WIP: use system libraries for grpc without building our own grpc lib

Author: henderkes

src/SPC/builder/LibraryBase.php

@@ -375,8 +375,17 @@ protected function isLibraryInstalled(): bool
                 return false;
             }
         }
+        $pkg_config_path = getenv('PKG_CONFIG_PATH') ?: '';
+        $search_paths = array_filter(explode(is_unix() ? ':' : ';', $pkg_config_path));
         foreach (Config::getLib(static::NAME, 'pkg-configs', []) as $name) {
-            if (!file_exists(BUILD_LIB_PATH . "/pkgconfig/{$name}.pc")) {
+            $found = false;
+            foreach ($search_paths as $path) {
+                if (file_exists($path . "/{$name}.pc")) {
+                    $found = true;
+                    break;
+                }
+            }
+            if (!$found) {
                 return false;
             }
         }

src/SPC/builder/traits/UnixLibraryTrait.php

@@ -34,7 +34,7 @@ public function patchPkgconfPrefix(array $files = [], int $patch_option = PKGCON
             $files = array_map(fn ($x) => "{$x}.pc", $conf_pc);
         }
         foreach ($files as $name) {
-            $realpath = realpath(BUILD_ROOT_PATH . '/lib/pkgconfig/' . $name);
+            $realpath = realpath(BUILD_LIB_PATH . '/pkgconfig/' . $name);
             if ($realpath === false) {
                 throw new PatchException('pkg-config prefix patcher', 'Cannot find library [' . static::NAME . '] pkgconfig file [' . $name . '] in ' . BUILD_LIB_PATH . '/pkgconfig/ !');
             }

src/SPC/util/SPCConfigUtil.php

@@ -226,9 +226,17 @@ private function getIncludesString(array $libraries): string
         // parse pkg-configs
         foreach ($libraries as $library) {
             $pc = Config::getLib($library, 'pkg-configs', []);
+            $pkg_config_path = getenv('PKG_CONFIG_PATH') ?: '';
+            $search_paths = array_filter(explode(is_unix() ? ':' : ';', $pkg_config_path));
             foreach ($pc as $file) {
-                if (!file_exists(BUILD_LIB_PATH . "/pkgconfig/{$file}.pc")) {
-                    throw new WrongUsageException("pkg-config file '{$file}.pc' for lib [{$library}] does not exist in '" . BUILD_LIB_PATH . "/pkgconfig'. Please build it first.");
+                $found = false;
+                foreach ($search_paths as $path) {
+                    if (file_exists($path . "/{$file}.pc")) {
+                        $found = true;
+                    }
+                }
+                if (!$found) {
+                    throw new WrongUsageException("pkg-config file '{$file}.pc' for lib [{$library}] does not exist. Please build it first.");
                 }
             }
             $pc_cflags = implode(' ', $pc);
@@ -257,9 +265,17 @@ private function getLibsString(array $libraries, bool $use_short_libs = true): s
         foreach ($libraries as $library) {
             // add pkg-configs libs
             $pkg_configs = Config::getLib($library, 'pkg-configs', []);
-            foreach ($pkg_configs as $pkg_config) {
-                if (!file_exists(BUILD_LIB_PATH . "/pkgconfig/{$pkg_config}.pc")) {
-                    throw new WrongUsageException("pkg-config file '{$pkg_config}.pc' for lib [{$library}] does not exist in '" . BUILD_LIB_PATH . "/pkgconfig'. Please build it first.");
+            $pkg_config_path = getenv('PKG_CONFIG_PATH') ?: '';
+            $search_paths = array_filter(explode(is_unix() ? ':' : ';', $pkg_config_path));
+            foreach ($pkg_configs as $file) {
+                $found = false;
+                foreach ($search_paths as $path) {
+                    if (file_exists($path . "/{$file}.pc")) {
+                        $found = true;
+                    }
+                }
+                if (!$found) {
+                    throw new WrongUsageException("pkg-config file '{$file}.pc' for lib [{$library}] does not exist. Please build it first.");
                 }
             }
             $pkg_configs = implode(' ', $pkg_configs);