[工欲善其事|必先利其器]Emscripten1.39.4工具链的安装与简单使用/*WebAssembly从入门到放弃*/

# Get the emsdk repo
git clone https://github.com/emscripten-core/emsdk.git

# Enter that directory
cd emsdk

# Fetch the latest version of the emsdk (not needed the first time you clone)
git pull

# Download and install the latest SDK tools.
./emsdk install latest

# Make the "latest" SDK "active" for the current user. (writes ~/.emscripten file)
./emsdk activate latest

# Activate PATH and other environment variables in the current terminal
source ./emsdk_env.sh

Microsoft Windows [版本 10.0.18363.592]
(c) 2019 Microsoft Corporation。保留所有权利。


C:\Users\ass\cache\projects\code\HTML\webAssembly\emsdk>emsdk update
You seem to have bootstrapped Emscripten SDK by cloning from GitHub. In this case, use "git pull" instead of "emsdk update" to update emsdk. (Not doing that automatically in case you have local changes)
Alternatively, use "emsdk update-tags" to refresh the latest list of tags from the different Git repositories.

C:\Users\ass\cache\projects\code\HTML\webAssembly\emsdk>git pull
There is no tracking information for the current branch.
Please specify which branch you want to merge with.
See git-pull(1) for details.

    git pull <remote> <branch>

If you wish to set tracking information for this branch you can do so with:

    git branch --set-upstream-to=origin/<branch> master


C:\Users\ass\cache\projects\code\HTML\webAssembly\emsdk>emsdk install --global latest
Installing SDK 'sdk-releases-upstream-967836071d96d9b7894e492382f5fcb96423fc07-64bit'..
Installing tool 'node-12.9.1-64bit'..
Error: Downloading URL 'https://storage.googleapis.com/webassembly/emscripten-releases-builds/deps/node-v12.9.1-win-x64.zip': <urlopen error unknown url type: https>
Warning: Possibly SSL/TLS issue. Update or install Python SSL root certificates (2048-bit or greater) supplied in Python folder or https://pypi.org/project/certifi/ and try again.
Installation failed!


C:\Users\ass\cache\projects\code\HTML\webAssembly\emsdk>emsdk install --global latest
Installing SDK 'sdk-releases-upstream-967836071d96d9b7894e492382f5fcb96423fc07-64bit'..
Installing tool 'node-12.9.1-64bit'..
Downloading: C:\Users\ass\cache/projects/code/HTML/webAssembly/emsdk/zips/node-v12.9.1-win-x64.zip from https://storage.googleapis.com/webassembly/emscripten-releases-builds/deps/node-v12.9.1-win-x64.zip, 35200117 Bytes
Unpacking 'C:\Users\ass\cache/projects/code/HTML/webAssembly/emsdk/zips/node-v12.9.1-win-x64.zip' to 'C:\Users\ass\cache/projects/code/HTML/webAssembly/emsdk/node/12.9.1_64bit'
Done installing tool 'node-12.9.1-64bit'.
Installing tool 'python-2.7.13.1-64bit'..
Downloading: C:\Users\ass\cache/projects/code/HTML/webAssembly/emsdk/zips/WinPython-64bit-2.7.13.1Zero.zip from https://storage.googleapis.com/webassembly/emscripten-releases-builds/deps/WinPython-64bit-2.7.13.1Zero.zip, 41285159 Bytes
Unpacking 'C:\Users\ass\cache/projects/code/HTML/webAssembly/emsdk/zips/WinPython-64bit-2.7.13.1Zero.zip' to 'C:\Users\ass\cache/projects/code/HTML/webAssembly/emsdk/python/2.7.13.1_64bit'
Done installing tool 'python-2.7.13.1-64bit'.
Installing tool 'java-8.152-64bit'..
Downloading: C:\Users\ass\cache/projects/code/HTML/webAssembly/emsdk/zips/portable_jre_8_update_152_64bit.zip from https://storage.googleapis.com/webassembly/emscripten-releases-builds/deps/portable_jre_8_update_152_64bit.zip, 69241499 Bytes
Unpacking 'C:\Users\ass\cache/projects/code/HTML/webAssembly/emsdk/zips/portable_jre_8_update_152_64bit.zip' to 'C:\Users\ass\cache/projects/code/HTML/webAssembly/emsdk/java/8.152_64bit'
Done installing tool 'java-8.152-64bit'.
Installing tool 'releases-upstream-967836071d96d9b7894e492382f5fcb96423fc07-64bit'..
Downloading: C:\Users\ass\cache/projects/code/HTML/webAssembly/emsdk/zips/967836071d96d9b7894e492382f5fcb96423fc07-wasm-binaries.zip from https://storage.googleapis.com/webassembly/emscripten-releases-builds/win/967836071d96d9b7894e492382f5fcb96423fc07/wasm-binaries.zip, 528244786 Bytes
Unpacking 'C:\Users\ass\cache/projects/code/HTML/webAssembly/emsdk/zips/967836071d96d9b7894e492382f5fcb96423fc07-wasm-binaries.zip' to 'C:\Users\ass\cache/projects/code/HTML/webAssembly/emsdk/upstream'
Done installing tool 'releases-upstream-967836071d96d9b7894e492382f5fcb96423fc07-64bit'.
up to date in 0.27s
Done installing SDK 'sdk-releases-upstream-967836071d96d9b7894e492382f5fcb96423fc07-64bit'.

