i am trying to write a make file to build and compile for different platforms ( the host machine and an arm board )
when i try to make main.o PLATFORM=HOST it gives me
make: Circular sources.mk.out <- sources.mk dependency dropped.
make: Circular Makefile.out <- Makefile dependency dropped.
my implemented makefile
ifeq ($(PLATFORM) ,MSP432)
# Architectures Specific Flags
LINKER_FILE =msp432p401r.lds
CPU = cortex-m4
ARCH = thumb
SPECS = nosys.specs
# Compiler Flags and Defines
CC =arm-none-eabi-gcc
LD = arm-none-eabi-ld
LDFLAGS = -Wl,-Map=$(TARGET).map -T $(LINKER_FILE)
CFLAGS =-march=armv7e-m -mfloat-abi=hard-mfpu=fpv4-sp-d16 -mcpu=$(CPU) -m$(ARCH) --specs=$(SPECS) -Wall -Werror -g -O0 -std=c99
else
# Architectures Specific Flags
# Compiler Flags and Defines
CC=gcc
LDFLAGS = -Wl,-Map=$(TARGET).map
LD = arm-none-eabi-ld
CFLAGS = -Wall -Werror -g -O0 -std=c99
endif
OBJS = $(SOURCES:.c=.o)
%.o : %.c
$(CC) -c $< $(CFLAGS) -D$(PLATFORM) $(INCLUDES) -o $#
$(TARGET).out: $(OBJS)
$(CC) $(OBJS) $(CFLAGS) $(LDFLAGS) $(CPPFLAGs) -o $#
can anyone spot the problem with the makefile ?
Related
I have a simple makefile on my machine:
# Compiler: g++ for C++ source files
CC = g++
# Compiler flags:
CFLAGS = -std=c++14 -Wall -Wextra -pedantic -O0 -c
foo.o: foo.cpp
$(CC) $(CFLAGS) $?
bar.o: bar.cpp
$(CC) $(CFLAGS) $?
foobar: foo.o bar.o
$(CC) -o $# $?
When I run make it remakes each target, even if it already exists. I want the makefile to ignore existing targets. What am I doing wrong?
Doing this fixed my problem:
# Compiler: g++ for C++ source files
CC = g++
# Compiler flags:
CFLAGS = -std=c++14 -Wall -Wextra -pedantic -O0 -c
all: foo.o bar.o foobar
foo.o: foo.cpp
$(CC) $(CFLAGS) $<
bar.o: bar.cpp
$(CC) $(CFLAGS) $<
foobar: foo.o bar.o
$(CC) -o $# $^
and also
touch makefile
I am using the following makefile to build my project:
CC = /usr/bin/g++
CFLAGS = -Wall -pedantic -std=c++0x
LDFLAGS =
OBJ = main.o pnmhandler.o pixmap.o color.o
pnm: $(OBJ)
$(CC) $(CFLAGS) -o pnm $(OBJ) $(LDFLAGS)
%.o: %.c
$(CC) $(CFLAGS) -c $<
As I run make I get the following error:
/usr/include/c++/4.9.1/bits/c++0x_warning.h:32:2: error: #error This
file requires compiler and library support for the ISO C++ 2011
standard. This support is currently experimental, and must be enabled
with the -std=c++11 or -std=gnu++11 compiler options.
As I can read from the following line, the CFLAGS are not properly included, but I have no idea what I am doing wrong:
g++ -c -o main.o main.cpp
Also tried -std=c++11 and -std=gnu++11, without any results. Any ideas?
If I run make -Bn, I get:
g++ -c -o main.o main.cpp
g++ -c -o pnmhandler.o pnmhandler.cpp
g++ -c -o pixmap.o pixmap.cpp
g++ -c -o color.o color.cpp
/usr/bin/g++ -Wall -pedantic -std=c++0x -o pnm main.o pnmhandler.o pixmap.o color.o
EDIT: Replacing the rule %.o: %.c with %.o: %.cpp fixes my problem.
The reason you see
g++ -c -o main.o main.cpp
is that Make is invoking its standard rule to create the object file:
%.o: %.cpp
# recipe to execute (built-in):
$(COMPILE.cpp) $(OUTPUT_OPTION) $<
The command expands to
$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c -o $# $<
Instead of setting CC and CFLAGS in your makefile, you should set CXX and CXXFLAGS, which are meant for C++ rather than C. That allows the built-in rule above to work for you, and then you just need to make sure the right linker is used, e.g. with
pnm: LINK.o=$(LINK.cc)
pnm: $(OBJ)
You also don't need the %.o: %.c rule, as you have no C sources.
Complete Makefile:
CXX = /usr/bin/g++
CXXFLAGS = -Wall -pedantic -std=c++0x
OBJ = main.o pnmhandler.o pixmap.o color.o
pnm: LINK.o=$(LINK.cc)
pnm: $(OBJ)
clean::
$(RM) pnm
.PHONY: clean
I am trying to make a makefile, which can make an exe for CppUTest. It can not find the headers, what have I done wrong? First time making a makefile, not 100% sure what I'm doing.
