emcc: cannot find library "dl"

[wolf188]

appear some error message when compile. for example,
emmake make
Scanning dependencies of target hello.html
[ 50%] Building CXX object CMakeFiles/hello.html.dir/src/main.cpp.o
[100%] Linking CXX executable hello.html
WARNING:root:emcc: cannot find library "dl"
warning: unresolved symbol: glfwWindowHint
[100%] Built target hello.html

[wolf188]

I can find the file of libdl.a at this directory. "/usr/lib/x86_64-redhat-linux6E/lib64"

[cpitclaudel]

You need an emscripten-compiled copy of that library (dl). Compile it separately, from source (with emscripten), and then add the appropriate flags to ./configure (presumably something like env CPPFLAGS="-I${YOUR_COMPILED_LIB's_ROOT}" LDFLAGS="-L${YOUR_COMPILED_LIB's_ROOT}/.libs" emconfigure ./configure.

[juj]

It is safe to ignore that link warning, since Emscripten implements dlopen() already in the core shipped libraries.

However there are some caveats. @kripken knows the details here the best. @kripken : would it make sense to add -ldl to the set of ignored core libraries? (at https://github.com/kripken/emscripten/blob/master/tools/shared.py#L1984 ?) Or does our support fundamentally differ in some ways from what libdl can offer?

[kripken]

Probably it makes sense to add to that list, we do have core dlopen functionality working. It has some limitations, but I don't think enough to justify not including it.

[wolf188]

https://github.com/wolf188/emscripten_project.git
The test project can not run . why ?? Who can help me ?
emmake make
Scanning dependencies of target hello.html
[ 50%] Building CXX object CMakeFiles/hello.html.dir/src/main.cpp.o
[100%] Linking CXX executable hello.html
warning: unresolved symbol: glfwWindowHint

[juj]

glfwWindowHint does seem to be present, but looks like it is part of GLFW 3 and requires -s USE_GLFW=3 linker flag set to enable GLFW 3 instead of the default GLFW 2. Perhaps that is the reason?

[stale]

This issue has been automatically marked as stale because there has been no activity in the past 2 years. It will be closed automatically if no further activity occurs in the next 7 days. Feel free to re-open at any time if this issue is still relevant.