emsdk: new recipe #4

perseoGI · 2025-06-13T10:38:32Z

Summary

Original PR conan-io/conan-center-index#27213

CLAassistant · 2025-06-16T10:05:07Z

All committers have signed the CLA.

recipes/emsdk/all/conanfile.py

requirements.txt

.github/scripts/build_recipes.py

requirements.txt

conan_config/profiles/emsdk/asmjs

skhaz · 2025-07-01T18:21:04Z

Apologies for my ignorance, but how would the migration of my profile to WebAssembly work, as shown below?

$ cat ~/.conan2/profiles/webassembly
include(default)

[settings]
arch=wasm
os=Emscripten

[tool_requires]
*: emsdk/4.0.10

perseoGI · 2025-07-02T07:25:51Z

@skhaz no problem at all!

This would be a great wasm 32-bit profile:

[settings]
arch=wasm
build_type=Release
compiler=emcc
compiler.cppstd=17
compiler.libcxx=libc++
# Choose between both types of multithreading support (or none)
# compiler.threads=<posix|wasm_workers>
compiler.version=4.0.10
os=Emscripten

[tool_requires]
ninja/[*]
emsdk/4.0.10

[conf]
# Set Ninja as default generator as it is faster and will avoid Windows issues
tools.cmake.cmaketoolchain:generator=Ninja

Notice the usage of Ninja (if you are in windows, its crucial to avoid some compilation issues, and in general, Ninja is a better opcion over Makefile).

And the usage of compiler=emcc which is the new built-in native support compiler in conan.

In the docs you could find more information about other architectures such the experimental wasm64.
Or the explanation of why it is very important to declare the compirel.version. Remember in conan v2, the compiler.version setting is kind of syntactic sugar. It does not do anything but allowing conan to set some specific flags and what is most important, create different package IDs which will act as a result in incompatible binaries if merging two packages with different compiler version. This is crucial as emcc (the emscripten compiler) does not guarantee ANY ABI compatibility across versions!

I hope it helps!

.github/scripts/.ci_base_profile

.github/scripts/build_recipes.py

README.md

jcar87 · 2025-07-02T08:40:25Z

README.md

---
+## 🧰 Built-in Profiles
+
+This repository includes several **pre-configured Conan profiles** designed to make toolchain setup effortless:


Each "toolchain" should have a readme with tailored instructions - as I would expect this grow in the future.
I would refer to them as "reference" profiles - the ones we test, leaving it up to users to customise before installing. e.g. the "native" one still requires manual configuration, so I'm not sure that's effortless, there's still some use intervention needed in some instances.

we may consider having the profile .zip files as releases - so that a user can do conan config install https://github.com/xxxx/emsdk_profiles_1.0.zip or something like that - so that they get only what they need

In this line, another approach would be to have the profiles in a specific folder, under the emsdk folder. Let the users manually copy them, or if not, they can do a conan config install --source-folder to specify the specific folder. But better that than a single conan config install that will bring different profiles for emcc, cuda, etc, etc, of different unrelated things that users will not want in general

That is another good approach, right now, what I've done in the CI is the ability to publish recipe specific profiles manually with a github action, check out my fork releases: https://github.com/perseoGI/conan-toolchains/releases

This can be installed with:

$ conan config install https://github.com/perseoGI/conan-toolchains/releases/download/emsdk-4.0.10-profiles.zip/emsdk-4.0.10-profiles.zip

Allowing profile isolation with different recipes, and also, keeping a profile versioning.

Do you like this approach?

Seem a bit overkill to me, in terms of extra effort to publish and release the profiles, version them, etc.
One of the reasons of using the conan-toolchains repo is that it is not necessary to provide the same backward compatibility and previous versions support, and it is possible a more "live at head" approach. So such a strong effort towards versioning profiles seems very overkill to me.

conan_config/profiles/emsdk/.emsdk_base

jcar87 · 2025-07-02T09:01:14Z

conan_config/profiles/emsdk/native

@@ -0,0 +1,15 @@
+[platform_tool_requires]
+emsdk/4.0.10
+


The name "native" can be confusing because "native" usually means the "local cpu architecture".
I would probably go for another name.

