Hello WebAssembly! 奮闘メモ

Hello WebAssembly! 奮闘メモお題
		http://webassembly.org/getting-started/developers-guide/ をやりたい
		C言語で書いた Hello, world! をブラウザで表示する

GCE (Google Compute Engine) の Debian (n1-standard-1; vCPU x 1、メモリ 3.75 GB) で動かしたときのメモ
	最終的にはメモリ 8GB に増設した
	最終的にはハードディスク30GB必要だった
GCE上でブラウザ起動はできないだろうから，最終生成物の .html など一式をを作ってダウンロードしてローカル表示する

cmakeのバージョン古すぎた
	 apt-get からは必要とされるバージョン入れられなかった
CMake 3.4.3 or higher is required.  You are running version 3.0.2
自分で入れる
	https://www.claudiokuenzler.com/blog/611/installing-cmake-3.4.1-ubuntu-14.04-trusty-using-alternatives#.WKM0tRLyhTY
	これを v3.4.3 でやる
		CMakeうまくいった

挑戦中
	$ ./emsdk install sdk-incoming-64bit binaryen-master-64bit 
	時間かかる（＝お金かかる）

???
err.logCopied!
Scanning dependencies of target llvm-lto
[ 55%] Building CXX object tools/llvm-lto/CMakeFiles/llvm-lto.dir/llvm-lto.cpp.o
[ 55%] Linking CXX executable ../../bin/llvm-lto

collect2: error: ld returned 1 exit status
tools/llvm-lto/CMakeFiles/llvm-lto.dir/build.make:141: recipe for target 'bin/llvm-lto' failed
make[2]: *** [bin/llvm-lto] Error 1
CMakeFiles/Makefile2:6532: recipe for target 'tools/llvm-lto/CMakeFiles/llvm-lto.dir/all' failed
make[1]: *** [tools/llvm-lto/CMakeFiles/llvm-lto.dir/all] Error 2
Makefile:149: recipe for target 'all' failed
make: *** [all] Error 2
Build failed due to exception!
Working directory: /home/daiki/emsdk/clang/fastcomp/build_incoming_64
Command '['make', '-j1']' returned non-zero exit status 2
Installation failed!
これ? 似てるけど若干違う．
	https://github.com/kripken/emscripten/issues/4470
	sudo

	$ sudo ./emsdk install sdk-incoming-64bit binaryen-master-64bit
		実行していく
!!!!
err.logCopied!
[ 68%] Linking CXX static library ../../../../lib/libclangParse.a
/usr/bin/ranlib: ../../../../lib/libclangParse.a: No space left on device
tools/clang/lib/Parse/CMakeFiles/clangParse.dir/build.make:458: recipe for target 'lib/libclangParse.a' failed
make[2]: *** [lib/libclangParse.a] Error 1
make[2]: *** Deleting file 'lib/libclangParse.a'
CMakeFiles/Makefile2:8578: recipe for target 'tools/clang/lib/Parse/CMakeFiles/clangParse.dir/all' failed
make[1]: *** [tools/clang/lib/Parse/CMakeFiles/clangParse.dir/all] Error 2
Makefile:149: recipe for target 'all' failed
make: *** [all] Error 2
Build failed due to exception!
Working directory: /home/daiki/emsdk/clang/fastcomp/build_incoming_64
Command '['make', '-j1']' returned non-zero exit status 2
Installation failed!

~/emsdk$ df
Filesystem     1K-blocks     Used Available Use% Mounted on
/dev/sda1       10188088 10040576         0 100% /
udev               10240        0     10240   0% /dev
tmpfs             760204     8404    751800   2% /run
tmpfs            1900508        0   1900508   0% /dev/shm
tmpfs               5120        0      5120   0% /run/lock
tmpfs            1900508        0   1900508   0% /sys/fs/cgroup

~/emsdk$ df -i
Filesystem     Inodes  IUsed  IFree IUse% Mounted on
/dev/sda1      655360 149778 505582   23% /
udev           472930    280 472650    1% /dev
tmpfs          475127    293 474834    1% /run
tmpfs          475127      1 475126    1% /dev/shm
tmpfs          475127      8 475119    1% /run/lock
tmpfs          475127     13 475114    1% /sys/fs/cgroup

