Enabling C++ module compilation causes linking errors

[ylingu]

Here is a minimal reproducible example of the issue:

add_rules("mode.debug", "mode.release")
set_languages("cxx23")
add_requires("opencv")

target("library")
    set_kind("shared")
    add_files("src/*.cc")
    add_files("src/*.cppm", {public = true})
    add_packages("opencv" {public = true}

target("main")
    add_files("*.cc")
    add_deps("library")

Enabling C++ module compilation (i.e., add_files("src/*.cppm", {public = true})) caused the compiled program to fail in linking against the OpenCV library installed via xmake, resulting in the following error.

After reviewing the source code, it was determined that the issue originates here. The issue was resolved after adding set_policy("build.c++.gcc.modules.cxx11abi", true) to the script.

[waruqi]

see #3855 (comment)