Emconfigure pkg-config 依赖项未解决 / Emscripten

Question

Tying to compile a project using Emscripten with a CMakeList and pkg-config tool

Problem : dependencies using pkg-config are unresolved

Using :

cmake .

Works prefectly.

Using emscripten :

emconfigure cmake .

The dependencies of the project are unresolved for some reasons.

Been investigating and found out Emscripten is using his own pkg-config search path to resolved dependencies / using emconfigure :

emconfigure pkg-config --list-all

Does not list all the libs available through the classic =>

pkg-config --list-all

I'm probably missing something there.

Is there a way of forcing emscripten to use the global pkg-config system ?

Edit : Is it needed to compile dependencies first into Emscripten ?

Answer 1

I came across a similar issue where a library I was using was calling pkg_check_modules(GSL gsl) . I was able to fix issues with eg find_package(DoubleConversion REQUIRED) by providing cmake args

-DDoubleConversion_LIBRARY:FILEPATH=/home/myuser/code/double-conversion/libdouble-conversion.a -DDoubleConversion_INCLUDE_DIR:PATH=/home/myuser/code/double-conversion/double-conversion

to the cmake call but when I tried to do something similar with the GSL libraries, defining GSL_INCLUDE_DIR and GSL_LIBRARY they couldn't be found and I got errors about headers missing in the make call.

What I realized from the docs for PKG_CONFIG_USE_CMAKE_PREFIX_PATH is that (theoretically) if I just use a single arg -DCMAKE_PREFIX_PATH="${LIBS_DIR}/double-conversion;${LIBS_DIR}/gsl" then I shouldn't have to find the library path and include path for each library and I don't need to care whether the packages were found using find_package or pkg_check_modules. However, it does not seem to be a working replacement for the args I used for DoubleConversion nor does it provide me with a way of telling pkg_check_modules where to look for me GSL library. Perhaps cmake is too opinionated in where it expects include headers and libs.