→ ディスク 10GB では足りない???
	20GBにした
		https://cloud.google.com/compute/docs/disks/add-persistent-disk?hl=ja#create_disk
df.logCopied!
Filesystem     1K-blocks     Used Available Use% Mounted on
/dev/sda1       20509288 10045780   9503604  52% /
udev               10240        0     10240   0% /dev
tmpfs             760204     8404    751800   2% /run
tmpfs            1900508        0   1900508   0% /dev/shm
tmpfs               5120        0      5120   0% /run/lock
tmpfs            1900508        0   1900508   0% /sys/fs/cgroup

	$ sudo ./emsdk install sdk-incoming-64bit binaryen-master-64bit
		改めて実行していく

???
err.logCopied!
[ 91%] Linking CXX executable ../../../../bin/clang
collect2: error: ld terminated with signal 9 [Killed]
tools/clang/tools/driver/CMakeFiles/clang.dir/build.make:222: recipe for target 'bin/clang-3.9' failed
make[2]: *** [bin/clang-3.9] Error 1
make[2]: *** Deleting file 'bin/clang-3.9'
CMakeFiles/Makefile2:10809: recipe for target 'tools/clang/tools/driver/CMakeFiles/clang.dir/all' failed
make[1]: *** [tools/clang/tools/driver/CMakeFiles/clang.dir/all] Error 2
Makefile:149: recipe for target 'all' failed
make: *** [all] Error 2
Build failed due to exception!
Working directory: /home/daiki/emsdk/clang/fastcomp/build_incoming_64
Command '['make', '-j1']' returned non-zero exit status 2
Installation failed!

	メモリが足りないらしい???
	8GBに増設
free.logCopied!
$ free
             total       used       free     shared    buffers     cached
Mem:       7679820     157468    7522352       8408      10856      45592
-/+ buffers/cache:     101020    7578800
Swap:            0          0          0

	$ sudo ./emsdk install sdk-incoming-64bit binaryen-master-64bit
		改めて実行していく

???
err.logCopied!
Scanning dependencies of target llc
[ 93%] Building CXX object tools/llc/CMakeFiles/llc.dir/llc.cpp.o
[ 93%] Linking CXX executable ../../bin/llc
collect2: error: ld returned 1 exit status
tools/llc/CMakeFiles/llc.dir/build.make:141: recipe for target 'bin/llc' failed
make[2]: *** [bin/llc] Error 1
CMakeFiles/Makefile2:12629: recipe for target 'tools/llc/CMakeFiles/llc.dir/all' failed
make[1]: *** [tools/llc/CMakeFiles/llc.dir/all] Error 2
Makefile:149: recipe for target 'all' failed
make: *** [all] Error 2
Build failed due to exception!
Working directory: /home/daiki/emsdk/clang/fastcomp/build_incoming_64
Command '['make', '-j1']' returned non-zero exit status 2
Installation failed!

	シェルに再ログインしたところ， No space left on device と出ていた． 
→ え，ディスク20GB でも足りないの??
df.logCopied!
$ df
Filesystem     1K-blocks     Used Available Use% Mounted on
/dev/sda1       20509288 20438540         0 100% /
udev               10240        0     10240   0% /dev
tmpfs            1535964     8404   1527560   1% /run
tmpfs            3839908        0   3839908   0% /dev/shm
tmpfs               5120        0      5120   0% /run/lock
tmpfs            3839908        0   3839908   0% /sys/fs/cgroup

	30GBにした
	$ sudo ./emsdk install sdk-incoming-64bit binaryen-master-64bit
		改めて実行していく

 clang-incoming-64bit 完了
log.logCopied!
[100%] Linking CXX executable ../../bin/llvm-link
[100%] Built target llvm-link
Done installing tool 'clang-incoming-64bit'.

 binaryen-master-64bit 完了
log.logCopied!
[100%] Linking CXX executable bin/wasm-shell
[100%] Built target wasm-shell
Done installing tool 'binaryen-master-64bit'.