C:\Users\ass\cache\projects\code\HTML\webAssembly\emsdk>emsdk activate latest
Writing .emscripten configuration file to user home directory C:\Users\assTeam/
The Emscripten configuration file C:\Users\assTeam\.emscripten has been rewritten with the following contents:

NODE_JS = 'C:\Users\ass\cache/projects/code/HTML/webAssembly/emsdk/node/12.9.1_64bit/bin/node.exe'
PYTHON = 'C:\Users\ass\cache/projects/code/HTML/webAssembly/emsdk/python/2.7.13.1_64bit/python-2.7.13.amd64/python.exe'
JAVA = 'C:\Users\ass\cache/projects/code/HTML/webAssembly/emsdk/java/8.152_64bit/bin/java.exe'
LLVM_ROOT = 'C:\Users\ass\cache/projects/code/HTML/webAssembly/emsdk/upstream/bin'
BINARYEN_ROOT = 'C:\Users\ass\cache/projects/code/HTML/webAssembly/emsdk/upstream'
EMSCRIPTEN_ROOT = 'C:\Users\ass\cache/projects/code/HTML/webAssembly/emsdk/upstream/emscripten'
TEMP_DIR = 'c:/users/songx/appdata/local/temp'
COMPILER_ENGINE = NODE_JS
JS_ENGINES = [NODE_JS]

Adding directories to PATH:
PATH += C:\Users\ass\cache\projects\code\HTML\webAssembly\emsdk
PATH += C:\Users\ass\cache\projects\code\HTML\webAssembly\emsdk\node\12.9.1_64bit\bin
PATH += C:\Users\ass\cache\projects\code\HTML\webAssembly\emsdk\python\2.7.13.1_64bit\python-2.7.13.amd64
PATH += C:\Users\ass\cache\projects\code\HTML\webAssembly\emsdk\java\8.152_64bit\bin
PATH += C:\Users\ass\cache\projects\code\HTML\webAssembly\emsdk\upstream\emscripten

Setting environment variables:
EMSDK = C:\Users\ass\cache/projects/code/HTML/webAssembly/emsdk
EM_CONFIG = C:\Users\assTeam\.emscripten
EMSDK_NODE = C:\Users\ass\cache\projects\code\HTML\webAssembly\emsdk\node\12.9.1_64bit\bin\node.exe
EMSDK_PYTHON = C:\Users\ass\cache\projects\code\HTML\webAssembly\emsdk\python\2.7.13.1_64bit\python-2.7.13.amd64\python.exe
JAVA_HOME = C:\Users\ass\cache\projects\code\HTML\webAssembly\emsdk\java\8.152_64bit


Set the following tools as active:
   node-12.9.1-64bit
   python-2.7.13.1-64bit
   java-8.152-64bit
   releases-upstream-967836071d96d9b7894e492382f5fcb96423fc07-64bit

The changes made to environment variables only apply to the currently running shell instance. Use the 'emsdk_env.bat' to re-enter this environment later, or if you'd like to permanently register this environment globally to all users in Windows Registry, rerun this command with the option --global.

C:\Users\ass\cache\projects\code\HTML\webAssembly\emsdk>emcc -v
emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 1.39.6
clang version 10.0.0 (Cswircachegitchromium.googlesource.com-external-github.com-llvm-llvm--project 06cfcdcca7de9c88a1e885eff0d0c4c07090ad48)
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: C:\Users\ass\cache/projects/code/HTML/webAssembly/emsdk/upstream/bin
shared:INFO: (Emscripten: Running sanity checks)

#include <stdio.h>

int main(int argc, char ** argv) {
    printf("WebAssembly module loaded successfully!\n");
}
// 返回2020
int test() {
    return 2020;
}

emcc demo.c -s WASM=1 -O3 -o demo.js

C:\Users\ass\cache\projects\code\HTML\webAssembly\emsdk>emcc demo.c -s WASM=1 -O3 -o demo.js
cache:INFO: generating system library: libcompiler_rt.a... (this will be cached in "C:\Users\assTeam\.emscripten_cache\wasm-obj\libcompiler_rt.a" for subsequent builds)
cache:INFO:  - ok
cache:INFO: generating system library: libc-wasm.a... (this will be cached in "C:\Users\assTeam\.emscripten_cache\wasm-obj\libc-wasm.a" for subsequent builds)
cache:INFO:  - ok
cache:INFO: generating system library: libdlmalloc.a... (this will be cached in "C:\Users\assTeam\.emscripten_cache\wasm-obj\libdlmalloc.a" for subsequent builds)
cache:INFO:  - ok
cache:INFO: generating system library: libpthread_stub.a... (this will be cached in "C:\Users\assTeam\.emscripten_cache\wasm-obj\libpthread_stub.a" for subsequent builds)
cache:INFO:  - ok
cache:INFO: generating system library: libc_rt_wasm.a... (this will be cached in "C:\Users\assTeam\.emscripten_cache\wasm-obj\libc_rt_wasm.a" for subsequent builds)
cache:INFO:  - ok
cache:INFO: generating system library: libsockets.a... (this will be cached in "C:\Users\assTeam\.emscripten_cache\wasm-obj\libsockets.a" for subsequent builds)
cache:INFO:  - ok