#The compiler to use
CC = g++
LINK = -g -pedantic -Wall -lstdc++ -lpthread -ldl -lm -Wl,-rpath,.
COMPILE = -g -O3 -D_THREAD_SAFE -pedantic -Wall -c -Wno-deprecated
#Name of the EXE file to create.
EXE = ./Tests
SRCS = $(shell ls *.cpp)
OBJS = $(subst .cpp,.o,$(SRCS))
#Extra flags to give to the C compiler.
CFLAGS =
#Libraries to include
LIBS= -lCppUTestExt -lCppUTest -lm
#Extra flags to give to the C++ compiler.
CXXFLAGS = -I/home/mg/DS-5-Workspace/Tests/include
#Extra flags to give to compilers when they are supposed to invoke the linker, ‘ld’,
#such as -L. Libraries (-lfoo) should be added to the LDLIBS variable
#instead.
LDFLAGS = -L/home/mg/DS-5-Workspace/Tests/cpputest/lib
#Extra flags to give to the C preprocessor and programs that use it (the C and
#Fortran compilers).
CPPFLAGS =
.SUFFIXES: .o .cpp
.cpp.o:
$(CC) $(CFLAGS) $(CXXFLAGS) $(LDFLAGS) $(COMPILE) $(LIBS) $<
all: $(OBJS)
$(CC) $(CFLAGS) $(CXXFLAGS) $(LDFLAGS) $(LIBS) $(OBJS) -o $(EXE) $(LINK)
-include depend.mak
depend:
g++ -MM $(SRCS) > depend.mak
#static:
#ar -crvs $(a) $(OBJS)
#shared: $(OBJS)
#$(CC) -shared -Wl,-soname -lc -o $(so) $(OBJS)
clean:
rm -rf $(OBJS) depend.mak $(EXE) $(so) $(a)
I have the following error:
error: CppUTest/CommandLineTestRunner.h: No such file or directory
Well, you're mixing up a lot of things.
Let's clean this up and keep only what is needed :
EXE := Tests
SRC_DIR := .
OBJ_DIR := obj
SRC := $(wildcard $(SRC_DIR)/*.cpp)
OBJ := $(SRC:$(SRC_DIR)/%.cpp=$(OBJ_DIR)/%.o)
CPPFLAGS := -I/home/mg/DS-5-Workspace/Tests/include
CPPFLAGS += -MMD -MP -D_THREAD_SAFE
CXXFLAGS := -W -Wall -Wno-deprecated -pedantic -O3 -g
LDFLAGS := -L/home/mg/DS-5-Workspace/Tests/cpputest/lib
LDFLAGS += -Wl,-rpath,.
LDLIBS := -lCppUTestExt -lCppUTest -lm -lstdc++ -lpthread -ldl
.PHONY: all clean fclean re
all: $(EXE)
clean:
$(RM) -f -r $(OBJ_DIR)
fclean: clean
$(RM) -f $(EXE)
re: fclean all
$(EXE): $(OBJ)
$(CXX) $(LDFLAGS) $^ $(LDLIBS) -o $#
# %.a: $(OBJ)
# $(AR) crvs $# $^
# ranlib $#
# %.so: CXXFLAGS += -fPIC
# %.so: $(OBJ)
# $(CXX) $(LDFLAGS) $^ $(LDLIBS) -o $#
$(OBJ_DIR):
#mkdir -p $#
$(OBJ_DIR)/%.o: $(SRC_DIR)/%.cpp | $(OBJ_DIR)
$(CXX) $(CPPFLAGS) $(CXXFLAGS) -o $# -c $<
-include $(OBJ:.o=.d)
Some explanations :
Avoid the $(shell ...) function, because it'll be executed each time the variable is called if assigned with the = operator instead of := operator.
$(CC) is a built-in variable containing cc or gcc (should be equivalent). Use the built-in $(CXX) to use g++.
-g, -pedantic, -O3, -Wno-deprecated and -Wall are compiler flags, they should be in the CFLAGS (for C) or CXXFLAGS (for C++) built-in variables.
-I <path> and -D_THREAD_SAFE are preprocessor flag, thus should be in the CPPFLAGS built-in variable.
-MMD -MP will auto-generate dependency files (.d extension) for each .o file. You can read more here.
.cpp.o: is a suffix rule, and suffix rules are the old-fashioned way of defining implicit rules for make. You should just rely upon these implicit rules make already know about or make your own the modern way.
You don't need to define .SUFFIXES: by yourself for such widely used targets. The variable SUFFIXES is defined to the default list of suffixes before make reads any makefiles. Make 3.82 defines these suffixes by default :
.SUFFIXES: .out .a .ln .o .c .cc .C .cpp .p .f .F .m .r .y .l .ym .yl .s .S .mod .sym .def .h .info .dvi .tex .texinfo .texi .txinfo .w .ch .web .sh .elc .el
If you have any questions, go on.
I am trying to create a very basic hand crafted Makefile to create a shared library to illustrate a point.
