Compiling corrade and magnum separately for web-assembly

[sunayana]

Hello,

I am having problems installing magnum separately for web-assembly, these are the steps I took :

1. Installed corrade successully with emscripten from corrade/build-emscripten/ using the following command:

cmake .. -DCMAKE_TOOLCHAIN_FILE="../toolchains/generic/Emscripten-wasm.cmake" -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/lib/emscripten/system
cmake --build .
cmake --build . --target install

2. While trying to install magnum from magnum/build-emscripten/ directory using the following set of commands:
   cmake .. -DCMAKE_TOOLCHAIN_FILE="../toolchains/generic/Emscripten-wasm.cmake" -DCMAKE_BUILD_TYPE=Release -DCMAKE_PREFIX_PATH=/usr/lib/emscripten/system/ -DCMAKE_INSTALL_PREFIX=/usr/lib/emscripten/system/ -DMAGNUM_DEPLOY_PREFIX=/srv/http/magnum

I get the following error:

CMake Error at /usr/local/share/cmake-3.12/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
  Could NOT find Corrade (missing: CORRADE_INCLUDE_DIR
  _CORRADE_CONFIGURE_FILE)
Call Stack (most recent call first):
  /usr/local/share/cmake-3.12/Modules/FindPackageHandleStandardArgs.cmake:378 (_FPHSA_FAILURE_MESSAGE)
  modules/FindCorrade.cmake:281 (find_package_handle_standard_args)
  CMakeLists.txt:60 (find_package)


-- Configuring incomplete, errors occurred!

Although corrade has been successfully installed. Could you point out if I have missed something while trying to install corrade and magnum separately.

Thanks
Sunayana

[mosra]

Hi,

can you try pointing CMAKE_FIND_ROOT_PATH to your install location as well? Like this:

cmake .. \
    -DCMAKE_TOOLCHAIN_FILE="../toolchains/generic/Emscripten-wasm.cmake" \
    -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_PREFIX_PATH=/usr/lib/emscripten/system/ \
    -DCMAKE_INSTALL_PREFIX=/usr/lib/emscripten/system/ \
    -DCMAKE_FIND_ROOT_PATH=/usr/lib/emscripten/system/ \
    -DMAGNUM_DEPLOY_PREFIX=/srv/http/magnum

I am not exactly sure why is this happening (sometimes it's needed, sometimes not). I need to investigate and invent a fix so this is not needed, but at the moment this should hopefully do the trick.

Sometimes just rerunning CMake for the second time works too ¯\_(ツ)_/¯.

[sunayana]

Hello,

That worked, thank you very much :)

[mosra]

The toolchain is fixed to no longer require an explicit CMAKE_PREFIX_PATH in mosra/toolchains@cbd9843 (all submodules in Magnum projects are updated to use it). Should hopefully fix the above case as well.