https://sourceware.org/bugzilla/show_bug.cgi?id=21334
Bug ID: 21334
Summary: [MIPS] Undefined hidden symbols cause assertion
failure bfd/elfxx-mips.c:3860
Product: binutils
Version: 2.28
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: james410 at cowgill dot org.uk
Target Milestone: ---
Originally from the Debian supermin package:
https://buildd.debian.org/status/fetch.php?pkg=supermin&arch=mipsel&ver=5.1.17-7%2Bb1&stamp=1490538317&raw=0
And possibly related to a bug mentioned in PR/21233
Attempting to link any object containing an undefined hidden symbol causes ld
to give an assertion failure.
$ cat test.c
extern int a __attribute__((visibility("hidden")));
int x(void)
{
a = 1;
}
$ mipsel-linux-gnu-gcc -c test.c
$ readelf --syms test.o
Symbol table '.symtab' contains 14 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 00000000 0 NOTYPE LOCAL DEFAULT UND
1: 00000000 0 FILE LOCAL DEFAULT ABS test.c
2: 00000000 0 SECTION LOCAL DEFAULT 1
3: 00000000 0 SECTION LOCAL DEFAULT 3
4: 00000000 0 SECTION LOCAL DEFAULT 4
5: 00000000 0 SECTION LOCAL DEFAULT 9
6: 00000000 0 SECTION LOCAL DEFAULT 5
7: 00000000 0 SECTION LOCAL DEFAULT 6
8: 00000000 0 SECTION LOCAL DEFAULT 7
9: 00000000 0 SECTION LOCAL DEFAULT 10
10: 00000000 0 SECTION LOCAL DEFAULT 11
11: 00000000 60 FUNC GLOBAL DEFAULT 1 x
12: 00000000 0 OBJECT GLOBAL DEFAULT UND _gp_disp
13: 00000000 0 NOTYPE GLOBAL HIDDEN UND a
$ ../build-mips/ld/ld-new test.o
../build-mips/ld/ld-new: warning: cannot find entry symbol __start; defaulting
to 00000000004000f0
../build-mips/ld/ld-new: BFD (GNU Binutils) 2.28.51.20170330 assertion fail
../../binutils-gdb/bfd/elfxx-mips.c:3860
test.o: In function `x':
test.c:(.text+0x18): undefined reference to `a'
The bug in supermin was actually caused by musl's use of this feature in
__libc_start_main, so I suspect that nothing will be able to link against musl
libc when using binutils 2.28.
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