Fix compile with musl

adb/Makefile

@@ -70,7 +70,7 @@ LOCAL_STATIC_LIBRARIES := libcutils libc
 ################################
 
 OBJS = $(LOCAL_SRC_FILES:.cpp=.o) $(LOCAL_SRC_C_FILES:.c=.o)
-CXXFLAGS = $(OPT_CXXFLAGS) -std=c++14 $(LOCAL_CFLAGS) $(LOCAL_INCLUDES)
+CXXFLAGS = $(OPT_CXXFLAGS) -std=gnu++14 $(LOCAL_CFLAGS) $(LOCAL_INCLUDES)
 CFLAGS= $(OPT_CFLAGS) $(LOCAL_CFLAGS) $(LOCAL_INCLUDES)
 
 %.o: %.cpp

adb/diagnose_usb.cpp

@@ -29,6 +29,10 @@
 
 static const char kPermissionsHelpUrl[] = "http://developer.android.com/tools/device.html";
 
+__attribute__((weak)) int group_member(gid_t gid) {
+	return 0;
+}
+
 // Returns a message describing any potential problems we find with udev, or nullptr if we can't
 // find plugdev information (i.e. udev is not installed).
 static const char* GetUdevProblem() {

base/file.cpp

@@ -29,6 +29,12 @@
 #define LOG_TAG "base.file"
 #include "cutils/log.h"
 #include "utils/Compat.h"
+#include <sys/stat.h>
+
+/* speciaally for musl c */
+#ifndef DEFFILEMODE
+# define DEFFILEMODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)/* 0666*/
+#endif
 
 namespace android {
 namespace base {

base/logging.cpp

@@ -93,11 +93,11 @@ namespace {
 using std::mutex;
 using std::lock_guard;
 
-#if defined(__GLIBC__)
-const char* getprogname() {
+//#if defined(__GLIBC__)
+const char* __attribute__((weak)) getprogname() {
   return program_invocation_short_name;
 }
-#endif
+//#endif
 
 #else
 const char* getprogname() {

include/cutils/android_reboot.h

@@ -19,6 +19,14 @@
 
 #include <mntent.h>
 
+#if defined(__cplusplus)
+       #define __BEGIN_DECLS extern "C" {
+       #define __END_DECLS }
+       #else
+       #define __BEGIN_DECLS
+       #define __END_DECLS
+#endif
+
 __BEGIN_DECLS
 
 /* Commands */