This is what I have so far:
SHELL = /bin/sh
CC = gcc
FLAGS = -std=gnu99 -Iinclude
CFLAGS = -fPIC -pedantic -Wall -Wextra -march=native -ggdb3
DEBUGFLAGS = -O0 -D _DEBUG
RELEASEFLAGS = -O2 -D NDEBUG -combine -fwhole-program
TARGET = example.so
SOURCES = $(shell echo src/*.c)
HEADERS = $(shell echo include/*.h)
OBJECTS = $(SOURCES:.c=.o)
PREFIX = $(DESTDIR)/usr/local
BINDIR = $(PREFIX)/bin
all: $(TARGET)
$(TARGET): $(OBJECTS)
$(CC) $(FLAGS) $(CFLAGS) $(DEBUGFLAGS) -o $(TARGET) $(OBJECTS)
When I run make, it attempts to build an application - and ld fails because it can't resolve main().
Problem seems to be with CFLAGS - I have specified -fPIC but that is not working - what am I doing wrong?
Edit
I added the -shared flag as suggested, when I run make, I got this error:
gcc -std=gnu99 -Iinclude -fPIC -shared -pedantic -Wall -Wextra -march=native -ggdb3 -O0 -D _DEBUG -o example.so src/example.o
/usr/bin/ld: src/example.o: relocation R_X86_64_32 against `.rodata' can not be used when making a shared object; recompile with -fPIC
src/example.o: could not read symbols: Bad value
collect2: ld returned 1 exit status
make: *** [example.so] Error 1
Which seems to be suggesting to revert back to -fPIC only.
BTW, my new CFLAGS setting is:
CFLAGS = -fPIC -shared -pedantic -Wall -Wextra -march=native -ggdb3
I am running gcc v4.4.3 on Ubuntu 10.0.4.
The solution was to modify the XXFLAGS as follows:
FLAGS = # -std=gnu99 -Iinclude
CFLAGS = -fPIC -g #-pedantic -Wall -Wextra -ggdb3
LDFLAGS = -shared
Compile with -shared:
gcc -o libfoo.so module1.o module2.o -shared
(This also works on MingW under Windows to produce DLLs.)
Example for C++ files. I've also included a clean target.
.PHONY : clean
CPPFLAGS= -fPIC -g
LDFLAGS= -shared
SOURCES = $(shell echo *.cpp)
HEADERS = $(shell echo *.h)
OBJECTS=$(SOURCES:.cpp=.o)
FIKSENGINE_LIBDIR=../../../../lib
FIKSENGINE_INCDIR=../../../../include
TARGET=$(FIKSENGINE_LIBDIR)/tinyxml.so
all: $(TARGET)
clean:
rm -f $(OBJECTS) $(TARGET)
$(TARGET) : $(OBJECTS)
$(CC) $(CPPFLAGS) $(OBJECTS) -o $# $(LDFLAGS)
Since you try to build so file, you probably need -shared.
this is my goto makefile rule for so files:
%.so: %.o ; $(LINK.c) $(LDFLAGS) -shared $^ -o $#
can be used like so
CFLAGS+=-fPIC
libmyfoo.so: # create from libmyfoo.o
# or
libmyfoo.so: myfoo.o # create from myfoo.o
I downloaded someone's source code for a program and i needed to make some changes.
Now i want to compile it but it doesn't seem to work.
PROGS = isotociso
COMMON = tools.o bn.o ec.o wiidisc.o rijndael.o
DEFINES = -DLARGE_FILES -D_FILE_OFFSET_BITS=64
LIBS = C:/Dev-Cpp/lib/libwsock32.a C:/Dev-Cpp/lib/libcrypto.a C:/Dev-Cpp/lib/libcomdlg32.a
CC = gcc
#CFLAGS = -Wall -W -Os -Ilibwbfs -I.
CFLAGS = -Wall -m32 -W -ggdb -Ilibwbfs -I.
LDFLAGS = -m32 -static
VPATH+=libwbfs
OBJS = $(patsubst %,%.o,$(PROGS)) $(COMMON)
all: $(PROGS)
$(PROGS): %: %.o $(COMMON) Makefile
$(CC) $(CFLAGS) $(LDFLAGS) $< $(COMMON) $(LIBS) -o $#
$(OBJS): %.o: %.c tools.h Makefile
$(CC) $(CFLAGS) $(DEFINES) -c $< -o $#
clean:
-rm -f $(OBJS) $(PROGS)
Output
C:\Users\Panda\Desktop\uloader_v4.1\src\isotociso\src>make
gcc -Wall -m32 -W -ggdb -Ilibwbfs -I. -DLARGE_FILES -D_FILE_OFFSET_BITS=64 -c i
sotociso.c -o isotociso.o
process_begin: CreateProcess((null), gcc -Wall -m32 -W -ggdb -Ilibwbfs -I. -DLAR
GE_FILES -D_FILE_OFFSET_BITS=64 -c isotociso.c -o isotociso.o, ...) failed.
make (e=2): The system cannot find the file specified.
make: *** [isotociso.o] Error 2
What would be the problem?
Looks to me as if gcc is not in your PATH.
It also looks like you need MinGW to get the libraries.
I am no expert in C(++) development under Windows, but my interpretation would be that it can't find the compiler itself. What development environment are you using?
It looks like it can't find a file. Are you sure you have all the required source files?