' . escapeshellarg($src) . ' 2>&1';
+            if (!$this->runZigCmd($cmd, $obj, "failed to compile {$src}")) {
+                return;
+            }
+            $objs[] = $obj;
+        }
+        $arCmd = escapeshellarg($zig) . ' ar rcs ' . escapeshellarg($libPath) . ' ' . implode(' ', array_map('escapeshellarg', $objs)) . ' 2>&1';
+        if (!$this->runZigCmd($arCmd, $libPath, 'zig ar failed')) {
+            return;
+        }
+        logger()->info('[zig] libclang_rt.profile.a installed (' . filesize($libPath) . ' bytes)');
+    }
+
+    private function buildCrtObjects(string $zig, string $srcRoot, string $crtBegin, string $crtEnd): void
+    {
+        $beginSrc = "{$srcRoot}/lib/builtins/crtbegin.c";
+        $endSrc = "{$srcRoot}/lib/builtins/crtend.c";
+        if (!is_file($beginSrc) || !is_file($endSrc)) {
+            logger()->error("[zig] crtbegin/crtend source missing under {$srcRoot}/lib/builtins — shared libs will lack __dso_handle");
+            return;
+        }
+        $cflags = '-c -O2 -fPIC -fvisibility=hidden -DCRT_HAS_INITFINI_ARRAY';
+        foreach ([[$beginSrc, $crtBegin], [$endSrc, $crtEnd]] as [$src, $dst]) {
+            $cmd = escapeshellarg($zig) . ' cc ' . $cflags . ' -o ' . escapeshellarg($dst) . ' ' . escapeshellarg($src) . ' 2>&1';
+            if (!$this->runZigCmd($cmd, $dst, "failed to compile {$src}")) {
+                return;
+            }
+        }
+        logger()->info('[zig] clang_rt.crtbegin.o + clang_rt.crtend.o installed (' . filesize($crtBegin) . ' + ' . filesize($crtEnd) . ' bytes)');
+    }
+
+    private function runZigCmd(string $cmd, string $dst, string $errPrefix): bool
+    {
+        exec($cmd, $out, $rc);
+        if ($rc !== 0 || !is_file($dst)) {
+            logger()->warning("[zig] {$errPrefix}: " . implode("\n", $out));
+            return false;
+        }
+        return true;
     }
 }

src/StaticPHP/Doctor/Item/LinuxMuslCheck.php

@@ -73,13 +73,20 @@ class LinuxMuslCheck
             $prefix = 'sudo ';
             logger()->warning('Current user is not root, using sudo for running command');
         }
+        $sysEnv = ['CC' => 'gcc', 'CXX' => 'g++', 'AR' => 'ar', 'LD' => 'ld', 'RANLIB' => 'ranlib'];
+        $envFlags = '';
+        foreach ($sysEnv as $k => $v) {
+            $envFlags .= "{$k}={$v} ";
+        }
+        $envFlags = rtrim($envFlags);
         $shell = shell()->cd(SOURCE_PATH . '/musl-wrapper')
-            ->exec('CC=gcc CXX=g++ AR=ar LD=ld ./configure --disable-gcc-wrapper')
-            ->exec('CC=gcc CXX=g++ AR=ar LD=ld make -j');
+            ->setEnv($sysEnv)
+            ->exec('./configure --disable-gcc-wrapper')
+            ->exec('make -j');
         if ($prefix !== '') {
-            f_passthru('cd ' . SOURCE_PATH . "/musl-wrapper && CC=gcc CXX=g++ AR=ar LD=ld {$prefix}make install");
+            f_passthru('cd ' . SOURCE_PATH . "/musl-wrapper && {$envFlags} {$prefix}make install");
         } else {
-            $shell->exec("CC=gcc CXX=g++ AR=ar LD=ld {$prefix}make install");
+            $shell->exec("{$prefix}make install");
         }
         return true;
     }

