如何在 VS2015 中的 windows 10 上构建 snappy？

Question

I hava download snappy 1.1.8 on here ,and follow the readme to compile on my computer,

mkdir build

cd build && cmake../

then I open the .sln file in VS2015,build the lib ,there are no errors.

then I write an example like below,and add the lib to my project:

class Sna
{
public:
    Sna(string &data) :data_(data)
    {
    }

    void compress()
    {
        auto start = high_resolution_clock::now();
        snappy::Compress(data_.data(), data_.size(), &compressed_);

        auto end = high_resolution_clock::now();
        cout << "compress use time: " << duration_cast<microseconds>(end - start).count() << " microseconds" << endl;
    }

    void unCompress()
    {
        auto start = high_resolution_clock::now();
        snappy::Uncompress(compressed_.data(),compressed_.size(),&recoverd_);
        auto end = high_resolution_clock::now();
        cout << "unCompress use time: " << duration_cast<microseconds>(end - start).count() << " microseconds" << endl;
    }

    bool check()
    {
        return !data_.compare(recoverd_) ? true : false;
    }

    double ratio()
    {
        int temp = int(data_.length() - compressed_.length());
        double d = (double)temp / data_.length();
        return d * 100;
    }

private:
    string data_, compressed_, recoverd_;
};

int main()
{
    //read data from file
    //...

    Sna sna(data);
    sna.compress();
    sna.unCompress();

    return 0;
}

the compress function is ok,but when execute the unCompress function,the program crashed,it gave me this error:

0xC000001D: Illegal Instruction。

on snappy.cc line 720:

 #if SNAPPY_HAVE_BMI2
  return _bzhi_u32(v, 8 * n);

I have tried:

1. fallback the version of snappy 1.1.7,it works well for me,don't have this problem.
2. when compile the lib,set the Enable Enhanced Instruction Set to Advanced Vector Extensions 2 (/arch:AVX2) ,but it still had other problems.

I don't know which step I did wrong? and how to solve this problem?

Answer 1

Thanks to @rpress, solved this problem.

found the file CMakeLists.txt .and comment out the line 118 to 112 like below

# check_cxx_source_compiles("
# #include <immintrin.h>
# int main() {
#   return _bzhi_u32(0, 1);
# }" SNAPPY_HAVE_BMI2)