CODEWITHSUNDEEP
linuxmakefile
Naren
Naren

Reputation: 148

When compiling through Makefile, getting some errors while copying a file

On Linux, when compiling through Makefile, I get some errors while copying a target:

all: $(TARGET)

$(TARGET): $(OBJ)
     $(AR) $(ARFLAGS) $(TARGET) $(OBJ)
     chmod 775 $(ETARGET) $(OBJ)
     $(shell cp libTrgt.a ../../../../lib)

During this makefile is giving an error

cp: cannot stat `libTrgt.a': No such file or directory,

even though I see it is there in the current directory.

When I split it in two targets, it succeeds and I am not sure why:

all: $(TARGET) COPY

$(TARGET): $(OBJ)
     $(AR) $(ARFLAGS) $(TARGET) $(OBJ)
     chmod 775 $(ETARGET) $(OBJ)

COPY:
     $(shell cp libTrgt.a ../../../../lib)

What is causing the error?

Upvotes: 0

Views: 327

Answers (1)

Didier Trosset
Didier Trosset

Reputation: 37467

The problem here is that the $(shell ...) command is executing while parsing the Makefile, whereas the commands to create the library $(AR) is executing later on.

At the time the copy command is executed, the library file does not exist. Yet.

You should more simply write your Makefile as:

all: $(TARGET)

$(TARGET): $(OBJ)
     $(AR) $(ARFLAGS) $(TARGET) $(OBJ)
     chmod 775 $(ETARGET) $(OBJ)
     cp libTrgt.a ../../../../lib/

Upvotes: 3

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