src/StaticPHP/Package/PhpExtensionPackage.php

@@ -274,14 +274,20 @@ class PhpExtensionPackage extends Package
             $compiler_extra = trim($compiler_extra . ' -lcompiler_rt');
             GlobalEnvManager::putenv("SPC_COMPILER_EXTRA={$compiler_extra}");
         }
-        $config = (new SPCConfigUtil())->getExtensionConfig($this);
+        // include_suggests so transitive optional libs (e.g. librdkafka → lz4/zstd/ssl) are in the link line
+        $config = (new SPCConfigUtil())->getExtensionConfig($this, include_suggests: true);
         [$staticLibs, $sharedLibs] = $this->splitLibsIntoStaticAndShared($config['libs']);
         $preStatic = PHP_OS_FAMILY === 'Darwin' ? '' : '-Wl,--start-group ';
         $postStatic = PHP_OS_FAMILY === 'Darwin' ? '' : ' -Wl,--end-group ';
+        // -Wl,-Bsymbolic: bind zend_* refs to the .so's own copies, not via global lookup
+        $ldflags = (string) $config['ldflags'];
+        if (PHP_OS_FAMILY !== 'Darwin' && !str_contains($ldflags, '-Wl,-Bsymbolic')) {
+            $ldflags = clean_spaces($ldflags . ' -Wl,-Bsymbolic');
+        }
         return [
             'CFLAGS' => $config['cflags'],
             'CXXFLAGS' => $config['cflags'],
-            'LDFLAGS' => $config['ldflags'],
+            'LDFLAGS' => $ldflags,
             'LIBS' => clean_spaces("{$preStatic} {$staticLibs} {$postStatic} {$sharedLibs}"),
             'LD_LIBRARY_PATH' => BUILD_LIB_PATH,
         ];
@@ -303,10 +309,11 @@ class PhpExtensionPackage extends Package
     public function configureForUnix(array $env, PhpExtensionPackage $package): void
     {
         $phpvars = getenv('SPC_EXTRA_PHP_VARS') ?: '';
+        // CustomPhpConfigureArg keys are OS names ('Linux'/'Darwin'), not platform strings
         shell()->cd($package->getSourceDir())
             ->setEnv($env)
             ->exec(
-                './configure ' . $this->getPhpConfigureArg(SystemTarget::getCurrentPlatformString(), true) .
+                './configure ' . $this->getPhpConfigureArg(SystemTarget::getTargetOS(), true) .
                 ' --with-php-config=' . BUILD_BIN_PATH . '/php-config ' .
                 "--enable-shared --disable-static {$phpvars}"
             );
@@ -318,6 +325,8 @@ class PhpExtensionPackage extends Package
     #[Stage]
     public function makeForUnix(array $env, PhpExtensionPackage $package, PackageBuilder $builder): void
     {
+        // phpize Makefile's _SHARED_LIBADD line misses our static archives — splice them in
+        $package->patchSharedLibAdd();
         shell()->cd($package->getSourceDir())
             ->setEnv($env)
             ->exec('make clean')
@@ -325,6 +334,34 @@ class PhpExtensionPackage extends Package
             ->exec('make install');
     }
 
