wrong include flag when using system llvm

[ilobilo]

Xmake Version

2.9.3

Operating System Version and Architecture

Fedora 40

Describe Bug

when using add_requires("llvm") and add_packages("llvm") in a target, during C++ module dependency scanning, xmake adds -isystem /usr/include to compiler flags (because llvm headers are located there), that causes the compilation to fail on both libstdcxx and libcxx. Example:

Expected Behavior

do not add -isystem /usr/include

Project Configuration

-- ...
add_requires("llvm", { system = true, kind = "library" })
-- ...
target("...")
-- ...
    add_packages("llvm")
-- ...

Additional Information and Error Logs

screenshots provided above

[waruqi]

you can set system = false to disable system library. or set external = false to use -I/usr/include instead of -isystem

[ilobilo]

external = false did the trick, thanks!