In my Makefile I am using the -DDEBUG Flag for debugging which works fine (compiles and right output) in the following minimal example:
# Makefile
all : debug
CXX = g++
CXXFLAGS = -std=c++11 -Werror -Wall -Wextra -Wno-unused-value
SOURCES = main.cpp vector.cpp
OBJECTS = $(subst .cpp,.o, $(SOURCES))
debug: $(OBJECTS)
$(CXX) $(CXXFLAGS) -DDEBUG -o Program $(OBJECTS)
./Program
clean:
rm *.o Program
.PHONY: clean debug
But when i copy all project-files into the Folder the Debug-Flag wont be set (tested with #ifdef DEBUG and cout). I am adding the following files:
ind.hpp ind.cpp debug.hpp debug.cpp
I first thought debug.* could be the problem, but ".PHONY: clean debug" didn't help.
In the Makefile change this:
debug: $(OBJECTS)
$(CXX) $(CXXFLAGS) -DDEBUG -o Program $(OBJECTS)
to:
debug: $(SOURCES)
$(CXX) $(CXXFLAGS) -DDEBUG -o Program $(SOURCES)
The reason being that in the rule to build debug target you are just linking the object files and not compiling with -DDEBUG. With this change you should be able to compile with -DDEBUG flag.
Related
When I make the Makefile everything works fine, I get a library in the directory dir. And when I run "Make test" I get a testfile that I want to run. But when I want to run this file I get this weird error: ./programma: error while loading shared libraries: libprogramma.so: cannot open shared object file: No such file or directory. I have tried running the program on both WSL and Linux, but nothing makes this error go away. Can anyone help me?
Here I have my Makefile which makes the library and the executable:
INC_DIR = include
SRC_DIR = src
SOURCES = $(sort $(shell find $(SRC_DIR) -name '*.cc'))
OBJECTS = $(SOURCES:.cc=.o)
DEPS = $(OBJECTS:.o=.d)
TARGET = programma
CXX = g++
CFLAGS = -Wall -Wextra -Wpedantic -std=c++11
CPPFLAGS = $(addprefix -I, $(INC_DIR))
.PHONY: all clean debug release
release: CFLAGS += -O3 -DNDEBUG
release: all
debug: CFLAGS += -O0 -DDEBUG -ggdb3
debug: all
all: $(TARGET)
clean:
rm -f $(OBJECTS) $(DEPS) lib/*.so programma *.d
$(TARGET): $(OBJECTS)
$(CXX) $(CFLAGS) $(CPPFLAGS) -fPIC -shared -o lib/lib$#.so $^
-include $(DEPS)
%.o: %.cc
$(CXX) $(CFLAGS) $(CPPFLAGS) -fPIC -MMD -o $# -c $<
test:
$(CXX) $(CFLAGS) -L./lib $(CPPFLAGS) -MMD -o programma tests/main.cc -l$(TARGET)
Executables on Linux don't look for shared libraries in the directory they're located in, at least by default.
You can either fix that at link-time, by passing -Wl,-rpath='$ORIGIN', or at runtime, by setting LD_LIBRARY_PATH env variable to the directory with the library. (LD_LIBRARY_PATH=path/to/lib ./programma)
I have created Eclipse Makefile c++ project with intention to build project also without Eclipse. But I got error while run make in terminal:
Makefile:15: *** Build mode not supported by this Makefile. Stop.
How to fix that? Why I should need Eclipse Makefile if I can't build it with make?
Makefile content:
PROJECT_ROOT = $(dir $(abspath $(lastword $(MAKEFILE_LIST))))
OBJS = boiler.o
ifeq ($(BUILD_MODE),debug)
CFLAGS += -g
else ifeq ($(BUILD_MODE),profile)
CFLAGS += -O2
else ifeq ($(BUILD_MODE),run)
CFLAGS += -O2
else ifeq ($(BUILD_MODE),linuxtools)
CFLAGS += -g -pg -fprofile-arcs -ftest-coverage
LDFLAGS += -pg -fprofile-arcs -ftest-coverage
else
$(error Build mode $(BUILD_MODE) not supported by this Makefile)
endif
all: boiler
boiler: $(OBJS)
$(CXX) $(LDFLAGS) -o $# $^
%.o: $(PROJECT_ROOT)%.cpp
$(CXX) -c $(CFLAGS) $(CXXFLAGS) $(CPPFLAGS) -o $# $<
%.o: $(PROJECT_ROOT)%.c
$(CC) -c $(CFLAGS) $(CPPFLAGS) -o $# $<
clean:
rm -fr boiler $(OBJS)
I'm not sure exactly how you created your Makefile ...