次のステップ．
$ sudo ./emsdk activate sdk-incoming-64bit binaryen-master-64bit
log.logCopied!
Writing .emscripten configuration file to user home directory /root/
The Emscripten configuration file /root/.emscripten has been rewritten with the following contents:
import os
LLVM_ROOT='/home/daiki/emsdk/clang/fastcomp/build_incoming_64/bin'
NODE_JS='/home/daiki/emsdk/node/4.1.1_64bit/bin/node'
EMSCRIPTEN_ROOT='/home/daiki/emsdk/emscripten/incoming'
EMSCRIPTEN_NATIVE_OPTIMIZER='/home/daiki/emsdk/emscripten/incoming_64bit_optimizer/optimizer'
BINARYEN_ROOT='/home/daiki/emsdk/binaryen/master_64bit_binaryen'
SPIDERMONKEY_ENGINE = ''
V8_ENGINE = ''
TEMP_DIR = '/tmp'
COMPILER_ENGINE = NODE_JS
JS_ENGINES = [NODE_JS]
To conveniently access the selected set of tools from the command line, consider adding the following directories t
o PATH, or call 'source ./emsdk_env.sh' to do this for you.
   /home/daiki/emsdk:/home/daiki/emsdk/clang/fastcomp/build_incoming_64/bin:/home/daiki/emsdk/node/4.1.1_64bit/bin:
/home/daiki/emsdk/emscripten/incoming:/home/daiki/emsdk/binaryen/master

そして
$ source ./emsdk_env.sh
logCopied!
Adding directories to PATH:
PATH += /home/daiki/emsdk
Setting environment variables:
EMSDK = /home/daiki/emsdk
EM_CONFIG = /home/daiki/.emscripten

$ /home/daiki/emsdk/emscripten/incoming/emcc
logCopied!
/home/daiki/emsdk/emscripten/incoming/emcc --version
==============================================================================
Welcome to Emscripten!
This is the first time any of the Emscripten tools has been run.
A settings file has been copied to ~/.emscripten, at absolute path: /home/daiki/.emscripten
It contains our best guesses for the important paths, which are:
  LLVM_ROOT       = /usr/bin
  NODE_JS         = node
  EMSCRIPTEN_ROOT = /home/daiki/emsdk/emscripten/incoming
Please edit the file if any of those are incorrect.
This command will now exit. When you are done editing those paths, re-run it.
==============================================================================

$ sudo /home/daiki/emsdk/emscripten/incoming/emcc hello.c -s WASM=1 -o hello.html
	あとでパス通す
	デフォルトで通らなかったのか

1分くらい待った
logCopied!
INFO:root:generating system asset: is_vanilla.txt... (this will be cached in "/root/.emscripten_cache/is_vanilla.txt" for subsequent builds)
INFO:root: - ok
INFO:root:(Emscripten: Running sanity checks)
WARNING:root:java does not seem to exist, required for closure compiler, which is optional (define JAVA in /root/.emscripten if you want it)
WARNING:root:closure compiler will not be available
INFO:root:generating system library: libc.bc... (this will be cached in "/root/.emscripten_cache/asmjs/libc.bc" for subsequent builds)
INFO:root: - ok
INFO:root:generating system library: dlmalloc.bc... (this will be cached in "/root/.emscripten_cache/asmjs/dlmalloc.bc" for subsequent builds)
INFO:root: - ok
INFO:root:generating system library: wasm-libc.bc... (this will be cached in "/root/.emscripten_cache/asmjs/wasm-libc.bc" for subsequent builds)
INFO:root: - ok

lsすると，このようなファイル達ができていた
なんでこんなに色々と
 hello.asm.js  hello.c  hello.html  hello.js  hello.wasm 
ひとまずOKそう

	メモリ 8GB 高いので 4GB に下げたけど動くか?
		余裕でいけた
		ビルド時はメモリがたくさん必要

#WebAssembly #2017
Hello WebAssembly! 奮闘メモ

関連ページ
