Support getting/setting API level in static binaries.

Bug: http://b/27917272
Test: fixes static semaphore.sem_wait_no_EINTR_in_sdk_less_equal_than_23 test
Change-Id: Ifeeff20772ff0308aab9417d48671b604a3e9665

3 files changed, 22 insertions, 20 deletions

diff --git a/libc/bionic/libc_init_static.cpp b/libc/bionic/libc_init_static.cpp
index 93a63b543..d19dd2882 100644
--- a/libc/bionic/libc_init_static.cpp
+++ b/libc/bionic/libc_init_static.cpp
@@ -113,6 +113,16 @@ __noreturn void __libc_init(void* raw_args,
   exit(slingshot(args.argc, args.argv, args.envp));
 }
 
+static uint32_t g_target_sdk_version{__ANDROID_API__};
+
+extern "C" uint32_t android_get_application_target_sdk_version() {
+  return g_target_sdk_version;
+}
+
 uint32_t bionic_get_application_target_sdk_version() {
-  return __ANDROID_API__;
+  return android_get_application_target_sdk_version();
+}
+
+extern "C" void android_set_application_target_sdk_version(uint32_t target) {
+  g_target_sdk_version = target;
 }
diff --git a/libdl/Android.bp b/libdl/Android.bp
index 082cdead1..d5fae0eff 100644
--- a/libdl/Android.bp
+++ b/libdl/Android.bp
@@ -74,7 +74,7 @@ cc_library {
         whole_static_libs: ["libdl_static"],
     },
     static: {
-        srcs: ["libdl_static.c"],
+        srcs: ["libdl_static.cpp"],
     },
     cflags: [
         "-Wall",
diff --git a/libdl/libdl_static.c b/libdl/libdl_static.cpp
index 0dbd73fbd..714676258 100644
--- a/libdl/libdl_static.c
+++ b/libdl/libdl_static.cpp
@@ -17,41 +17,33 @@
 #include <dlfcn.h>
 #include <link.h>
 #include <stdlib.h>
-#include <stdbool.h>
 
-// Proxy calls to bionic loader
-void* dlopen(const char* filename __unused, int flag __unused) {
-  return NULL;
+void* dlopen(const char* /*filename*/, int /*flag*/) {
+  return nullptr;
 }
 
 char* dlerror() {
-  return NULL;
+  return nullptr;
 }
 
-void* dlsym(void* handle __unused, const char* symbol __unused) {
-  return NULL;
+void* dlsym(void* /*handle*/, const char* /*symbol*/) {
+  return nullptr;
 }
 
-void* dlvsym(void* handle __unused,
-             const char* symbol __unused,
-             const char* version __unused) {
-  return NULL;
+void* dlvsym(void* /*handle*/, const char* /*symbol*/, const char* /*version*/) {
+  return nullptr;
 }
 
-int dladdr(const void* addr __unused, Dl_info* info __unused) {
+int dladdr(const void* /*addr*/, Dl_info* /*info*/) {
   return 0;
 }
 
-int dlclose(void* handle __unused) {
+int dlclose(void* /*handle*/) {
   return -1;
 }
 
 #if defined(__arm__)
-_Unwind_Ptr dl_unwind_find_exidx(_Unwind_Ptr pc __unused, int* pcount __unused) {
+_Unwind_Ptr dl_unwind_find_exidx(_Unwind_Ptr /*pc*/, int* /*pcount*/) {
   return 0;
 }
 #endif
-
-void android_set_application_target_sdk_version(uint32_t target __unused) {
-}
-