+    public function patchSharedLibAdd(): void
+    {
+        // include_suggests so transitive optional libs (e.g. librdkafka → lz4/zstd/ssl) are in the link line
+        $config = (new SPCConfigUtil())->getExtensionConfig($this, include_suggests: true);
+        [$staticLibs, $sharedLibs] = $this->splitLibsIntoStaticAndShared($config['libs']);
+        $lstdcpp = str_contains($sharedLibs, '-l:libstdc++.a')
+            ? '-l:libstdc++.a'
+            : (str_contains($sharedLibs, '-lstdc++') ? '-lstdc++' : '');
+
+        $makefile = $this->getSourceDir() . '/Makefile';
+        if (!is_file($makefile)) {
+            return;
+        }
+        $content = (string) file_get_contents($makefile);
+        if (!preg_match('/^(.*_SHARED_LIBADD\s*=\s*)(.*)$/m', $content, $m)) {
+            return;
+        }
+        $prefix = $m[1];
+        $current = trim($m[2]);
+        $merged = clean_spaces("{$current} {$staticLibs} {$lstdcpp}");
+        $merged = deduplicate_flags($merged);
+        \StaticPHP\Util\FileSystem::replaceFileRegex(
+            $makefile,
+            '/^(.*_SHARED_LIBADD\s*=.*)$/m',
+            $prefix . $merged
+        );
+    }
+
     /**
      * Build shared extension on Unix-like systems.
      * Only for internal calling. For external use, call buildShared() instead.
@@ -333,6 +370,21 @@ class PhpExtensionPackage extends Package
      */
     public function buildSharedForUnix(PackageBuilder $builder): void
     {
+        // skip virtual addons (arg-type=none + display-name → owning ext); the parent ext built it
+        $argType = $this->extension_config['arg-type'] ?? null;
+        $displayName = $this->extension_config['display-name'] ?? null;
+        if ($argType === 'none' && $displayName !== null && $displayName !== $this->getExtensionName()) {
+            logger()->info("Skipping virtual extension [{$this->getName()}] — it's part of [{$displayName}].");
+            return;
+        }
+
+        if (!is_dir($this->getSourceDir())) {
+            throw new ValidationException(
+                "Extension source directory not found: {$this->getSourceDir()}",
+                validation_module: "Extension {$this->getName()} source"
+            );
+        }
+
         $env = $this->getSharedExtensionEnv();
 
         $this->runStage([$this, 'phpizeForUnix'], ['env' => $env]);

src/StaticPHP/Runtime/Executor/UnixCMakeExecutor.php

@@ -230,7 +230,7 @@ class UnixCMakeExecutor extends Executor
 
         // EXE linker flags: base system libs + framework flags for target packages
         $exeLinkerFlags = SystemTarget::getRuntimeLibs();
-        if ($this->package instanceof TargetPackage) {
+        if ($this->package instanceof TargetPackage && SystemTarget::getTargetOS() === 'Darwin') {
             $resolvedNames = array_keys($this->installer->getResolvedPackages());
             $resolvedNames[] = $this->package->getName();
             $fwFlags = new SPCConfigUtil()->getFrameworksString($resolvedNames);
@@ -302,9 +302,12 @@ set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
 set(CMAKE_C_STANDARD_INCLUDE_DIRECTORIES "{$include}")
 set(CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES "{$include}")
 CMAKE;
-        // Whoops, linux may need CMAKE_AR sometimes
+        // pin AR/RANLIB so cmake uses zig-ar/zig-ranlib instead of system /usr/bin/ranlib (zig archives need it)
         if (PHP_OS_FAMILY === 'Linux') {
-            $toolchain .= "\nSET(CMAKE_AR \"ar\")";
+            $ar = getenv('SPC_DEFAULT_AR') ?: getenv('AR') ?: 'ar';
+            $ranlib = getenv('SPC_DEFAULT_RANLIB') ?: (getenv('RANLIB') ?: 'ranlib');
+            $toolchain .= "\nSET(CMAKE_AR \"{$ar}\")";
+            $toolchain .= "\nSET(CMAKE_RANLIB \"{$ranlib}\")";
         }
         FileSystem::writeFile(SOURCE_PATH . '/toolchain.cmake', $toolchain);
         return $created = realpath(SOURCE_PATH . '/toolchain.cmake');