... but the problem is clearly that your Makefile happens to rely on the variable "$(BUILD_MODE)" ...
... and, the way you're running "make", BUILD_MODE isn't being set to one of your options, or isn't being set at all.
SUGGESTION: Type this on the command line: make BUILD_MODE=debug
PS:
Equivalently, you could define BUILD_MODE as an environment variable, e.g. set BUILD_MODE=debug (DOS prompt) or export BUILD_MODE-debug (Linux term)
"BUILD_MODE" isn't "required". It's just a convention. That your "Makefile generator" happened to add when it created your particular makefile.
I am trying to build a Makefile that will build a shared library with g++ and I find that it is not evaluating the OBJECTS variable. This is on Ubuntu 18.04 and all the files are in the same current directory. Secondly it is completely skipping the source file compilation and proceeding directly to evaluate the linking instruction. As a clarification I am using GNU Make 4.1
Here is what I get when I type make all
g++ -shared -pthread -o tree.so
g++: fatal error: no input files
compilation terminated.
Makefile:12: recipe for target 'tree.so' failed
make: *** [tree.so] Error 1
Here is my Makefile code
CC=g++
CFLAGS = -I/usr/local/include -Wall -std=c++17 -O3 -march=native -Ofast -ftree-vectorize
LIBS=-shared -pthread
SOURCES=$(wildcard *.cpp)
OBJECTS=$(wildcard *.o)
TARGET=tree.so
all:$(TARGET)
$(TARGET) : $(OBJECTS)
$(CC) $(LIBS) -o $(OBJECTS) $(TARGET)
$(OBJECTS):$(SOURCES)
$(CC) -c -g $(CFLAGS) $(SOURCES)
clean:
rm -f $(OBJECTS) $(TARGET)
If you only have the *.cpp files in your directories, then there is not any *.o yet, so your $(wildcard *.o) will expand to nothing.
What you want is to get the *.cpp files and compute the corresponding *.o files:
OBJECTS=$(patsubst %.cpp,%.o,$(SOURCES))
or equivalently:
OBJECTS=$(SOURCES:.cpp=.o)
Now, your compiler command is not the best one, because if you touch any source file all will be compiled. You can use instead:
$(OBJECTS): %.o: %.cpp
$(CC) -c -g $(CFLAGS) $< -o $#
So that only the touched files are actually rebuilt.
Also you have the linking command wrong. It should be:
$(TARGET) : $(OBJECTS)
$(CC) $(LIBS) -o $(TARGET) $(OBJECTS)
because the argument to the -o option is the output file, that is the target.
I want to use a single make file to generate a project in multiple modes, and then each mode in a "normal" and "debug" mode, ie:
I have the following files (ofc more in reality, but this will serve to show my point):
kernel/core/main.cpp
kernel/processor/Processor.cpp
kernel/processor/x86/Processor.cpp
kernel/processor/x86_common/Processor.cpp
kernel/processor/x64/Processor.cpp
And i want to be able to use my makefile in the following ways:
make x86
(compiles all files except "kernel/processor/x64/Processor.cpp")
(enables the pre-processor directives X86 & X86_COMMON)
And,
make x86debug
(compiles all files except "kernel/processor/x64/Processor.cpp")
(enables the pre-processor directives X86 & X86_COMMON & DEBUG)
(puts "-g -ggdb" infront of all gcc/g++/as arguments)
And so on.
Currently i have the following makefile, which while it works, only lets me compile in x86-debug mode and now that i am porting my software to other platforms I wish to be able to specify what mode to build in.
