Add dump_syms for DWARF symbols in a PECOFF image, as used by cygwin and mingw

Add dump_syms for DWARF symbols in a PECOFF image, as used by cygwin and mingw

For the cygwin target, build a dump_syms tool which can read DWARF symbols
contained in a PE/COFF executable.

I felt a bit bad about just making another copy of dump_symbols.cc, so this one
is parameterized by an image file reader class, and then applied to a
pecoff-format image file reading class.

The  pecoff image file reader:
- knows how to read PE32 and PE32+ image files
- makes a PECOFF file id by fetching it from a CV record or by hashing
- can read PECOFF exports as a fallback if there is no DWARF information

[Ted Mielczarek]

Hi there,

I'll try to find someone to review your patch. Just a few procedural bits before
we start:
1) Are you the original author of all this code, or did you reuse any of it from
an existing project? (I'm mostly concerned with license compatibility and
correct copyright attribution.)
2) Do you have a contributor license agreement on file with Google? If not
you'll need to get one of those sorted before we can take your patch:
https://developers.google.com/open-source/cla/individual

[jon.turney]

On 08/04/2014 14:36, ted.mielczarek@gmail.com wrote:
> I'll try to find someone to review your patch. Just a few procedural
> bits before we start:
> 1) Are you the original author of all this code, or did you reuse any of
> it from an existing project? (I'm mostly concerned with license
> compatibility and correct copyright attribution.)

I am the author of all of it which is not copied from existing breakpad code.

> 2) Do you have a contributor license agreement on file with Google? If
> not you'll need to get one of those sorted before we can take your
> patch: https://developers.google.com/open-source/cla/individual

I filled in that form when asked to on January 28th.

http://code.google.com/p/google-breakpad/issues/detail?id=219#c14

[Ted Mielczarek]

Mark: can you find someone to review this patch? I don't have the bandwidth for
it right now.

[j.turney]

Small update

Fix compilation by updating use of Module::Extern() to match change in r1415
Fix some -Werror=sign-compare errors arising due to signedness of size_t
Fix export table fallback to match reality rather than PE/COFF spec.
Properly swap endianess of buildid UUID