Make it easy to build without crt0

build.py

@@ -421,6 +421,7 @@ def build_binary(args):
 
     if "magiskinit" in args.target:
         flag += " B_INIT=1"
+        flag += " B_CRT0=1"
 
     if flag:
         dump_bin_header(args)

native/src/Android.mk

@@ -59,13 +59,9 @@ endif
 
 ifdef B_INIT
 
-# -lc -lm is hardcoded in this variable, disable it
-TARGET_LDLIBS :=
-
 include $(CLEAR_VARS)
 LOCAL_MODULE := magiskinit
 LOCAL_STATIC_LIBRARIES := \
-    crt0 \
     libbase \
     libpolicy \
     libxz \
@@ -80,6 +76,14 @@ LOCAL_SRC_FILES := \
     init/selinux.cpp \
     init/init-rs.cpp
 
+LOCAL_LDFLAGS := -static
+
+ifdef B_CRT0
+# -lc -lm is hardcoded in this variable, disable it
+TARGET_LDLIBS :=
+LOCAL_STATIC_LIBRARIES += crt0
+endif
+
 include $(BUILD_EXECUTABLE)
 
 endif

native/src/Application.mk

@@ -8,14 +8,13 @@ APP_PLATFORM     := android-26
 APP_THIN_ARCHIVE := true
 APP_STRIP_MODE   := none
 
-# magiskinit uses crt0
-ifdef B_INIT
+ifdef B_CRT0
 
 # Disable all security and debugging features
 APP_CFLAGS       +=	-fno-unwind-tables -fno-asynchronous-unwind-tables -fno-stack-protector -U_FORTIFY_SOURCE
 APP_LDFLAGS		 += -Wl,-wrap,abort_message
 # Override output folder to make sure all dependencies are rebuilt with new CFLAGS
-NDK_APP_OUT      := ./obj/init
+NDK_APP_OUT      := ./obj/nolibc
 
 endif