| Summary: | undefined reference to main when linking an object file generated from multiple .c files | ||
|---|---|---|---|
| Product: | gcc | Reporter: | Indan <indan> |
| Component: | c | Assignee: | Not yet assigned to anyone <unassigned> |
| Status: | RESOLVED DUPLICATE | ||
| Severity: | normal | CC: | gcc-bugs, indan |
| Priority: | P2 | ||
| Version: | 4.0.2 | ||
| Target Milestone: | 4.0.3 | ||
| Host: | Target: | ||
| Build: | Known to work: | ||
| Known to fail: | Last reconfirmed: | ||
*** This bug has been marked as a duplicate of 22544 *** Note if you want the compiling multiple .c into one .o files use -combine. (In reply to comment #2) > Note if you want the compiling multiple .c into one .o files use -combine. > Thanks for the quick reply and the tip. Shouldn't gcc either give an error, or restore the old behaviour? Would a patch doing one of the two be accepted? If so, what behaviour is prefered? Subject: Re: undefined reference to main when linking an object file generated from multiple .c files
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> ------- Comment #3 from indan at nul dot nu 2005-10-06 17:27 -------
> (In reply to comment #2)
> > Note if you want the compiling multiple .c into one .o files use -combine.
> >
>
> Thanks for the quick reply and the tip.
>
> Shouldn't gcc either give an error, or restore the old behaviour? Would a patch
> doing one of the two be accepted? If so, what behaviour is prefered?
Error out, like it did in 3.3.x and before, see the duplicated bug for
a little more details.
-- Pinski
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When making object files from multiple source files the main function seems to be thrown away or something. When compiling the .c into .o files seperately, and then linking that it works. It used to work with at least gcc 3.4.3. Minimal testcase: $ cat main.c int main(void) { return 7; } $ make cc -o test.o -c main.c empty.c cc -s test.o -o test /usr/lib/gcc/i686-pc-linux-gnu/4.0.2/../../../crt1.o: In function `_start': : undefined reference to `main' collect2: ld returned 1 exit status make: *** [test] Error 1 $ objdump -t test.o test.o: file format elf32-i386 SYMBOL TABLE: 00000000 l df *ABS* 00000000 empty.c 00000000 l d .text 00000000 .text 00000000 l d .data 00000000 .data 00000000 l d .bss 00000000 .bss 00000000 l d .note.GNU-stack 00000000 .note.GNU-stack 00000000 l d .comment 00000000 .comment $ cat empty.c $ cat Makefile default: test test.o: main.c empty.c cc -o test.o -c main.c empty.c clean: rm -f *.o test