I'm working on completely eliminating recursion from our build system.
One problem I've come up with is having to run make twice to start
building anything. I've widdled down the makefile to the simplest
version that still works.
We link all the source files into one folder and do the build there.
The reason for this is long and complex but it's something we must maintain.
I'm guessing that the pattern substitution rule doesn't work unless the
files are linked before make is executed. So make has to be run once to
link all the files, and then again to start building. Here's my
example, omitting the obvious definitions:
-
include /obvious_definitions.mk
DIRS := $(BUILD_DIR)
BUILD_DIR := /build
CLUSTER_NAME := importers
EXEC_SRCS := import_e.cc
SRCS_LIST := /importers/import_e.cc
EXECS := $(EXEC_SRCS:.cc=)
DEP := $(SRCS:.cc=.d)
bin: links import_e
import_e: import_e.o
$(CXX) -o $@ $(FLAGS) $<
links: $(DIRS)
@ln -sf $(SRCS_LIST) $(BUILD_DIR)
$(DIRS):
@echo Creating install dir $@
@$(INSTALL) -d $@
%.o: %.cc
$(CXX) $(MAKEDEPFLAGS) -c $(FLAGS) $<
.PHONY: clean bin links
# Include dependencies
ifdef DEP
ifneq ($(MAKECMDGOALS),clean)
-include $(DEP)
endif
endif # DEP
-
When I execute the make command, either with an empty build directory or
no build directory, I get an error that there's no target for
import_e.o. If I run make twice, it's happy.
-
[user /build]$ make bin -n
ln -sf x /importers/import_e.cc /build
make: *** No rule to make target `import_e.o', needed by `import_e'. Stop.
[user /build]$ make bin
make: *** No rule to make target `import_e.o', needed by `import_e'. Stop.
[user /build]$ make bin
g++ -MD -c -g -I/include import_e.cc
-
Is there a solution to this that still allows me to link into and build
from a /build directory?
-
natch
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