Cannot open include file fmt/format.h

[Kaaserne]

add_requires("catch2 v2.13.10", "fmt >=7")

target("a")
    set_kind("headeronly")
    add_includedirs("include", { interface = true })
    add_packages("fmt")

target("a tests")
    set_kind("binary")
    add_files("tests/*.cpp")
    add_deps("a")
    -- add_packages("fmt") fixes the problem, but shouldn't, since target a already contains this
    add_packages("catch2")

package("cpp-lazy")
    set_description("A fast C++11/14/17/20 header only library for lazy evaluation and function tools")
    add_deps("cpp-lazy")

When building target a tests, a header file in target a generates the following error: fatal error C1083: Cannot open include file: 'fmt/format.h': No such file or directory. Adding add_packages("fmt") to target a tests solves the problem, but seems wrong.

[waruqi]

set {public = true} in target a

add_packages("fmt", {public = true})

[Kaaserne]

Is this something that was in the docs? Could not find it here

[waruqi]

https://xmake.io/#/manual/project_target?id=add-target-dependencies