error: ‘align’ is not a member of ‘std’

[gitCoder1024]

We tried to run the code, but when we run the command "python install.py --tool --ot --sh2pc", this error occurs:
/home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/utils/prg.h: In member function ‘void emp::PRG::random_data_unaligned(void*, int)’:
/home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/utils/prg.h:76:6: error: ‘align’ is not a member of ‘std’
if(std::align(sizeof(block), sizeof(block), aligned_data, size)) {
^
In file included from /home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/io/io_channel.h:4:0,
from /home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/io/file_io_channel.h:5,
from /home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/emp-tool.h:2,
from /home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/test/prg.cpp:1:
/home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/utils/prg.h: In member function ‘void emp::PRG::random_data_unaligned(void*, int)’:
/home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/utils/prg.h:76:6: error: ‘align’ is not a member of ‘std’
if(std::align(sizeof(block), sizeof(block), aligned_data, size)) {
^
In file included from /home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/io/io_channel.h:4:0,
from /home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/io/file_io_channel.h:5,
from /home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/emp-tool.h:2,
from /home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/test/hash.cpp:1:
/home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/utils/prg.h: In member function ‘void emp::PRG::random_data_unaligned(void*, int)’:
/home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/utils/prg.h:76:6: error: ‘align’ is not a member of ‘std’
if(std::align(sizeof(block), sizeof(block), aligned_data, size)) {
^
In file included from /home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/io/io_channel.h:4:0,
from /home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/io/file_io_channel.h:5,
from /home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/emp-tool.h:2,
from /home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/test/netio.cpp:1:
/home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/utils/prg.h: In member function ‘void emp::PRG::random_data_unaligned(void*, int)’:
/home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/utils/prg.h:76:6: error: ‘align’ is not a member of ‘std’
if(std::align(sizeof(block), sizeof(block), aligned_data, size)) {
^
In file included from /home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/io/file_io_channel.h:5:0,
from /home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/emp-tool.h:2,
from /home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/test/prp.cpp:1:
/home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/io/io_channel.h: In member function ‘void emp::IOChannel::send_bool(bool*, size_t)’:
/home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/io/io_channel.h:56:26: error: ‘align’ is not a member of ‘std’
const void * aligned = std::align(alignof(uint64_t), sizeof(uint64_t), ptr, space);
^
/home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/io/io_channel.h: In member function ‘void emp::IOChannel::recv_bool(bool*, size_t)’:
/home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/io/io_channel.h:69:20: error: ‘align’ is not a member of ‘std’
void * aligned = std::align(alignof(uint64_t), sizeof(uint64_t), ptr, space);
^
In file included from /home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/io/file_io_channel.h:5:0,
from /home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/emp-tool.h:2,
from /home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/test/hash.cpp:1:
/home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/io/io_channel.h: In member function ‘void emp::IOChannel::send_bool(bool*, size_t)’:
/home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/io/io_channel.h:56:26: error: ‘align’ is not a member of ‘std’
const void * aligned = std::align(alignof(uint64_t), sizeof(uint64_t), ptr, space);
^
/home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/io/io_channel.h: In member function ‘void emp::IOChannel::recv_bool(bool*, size_t)’:
/home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/io/io_channel.h:69:20: error: ‘align’ is not a member of ‘std’
void * aligned = std::align(alignof(uint64_t), sizeof(uint64_t), ptr, space);
^
In file included from /home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/io/file_io_channel.h:5:0,
from /home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/emp-tool.h:2,
from /home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/test/prg.cpp:1:
/home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/io/io_channel.h: In member function ‘void emp::IOChannel::send_bool(bool*, size_t)’:
/home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/io/io_channel.h:56:26: error: ‘align’ is not a member of ‘std’
const void * aligned = std::align(alignof(uint64_t), sizeof(uint64_t), ptr, space);
^
/home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/io/io_channel.h: In member function ‘void emp::IOChannel::recv_bool(bool*, size_t)’:
/home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/io/io_channel.h:69:20: error: ‘align’ is not a member of ‘std’
void * aligned = std::align(alignof(uint64_t), sizeof(uint64_t), ptr, space);
^
In file included from /home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/io/file_io_channel.h:5:0,
from /home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/emp-tool.h:2,
from /home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/test/netio.cpp:1:
/home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/io/io_channel.h: In member function ‘void emp::IOChannel::send_bool(bool*, size_t)’:
/home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/io/io_channel.h:56:26: error: ‘align’ is not a member of ‘std’
const void * aligned = std::align(alignof(uint64_t), sizeof(uint64_t), ptr, space);
^
/home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/io/io_channel.h: In member function ‘void emp::IOChannel::recv_bool(bool*, size_t)’:
/home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/io/io_channel.h:69:20: error: ‘align’ is not a member of ‘std’
void * aligned = std::align(alignof(uint64_t), sizeof(uint64_t), ptr, space);
^
In file included from /home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/emp-tool.h:15:0,
from /home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/test/prp.cpp:1:
/home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/circuits/sha3_256.h: In function ‘int emp::sha3_256(uint8_t*, const T*, size_t)’:
/home/users/dase212lxy/tmp/emp-sh2pc-master/emp-tool/emp-tool/circuits/sha3_256.h:32:37: error: there are no arguments to ‘EVP_sha3_256’ that depend on a template parameter, so a declaration of ‘EVP_sha3_256’ must be available [-fpermissive]
const EVP_MD * algo = EVP_sha3_256();

[Stu-Yang]

The errors you're encountering seem to stem from two issues:

1. std::align Not Found:

   • The std::align function is available starting from C++17. If your compiler or build system is not set to use C++17, this error will occur.

2. EVP_sha3_256 Undefined:

   • This function is part of OpenSSL 1.1.1 or newer. If your system has an older version of OpenSSL or is missing it, this error will occur.

Resolution Steps:

1. Fixing std::align Error

• Ensure your compiler supports C++17. Run the following command to check the version of g++ or clang:

  g++ --version

  For GCC, version 7 or newer is recommended.

• Update your compiler flags to include -std=c++17. Modify the CMakeLists.txt file in the emp-sh2pc project. Find the line that sets the compiler flags and ensure it includes:

  set(CMAKE_CXX_STANDARD 17)
  set(CMAKE_CXX_STANDARD_REQUIRED ON)

2. Fixing EVP_sha3_256 Error

• Verify your OpenSSL version using the command:

  openssl version

  If it's older than 1.1.1, you need to update OpenSSL. On Ubuntu, you can do this with:

  sudo apt update
  sudo apt install libssl-dev

  On other systems, ensure the latest OpenSSL development libraries are installed.

• If OpenSSL is installed correctly, make sure your build system links against it. For CMake, include:

  find_package(OpenSSL REQUIRED)
  include_directories(${OPENSSL_INCLUDE_DIR})
  target_link_libraries(<the_target_name> ${OPENSSL_LIBRARIES})

3. Clean and Rebuild

• After making the changes, clean your build directory:

  cmake ..
  make -j 4

4. Re-run the Install Command

Once the build completes successfully, try re-running the install command:

python install.py --tool --ot --sh2pc