Troubles with makefile

[VitalyP]

I am doing simple codegen with makefile. File gen.c is generated from
gensrc.c. The example below works correctly and gen.c is generated
when gensrc.c has more recent timestamp

test: gen.c
    gcc -o $@ $<

gen.c: gensrc.c
    # here goes some codegen command


However in the example below gen.c is generated even if gensrc.c is
older than gen.c. That is target 'prebuild' is always considered as
not up-to date. Why is it so?

.PHONY: prebuild

test: gen.c
    gcc -o $@ $<

gen.c: prebuild

prebuild: gensrc.c
    # here goes some codegen command


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