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Date:	Tue, 7 Jun 2016 22:31:53 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: nm for .exe extensions?
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On Jun  7 19:23, Ismail Donmez wrote:
> Hi,
>=20
> On Tue, Jun 7, 2016 at 7:12 PM, Corinna Vinschen
> <corinna-cygwin AT cygwin DOT com> wrote:
> > On Jun  7 08:43, Bill Smith wrote:
> >> Warren Young-2 wrote
> >> > On May 24, 2016, at 6:43 AM, Benjamin Cao &lt;
> >>
> >> > becao@
> >>
> >> > &gt; wrote:
> >> >>
> >> >> The executable, when run with nm in Cygwin, results in a "no symbol=
s"
> >> >> result, whereas it generates a symbol table in unix.
> >> >
> >> > That=E2=80=99s not what I see here.  Given hello.c containing a =E2=
=80=9CHello, world!=E2=80=9D
> >> > program:
> >> >
> >> >   $ make hello
> >> >   cc     hello.c   -o hello
> >> >   $ nm hello.exe | wc -l
> >> >   389
> >> >
> >> > If I strip the exe, I get =E2=80=9CNo symbols,=E2=80=9D as expected.=
  There=E2=80=99s no reason a
> >> > finished executable should have much in the way of exported symbols
> >> > without debug info, since it is self-contained.  You would only expe=
ct to
> >> > get useful output from nm on a stripped binary if it=E2=80=99s an ob=
ject file or a
> >> > DLL.
> >>
> >> Hi, I'm picking this issue up from my colleague, Ben Cao.  We're using
> >> Visual Studio C++ to compile the executables/objects.  Is the issue th=
at
> >> Visual Studio places the information in the .pdb file?  That's why nm
> >> doesn't display any info on an *.exe ?
> >
> > PDB is an undocumented and potentially patent-encumbered format, that's
> > why the binutils tools can't read or write it.
>=20
> This will hopefully be no longer true in the future:
> https://github.com/Microsoft/microsoft-pdb

Interesting.  Now somebody just have to pick this up and port it to
binutils...  (the good old SHTDI meme ;))


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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