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Questions[gcc]

Martin Hope
NaCl
Asked: 2020-03-29 06:57:37 +0800 CST
  • 8

I have the following problem, assuming my project structure is the following ( /is the root).

/bin                   # Directorio vacío, es la salida del makefile.
/include/*.h           # assembler.h core.h utils.h, Todos los headers estan aquí.
/src/assembler/*.c     # assembler.c tokenizer.c y otras herramientas del ensamblador.
/src/core/*.c          # utils.c core.c y todos los ficheros del núcleo compartido.
/src/machine/*.c       # bla.c foo.c .... Todos los ficheros de la máquina virtual.

All projects under /srchave the project as a dependency core, but have access to the directory headers/include

Using GNU makeI need to be able to compile only one of the projects I am working on, without the need to alter other projects, so far I have used the following Makefile:

# #$@% Makefile
CC=gcc
FLAGS=-Wall -Wextra -Wpedantic -Werror -std=c11 -O3
INCLUDES=-Iinclude

checkbin:
    # Ensure bin is there.
    @if [ ! -e "bin" ]; then mkdir "bin"; fi

assembler: checkbin # First check for binaries folder.
    $(CC) -o bin/assembler $(INCLUDES) $(FLAGS) src/core/*.c src/assembler/*.c

vm: checkbin
    $(CC) -o bin/vm $(INCLUDES) $(FLAGS) src/core/*.c src/machine/*.c

clean:
    @if [ -e "bin" ]; then \
        rm -rf "bin"; \
    fi

default: assembler # set assembler to default...

He Makefileactually does the work, but he does a lot of work; it is recompiling the coreevery time i go to compile some other project like machineor assembler.

To compile them separately I know I have to use the flag -c, gccbut when inputting multiple files with this flag, it doesn't allow me to use the flag -oto specify the output, for example:

$(CC) -c $(FLAGS) $(INCLUDES) /src/core/*.c 
# Si intento poner -o "bin/core" en este caso, me arroja error

How can I move the compiled files of the dependency project , for this case, coreinto their respective directory /bin/coreso that it can be used later to compile any other project?

For example:

/bin/core/utils.o
/bin/core/core.o

And binds to the following statement:

# Asumiendo los valores puestos arriba:
assembler: checkbin
    @if [ ! -e "bin/assembler" ]; then mkdir "bin/assembler"; fi
    # ... <- instrucción que pondrá los .o en el directorio /bin/assembler/*.o
    $(CC) -o /bin/assembler/assembler /bin/core/*.o /bin/assembler/*.o
    # Sólo necesitamos enlazar los archivos objeto.
gcc