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Ben Hamilton f548d75c9f [dump_syms/Mac] New -x option to prefer extern names when there's a mismatch 
When built with -gmlt, .dSYMs are (by design) missing the
`DW_AT_linkage_name` which Breakpad uses to fill out the
(name-mangled) function names.

Thankfully, the .dSYM contains both the old-school LC_SYMTAB command
containing the STABS-format symbols (which include the fully-qualified
C++ symbol names we want, but no actual compilation unit data), as
well as the LC_SEGMENT_64 containing the __DWARF segment with the
minimal -gmlt debug information (which excludes the name-mangled C++
symbols).

Unfortunately, since the .dSYM's STABS does not define compilation
units, the usual path in `StabsReader` ignores all the fully-qualified
C++ symbol names for the functions:

bd9d94c708/src/common/stabs_reader.cc (100)

Fortunately, when built for macOS platforms (`HAVE_MACH_O_NLIST_H`),
`StabsReader` supports storing all the STABS-format symbols as
`Extern`s, regardless of whether or not they're in a compilation unit:

bd9d94c708/src/common/stabs_reader.cc (119)

Currently, when there's both a `Function` and an `Extern` with the same address, `Module` discards the `Extern`:

bd9d94c708/src/common/module.cc (161)

This CL adds a new `-x` option to the Mac `dump_syms` which prefers
the Extern function name if there's a mismatch.

Bug: https://bugs.chromium.org/p/google-breakpad/issues/detail?id=883
Change-Id: I0d32adc64fbf567600b0a5ca63c71c422b7f0f8c
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/4453650
Reviewed-by: Joshua Peraza <jperaza@chromium.org>
2023-04-24 16:46:57 +00:00
.github/workflows github: update to latest coverity scan action 2022-02-08 17:27:36 +00:00
android Update copyright boilerplate, 2022 edition (Breakpad) 2022-09-07 16:59:53 +00:00
autotools regen autotools 2022-06-30 06:44:14 +00:00
docs Add docs for INLINE and INLINE_ORIGIN in overview 2022-03-14 22:47:01 +00:00
m4 enables C++17 mode 2022-10-14 19:08:12 +00:00
src [dump_syms/Mac] New -x option to prefer extern names when there's a mismatch 2023-04-24 16:46:57 +00:00
.clang-format Add a .clang-format file to give us local control over Chromium style. 2020-08-31 18:46:34 +00:00
.gitignore gyp: drop unused build system 2022-12-05 01:38:54 +00:00
aclocal.m4 Add DisassemblerObjdump. 2022-10-12 17:19:44 +00:00
appveyor.yml Appveyor CI for Windows MSVS build 2017-02-13 17:57:15 +00:00
AUTHORS Make build system less annoying (#8) r=bryner 2006-08-30 20:05:05 +00:00
breakpad-client.pc.in make "make install" also install headers and pkgconfig files 2014-08-27 02:10:55 +00:00
breakpad.pc.in make "make install" also install headers and pkgconfig files 2014-08-27 02:10:55 +00:00
ChangeLog Initial import, which includes the Windows client-side dump_syms tool, and 2006-08-25 21:14:45 +00:00
codereview.settings codereview.settings: do not force squashing behavior 2019-08-14 17:56:21 +00:00
configure Fix Cygwin builds after enabling c++17 mode. 2023-01-19 18:04:53 +00:00
configure.ac Fix Cygwin builds after enabling c++17 mode. 2023-01-19 18:04:53 +00:00
default.xml gyp: drop unused build system 2022-12-05 01:38:54 +00:00
DEPS gyp: drop unused build system 2022-12-05 01:38:54 +00:00
DIR_METADATA add DIR_METADATA settings 2021-11-25 04:02:40 +00:00
INSTALL autoreconf -f -i 2013-12-10 17:53:50 +00:00
LICENSE Update LICENSE file. 2023-01-27 20:35:32 +00:00
Makefile.am Refactor DisassemblerObjdump. 2023-01-31 00:35:06 +00:00
Makefile.in Refactor DisassemblerObjdump. 2023-01-31 00:35:06 +00:00
NEWS Initial import, which includes the Windows client-side dump_syms tool, and 2006-08-25 21:14:45 +00:00
OWNERS add OWNERS settings 2021-06-03 16:26:13 +00:00
README.ANDROID Update symbol file documentation links. 2016-06-10 06:29:06 -04:00
README.md CI: convert Travis to GH actions 2021-10-14 09:00:39 +00:00

README.md

Breakpad

Breakpad is a set of client and server components which implement a crash-reporting system.

Getting started (from main)

  1. First, download depot_tools and ensure that they’re in your PATH.

  2. Create a new directory for checking out the source code (it must be named breakpad).

    mkdir breakpad && cd breakpad

  3. Run the fetch tool from depot_tools to download all the source repos.

    fetch breakpad
cd src

  4. Build the source.

    ./configure && make

    You can also cd to another directory and run configure from there to build outside the source tree.

    This will build the processor tools (src/processor/minidump_stackwalk, src/processor/minidump_dump, etc), and when building on Linux it will also build the client libraries and some tools (src/tools/linux/dump_syms/dump_syms, src/tools/linux/md2core/minidump-2-core, etc).

  5. Optionally, run tests.

    make check

  6. Optionally, install the built libraries

    make install

If you need to reconfigure your build be sure to run make distclean first.

To update an existing checkout to a newer revision, you can git pull as usual, but then you should run gclient sync to ensure that the dependent repos are up-to-date.

To request change review

  1. Follow the steps above to get the source and build it.

  2. Make changes. Build and test your changes. For core code like processor use methods above. For linux/mac/windows, there are test targets in each project file.

  3. Commit your changes to your local repo and upload them to the server. http://dev.chromium.org/developers/contributing-code e.g. git commit ... && git cl upload ... You will be prompted for credential and a description.

  4. At https://chromium-review.googlesource.com/ you'll find your issue listed; click on it, then “Add reviewer”, and enter in the code reviewer. Depending on your settings, you may not see an email, but the reviewer has been notified with google-breakpad-dev@googlegroups.com always CC’d.