Makefile with Dynamic Output Directory Based on Source File Directory
Date : March 29 2020, 07:55 AM
like below fixes the issue I'm trying to create a Makefile using a monorepo and am struggling a bit with dynamic output directories based on the source files' directories. , Something like this should do the job: # Directories
PKGS_ROOT := packages
PKGS_SRCDIR := src
PKGS_OUTDIR := lib
# Expands to the source directory for the specified package
pkg-srcdir = $(PKGS_ROOT)/$1/$(PKGS_SRCDIR)
# Expands to the output directory for the specified package
pkg-libdir = $(PKGS_ROOT)/$1/$(PKGS_OUTDIR)
# Expands to all output targets for the specified package
pkg-libs = $(addprefix $(call pkg-libdir,$1)/,$(notdir $(wildcard $(call pkg-srcdir,$1)/*.js)))
# Defines the following rules for the specified package:
# - build rule for .js files
# - rule to create the output directory if missing
# - package rule to build all outputs
# - clean-package rule to remove the output directory
# Adds the following prerequisites:
# - package target to 'all' rule
# - clean-package target to 'clean' rule
define pkg-rules
$(call pkg-libdir,$1)/%.js: $(call pkg-srcdir,$1)/%.js | $(call pkg-libdir,$1)
@echo Making $$@ from $$^
@cp $$^ $$@
$(call pkg-libdir,$1):
@mkdir $$@
$1: $(call pkg-libs,$1)
clean-$1:
rm -rf $(call pkg-libdir,$1)
all: $1
clean: clean-$1
.PHONY: $1 clean-$1
endef
# Creates rules for the specified package
add-pkg = $(eval $(call pkg-rules,$1))
# Create rules for all packages
PKGS := $(notdir $(wildcard $(PKGS_ROOT)/*))
$(foreach p,$(PKGS),$(call add-pkg,$p))
# Will be filled in by pkg-rules
.PHONY: all clean
.DEFAULT_GOAL := all
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makefile fatal error: no such file or directory, but the file is in current directory
Date : March 29 2020, 07:55 AM
help you fix your problem Your makefile looks fine. The basic structure of a makefile contains this pattern: <build object> : <list of dependencies>
command to execute to build the object if dependencies have changed
...
command to execute to build the object if dependencies have changed
#include <lib.c>
#include "lib.h"
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Makefile from one source Directory trying to access a cpp file from other Directory
Date : March 29 2020, 07:55 AM
around this issue Adding vpath %.cpp ../hello along with @gaoithe's solution has solved this issue. vpath %.cpp ../hello
GCC=g++
CPPFLAGS=-c -Wall
LDFLAGS=
OBJDIR=objdir
OBJ=$(addprefix $(OBJDIR)/, $(patsubst %.cpp, %.o, $(wildcard *.cpp)))
OBJ+=$(addprefix $(OBJDIR)/, $(patsubst %.cpp, %.o, $(notdir $(wildcard ../hello/*.cpp))))
TARGET=HelloWorld
.PHONY: all clean
all: $(OBJDIR) $(TARGET)
$(OBJDIR):
mkdir $(OBJDIR)
$(OBJDIR)/%.o: %.cpp
$(GCC) $(CPPFLAGS) -c $< -o $@
$(TARGET): $(OBJ)
$(GCC) $(LDFLAGS) -o $@ $^
clean:
@rm -f $(TARGET) $(wildcard *.o)
@rm -rf $(OBJDIR)
$ ls objdir/
Hello.o main.o World.o
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Update file (overwrite) file if file in other directory has changed. Simple Makefile
Date : March 29 2020, 07:55 AM
hope this fix your issue I have a file dir/a.txt which is updated occasionally. When I run make I need to update a file in the current directory a.txt such that it is overwritten with dir/a.txt if the latter has changed. I tried this , You do it like this: .PHONY: all
all: a.txt
a.txt: dir/a.txt
cp $< $@
cp dir/a.txt a.txt
.PHONY: all
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Why is the makefile returning g++: error: h file or directory make: *** [Makefile:12: test] Error 1?
Tag : cpp , By : user157654
Date : March 29 2020, 07:55 AM
To fix this issue The problem is that $^ and $@ is not working as you expected. $@ and $^ return the left and right values of $OBJ. However $OBJ simply resolves to "test.o". OBJ = $(SRC:.cpp=.o) # converts test.cpp to test.o
CXX = g++
CXXFLAGS = -c -Wall -Wextra -Werror
LDFLAGS = -lgmp -lsodium -lssl -lcrypto -lgmpxx
SRC = $(wildcard *.cpp )
HDR = $(wildcard *.h )
OBJ = $(SRC) $(SRC :.cpp =.o )
all : Release
Debug : CXXFLAGS +=-g
Debug : test
Release : test
test : $(OBJ)
$(CXX) -o $@ $^ $(LDFLAGS)
%.o : %.cpp $(HDR)
$(CXX) $(CXXFLAGS) $< -o $@
clean :
rm -f $(OBJ) test
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