xmake-io Xmake Options
Options are user-facing switches that can be set via xmake f --name=value and queried from targets and conditions.
Declaring an option
option("enable_foo")
set_default(false)
set_showmenu(true)
set_description("Enable the foo subsystem")
option_end()
set_showmenu(true) makes the option visible in xmake f --menu and xmake f --help.
Using an option from a target
target("app")
add_files("src/*.cpp")
if has_config("enable_foo") then
add_files("src/foo/*.cpp")
add_defines("ENABLE_FOO=1")
end
has_config("name") returns true when the option is truthy. Use get_config("name") to read the actual value.
Enumerated / typed options
option("backend")
set_default("vulkan")
set_values("vulkan", "metal", "d3d12")
set_showmenu(true)
xmake f --backend=metal
Options that probe the host
option("has_avx2")
add_cxflags("-mavx2")
add_cxxincludes("immintrin.h")
add_cxxsnippets("int f(){ return _mm256_set1_epi32(1)[0]; }")
Xmake runs the snippet at configure time; the option becomes enabled if the probe compiles.
Generating a config header
target("app")
set_configdir("$(buildir)/config")
add_configfiles("src/config.h.in")
set_configvar("ENABLE_FOO", has_config("enable_foo") and 1 or 0)
src/config.h.in can reference ${define ENABLE_FOO} or ${ENABLE_FOO}.
Command-line usage
xmake f --enable_foo=y --backend=metal -m release
xmake
When to branch out
- Per-target flags —
xmake-targets - Toolchain selection via options —
xmake-toolchains