同态加密库HELIB编译问题

apt-get install patchelf
 sudo apt-get update 
 sudo apt-get install build-essential software-properties-common -y 
 sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y 
 sudo apt-get update 
 sudo apt-get install gcc-snapshot -y 
 sudo apt-get update
 sudo apt-get install gcc-9 g++-9 -y 

执行cmake .. 报错

CMake Error at /usr/share/cmake-3.16/Modules/FindPackageHandleStandardArgs.cmake:146 (message):
  GMP required dynamic shared library has not been found in
  /root/gmp-6.2.1/.libs.: Found unsuitable version "6.1.2", but required is
  at least "6.2.0" (found /usr/lib/x86_64-linux-gnu/libgmp.so)
Call Stack (most recent call first):
  /usr/share/cmake-3.16/Modules/FindPackageHandleStandardArgs.cmake:391 (_FPHSA_FAILURE_MESSAGE)
  cmake/FindGMP.cmake:123 (find_package_handle_standard_args)
  CMakeLists.txt:322 (find_package)


-- Configuring incomplete, errors occurred!
See also "/root/HElib-master/build/CMakeFiles/CMakeOutput.log".
See also "/root/HElib-master/build/CMakeFiles/CMakeError.log".

解决方案就是深入到cmake的源文件中去看：

if (GMP_DIR)
  # If user-specified folders: look there
  find_library(GMP_LIB
               NAMES gmp libgmp
               PATHS ${GMP_DIR}
               PATH_SUFFIXES ${lib_suffixes}
               NO_DEFAULT_PATH
               DOC "GMP library")

  # Headers here are only to check version
  find_path(GMP_HEADERS
            NAMES gmp.h
            PATHS ${GMP_DIR}
            PATH_SUFFIXES ${header_suffixes}
            NO_DEFAULT_PATH
            DOC "GMP headers")

else (GMP_DIR)
  # Else: look in default paths
  find_library(GMP_LIB
               NAMES gmp libgmp
               PATH_SUFFIXES ${lib_suffixes}
               DOC "GMP library")

  # Headers here are only to check version
  find_path(GMP_HEADERS
            NAMES gmp.h
            PATH_SUFFIXES ${header_suffixes}
            DOC "GMP headers")
endif (GMP_DIR)

这里面不仅仅需要定义GMP_DIR，还要定义GMP_HEADERS和GMP_LIB

如下所示：

cmake -DGMP_DIR=/root/gmp-6.2.1 -DGMP_LIB=/root/gmp-6.2.1/.libs -DGMP_HEADERS=/root/gmp-6.2.1 -DPACKAGE_BUILD=ON -DCMAKE_INSTALL_PREFIX=/home/helib_install ..

继续执行上面的命令，NTL库也是同样的问题，手工下载NTL后进行编译

CMake Error at /usr/share/cmake-3.16/Modules/FindPackageHandleStandardArgs.cmake:146 (message):
  NTL required dynamic shared library has not been found.  (Try cmake
  -DNTL_DIR=).  (missing: NTL_LIB NTL_HEADERS) (Required is at
  least version "11.4.3")
Call Stack (most recent call first):
  /usr/share/cmake-3.16/Modules/FindPackageHandleStandardArgs.cmake:393 (_FPHSA_FAILURE_MESSAGE)
  cmake/FindNTL.cmake:110 (find_package_handle_standard_args)
  CMakeLists.txt:328 (find_package)


-- Configuring incomplete, errors occurred!
See also "/root/HElib-master/build/CMakeFiles/CMakeOutput.log".
See also "/root/HElib-master/build/CMakeFiles/CMakeError.log".

make[1]: Leaving directory '/root/ntl-11.5.1/src'
make setup3
make[1]: Entering directory '/root/ntl-11.5.1/src'
g++ -I../include -I.  -g -O2 -pthread -march=native   -o gen_gmp_aux gen_gmp_aux.cpp  -lgmp  -lm
./gen_gmp_aux > ../include/NTL/gmp_aux.h
NTL_GMP_LIP flag set
GMP version check (6.1.2/6.2.1)
*** version number mismatch: inconsistency between gmp.h and libgmp
Aborted (core dumped)
makefile:360: recipe for target 'setup3' failed
make[1]: *** [setup3] Error 134
make[1]: Leaving directory '/root/ntl-11.5.1/src'
makefile:324: recipe for target 'setup-phase' failed
make: *** [setup-phase] Error 2

再/root/gmp-6.2.1目录中把.libs目录重命名为libs,  把头文件都复制到 /root/gmp-6.2.1/include中

然后在执行如下命令即可：
cd  /root/ntl-11.5.1/src
./configure GMP_PREFIX=/root/gmp-6.2.1
make 
make install

最后再重新执行

cmake -DGMP_DIR=/root/gmp-6.2.1 -DGMP_LIB=/root/gmp-6.2.1/.libs -DGMP_HEADERS=/root/gmp-6.2.1 -DPACKAGE_BUILD=ON -DCMAKE_INSTALL_PREFIX=/home/helib_install ..

编译examples

cd /root/HElib-2.2.0/examples
mkdir build
cd build
cmake -Dhelib_DIR=/home/helib_install/helib_pack/share/cmake/helib ..
make