try to make core build reproducible

jni/Android.mk

@@ -1,5 +1,3 @@
-LOCAL_LDFLAGS += -Wl,--build-id=none
-
 JNI_DIR := $(call my-dir)
 LOCAL_PATH := $(call my-dir)
 
@@ -33,5 +31,6 @@ LOCAL_CFLAGS 	+= -Drestrict='' -D__EMX__ -DFIXED_POINT -DUSE_ALLOCA -DHAVE_LRINT
 LOCAL_CFLAGS 	+= -DANDROID_NDK -DDISABLE_IMPORTGL -fno-strict-aliasing -DAVOID_TABLES -DANDROID_TILE_BASED_DECODE -DANDROID_ARMV6_IDCT -ffast-math -D__STDC_CONSTANT_MACROS
 
 LOCAL_SRC_FILES := dc_wrapper.c
+LOCAL_LDFLAGS += -Wl,--build-id=none
 
 include $(BUILD_SHARED_LIBRARY)

scripts/ndk-make.sh

@@ -65,10 +65,11 @@ if test -z "$NDK_HOST_TAG"; then
     NDK_HOST_TAG="$KERNEL-$ARCH"
 fi
 
-unset RUSTFLAGS
-
+# make core build reproducible
 ROOT_DIR="$(realpath $(dirname $(dirname "$0")))"
 export RUSTFLAGS="-C link-args=-Wl,--build-id=none --remap-path-prefix=$HOME/.cargo= --remap-path-prefix=$ROOT_DIR="
+export SOURCE_DATE_EPOCH=1
+export CFLAGS="$CFLAGS -ffile-prefix-map=$ROOT_DIR="
 
 TOOLCHAIN="$ANDROID_NDK_ROOT/toolchains/llvm/prebuilt/$NDK_HOST_TAG"
 export CARGO_TARGET_ARMV7_LINUX_ANDROIDEABI_LINKER="$TOOLCHAIN/bin/armv7a-linux-androideabi16-clang"