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[Bug ld/6468] New: ld: --export-dynamic fails if no undefined symbols

From: jreiser at BitWagon dot com
Subject: [Bug ld/6468] New: ld: --export-dynamic fails if no undefined symbols
Date: 29 Apr 2008 17:59:42 -0000

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

foo: .globl foo
        .int 42
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


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