fix: use C++ 17 compiler for ICU (#414)

* fix: use C++ 17 compiler for ICU

* wip

* hack CXX env var to force C++17

* test intl

* test intl

* add retry for CI test download

* patch

* separate intl with newer icu c++ patch

---------

Co-authored-by: crazywhalecc <jesse2061@outlook.com>

src/SPC/builder/extension/intl.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SPC\builder\extension;
+
+use SPC\builder\Extension;
+use SPC\store\FileSystem;
+use SPC\util\CustomExt;
+
+#[CustomExt('intl')]
+class intl extends Extension
+{
+    public function patchBeforeBuildconf(): bool
+    {
+        // TODO: remove the following line when https://github.com/php/php-src/pull/14002 will be released
+        FileSystem::replaceFileStr(SOURCE_PATH . '/php-src/ext/intl/config.m4', 'PHP_CXX_COMPILE_STDCXX(11', 'PHP_CXX_COMPILE_STDCXX(17');
+        // Also need to use clang++ -std=c++17 to force override the default C++ standard
+        if (is_string($env = getenv('CXX')) && !str_contains($env, 'std=c++17')) {
+            f_putenv('CXX=' . $env . ' -std=c++17');
+        } else {
+            f_putenv('CXX=clang++ -std=c++17');
+        }
+        return true;
+    }
+}

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

@@ -11,7 +11,7 @@ class icu extends LinuxLibraryBase
     protected function build(): void
     {
         $cppflags = 'CPPFLAGS="-DU_CHARSET_IS_UTF8=1  -DU_USING_ICU_NAMESPACE=1  -DU_STATIC_IMPLEMENTATION=1"';
-        $cxxflags = 'CXXFLAGS="-std=c++11"';
+        $cxxflags = 'CXXFLAGS="-std=c++17"';
         $ldflags = 'LDFLAGS="-static"';
         shell()->cd($this->source_dir . '/source')
             ->exec(