CODEWITHSUNDEEP
cmakefile
user5228393
user5228393

Reputation:

Makefile Executable Error

I have the following Makefile:

all: test.c test1.c
    gcc -o test test.c -lm
    gcc -o test1 test1.c
    ./test 1000 input.txt

I am getting an error like ./test 1000 input.txt make: *** [run] Error 255. Is the Makefile correct?

Upvotes: 1

Views: 1924

Answers (1)

Jonathon Reinhart
Jonathon Reinhart

Reputation: 137398

./test 1000 input.txt make: *** [run] Error 255

This doesn't mean anything is wrong with your Makefile. It means that your ./test program ran an exited with status 255.

You haven't showed us test.c, but I'm assuming you didn't write return 255;. Since the exit status is usually only 8 bits, it's possible you (incorrectly) wrote return -1. It's also possible that you (incorrectly) omitted a return statement from main which leads to Undefined Behavior, and -1 happens to be in the return value register (eax on x86).

You should always enable compiler warnings. To force you to correct them, these warnings (which often indicate broken code) should cause the compilation to fail as well.

CFLAGS = -Wall -Wextra -Werror

test: test.c
        $(CC) $(CFLAGS) -o $@ $^

Upvotes: 2

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