CC = i586-elf-g++
CFLAGS = -g -ggdb -ffreestanding -Wall -Wextra -fno-exceptions -fno-rtti -std=gnu++11 -Isrc/system/include -DX86 -DX86_COMMON
LD = i586-elf-gcc
LDFLAGS = -g -ggdb -ffreestanding -O2 -nostdlib -lgcc
AS = i586-elf-as
ASFLAGS = -g -ggdb
OBJECTS = src/system/kernel/core/main.o
ALL_OBJECTS = $(OBJECTS) $(X86_OBJECTS)
X86COMMON_OBJECTS = src/system/kernel/core/processor/x86_common/Processor.o
X86_OBJECTS = $(X86COMMON_OBJECTS) src/system/kernel/core/processor/x86/boot.o
X86_LINKER = src/system/kernel/core/processor/x86/link.ld
X86_OUTPUT = bin/kernel_x86.bin
.PHONY: clean
clean: $(ALL_OBJECTS)
rm $(ALL_OBJECTS)
.PHONY: all
all: $(X86_OUTPUT)
$(X86_OUTPUT): $(X86_LINKER) $(OBJECTS) $(X86_OBJECTS)
$(LD) $(LDFLAGS) -T $(X86_LINKER) $^ -o $#
%.o: %.cpp
$(CC) $(CFLAGS) -c $< -o $#
%.o: %.asm
$(AS) $(ASFLAGS) $< -o $#
As you can probably tell, im not an expert with make so any help/ideas would be appreciated.
Remove -g from CFLAGS and LDFLAGS, and add the following PHONY:
.PHONY: x86_debug
x86_debug: CFLAGS += -g
x86_debug: LDFLAGS += -g
x86_debug: $(X86_OUTPUT)
To compile in normal mode: make.
To compile in debug mode: make x86_debug
It may not do exactly what you're expecting, but it's easy to modify
I have a makefile that can be reduced to this:
OBJS = obj1.o obj2.o
FLAGS = -Wall -Wextra -Werror -pedantic-errors -fno-rtti -std=c++0x
DEBUG_FLAGS = -ggdb -O0 -fstack-protector-all -D_GLIBCXX_DEBUG
RELEASE_FLAGS = -O3
release: $(OBJS)
g++ $(FLAGS) $(RELEASE_FLAGS) $(OBJS)
debug: $(OBJS)
g++ $(FLAGS) $(DEBUG_FLAGS) $(OBJS)
obj1.o: obj1.cpp
g++ -c $(FLAGS) obj1.cpp
obj2.o: obj2.cpp
g++ -c $(FLAGS) obj2.cpp
The problem is that all or none of the files must be built with the -D_GLIBCXX_DEBUG flag. I don't know how to do this without writing two entries for every compilation unit, like
obj1_release.o: obj1.cpp
g++ -c $(FLAGS) $(RELEASE_FLAGS) obj1.cpp
obj1_debug.o: obj1.cpp
g++ -c $(FLAGS) $(DEBUG_FLAGS) obj1.cpp
How can I make the -D_GLIBCXX_DEBUG flag (and the other debug flags) take effect for all compilation units only when the user types make debug without writing two entries for every CU? (And vice versa; the release flags need to take effect on all CUs when the user types make release.)
I apologise if this is the basics of writing Makefiles, I don't know much about them.
You are looking for pattern rules: something like this should do what you want. Note that this cannot be made to work correctly unless the debug and release versions of the program are given different names.
OBJS := obj1 obj2 obj3
R_OBJS := $(OBJS:=_r.o)
D_OBJS := $(OBJS:=_d.o)
all: prog_r prog_d
release: prog_r
debug: prog_d
prog_r: $(R_OBJS)
$(CXX) $(CXXFLAGS) $(RELEASE_FLAGS) $(LDFLAGS) $^ $(LIBS) -o $#
prog_d: $(D_OBJS)
$(CXX) $(CXXFLAGS) $(DEBUG_FLAGS) $(LDFLAGS) $^ $(LIBS) -o $#
%_r.o: %.cc
$(CXX) $(CXXFLAGS) $(RELEASE_FLAGS) -c $< -o $#
%_d.o: %.cc
$(CXX) $(CXXFLAGS) $(DEBUG_FLAGS) -c $< -o $#
# header files
obj1_d.o obj1_r.o: foo.h bar.h
obj2_d.o obj2_r.o: quux.h
# ... etc ...
There is a pretty straightforward way to select compilation flags based on the type of the build in Makefiles.
In addition to that you may like to ensure that debug build only links debug object files and same for release (i.e. no mixing debug and release object files). To achieve that compile object into different directories depending on the build type.
This might help : http://sunsite.ualberta.ca/Documentation/Gnu/make-3.79/html_chapter/make_7.html
You could check the first argument (debug/release) and set the CFLAGS accordingly.
HTH.