CODEWITHSUNDEEP
cmakefilecompilationsize
Shivendra Pratap Kushwaha
Shivendra Pratap Kushwaha

Reputation: 2019

compilation of same c program from different directory generates object code of different size

I have a c program kept at different directories 'source1/abc.c' and 'source2/abc.c'. I want to generate the object code in 'object1/abc.o' and 'object2/abc.o'. Both abc.c program in source1 and source2 directory are same. But after compilation both the objects( i.e. abc.o ) of object1 and object2 are of different size. I am taking same flag for compilation.

I tries compiling the code from some other directory, other than object1 and object2 and the size after compilation are same.

cc -c source1/abc.c -DLINUX -D_LARGE_THREADS -D_THREAD_SAFE -D_REENTRANT -pthread -D_GNU_SOURCE -g -fPIC -O3  -lpthread  -lm  -lrt  -o object1/abc.o
cc -c source2/abc.c -DLINUX -D_LARGE_THREADS -D_THREAD_SAFE -D_REENTRANT -pthread -D_GNU_SOURCE -g -fPIC -O3  -lpthread  -lm  -lrt  -o object2/abc.o

The size of abc.o should be equal or does it depend on the directories from which it is running? What are the dependencies while compilation of c program?

Upvotes: 4

Views: 118

Answers (2)

hissroth
hissroth

Reputation: 251

I think it's because of the -g.

Upvotes: 0

BeWaterMyFriend
BeWaterMyFriend

Reputation: 84

You're compiling with -g option, which adds debug Information to the object file. These might contain path Information of the source files, so different paths lead to different symbols and a different total file size.

Upvotes: 5

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