Re: A glibc dynamic linker or gld bug?

[Geoff Keating <geoffk@ozemail.com.au>]

Um.  The test case wouldn't have made things much clearer because I
sent the wrong version.  Try this.

-- 
Geoffrey Keating <geoffk@ozemail.com.au>

===File ~/glibc-tests/weaktest.c============================
#define CONCAT(x,y) x ## y
#define CONCAT2(x,y) CONCAT(x,y)
#define STRING(x) #x
#define STRING2(x) STRING(x)

#ifdef WEAKDATA
#pragma weak dataitem
#endif

int dataitem = NUM;

int CONCAT2(getdataitem_,NUM)(void) 
{
  return dataitem;
}

extern int getdataitem_1(void);
extern int getdataitem_2(void);
extern int getdataitem_3(void);
extern int getdataitem_4(void);

#ifdef MAIN
#include <stdio.h>
int main(void)
{
  static int (*const (funcs[MAIN]))(void) = {
    getdataitem_1,
#if MAIN >= 2
    getdataitem_2,
#endif
#if MAIN >= 3
    getdataitem_3,
#endif
#if MAIN >= 4
    getdataitem_4
#endif
  };
  int i;

  for (i = 0; i < MAIN; i++)
    if (funcs[i])
      printf("%d ", funcs[i]());
    else
      printf("NULL ", i+1);
  printf("\n");
}
#endif
============================================================

===File ~/glibc-tests/weaktest.sh===========================
#!/bin/sh
set -x
set -e
gcc -c -DNUM=1 weaktest.c -O -o weak1-strong.o
gcc -c -DNUM=1 -DWEAKDATA weaktest.c -O -o weak1-weak.o
gcc -c -DNUM=1 -fpic -DWEAKDATA weaktest.c -O -o weak1-weak-pic.o
gcc -shared -DNUM=2 -DWEAKDATA -fpic weaktest.c -O -o weak2-weak-pic.so
gcc -shared -DNUM=2 -fpic weaktest.c -O -o weak2-strong-pic.so
gcc -c -DNUM=3 -DWEAKDATA -DMAIN=3 weaktest.c -O -o weak3-weak-main.o

gcc weak1-weak.o ./weak2-weak-pic.so weak3-weak-main.o -o weak-w-wp-wm
gcc weak1-weak.o ./weak2-strong-pic.so weak3-weak-main.o -o weak-w-sp-wm
gcc ./weak2-weak-pic.so weak3-weak-main.o weak1-strong.o -o weak-wp-wm-s
gcc ./weak2-strong-pic.so weak3-weak-main.o weak1-strong.o -o weak-sp-wm-s

set +e
./weak-w-wp-wm
./weak-w-sp-wm
./weak-wp-wm-s
./weak-sp-wm-s
============================================================