Using LLVM pass in Android Studio does not work - android-studio

Question

I tried to compile the Telegram Android program locally, and I want to use LLVMPass in the NDK.
mypass.cpp
#include "llvm/Pass.h"
#include "llvm/IR/Function.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/Transforms/IPO/PassManagerBuilder.h"
using namespace llvm;
namespace {
struct SkeletonPass : public FunctionPass {
static char ID;
SkeletonPass() : FunctionPass(ID) {}
virtual bool runOnFunction(Function &F) {
errs() << "I saw a function called " << F.getName() << "!\n";
return false;
}
};
}
char SkeletonPass::ID = 0;
static void registerSkeletonPass(const PassManagerBuilder &,
legacy::PassManagerBase &PM) {
PM.add(new SkeletonPass());
}
static RegisterStandardPasses
RegisterMyPass(PassManagerBuilder::EP_EarlyAsPossible,
registerSkeletonPass);
I used it successfully on simple HelloWorld.
HelloWorld.cpp
#include<iostream>
using namespace std;
void test_IRVMP(){
printf("HelloWorld!\n");
return;
}
int main(){
test_IRVMP();
return 0;
}
This is my output using Pass via clang:
$ clang++ -Xclang -load -Xclang ~/Download/llvm-8.0.0-build/lib/LLVMmypass.so ./HelloWorld.cpp -o HelloWorld -g  ✔
I saw a function called __cxx_global_var_init!
I saw a function called _Z10test_IRVMPv!
I saw a function called main!
I saw a function called _GLOBAL__sub_I_HelloWorld.cpp!
But if I use the Pass in Android Studio, I get the following warning:
……
C/C++: /home/mzflrx/AndroidStudioProjects/Telegram/TMessagesProj/jni/tgnet/Datacenter.cpp:199:62: warning: '&&' within '||' [-Wlogical-op-parentheses]
C/C++: /home/mzflrx/AndroidStudioProjects/Telegram/TMessagesProj/jni/tgnet/Datacenter.cpp:199:62: note: place parentheses around the '&&' expression to silence this warning
C/C++: /home/mzflrx/AndroidStudioProjects/Telegram/TMessagesProj/jni/tgnet/Datacenter.cpp:257:62: warning: '&&' within '||' [-Wlogical-op-parentheses]
C/C++: /home/mzflrx/AndroidStudioProjects/Telegram/TMessagesProj/jni/tgnet/Datacenter.cpp:257:62: note: place parentheses around the '&&' expression to silence this warning
C/C++: /home/mzflrx/AndroidStudioProjects/Telegram/TMessagesProj/jni/tgnet/Datacenter.cpp:377:62: warning: '&&' within '||' [-Wlogical-op-parentheses]
C/C++: /home/mzflrx/AndroidStudioProjects/Telegram/TMessagesProj/jni/tgnet/Datacenter.cpp:377:62: note: place parentheses around the '&&' expression to silence this warning
C/C++: /home/mzflrx/AndroidStudioProjects/Telegram/TMessagesProj/jni/tgnet/Datacenter.cpp:445:62: warning: '&&' within '||' [-Wlogical-op-parentheses]
C/C++: /home/mzflrx/AndroidStudioProjects/Telegram/TMessagesProj/jni/tgnet/Datacenter.cpp:445:62: note: place parentheses around the '&&' expression to silence this warning
C/C++: clang-8: warning: argument unused during compilation: '-Xclang -load -Xclang /home/mzflrx/Download/llvm-8.0.0-build/lib/LLVMmypass.so' [-Wunused-command-line-argument]
C/C++: clang-8: warning: argument unused during compilation: '-Xclang -load -Xclang /home/mzflrx/Download/llvm-8.0.0-build/lib/LLVMmypass.so' [-Wunused-command-line-argument]
C/C++: clang-8: warning: argument unused during compilation: '-Xclang -load -Xclang /home/mzflrx/Download/llvm-8.0.0-build/lib/LLVMmypass.so' [-Wunused-command-line-argument]
C/C++: clang-8: warning: argument unused during compilation: '-Xclang -load -Xclang /home/mzflrx/Download/llvm-8.0.0-build/lib/LLVMmypass.so' [-Wunused-command-line-argument]
……
I don't know why clan doesn't use pass in Android studio, but if you compile a simple cpp file with clang alone, the function name is printed.
This is part of the CmakeLists .txt settings in Android Studio：
SET(clang_llvm_dir /home/mzflrx/下载/llvm-8.0.0-build)
set(CMAKE_C_COMPILER ${clang_llvm_dir}/bin/clang)
set(CMAKE_CXX_COMPILER ${clang_llvm_dir}/bin/clang++)
SET(LLVM_DIR ${clang_llvm_dir}/lib/cmake/llvm)
SET(CMAKE_PREFIX_PATH /${clang_llvm_dir}/lib/cmake)
SET(OBFUSCATOR_FLAGS "-Xclang -load -Xclang /home/mzflrx/Download/llvm-8.0.0-build/lib/LLVMmypass.so")
set(CMAKE_CXX_FLAGS "-std=c++14 -DANDROID -g ${OBFUSCATOR_FLAGS}")
set(CMAKE_C_FLAGS "-w -std=c11 -DANDROID -D_LARGEFILE_SOURCE=1 -g ${OBFUSCATOR_FLAGS}")
...
#tgnet
add_library(tgnet STATIC
tgnet/ApiScheme.cpp
tgnet/BuffersStorage.cpp
tgnet/ByteArray.cpp
tgnet/ByteStream.cpp
tgnet/Connection.cpp
tgnet/ConnectionSession.cpp
tgnet/ConnectionsManager.cpp
tgnet/ConnectionSocket.cpp
tgnet/Datacenter.cpp
tgnet/EventObject.cpp
tgnet/FileLog.cpp
tgnet/MTProtoScheme.cpp
tgnet/NativeByteBuffer.cpp
tgnet/Request.cpp
tgnet/Timer.cpp
tgnet/TLObject.cpp
tgnet/ProxyCheckInfo.cpp
tgnet/Handshake.cpp
tgnet/Config.cpp)
target_compile_options(tgnet PUBLIC
-Wall -frtti -finline-functions -ffast-math -Os ${OBFUSCATOR_FLAGS})
...