Only support 64bit?

[logicvv]

Hi,
I'm trying to compile to 32 bit binary code, which used arm-none-linux-gnueabihf.
However, it seems not work on 32 bits.

The error shows:

/opt/gcc-arm-10.2-2020.11-x86_64-arm-none-linux-gnueabihf/bin/../lib/gcc/arm-none-linux-gnueabihf/10.2.1/../../../../arm-none-linux-gnueabihf/bin/ld: skipping incompatible ./2-sentencepiece/lib/libsentencepiece.so when searching for -lsentencepiece
/opt/gcc-arm-10.2-2020.11-x86_64-arm-none-linux-gnueabihf/bin/../lib/gcc/arm-none-linux-gnueabihf/10.2.1/../../../../arm-none-linux-gnueabihf/bin/ld: skipping incompatible ./2-sentencepiece/lib/libsentencepiece.a when searching for -lsentencepiece
/opt/gcc-arm-10.2-2020.11-x86_64-arm-none-linux-gnueabihf/bin/../lib/gcc/arm-none-linux-gnueabihf/10.2.1/../../../../arm-none-linux-gnueabihf/bin/ld: cannot find -lsentencepiece
/opt/gcc-arm-10.2-2020.11-x86_64-arm-none-linux-gnueabihf/bin/../lib/gcc/arm-none-linux-gnueabihf/10.2.1/../../../../arm-none-linux-gnueabihf/bin/ld: skipping incompatible ./2-sentencepiece/lib/libsentencepiece.so when searching for -lsentencepiece
collect2: error: ld returned 1 exit status

Could you please explain why this happen? Or if I just compile this to 64 bit binary code, dose it work?
Does Sentencepiece support to work on any hard devices?

[taku910]

Could you elaborate on the build options, command line log and environment?
There is not enough information to comment on anything.

[logicvv]

Hi,
Thanks for your reply, the compiler I used is :
arm-none-linux-gnueabihf-g++ (GNU Toolchain for the A-profile Architecture 10.2-2020.11 (arm-10.16)) 10.2.1 20201103

For the complie steps, what I did is:
mkdir build
cd build
cmake -DCMAKE_INSTALL_PREFIX=/mnt/fileroot/cpp_test/2-sentencepiece ..
CC=arm-none-linux-gnueabihf-gcc CXX=arm-none-linux-gnueabihf-g++ make CXXFLAGS=-std=c++17
CC=arm-none-linux-gnueabihf-gcc CXX=arm-none-linux-gnueabihf-g++ CXXFLAGS=-std=c++17 make install

Once I have done above steps, and then I tried the command line:
file -L /mnt/fileroot/cpp_test/2-sentencepiece/lib/libsentencepiece.so
it shows this is a 64 bit file.

However, when I compile the testing code, which is:

########################################

#include
#include
#include
#include <sentencepiece_processor.h>

int main() {
// Create a SentencePiece processor
sentencepiece::SentencePieceProcessor sp;
// Load the trained SentencePiece model
sp.Load("./eng.model");
// Encode a sentence
std::string sentence = "This is a test sentence.";
std::vectorstd::string pieces;
sp.Encode(sentence, &pieces);
// Print the encoded pieces
for (const auto& piece : pieces) {
std::cout << piece << " ";
}
std::cout << std::endl;
return 0;
}

#######################
The compile command for this test file is:

arm-none-linux-gnueabihf-g++ -std=c++17 -march=armv8-a -o myapp main.cpp -lsentencepiece -I./2-sentencepiece/include -L./2-sentencepiece/lib -Wl,-rpath-link,./2-sentencepiece/lib

which shows an error:
./2-sentencepiece/lib/libsentencepiece.so: file not recognized: file format not recognized
collect2: error: ld returned 1 exit status

And then I used same complier to complied another c++ code, which does not dependent on sentencepiece, and I tried:
file myapp

and it shows it is a 32 bit file.

So, the error might be the test code and the sentencepiece are different bit files.

Then I want to transfer the sentencepiece to 32bit manually, which used:
##############################

cmake -DCMAKE_INSTALL_PREFIX=/mnt/fileroot/tingting.dong/cpp_test/2-sentencepiece -DCMAKE_C_FLAGS=-m32 -DCMAKE_CXX_FLAGS=-m32 ..
CC=arm-none-linux-gnueabihf-gcc CXX=arm-none-linux-gnueabihf-g++ make CXXFLAGS=-std="c++17 -m32"
CXX=arm-none-linux-gnueabihf-g++ CXXFLAGS="-std=c++17 -m32" make install
#####################################

Then I checked the file is it compiled to 32bit, then I tried to compile the test code again, and it shows the error:

/opt/gcc-arm-10.2-2020.11-x86_64-arm-none-linux-gnueabihf/bin/../lib/gcc/arm-none-linux-gnueabihf/10.2.1/../../../../arm-none-linux-gnueabihf/bin/ld: skipping incompatible ./2-sentencepiece/lib/libsentencepiece.so when searching for -lsentencepiece
/opt/gcc-arm-10.2-2020.11-x86_64-arm-none-linux-gnueabihf/bin/../lib/gcc/arm-none-linux-gnueabihf/10.2.1/../../../../arm-none-linux-gnueabihf/bin/ld: skipping incompatible ./2-sentencepiece/lib/libsentencepiece.a when searching for -lsentencepiece
/opt/gcc-arm-10.2-2020.11-x86_64-arm-none-linux-gnueabihf/bin/../lib/gcc/arm-none-linux-gnueabihf/10.2.1/../../../../arm-none-linux-gnueabihf/bin/ld: cannot find -lsentencepiece
/opt/gcc-arm-10.2-2020.11-x86_64-arm-none-linux-gnueabihf/bin/../lib/gcc/arm-none-linux-gnueabihf/10.2.1/../../../../arm-none-linux-gnueabihf/bin/ld: skipping incompatible ./2-sentencepiece/lib/libsentencepiece.so when searching for -lsentencepiece
collect2: error: ld returned 1 exit status

Plese give me any hint how this can work? Thank you.