I am having issues getting my Makefile to compile a very simple main function, and I can't seem to find the issue. Here is my Makefile:
main: main.o Recursion.o
gcc -Wall -o main main.o Recursion.o
main.o: main.c Recursion.c
gcc -Wall -c main.c
Recursion.o: Recursion.c Recursion.h
gcc -Wall -c Recursion.c
clean:
rm main *.o
When I enter the make command in the UNIX terminal, this is the result I get:
-bash-4.2$ make
cc -c -o main.o main.c
cc -c -o Recursion.o Recursion.c
gcc -Wall -o main main.o Recursion.o
main.o: main.c Recursion.c
make: main.o:: Command not found
make: *** [Makefile:3: main] Error 127
-bash-4.2$
I cannot figure out what's wrong. It is generating the executable main, but I'm not sure what exactly the issue is on the command line. Any suggestions?
Makefiles are indentation-sensitive.
Try this:
main: main.o Recursion.o
gcc -Wall -o main main.o Recursion.o
main.o: main.c Recursion.c
gcc -Wall -c main.c
Recursion.o: Recursion.c Recursion.h
gcc -Wall -c Recursion.c
clean:
rm main *.o
Related
I'm trying to link a static library archive file (libx/libx.a) with a C code. The library requires 2 flags (-lx -lpthread). After linking the static library my ultimate goal is to create a shared library. I have the following Make file,
rsa-engine: rsa/rsa.c rsa/bignum.c rsa/aes.c rsa/x509parse.c rsa/pem.c
gcc -fPIC -o rsa/rsa.o -c rsa/rsa.c
gcc -fPIC -o rsa/bignum.o -c rsa/bignum.c
gcc -fPIC -o rsa/aes.o -c rsa/aes.c
gcc -fPIC -o rsa/x509parse.o -c rsa/x509parse.c
gcc -fPIC -o rsa/pem.o -c rsa/pem.c
gcc -fPIC rsa-engine.c libx/libx.a -L.libx/ -lx -lpthread -o rsa-engine.o
gcc -shared -o librsa_engine.so -lcrypto rsa-engine.o rsa/rsa.o rsa/bignum.o rsa/aes.o rsa/x509parse.o rsa/pem.o
clean:
rm -f *.o rsa/*.o *.so rsa-engine
After using the make command it produces the following output,
/usr/bin/ld: cannot find -lx
collect2: error: ld returned 1 exit status
Makefile:2: recipe for target 'rsa-engine' failed
make: *** [rsa-engine] Error 1
I found similar questions here. But that did not help. Seems like I can't make the link work. Any help with what I'm doing wrong?
I would like to achieve the same result generated by the following command,
CC := gcc
CFLAGS := -Wall -g -MD -O2 -I ../
LDFLAGS := -lx -lpthread
tests_files := hello
all: $(tests_files)
hello: hello.o ../libx/libx.a
$(CC) $(CFLAGS) -static $(<) -L../libx/ $(LDFLAGS) -o $(#)
It seems that your libx.a is located in libx, yet -L references .libx directory. Anyway, since you reference libx/libx.a directly, you may skip both -L.libx/ -lx and it should link just fine.
I want to add -std=c++11 to my makefile but I do not Where to add, here is my code:
hw07: test.o functions.o
g++ test.o functions.o -o hw07
test.o: test.cpp headerfile.h
g++ -c test.cpp
functions.o: functions.cpp headerfile.h
g++ -c functions.cpp
clean:
rm *.o hw07
in the above code where should I add the stdc++11 code, please help me out about...
Instead of spelling out all of the rules and all of the commands, use variables and implicit rules to build your program:
CXXFLAGS = -std=c++11
hw07: test.o functions.o
test.o: test.cpp headerfile.h
functions.o: functions.cpp headerfile.h
clean:
rm *.o hw07
This will have make build the object files using $(CXXFLAGS) as the options to pass to the compiler. Then make will build the program hw07 using the files listed in its dependencies.
Other flags that are good to have when compiling the source files are -Wall and -Wextra. Those enable more warning messages from the compiler, that in almost all cases point out suspect things that could lead to problems.
