Make it possible to build libhardware.

third_party/hwcplus/src/hardware.c

Index: third_party/hwcplus/src/hardware.c
diff --git a/third_party/hwcplus/src/hardware.c b/third_party/hwcplus/src/hardware.c
index 6713ea0107efa7f0aa0b84dfd7881535cc0b4572..4ff293d243cefae991b156e93c9925d396d82f91 100644
--- a/third_party/hwcplus/src/hardware.c
+++ b/third_party/hwcplus/src/hardware.c
@@ -23,17 +23,29 @@
 #include <pthread.h>
 #include <errno.h>
 #include <limits.h>
+#include <stdlib.h>
 
 #define LOG_TAG "HAL"
+#ifdef ANDROID
 #include <utils/Log.h>
+#else
+#include <stdio.h>
+#include <unistd.h>
+#include <log/log.h>
+#endif
 
-/** Base path of the hal modules */
 #if defined(__LP64__)
-#define HAL_LIBRARY_PATH1 "/system/lib64/hw"
-#define HAL_LIBRARY_PATH2 "/vendor/lib64/hw"
+#define _64 "64"
 #else
-#define HAL_LIBRARY_PATH1 "/system/lib/hw"
-#define HAL_LIBRARY_PATH2 "/vendor/lib/hw"
+#define _64 ""
+#endif
+
+/** Base path of the hal modules */
+#ifndef HAL_LIBRARY_PATH1
+#define HAL_LIBRARY_PATH1 "/system/lib" _64 "/hw"
+#endif
+#ifndef HAL_LIBRARY_PATH2
+#define HAL_LIBRARY_PATH2 "/vendor/lib" _64 "/hw"
 #endif
 
 /**
@@ -129,6 +141,14 @@ static int load(const char *id,
 static int hw_module_exists(char *path, size_t path_len, const char *name,
                             const char *subname)
 {
+    char *hal_library_path = getenv("HAL_LIBRARY_PATH");
+    if (hal_library_path) {
+        snprintf(path, path_len, "%s/%s.%s.so",
+                 hal_library_path, name, subname);
+        if (access(path, R_OK) == 0)
+            return 0;
+    }
+
     snprintf(path, path_len, "%s/%s.%s.so",
              HAL_LIBRARY_PATH2, name, subname);
     if (access(path, R_OK) == 0)