使用 Emscripten 编译 GMP/MPFR

好吧，这已经让我发疯了。我已经尝试了至少一个月，但互联网上的任何地方都没有帮助。

我按照以下步骤操作this https://github.com/kripken/gmp.js。当我执行这些步骤时，甚至这个示例也不起作用，因为当我这样做时，我得到了这个。

bitcode ==> javascript
warning: unresolved symbol: __gmpz_cmp
warning: unresolved symbol: __gmpz_mul_ui
warning: unresolved symbol: __gmpz_submul_ui
warning: unresolved symbol: __gmpz_init_set_ui
warning: unresolved symbol: __gmpz_mul_2exp
warning: unresolved symbol: __gmpz_init
warning: unresolved symbol: __gmpz_fdiv_qr
warning: unresolved symbol: __gmpz_add

当我运行生成的complete.js 文件时 -

missing function: __gmpz_init
-1
-1

/home/ubuntu/workspace/gmp.js/complete.js:117
      throw ex;
      ^
abort(-1) at Error
    at jsStackTrace (/home/ubuntu/workspace/gmp.js/complete.js:1045:13)
    at stackTrace (/home/ubuntu/workspace/gmp.js/complete.js:1062:22)
    at abort (/home/ubuntu/workspace/gmp.js/complete.js:6743:44)
    at ___gmpz_init (/home/ubuntu/workspace/gmp.js/complete.js:1744:56)
    at Object._main (/home/ubuntu/workspace/gmp.js/complete.js:4978:2)
    at Object.callMain (/home/ubuntu/workspace/gmp.js/complete.js:6627:30)
    at doRun (/home/ubuntu/workspace/gmp.js/complete.js:6681:60)
    at run (/home/ubuntu/workspace/gmp.js/complete.js:6695:5)
    at Object.<anonymous> (/home/ubuntu/workspace/gmp.js/complete.js:6769:1)
    at Module._compile (module.js:541:32)
If this abort() is unexpected, build with -s ASSERTIONS=1 which can give more information.

这些说明适用于运行 amd64 Debian Buster 的主机。 GMP 似乎不再需要 32 位来与 Emscripten 一起工作（无论如何，32 位 Emscripten 似乎不再受支持？），但我使用了 chroot 来保持干净的环境。安装后，我的 chroot 有 1.6GB 大。但如果可以避免的话，我不建议将它用于计算密集型代码，在一项基准测试中，我的本机代码比在 Nodejs 中运行的使用 Emscripten 编译的相同代码快 15 倍...

Debian Buster chroot

mkdir emscripten
sudo debootstrap buster emscripten
sudo chroot emscripten /bin/bash
echo "deb http://security.debian.org/debian-security buster/updates main" >> /etc/apt/sources.list
apt update
apt install python cmake g++ git lzip wget nodejs m4
echo "none /dev/shm tmpfs rw,nosuid,nodev,noexec 0 0" >> /etc/fstab
mount /dev/shm
echo "none /proc proc defaults 0 0" >> /etc/fstab
mount /proc
adduser emscripten
su - emscripten

最新emsdk

在撰写本文时已安装releases-upstream-b024b71038d1291ed7ec23ecd553bf2c0c8d6da6-64bit and node-12.9.1-64bit:

git clone https://github.com/juj/emsdk.git
cd emsdk
./emsdk install latest
./emsdk activate latest
source ./emsdk_env.sh
mkdir -p ${HOME}/opt/src
cd ${HOME}/opt/src

GMP 6.1.2

wget https://gmplib.org/download/gmp/gmp-6.1.2.tar.lz
tar xf gmp-6.1.2.tar.lz
cd gmp-6.1.2
emconfigure ./configure --disable-assembly --host none --enable-cxx --prefix=${HOME}/opt
make
make install
cd ..

MPFR 4.0.2

wget https://www.mpfr.org/mpfr-current/mpfr-4.0.2.tar.xz
wget https://www.mpfr.org/mpfr-current/allpatches
tar xf mpfr-4.0.2.tar.xz
cd mpfr-4.0.2
patch -N -Z -p1 < ../allpatches 
emconfigure ./configure --host none --prefix=${HOME}/opt --with-gmp=${HOME}/opt
make
make install
cd ..

MPC 1.1.0

wget https://ftp.gnu.org/gnu/mpc/mpc-1.1.0.tar.gz
tar xf mpc-1.1.0.tar.gz
cd mpc-1.1.0
emconfigure ./configure --host none --prefix=${HOME}/opt --with-gmp=${HOME}/opt --with-mpfr=${HOME}/opt
make
make install
cd ..

你好世界

您最喜欢的使用 GMP/MPFR/MPC 的程序：

emcc -o hello.js hello.c \
  ${HOME}/opt/lib/libmpc.a ${HOME}/opt/lib/libmpfr.a ${HOME}/opt/lib/libgmp.a
nodejs hello.js