how to set meson link dependency for buildin lib as "-lm -lrt"

on meson build, dependencies are resolved by pkg-config/cmake ...

but for system libs, no docs. I only find 2 of them:

• zlib stands for -lz
• threads stands for -lpthread

then how can I link -lm -lrt ?

• "m"
• "math"
• "libm"
• runtime

all guess fail.

ok, method found in doc:

cc = meson.get_compiler('c')
m_dep = cc.find_library('m', required : false)
executable("abc", dependencies : m_dep)

for common libs that's not good design. why not make it easy? such as:

m_dep = dependency('m', method : 'build-in')