This profile seems to assume that all these tools are discoverable in PATH, otherwise they won't work, other than perhaps in CMake.

Is there a case for adding a PATH in the [buildenv] section to point to the installation directory, in case it is not in the system PATH?

once again ,a README for this profiles may clarify these questions

conan_config/profiles/emsdk/wasm64

recipes/emsdk/all/conanfile.py

jcar87 · 2025-07-02T09:05:49Z

recipes/emsdk/all/test_package/conanfile.py

+    generators = "CMakeToolchain", "VirtualBuildEnv"
+
+    def build_requirements(self):
+        self.tool_requires(self.tested_reference_str)


I would probably have a test_package that is a regular requires and tests the post-conditions (e.g. checking emcc is called, etc)

and a separate, standalone "sample" project that is tested with the profiles in the profiles/emsdk folder instead. That way we test all the profiles

skhaz · 2025-07-02T14:25:12Z

Thank you so much @perseoGI.

Sorry bugging you again, I am just trying to help.

Do you know if do I need some extra setup?

ERROR: Package 'emsdk/4.0.10' not resolved: Unable to find 'emsdk/4.0.10' in remotes.

Ot it is not published yet?

cat ~/.conan2/profiles/default
[settings]
arch=armv8
build_type=Release
compiler=apple-clang
compiler.cppstd=gnu17
compiler.libcxx=libc++
compiler.version=17
os=Macos

[replace_tool_requires]
meson/*: meson/[*]
pkgconf/*: pkgconf/[*]

[tool_requires]
!cmake/*: cmake/[>=3 <4]

[conf]
tools.cmake.cmaketoolchain:generator=Ninja

cat ~/.conan2/profiles/webassembly
include(default)

[tool_requires]
ninja/[*]
emsdk/4.0.10

[settings]
arch=wasm
build_type=Release
compiler=emcc
compiler.cppstd=17
compiler.libcxx=libc++
compiler.version=4.0.10
os=Emscripten

jcar87 · 2025-07-02T14:55:24Z

Thank you so much @perseoGI.

Sorry bugging you again, I am just trying to help.

Do you know if do I need some extra setup?

ERROR: Package 'emsdk/4.0.10' not resolved: Unable to find 'emsdk/4.0.10' in remotes.

Ot it is not published yet?

cat ~/.conan2/profiles/default
[settings]
arch=armv8
build_type=Release
compiler=apple-clang
compiler.cppstd=gnu17
compiler.libcxx=libc++
compiler.version=17
os=Macos

[replace_tool_requires]
meson/*: meson/[*]
pkgconf/*: pkgconf/[*]

[tool_requires]
!cmake/*: cmake/[>=3 <4]

[conf]
tools.cmake.cmaketoolchain:generator=Ninja

cat ~/.conan2/profiles/webassembly
include(default)

[tool_requires]
ninja/[*]
emsdk/4.0.10

[settings]
arch=wasm
build_type=Release
compiler=emcc
compiler.cppstd=17
compiler.libcxx=libc++
compiler.version=4.0.10
os=Emscripten

Hi @skhaz

For the time being - this new repo will be available as a local recipes index and not published to Conan Center - we want the focus of Conan Center to remain on libraries, and treat these (there will be more!) as a separate case - eventually we may make the recipes available in a remote.

You'd have to follow these instructions: https://github.com/perseoGI/conan-toolchains/tree/pgi/new/emsdk, however since it has not been merged, you have to do the following:

git clone https://github.com/perseoGI/conan-toolchains.git -b pgi/new/emsdk
conan remote add conan-toolchains ./conan-toolchains

For the recipe to be available.

skhaz · 2025-07-02T14:57:49Z

My bad, thank you so much.

…en.cmake

paulocoutinhox · 2025-08-30T00:21:38Z

+1

memsharded

I have reviewed the emsdk recipe part mostly, and there are a couple of comments to check, but overall looks good.

