Alexander Egorenkov 49901079d4 common.mak: Introduce user-defined function check_header_prereq() ...

The new user-defined function allows to check for C headers in
make's conditional statements.

Example:

ifeq ($(call check_header_prereq,"systemd/sd-daemon.h"),yes)
  $(warning "systemd support enabled")
else
  $(warning "systemd support disabled")
endif

Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Acked-by: Jan Höppner <hoeppner@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

2021-07-07 13:49:57 +02:00

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