[Bug ld/6744] New: --export-dynamic does nothing for Cygwin .exe's

[yselkowitz at users dot sourceforge dot net]

When linking a program with -Wl,--export-dynamic, no symbols are
exported.  The problem arises when the executable needs to either dlopen
itself, or when it has plugins which are "linked" against it.  Both
scenarios are not uncommon, particularly with GNOME software.

While this does work on Linux, it does not work on Cygwin with
--export-dynamic; only --export-all-symbols, an i386PE-specific flag,
will accomplish this.

I'm attaching a test case; it's a simplified version of the test used in
LT_SYS_DLOPEN_SELF (prev. AC_LIBTOOL_DLOPEN_SELF):

$ gcc -o test.exe dlopen-self.c && ./test.exe
status = 0

$ gcc -Wl,--export-dynamic -o test.exe dlopen-self.c && ./test.exe
status = 0

$ gcc -Wl,--export-all-symbols -o test.exe dlopen-self.c && ./test.exe
status = 1

Running 'objdump -p test.exe' will also show that the export table is
only generated in the last case.

I would appreciate your input on this issue.

-- 
           Summary: --export-dynamic does nothing for Cygwin .exe's
           Product: binutils
           Version: 2.19 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
        AssignedTo: unassigned at sources dot redhat dot com
        ReportedBy: yselkowitz at users dot sourceforge dot net
                CC: bug-binutils at gnu dot org
 GCC build triplet: i686-pc-cygwin
  GCC host triplet: i686-pc-cygwin
GCC target triplet: i686-pc-cygwin


http://sourceware.org/bugzilla/show_bug.cgi?id=6744

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