meson bug?

gistfile1.txt

project(
    'test project',
    ['c'],
    version: 'v0.0.1',
)

e = executable(
    'some prog',
    [
        'source/app.c',
        'another_source/somesrc.c',
    ],
)

generates:

[1/3] cc '-Isome prog@exe' -I. -I.. -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -g -MD -MQ 'some prog@exe/source_app.c.o' -MF 'some prog@exe/source_app.c.o.d' -o 'some prog@exe/source_app.c.o' -c ../source/app.c
[2/3] cc '-Isome prog@exe' -I. -I.. -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -g -MD -MQ 'some prog@exe/another_source_somesrc.c.o' -MF 'some prog@exe/another_source_somesrc.c.o.d' -o 'some prog@exe/another_source_somesrc.c.o' -c ../another_source/somesrc.c
[3/3] cc  -o 'some prog' 'some prog@exe/source_app.c.o' 'some prog@exe/another_source_somesrc.c.o' -Wl,--as-needed -Wl,--no-undefined