.a/.o GResource problem

# CFLAGS and other irrelevant details were omitted

# Preparations
gcc -c -o main.o main.c
glib-compile-resources --target=foo-resources.c --generate-source --c-name foo foo.gresource.xml
gcc -c -o foo-resources.o foo-resources.c

# Works (can query the resources in the executable with "gresource" CLI tool and can access those in myprogram's code)
gcc -o myprogram main.o foo-resources.o

# Doesn't work (cannot see the resources in the executable)
ar rcs libfoo.a foo-resources.o
gcc -o myprogram main.o libfoo.a