src/StaticPHP/Toolchain/ClangBrewToolchain.php

@@ -15,6 +15,7 @@ class ClangBrewToolchain extends ClangNativeToolchain
         GlobalEnvManager::putenv("SPC_DEFAULT_CC={$homebrew_prefix}/opt/llvm/bin/clang");
         GlobalEnvManager::putenv("SPC_DEFAULT_CXX={$homebrew_prefix}/opt/llvm/bin/clang++");
         GlobalEnvManager::putenv("SPC_DEFAULT_AR={$homebrew_prefix}/opt/llvm/bin/llvm-ar");
+        GlobalEnvManager::putenv("SPC_DEFAULT_RANLIB={$homebrew_prefix}/opt/llvm/bin/llvm-ranlib");
         GlobalEnvManager::putenv('SPC_DEFAULT_LD=ld');
         GlobalEnvManager::addPathIfNotExists("{$homebrew_prefix}/opt/llvm/bin");
     }

src/StaticPHP/Toolchain/ClangNativeToolchain.php

@@ -21,6 +21,7 @@ class ClangNativeToolchain implements UnixToolchainInterface
         GlobalEnvManager::putenv('SPC_DEFAULT_CC=clang');
         GlobalEnvManager::putenv('SPC_DEFAULT_CXX=clang++');
         GlobalEnvManager::putenv('SPC_DEFAULT_AR=ar');
+        GlobalEnvManager::putenv('SPC_DEFAULT_RANLIB=ranlib');
         GlobalEnvManager::putenv('SPC_DEFAULT_LD=ld');
     }
 

src/StaticPHP/Toolchain/GccNativeToolchain.php

@@ -18,6 +18,7 @@ class GccNativeToolchain implements UnixToolchainInterface
         GlobalEnvManager::putenv('SPC_DEFAULT_CC=gcc');
         GlobalEnvManager::putenv('SPC_DEFAULT_CXX=g++');
         GlobalEnvManager::putenv('SPC_DEFAULT_AR=ar');
+        GlobalEnvManager::putenv('SPC_DEFAULT_RANLIB=ranlib');
         GlobalEnvManager::putenv('SPC_DEFAULT_LD=ld');
     }
 

src/StaticPHP/Toolchain/ZigToolchain.php

@@ -16,28 +16,8 @@ class ZigToolchain implements UnixToolchainInterface
         GlobalEnvManager::putenv('SPC_DEFAULT_CC=zig-cc');
         GlobalEnvManager::putenv('SPC_DEFAULT_CXX=zig-c++');
         GlobalEnvManager::putenv('SPC_DEFAULT_AR=zig-ar');
+        GlobalEnvManager::putenv('SPC_DEFAULT_RANLIB=zig-ranlib');
         GlobalEnvManager::putenv('SPC_DEFAULT_LD=zig-ld.lld');
-
-        // Generate additional objects needed for zig toolchain
-        $paths = ['/usr/lib/gcc', '/usr/local/lib/gcc'];
-        $objects = ['crtbeginS.o', 'crtendS.o'];
-        $found = [];
-
-        foreach ($objects as $obj) {
-            $located = null;
-            foreach ($paths as $base) {
-                $output = shell_exec("find {$base} -name {$obj} 2>/dev/null | grep -v '/32/' | head -n 1");
-                $line = trim((string) $output);
-                if ($line !== '') {
-                    $located = $line;
-                    break;
-                }
-            }
-            if ($located) {
-                $found[] = $located;
-            }
-        }
-        GlobalEnvManager::putenv('SPC_EXTRA_RUNTIME_OBJECTS=' . implode(' ', $found));
     }
 
     public function afterInit(): void

src/globals/scripts/zig-cc.sh

@@ -1,9 +1,14 @@
 #!/usr/bin/env bash
 
 SCRIPT_DIR="$(dirname "${BASH_SOURCE[0]}")"
-BUILDROOT_ABS="${BUILD_ROOT_PATH:-$(realpath "$SCRIPT_DIR/../../../buildroot/include" 2>/dev/null || true)}"
+BUILDROOT_INC="${BUILD_INCLUDE_PATH:-$SCRIPT_DIR/../../../buildroot/include}"
+BUILDROOT_ABS="$(realpath "$BUILDROOT_INC" 2>/dev/null || true)"
 PARSED_ARGS=()
 
