CODEWITHSUNDEEP
gnu-make
dls
dls

Reputation: 4146

GNU make preprequisite execution order

Say I have the following GNU make targets:

    create_dir: 
        @mkdir objects

    build_asm: $(ASM_FILES)
        @echo building assembly files...

    build_c: $(C_FILES)
        @echo building c files...

I have a generic rule for creation of object files from .asm or .c files. I want to combine these into a single target as follows...

all: create_dir build_asm build_c
    @echo build complete

...and I want to build this target using the jobs using multiple jobs to increase performance. The *.c and *.s files should be placed in the directory created by build_c, so allowing make to execute them in any order is problematic.

Is there a way to force make to resolve the phony target create_dir before resolving build_c and build_asm without breaking up the target?

Upvotes: 2

Views: 1325

Answers (1)

Martin R
Martin R

Reputation: 539685

Creating an objects directory is a typical use case of "order-only-prerequisites" (see Types of Prerequisites in the GNU make manual):

create_dir: 
    @mkdir objects

build_asm: $(ASM_FILES) | create_dir
    @echo building assembly files...

build_c: $(C_FILES) | create_dir
    @echo building c files...

all: build_asm build_c
    @echo build complete

Upvotes: 3

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