Add real pkg-config integration

src/SPC/util/PkgConfigUtil.php

@@ -0,0 +1,69 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SPC\util;
+
+use SPC\exception\RuntimeException;
+
+class PkgConfigUtil
+{
+    /**
+     * Returns --cflags-only-other output.
+     * The reason we return the string is we cannot use array_unique() on cflags,
+     * some cflags may contains spaces.
+     *
+     * @param  string           $pkg_config_str .pc file str, accepts multiple files
+     * @return string           cflags string, e.g. "-Wno-implicit-int-float-conversion ..."
+     * @throws RuntimeException
+     */
+    public static function getCflags(string $pkg_config_str): string
+    {
+        // get other things
+        $result = self::execWithResult("pkg-config --static --cflags-only-other {$pkg_config_str}");
+        return trim($result);
+    }
+
+    /**
+     * Returns --libs-only-l and --libs-only-other output.
+     * The reason we return the array is to avoid duplicate lib defines.
+     *
+     * @param  string           $pkg_config_str .pc file str, accepts multiple files
+     * @return array            Unique libs array, e.g. [-lz, -lxml, ...]
+     * @throws RuntimeException
+     */
+    public static function getLibsArray(string $pkg_config_str): array
+    {
+        // Use this instead of shell() to avoid unnecessary outputs
+        $result = self::execWithResult("pkg-config --static --libs-only-l {$pkg_config_str}");
+        $libs = explode(' ', trim($result));
+
+        // get other things
+        $result = self::execWithResult("pkg-config --libs --libs-only-other {$pkg_config_str}");
+        // convert libxxx.a to -L{path} -lxxx
+        $exp = explode(' ', trim($result));
+        foreach ($exp as $item) {
+            // if item ends with .a, convert it to -lxxx
+            if (str_ends_with($item, '.a') && str_starts_with($item, 'lib')) {
+                $name = pathinfo($item, PATHINFO_BASENAME);
+                $name = substr($name, 3, -2); // remove 'lib' prefix and '.a' suffix
+                $libs[] = "-l{$name}";
+            } else {
+                // if item starts with -L, keep it as is
+                // if item starts with -l, keep it as is
+                $libs[] = $item;
+            }
+        }
+
+        return array_unique($libs);
+    }
+
+    private static function execWithResult(string $cmd): string
+    {
+        f_exec($cmd, $output, $result_code);
+        if ($result_code !== 0) {
+            throw new RuntimeException("pkg-config command failed with code {$result_code}: {$cmd}");
+        }
+        return implode("\n", $output);
+    }
+}