CODEWITHSUNDEEP
gcccompilation
Thibault
Thibault

Reputation: 598

GCC doesn't want to change output file

It seems that since I installed the latest version of GCC, I am no longer able to compile any C file if I want to change the output file. Let's take an example, file hello.c:

#include <stdlib.h>
#include <stdio.h>

int main()
{
     printf("hello\n");
}

If I do :

gcc hello.c

It works fine and I have the a.out output. But if I want to change the name of the output, I should basically do :

gcc -o hello.c hello

Am I right?

If so, I get this error :

gcc: error: hello: No such file or directory
gcc: fatal error: no input files
compilation terminated

For another example, it goes totally WTF :

gcc -o Simplexe.c Simplexe
Simplexe: In function `_fini':
(.fini+0x0): multiple definition of `_fini'
/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/crti.o:(.fini+0x0): first defined here
Simplexe: In function `__data_start':
(.data+0x0): multiple definition of `__data_start'
/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/crt1.o:(.data+0x0): first defined here
Simplexe: In function `__data_start':
(.data+0x8): multiple definition of `__dso_handle'
/usr/lib/gcc/x86_64-linux-gnu/4.6/crtbegin.o:(.data+0x0): first defined here
Simplexe:(.rodata+0x0): multiple definition of `_IO_stdin_used'
/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/crt1.o:(.rodata.cst4+0x0): first defined here
Simplexe: In function `_start':
(.text+0x0): multiple definition of `_start'
/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/crt1.o:(.text+0x0): first defined here
Simplexe: In function `_init':
(.init+0x0): multiple definition of `_init'
/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/crti.o:(.init+0x0): first defined here
/usr/lib/gcc/x86_64-linux-gnu/4.6/crtend.o:(.dtors+0x0): multiple definition of `__DTOR_END__'
Simplexe:(.dtors+0x8): first defined here
/usr/bin/ld: error in Simplexe(.eh_frame); no .eh_frame_hdr table will be created.

I have never seen something like that, and it deleted my source file. I got caught once, I will never be anymore.

Upvotes: 0

Views: 6469

Answers (2)

Oleksandr Kravchuk
Oleksandr Kravchuk

Reputation: 6327

-o specified output file, which is hello.c in your case, so you are trying to compile file hello, which doesn't exist. Correct command would be:

gcc hello.c -o hello

Upvotes: 1

Olaf Dietsche
Olaf Dietsche

Reputation: 74078

Change

gcc -o hello.c hello

to

gcc -o hello hello.c

-o is followed by the target, not the source.

Your second case could occur, if the target Simplexe exists and now gcc tries to link this again into the "target" Simplexe.c, but that's just a guess.

Upvotes: 4

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