[Bug ld/24486] New: ld shouldn't complain undefined weak refereence

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=24486

            Bug ID: 24486
           Summary: ld shouldn't complain undefined weak refereence
           Product: binutils
           Version: 2.33 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
  Target Milestone: ---

address@hidden lto-6]$ cat foo.c 
extern void bar (void) __attribute__((weak));

void
foo (void)
{
  if (bar)
    bar ();
}
address@hidden lto-6]$ cat lib.c
int FLAGS_verbose;
address@hidden lto-6]$ cat x.c 
extern int FLAGS_verbose;
extern void bar (void);

int
a(const char *b) {
return FLAGS_verbose;
}
void unused (void) { bar(); }
int main() { a(""); return 0; }
address@hidden lto-6]$ make clean
rm -f *.o *.so x *.out ./*.s ./*.res
address@hidden lto-6]$ cat foo.c 
extern void bar (void) __attribute__((weak));

void
foo (void)
{
  if (bar)
    bar ();
}
address@hidden lto-6]$ cat lib.c 
int FLAGS_verbose;
address@hidden lto-6]$ cat x.c
extern int FLAGS_verbose;
extern void bar (void);
int
a(void) {
return FLAGS_verbose;
}
void unused (void) { bar(); }
int main() { return a (); }
address@hidden lto-6]$ make
gcc -B./ -O -flto   -c -o x.o x.c
gcc -B./ -O   -c -o lib.o lib.c
gcc -B./ -O -fpic   -c -o foo.o foo.c
gcc -B./ -shared -O -o libfoo.so foo.o
gcc -B./ -shared -O -o libx.so lib.o libfoo.so
gcc -B./ -o x x.o libx.so -Wl,--as-needed -L. -lfoo
./ld: ./libfoo.so: undefined reference to `bar'
collect2: error: ld returned 1 exit status
make: *** [Makefile:20: x] Error 1
address@hidden lto-6]$ readelf -s ./libfoo.so | grep bar
     2: 0000000000000000     0 NOTYPE  WEAK   DEFAULT  UND bar

Weak undefined reference is OK.

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