[Bug ld/3249] New: Msg "multiple definition of" with "-feliminate-dwarf2_dups" involvement

[rbh00 at utsglobal dot com]

I attempted to build the kernel with -feliminate-dwarf2-dups to see what would
break.  My goal was to reduce the size of the kernel-debuginfo rpm; it's now
in the neighborhood of 850 megabytes.  I got an error early on and reduced it
to the following simple case involving four files, given below.  The output of
the command "make bad" follows:

-------- output of "make clean bad" starts
$ make clean bad
rm -f *.o z
cc -g -feliminate-dwarf2-dups   -c -o a.o a.c
ld -r -o b.o a.o
cc -g -feliminate-dwarf2-dups   -c -o c.o c.c
cc -o z b.o c.o
c.o: In function `DW.z.h.aabf8719.0':
c.c:(.gnu.linkonce.wi.z.h.aabf8719+0x19): multiple definition of 
`DW.z.h.aabf8719.0'
b.o:(.debug_info+0xa3): first defined here
collect2: ld returned 1 exit status
make: *** [bad] Error 1
$
-------- end output

and here's the output of "make clean good":
-------- start
$ make clean good
rm -f *.o z
cc -g -feliminate-dwarf2-dups   -c -o a.o a.c
cc -g -feliminate-dwarf2-dups   -c -o c.o c.c
cc -o z a.o c.o
$
-------- end

The same bug shows up in ld version: GNU ld version 2.16.91.0.6 20060212 and
a version I made yesterday 9/21/06 from the cvs tree: GNU ld version 2.17.50
20060922.  The version of gcc is the current one on Fedora Core 5:  gcc (GCC)
4.1.1 20060525 (Red Hat 4.1.1-1).

Here are the four source files, from "head -99 a.c c.c z.h Makefile":

-------- start of source files
==> a.c <==
#include "z.h"

struct foo_s foo;

int
main(int argc, char *argv[])
{
        doprintf();
}

==> c.c <==
#include "z.h"

struct foo_s foo;

doprintf() {
        return;
}

==> z.h <==
struct foo_s {
        int foo;
};

==> Makefile <==
CFLAGS = -g -feliminate-dwarf2-dups

all:
        echo "Choose target 'bad' or 'good'"

b.o:    a.o
        $(LD) -r -o $@ $<

good:   a.o c.o
        $(CC) -o z a.o c.o

bad:    b.o c.o
        $(CC) -o z b.o c.o

clean:
        rm -f *.o z
-------- end of source files

Richard Hitt

-- 
           Summary: Msg "multiple definition of" with "-feliminate-
                    dwarf2_dups" involvement
           Product: binutils
           Version: 2.17
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
        AssignedTo: unassigned at sources dot redhat dot com
        ReportedBy: rbh00 at utsglobal dot com
                CC: bug-binutils at gnu dot org


http://sourceware.org/bugzilla/show_bug.cgi?id=3249

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