How can I run a script, which must execute before all other makefile commands? And it will be nice (but not mandatory) to the script is not executed if there is nothing to build.
I've searched SO and Google, but can't find anything.
I have this workaround:
# myscript.bat output is empty
CHEAT_ARGUMENT = (shell myscript.bat)
CFLAGS += -DCHEAT_ARGUMENT=$(CHEAT_ARGUMENT)
AFLAGS += -DCHEAT_ARGUMENT=$(CHEAT_ARGUMENT)
But it's very ugly. Is there other way to run "pre-build step" in makefile?
Answer
I propose two solutions. The first mimics what NetBeans IDE generates:
CC=gcc
.PHONY: all clean
all: post-build
pre-build:
@echo PRE
post-build: main-build
@echo POST
main-build: pre-build
@$(MAKE) --no-print-directory target
target: $(OBJS)
$(CC) -o $@ $(OBJS)
clean:
rm -f $(OBJS) target
The second one is inpired by what Eclipse IDE generates:
CC=gcc
.PHONY: all clean
.SECONDARY: main-build
all: pre-build main-build
pre-build:
@echo PRE
post-build:
@echo POST
main-build: target
target: $(OBJS)
$(CC) -o $@ $(OBJS)
@$(MAKE) --no-print-directory post-build
clean:
rm -f $(OBJS) target
Note that in the first one, pre and post builds are always called regardless of whether the main build is determined to be up to date or not.
In the second one, the post-build step is not executed if the state of the main build is up to date. While the pre-build step is always executed in both.