#include not working right?

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2 total messages Started by Matt Stainforth Thu, 05 Dec 1996 00:00

#6127

Author: Matt Stainforth
Date: Thu, 05 Dec 1996 00:00

86 lines
3632 bytes

Does anyone know why this is happening?
# gcc -c ping.c -o ping.o
# gcc ping.o -o ping -L../lib -linet6 -lresolv
ping.o: In function `main':
ping.o(.text+0x7c0): undefined reference to `clear_bit'
ping.o(.text+0x7d1): undefined reference to `clear_bit'
ping.o(.text+0x7e2): undefined reference to `clear_bit'
ping.o(.text+0x7f3): undefined reference to `clear_bit'
ping.o(.text+0x807): undefined reference to `clear_bit'

This is clear_bit which is defined in <asm/bitops.h>, which is included:

extern __inline__ int clear_bit(int nr,   void * addr)
{
        int oldbit;

        __asm__ __volatile__(""
                "btrl %2,%1\n\tsbbl %0,%0"
                :"=r" (oldbit),"=m" ((*(struct __dummy *) addr) )
                :"ir" (nr));
        return oldbit;
}

So, I figure, I'll take the long way around to see where I'm losing clear_bit.

# rm -f ping.o
# gcc -E ping.c > pingnew.c
# grep clear_bit pingnew.c
extern __inline__ int clear_bit(int nr,   void * addr)
        clear_bit( 1   & 0x1f, &((  &filter )->data[ 1   >> 5])) ;
        clear_bit( 2   & 0x1f, &((  &filter )->data[ 2   >> 5])) ;
        clear_bit( 3   & 0x1f, &((  &filter )->data[ 3   >> 5])) ;
        clear_bit( 4   & 0x1f, &((  &filter )->data[ 4   >> 5])) ;
        clear_bit( 129   & 0x1f, &((  &filter )->data[ 129   >> 5])) ;

ok...there it is.  clear_bit is in there, and there are the 5 calls to
the function.  But watch this:

# /usr/lib/gcc-lib/i486-linux/2.7.2.1/cc1 pingnew.c
 ustat cmsg_nxthdr __ntohl __ntohs set_bit clear_bit change_bit test_bit find_first_zero_bit find_next_zero_bit ffz main catcher pinger pr_pack pr_icmph tvsub finish pr_addr fill usage
time in parse: 0.800000
time in integration: 0.000000
time in jump: 0.000000
time in cse: 0.000000
time in loop: 0.000000
time in cse2: 0.000000
time in flow: 0.090000
time in combine: 0.000000
time in sched: 0.000000
time in local-alloc: 0.000000
time in global-alloc: 0.510000
time in sched2: 0.000000
time in dbranch: 0.000000
time in shorten-branch: 0.000000
time in stack-reg: 0.010000
time in final: 0.150000
time in varconst: 0.030000
time in symout: 0.000000
time in dump: 0.000000
# grep clear_bit pingnew.s
        call clear_bit
        call clear_bit
        call clear_bit
        call clear_bit
        call clear_bit
# 

So where did clear_bit go?  

Needless to say, when I try to as the pingnew.s file, it fails with the
error message above (ping.o(.text+0x7c0): undefined reference to `clear_bit')
five times.  

Why is gcc dropping that definition.  For that matter, why is cc1 dropping 
it?

-- 
Matt...
______________________________________________________________________________
Matthew Stainforth           
Information Systems Analyst           require "disclaim.pl";       
NBCC - Moncton Campus          &Disclaim($opinions)||die "drop dead $!"; 
Phone: (506) 856-2616            
Email: mbs@gov.nb.ca                          _/\o_ 
______________________________________________________________________________

Re: #include not working right?

#6135

Author: Andreas Schwab
Date: Fri, 06 Dec 1996 00:00

33 lines
1914 bytes

Matt Stainforth <mbs@paladine.moncton.nbcc.nb.ca> writes:

|> Does anyone know why this is happening?
|> # gcc -c ping.c -o ping.o
|> # gcc ping.o -o ping -L../lib -linet6 -lresolv
|> ping.o: In function `main':
|> ping.o(.text+0x7c0): undefined reference to `clear_bit'
|> ping.o(.text+0x7d1): undefined reference to `clear_bit'
|> ping.o(.text+0x7e2): undefined reference to `clear_bit'
|> ping.o(.text+0x7f3): undefined reference to `clear_bit'
|> ping.o(.text+0x807): undefined reference to `clear_bit'

|> This is clear_bit which is defined in <asm/bitops.h>, which is included:

|> extern __inline__ int clear_bit(int nr,   void * addr)
|> {
|>         int oldbit;

|>         __asm__ __volatile__(""
|>                 "btrl %2,%1\n\tsbbl %0,%0"
|>                 :"=r" (oldbit),"=m" ((*(struct __dummy *) addr) )
|>                 :"ir" (nr));
|>         return oldbit;
|> }

You are not optimizing, so inlining is not performed.  Because clear_bit
is declared extern, no non-inline version is generated either.  So either
enable the optimizer or provide a non-inline definition of clear_bit (for
example, by changing extern to static).
-- 
Andreas Schwab                                      "And now for something
schwab@issan.informatik.uni-dortmund.de              completely different"

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