I am having a hard time to compile for Web using Ubuntu

[celebisait]

I have been following this.

I have a fresh Ubuntu 20.04 LTS installation.

First I see we need emscripten. I have been following here to install.

(This is on an absolutely new Ubuntu installation on Google cloud)

$ git clone https://github.com/emscripten-core/emsdk.git
$ cd emsdk
$ ./emsdk install latest
$ ./emsdk activate latest
$ source ./emsdk_env.sh

I also add source "/home/celebisait_gmail_com/emsdk/emsdk_env.sh" to my ~/.bashrc.

Everything seems well until here.

I jump here to verify if everything is installed properly.

Looks like

$ emcc hello_world.c -o hello.html

works on a basic hello_world.c program.

Okay, we continue to raylib installation.

$ git clone https://github.com/raysan5/raylib.git

I add these to my .profile:

EMSDK_PATH=/home/celebisait_gmail_com/emsdk
EMSCRIPTEN_PATH=${EMSDK_PATH}/upstream/emscripten
CLANG_PATH=${EMSDK_PATH}/upstream/bin
PYTHON_PATH=/usr/bin/python3
NODE_PATH=${EMSDK_PATH}/node/12.9.1_64bit/bin
PATH=$PATH:${EMSDK_PATH}:${EMSCRIPTEN_PATH}:${CLANG_PATH}:${NODE_PATH}:${PYTHON_PATH}

Then I go to raylib/src and I do:

celebi@raylib-playground:~/raylib/src$ make PLATFORM=PLATFORM_WEB -B
emcc -c rcore.c -Wall -D_DEFAULT_SOURCE -DPLATFORM_WEB -DGRAPHICS_API_OPENGL_ES2 -Wno-missing-braces -Werror=pointer-arith -fno-strict-aliasing  -std=gnu99 -Os -I. -Iexternal/glfw/include -Iexternal/glfw/deps/mingw
make: emcc: Command not found
make: *** [Makefile:602: rcore.o] Error 127
celebi@raylib-playground:~/raylib/src$ emcc
emcc: error: no input files
celebi@raylib-playground:~/raylib/src$

I get emcc not found even though I obviously have emcc:

$ emcc
emcc: error: no input files

Any help would be appreciated.

[raysan5]

@celebisait it seems it could be some problem with the paths. I think emsdk includes some script to properly configure the paths: emsdk_env.sh. Also note that there are several emcc files (emcc, emcc.py, emcc.bat), maybe the system is not selecting the expected one to run?

[celebisait]

Yes, absolutely. I am already source ./emsdk_env.sh and also adding that to my ~/.profile file. Here is the output after I run that:

Adding directories to PATH:
PATH += /home/celebisait_gmail_com/emsdk
PATH += /home/celebisait_gmail_com/emsdk/upstream/emscripten
PATH += /home/celebisait_gmail_com/emsdk/node/14.15.5_64bit/bin

Setting environment variables:
PATH = /home/celebisait_gmail_com/emsdk:/home/celebisait_gmail_com/emsdk/upstream/emscripten:/home/celebisait_gmail_com/emsdk/node/14.15.5_64bit/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
EMSDK = /home/celebisait_gmail_com/emsdk
EM_CONFIG = /home/celebisait_gmail_com/emsdk/.emscripten
EMSDK_NODE = /home/celebisait_gmail_com/emsdk/node/14.15.5_64bit/bin/node
Setting environment variables:
PATH = /home/celebisait_gmail_com/emsdk:/home/celebisait_gmail_com/emsdk/upstream/emscripten:/home/celebisait_gmail_com/emsdk/node/14.15.5_64bit/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/usr/bin/python3

And it looks like to me emcc is installed properly, looking to this:

celebisait_gmail_com@raylib-playground:~/raylib/src$ emcc --check
emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 3.1.0 (8e1e305519e1027726a48861a1fec5662f7e18a2)
shared:INFO: (Emscripten: Running sanity checks)
celebisait_gmail_com@raylib-playground:~/raylib/src$ which emcc
/home/celebisait_gmail_com/emsdk/upstream/emscripten/emcc
celebisait_gmail_com@raylib-playground:~/raylib/src$ 

I don't have much experience with make, I wish we could use bazel here.

1. How does make calling emcc? If I can understand this better maybe we can fix it.
2. Should I try using CMake section instead?
3. Can anybody confirm that they were able to compile for Web using an Ubuntu instance recently?

As a side note: I thought having a fresh Ubuntu installation on cloud and following the installation docs very closely and carefully will lead me to success here, however, sadly, this wasn't the case.

[jamesl-github]

total guess, but try replacing
emcc
with
./emcc

from here
https://emscripten.org/docs/tools_reference/emcc.html

Command line syntax
emcc [options] file...
(Note that you will need ./emcc if you want to run emcc from your current directory.)

[celebisait]

@jamesl-github where do I change emcc? The issue is that I only get the error when I use make in raylib:

celebi@raylib-playground:~/raylib/src$ make PLATFORM=PLATFORM_WEB -B

emcc itself looks like working fine by itself.

[chriscamacho]

you need the path to emcc to be in your PATH env var too (looks like you just have emsdk in there)

[celebisait]

@chriscamacho thank you for the suggestion, I am trying to understand how I can actually address your comment.

So running emcc on a random directory, actually triggers emcc:

celebisait_gmail_com@raylib-playground:~/raylib/src$ emcc --version
emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 3.1.0 (8e1e305519e1027726a48861a1fec5662f7e18a2)
Copyright (C) 2014 the Emscripten authors (see AUTHORS.txt)
This is free and open source software under the MIT license.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

When I check where it does come from:

celebisait_gmail_com@raylib-playground:~/raylib/src$ which emcc
/home/celebisait_gmail_com/emsdk/upstream/emscripten/emcc

It is coming from /home/celebisait_gmail_com/emsdk/upstream/emscripten/ directory, which is in my PATH already:

celebisait_gmail_com@raylib-playground:~/raylib/src$ echo $PATH
/home/celebisait_gmail_com/emsdk:/home/celebisait_gmail_com/emsdk/upstream/emscripten:/home/celebisait_gmail_com/emsdk/node/14.15.5_64bit/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/usr/bin/python3

What exactly are you suggestion to add? Thank you.

[jamesl-github]

I was thinking you should try changing this
emcc -c rcore.c -Wall -D_DEFAULT_SOURCE -DPLATFORM_WEB -DGRAPHICS_API_OPENGL_ES2 -Wno-missing-braces -Werror=pointer-arith -fno-strict-aliasing -std=gnu99 -Os -I. -Iexternal/glfw/include -Iexternal/glfw/deps/mingw

to this
./emcc -c rcore.c -Wall -D_DEFAULT_SOURCE -DPLATFORM_WEB -DGRAPHICS_API_OPENGL_ES2 -Wno-missing-braces -Werror=pointer-arith -fno-strict-aliasing -std=gnu99 -Os -I. -Iexternal/glfw/include -Iexternal/glfw/deps/mingw

the only change being
emcc to ./emcc

[gtrxAC]

Seems like make on Ubuntu has a bug, I had this same issue with raylib and another project completely unrelated to raylib. I used make -e and it should find emcc and everything else just like running them from the command line normally.