If there are no undefined symbols then there is no Dynamic section, no
DT_SYMTAB, and no DT_HASH/DT_GNU_HASH; and --export-dynamic fails silently. So
there is no way to have a module (ET_EXEC or ET_DYN) that has no undefined
symbols, yet exports some of its own symbols for use by other modules.
Steps to Reproduce:
1. cat <<EOF >export.S
_start: .globl _start
movl foo,%ebx
movl $1,%eax
int $0x80
.data
foo: .globl foo
.int 42
EOF
2. gcc -o export -nostartfiles -nostdlib -Wl,--export-dynamic export.S
3. readelf --all export | grep -i dynamic
Actual results:
There is no dynamic section in this file.
Expected results:
Dynamic section at offset 0x.... contains .. entries:
[This bug was originally reported in
http://bugzilla.redhat.com/show_bug.cgi?id=444628 and is fowarded here at the
suggestion of a maintainer.]
--
Summary: ld: --export-dynamic fails if no undefined symbols
Product: binutils
Version: 2.18
Status: NEW
Severity: normal
Priority: P2
Component: ld
AssignedTo: unassigned at sources dot redhat dot com
ReportedBy: jreiser at BitWagon dot com
CC: bug-binutils at gnu dot org
GCC target triplet: i686-pc-linux-gnu
http://sourceware.org/bugzilla/show_bug.cgi?id=6468
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