https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69357
Bug ID: 69357
Summary: libgo refers to _end in a non-weak way
Product: gcc
Version: 5.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: go
Assignee: ian at airs dot com
Reporter: rguenth at gcc dot gnu.org
CC: cmang at google dot com
Target Milestone: ---
bfd has
/* A symbol from a library loaded via DT_NEEDED of some
other library is referenced by a regular object.
Add a DT_NEEDED entry for it. Issue an error if
--no-add-needed is used and the reference was not
a weak one. */
if (old_bfd != NULL
&& (elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0)
{
(*_bfd_error_handler)
(_("%B: undefined reference to symbol '%s'"),
old_bfd, name);
bfd_set_error (bfd_error_missing_dso);
goto error_free_vers;
}
and with -static-libgo you get a reference to _end from malloc.o from
runtime/malloc.goc:
void
runtime_mallocinit(void)
{
byte *p, *p1;
uintptr arena_size, bitmap_size, spans_size, p_size;
extern byte _end[];
which uses a non-weak reference to this "magic" symbol marking the end of the
BSS section.
Unfortunately all shlibs provide this symbol as well so if you do
gccgo-5 <prg> -lsomelib -static-libgo
the you get sth like the following from ld:
libgo.a(malloc.o): undefined reference to symbol '_end'
libselinux.so: error adding symbols: DSO missing from command line
bfd source suggests to make the _end reference in libgo weak.