For the CI part, I haven't seen any important issues, so looking good to me too. Not sure if some of the comments of @jcar87 are pending to check.

memsharded · 2025-09-01T14:00:04Z

recipes/emsdk/all/conanfile.py

+        env.define_path("EMSCRIPTEN", self._emscripten)
+        env.define_path("EM_CONFIG", self._em_config)
+        env.define_path("EM_CACHE", self._em_cache)
+        env.vars(self, scope="emsdk").save_script("emsdk_env_file")


It is not very clear who is using this file in this scope.

It is also confusing that the PATHs of this file are pointing to the package_folder/something paths, that doesn't really exist when the build() method runs, and it might even not be defined with package_folder=None for local conan build or conan install operations.

memsharded · 2025-09-08T12:40:59Z

recipes/emsdk/all/test_example/CMakeLists.txt

@@ -0,0 +1,4 @@
+cmake_minimum_required(VERSION 3.15)


It is unclear how this test_example uses emsdk, it looks like a regular C++ executable application?

Yes, this is a very basic test_example application which does nothing with Emsdk.
I could complicate the code.
Right now, the deep examples of usage of this toolchain are in conan-examples2

Maybe we could move those examples here, but it might be preferable to keep this repository as simple as possible.

Yes, if this doesn't have any clear instructions how to use this and run it in the browser or something like that, better follow up on the examples2 repo.

emsdk: added new recipe

695ba52

perseoGI assigned jcar87 and unassigned jcar87 Jun 16, 2025

AbrilRBS self-requested a review June 16, 2025 09:43

Merge branch 'main' into pgi/new/emsdk

ac1c0d2

AbrilRBS reviewed Jun 16, 2025

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recipes/emsdk/all/conanfile.py Show resolved Hide resolved

czoido and others added 12 commits June 16, 2025 14:54

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wip

4c44611

Removed requirements

e62adda

try to fix output

334f376

Updated profiles, readme and ci

48823f6

Updated CI, build only changed recipes

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Updated readme

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czoido reviewed Jun 17, 2025

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perseoGI marked this pull request as ready for review June 17, 2025 09:37

czoido approved these changes Jun 17, 2025

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jcar87 reviewed Jun 19, 2025

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perseoGI added 3 commits June 19, 2025 16:28

Moved general config to base CI profile

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Fix error

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Fix error

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perseoGI mentioned this pull request Jun 24, 2025

[feature] Add wasm64 arch conan-io/conan#17693

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1 task

Added user_toolchain example on native profile

44f11d9

This was referenced Jun 24, 2025

[bug] emscripten minimal example for embind fails when compiled with conan conan-io/conan#11051

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[feature] Emscripten os.threads setting conan-io/conan#10088

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czoido reviewed Jul 1, 2025

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Update requirements.txt

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czoido reviewed Jul 1, 2025

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Removed asmjs profile

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perseoGI mentioned this pull request Jul 1, 2025

Cross compiling from macOS to Emscripten fails because of automatically added -stdlib=libc++ conan-io/conan#7339

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jcar87 reviewed Jul 2, 2025

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Applied some review suggestions

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perseoGI added 2 commits July 3, 2025 10:07

Removed unneded builddirs environment as already included by Emscript…

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…en.cmake

Removed auto install conf in profile

073931e

This was referenced Jul 3, 2025

[question] How to use emsdk? conan-io/conan-center-index#14209

Closed

sol/optional_implementation.hpp:2194:10: error: no member named 'construct' in 'optional<type-parameter-0-0 &>' conan-io/conan-center-index#26195

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perseoGI added 9 commits July 4, 2025 13:01

Restored original test_package and created test_example

64ef64c

Fix ci

b1fe0cb

Testing publish profiles workflow

6e335fb

WIP

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WIP

a5ed161

Publish profiles

c6aae81

Publish profiles

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Publish profiles

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Publish profiles

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perseoGI mentioned this pull request Jul 8, 2025

libvpx: added emcc compiler to support WASM builds conan-io/conan-center-index#27880

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Removed support for multi versions in CI

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memsharded reviewed Sep 1, 2025

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emsdk: new recipe #4

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emsdk: new recipe #4

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skhaz commented Jul 1, 2025

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skhaz commented Jul 2, 2025

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perseoGI commented Jun 13, 2025 •

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