chkpkg and soname-unused

[slowfranklin]

Am 04.11.2013 um 18:03 schrieb Rafael Ostertag <raos at opencsw.org>:

> Hi Dago
> 
> On Mon, Nov 04, 2013 at 05:44:09PM +0100, Dagobert Michelsen wrote:
>> Hi Rafi,
>> 
>>> Could it be related to the buildfarm update?
>> 
>> 
>> Probably, the T5220 is now running 105400-04 whereas unstable10x is still running 147441-19.
>> Should I update the x86 machines also? My impression is to patch as less as possible to
>> not introduce new linker symbol anomalies. The patch on the farm was needed to fix an ugly
>> bug in zfs which prevented us from doing backups, so no option of not installing ;-)
> 
> If it is related to Solaris patches, patching x86 would mean that `-z ignore'
> might not work on x86 anymore, as well. So, wouldn't it be smarter, to figure
> out why it stopped working on sparc?

It is sill working. Here’s an example where I’m linking a program with a library that is linked with another libary but doesn’t use any of it’s functions.

slowfranklin at unstable10s [unstable10s]:~ > for file in Makefile main.c lib.c anotherlib.c ; do echo $file\: ; cat $file; done                            
Makefile:
ALIB_LDFLAGS=
LIB_LDFLAGS=-z ignore -B direct
LDFLAGS=-z ignore -B direct

all: main

libanotherlib.so: anotherlib.c
        LD_OPTIONS="$(ALIB_LDFLAGS)" gcc -shared -o libanotherlib.so -fPIC anotherlib.c

libmylib.so: lib.c libanotherlib.so
        LD_OPTIONS="$(LIB_LDFLAGS)" gcc -shared -o libmylib.so -fPIC lib.c -L. -R. -lanotherlib

main: main.c libmylib.so
        LD_OPTIONS="$(LDFLAGS)" gcc -o main main.c -L. -R. -lmylib

clean:
        rm main libmylib.so libanotherlib.so
main.c:
int main(int argc, char **argv)
{
    func("test");
}
lib.c:
#include <stdio.h>

void func(const char *msg)
{
    printf("%s\n", msg);
}
anotherlib.c:
#include <stdio.h>

void anotherfunc(const char *msg)
{
    printf("%s\n", msg);
}
slowfranklin at unstable10s [unstable10s]:~ > make clean                                                                                                    
rm main libmylib.so libanotherlib.so
slowfranklin at unstable10s [unstable10s]:~ > make                                                                                                          
LD_OPTIONS="" gcc -shared -o libanotherlib.so -fPIC anotherlib.c
LD_OPTIONS="-z ignore -B direct" gcc -shared -o libmylib.so -fPIC lib.c -L. -R. -lanotherlib
LD_OPTIONS="-z ignore -B direct" gcc -o main main.c -L. -R. -lmylib
slowfranklin at unstable10s [unstable10s]:~ > elfdump -d main | grep NEED                                                                                   
       [1]  NEEDED            0x11b               libmylib.so
       [2]  NEEDED            0x105               libc.so.1
      [13]  VERNEED           0x106d8             
      [14]  VERNEEDNUM        0x1                 
slowfranklin at unstable10s [unstable10s]:~ >