You can just add -std=c++11 after each g++:
hw07: test.o functions.o
g++ -std=c+++11 test.o functions.o -o hw07
test.o: test.cpp headerfile.h
g++ -std=c+++11 -c test.cpp
functions.o: functions.cpp headerfile.h
g++ -std=c+++11 -c functions.cpp
clean:
rm *.o hw07
Also you can use a variable:
CPP_FLAGS='-std=c++11'
hw07: test.o functions.o
g++ ${CPP_FLAGS} test.o functions.o -o hw07
test.o: test.cpp headerfile.h
g++ ${CPP_FLAGS} -c test.cpp
functions.o: functions.cpp headerfile.h
g++ ${CPP_FLAGS} -c functions.cpp
clean:
rm *.o hw07
I have got 4 files: pass1.c , pass2.c, main.c and header1.h.
Each of these files, include the file header.h
I wrote the following makefile:
assembler: pass1.o pass2.o main.o
gcc pass1.o pass2.o -o assembler
pass1.o: pass1.c
gcc -c -ansi -Wall -pedantic pass1.c -o pass1.o
pass2.o: pass2.c
gcc -c -ansi -Wall -pedantic pass2.c -o pass2.o
main.o: main.c
gcc -c -ansi -Wall -pedantic main.c -o main.o
When I did make, I got the following error:
/usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu/Scrt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status
makefile:2: recipe for target 'assembler' failed
make: *** [assembler] Error 1
Note that I didn't write a function called 'start'.
What is the problem here and how can I fix it?
gcc pass1.o pass2.o -o assembler
should be
gcc main.o pass1.o pass2.o -o assembler
Rename main.c to assembler.c and your entire makefile can be condensed to
CFLAGS := -ansi -Wall -pedantic
objects := assembler.o pass1.o pass2.o
assembler: $(objects)
$(objects): header.h
assuming that cc on your system is a symlink to gcc.
This is the makefile:
all: main
main: main.o sum/sum.o sum/add/add.o utils/utils.o
gcc -Wall main.o sum/sum.o sum/add/add.o utils/utils.o -o main
main.o: main.c utils/utils.h sum/sum.h
gcc -Wall -c main.c
sum/sum.o: sum/sum.c sum/sum.h add/add.h
gcc -Wall -c sum/sum.c
sum/add/add.o: sum/add/add.c add.h
gcc -Wall -c sum/add/add.c
utils/utils.o: utils/utils.c
gcc -Wall -c utils/utils.c
clean:
rm -f main main.o sum/sum.o sum/add/add.o utils/utils.o *~
When I run make all in bash, I get errors like:
-make: *** No rule to make target `add.h', needed by `sum/sum.o'. Stop.
-make: *** No rule to make target `sum.c', needed by `sum/sum.o'. Stop.
And I have a directory where everything is:
.:
main.c main.o Makefile sum utils
./sum:
add sum.c sum.h
./sum/add:
add.c add.h
./utils:
utils.c utils.h
Where did I go wrong?
I've been trying to compile some language (CISC) that my professor created which is pseudo assembly. He wanted us to make a makefile and compile the file with .asm extension using gcc.
This is the makefile:
.SUFFIXES: .asm
all:schemeCompiler
schemeCompiler:target.o
gcc -g -m32 -Wall -o schemeCompiler target.o
target.o: target.asm
gcc -m32 -g -Wall -ansi -c -o target.o target.asm
.PHONY: clean
clean:
rm -f *.o schemeCompiler
And this is the error I get:
gcc -m32 -g -Wall -ansi -c -o target.o target.asm
gcc: warning: target.asm: linker input file unused because linking not done
gcc -g -m32 -Wall -o schemeCompiler target.o
gcc: error: target.o: No such file or directory
gcc: fatal error: no input files
compilation terminated.
I've put the makefile with the asm file in the same directory
Thanks !
***We've figured out the problem , we weren't running the make command right. Also the makefile wasn't right:
.SUFFIXES: .asm
all:schemeCompiler
schemeCompiler:$#
gcc -g -m32 -Wall -o schemeCompiler $#
%: %.asm
gcc -x c -o $# $<
.PHONY: clean
clean:
rm -f *.o schemeCompiler