+is_buildroot_inc() {
+    [[ -n "$BUILDROOT_ABS" && "$1" == "$BUILDROOT_ABS" ]]
+}
+
 while [[ $# -gt 0 ]]; do
     case "$1" in
         -isystem)
@@ -11,13 +16,13 @@ while [[ $# -gt 0 ]]; do
             ARG="$1"
             shift
             ARG_ABS="$(realpath "$ARG" 2>/dev/null || true)"
-            [[ "$ARG_ABS" == "$BUILDROOT_ABS" ]] && PARSED_ARGS+=("-I$ARG") || PARSED_ARGS+=("-isystem" "$ARG")
+            is_buildroot_inc "$ARG_ABS" && PARSED_ARGS+=("-I$ARG") || PARSED_ARGS+=("-isystem" "$ARG")
             ;;
         -isystem*)
             ARG="${1#-isystem}"
             shift
             ARG_ABS="$(realpath "$ARG" 2>/dev/null || true)"
-            [[ "$ARG_ABS" == "$BUILDROOT_ABS" ]] && PARSED_ARGS+=("-I$ARG") || PARSED_ARGS+=("-isystem$ARG")
+            is_buildroot_inc "$ARG_ABS" && PARSED_ARGS+=("-I$ARG") || PARSED_ARGS+=("-isystem$ARG")
             ;;
         -march=*|-mcpu=*)
             OPT_NAME="${1%%=*}"
@@ -32,6 +37,10 @@ while [[ $# -gt 0 ]]; do
             PARSED_ARGS+=("${OPT_NAME}=${OPT_VALUE}")
             shift
             ;;
+        -Wlogical-op|-Wduplicated-cond|-Wduplicated-branches|-Wno-clobbered|-Wjump-misses-init|-Wformat-truncation|-Warray-bounds=*|-Wimplicit-fallthrough=*)
+            # GCC-only warning flags that clang/zig doesn't recognize; drop to silence -Wunknown-warning-option noise
+            shift
+            ;;
         *)
             PARSED_ARGS+=("$1")
             shift
@@ -39,6 +48,24 @@ while [[ $# -gt 0 ]]; do
     esac
 done
 
+IS_LINK=1
+NEED_PROFILE_RT=0 # https://codeberg.org/ziglang/zig/issues/32066
+NEED_CRT=0 # https://codeberg.org/ziglang/zig/issues/32064
+for _a in "${PARSED_ARGS[@]}"; do
+    case "$_a" in
+        -c|-S|-E|-M|-MM) IS_LINK=0 ;;
+        -fprofile-generate*|-fprofile-instr-generate*|-fcs-profile-generate*) NEED_PROFILE_RT=1 ;;
+        -shared) NEED_CRT=1 ;;
+    esac
+done
+[[ "$SPC_COMPILER_EXTRA" == *-fprofile-generate* || "$SPC_COMPILER_EXTRA" == *-fcs-profile-generate* ]] && NEED_PROFILE_RT=1
+if [[ $IS_LINK -eq 1 && $NEED_PROFILE_RT -eq 1 && -f "$SCRIPT_DIR/lib/libclang_rt.profile.a" ]]; then
+    PARSED_ARGS+=("$SCRIPT_DIR/lib/libclang_rt.profile.a" "-Wl,-u,__llvm_profile_runtime")
+fi
+if [[ $IS_LINK -eq 1 && $NEED_CRT -eq 1 && -f "$SCRIPT_DIR/lib/clang_rt.crtbegin.o" && -f "$SCRIPT_DIR/lib/clang_rt.crtend.o" ]]; then
+    PARSED_ARGS+=("$SCRIPT_DIR/lib/clang_rt.crtbegin.o" "$SCRIPT_DIR/lib/clang_rt.crtend.o")
+fi
+
 [[ -n "$SPC_TARGET" ]] && TARGET="-target $SPC_TARGET" || TARGET=""
 
 if [[ "$SPC_TARGET" =~ \.[0-9]+\.[0-9]+ ]]; then