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Error when importing the CEF Python 47 module: undefined symbol: cef::logging::LogMessage #230

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cztomczak opened this issue Jun 25, 2016 · 3 comments
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Error when importing the CEF Python 47 module: undefined symbol: cef::logging::LogMessage #230

cztomczak opened this issue Jun 25, 2016 · 3 comments
Milestone
v47

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@cztomczak
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cztomczak commented Jun 25, 2016 •
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Updated to CEF 47 in commit bc3b9aa - it builds fine, but there is this error when running example:

Traceback (most recent call last):
  File "wxpython.py", line 19, in <module>
    import cefpython_py27 as cefpython
ImportError: /home/czarek/github/cefpython/src/linux/binaries_64bit/cefpython_py27.so:
undefined symbol: _ZN3cef7logging10LogMessageC1EPKcii

Reported with details on the CEF Forum:
www.magpcss.org/ceforum/viewtopic.php?f=6&t=14269&p=31224

@allestuetsmerweh had the same issue when building idrissha's fork:
#195 (comment)

@sidreesshah Did you encounter the same issue when building newer CEF and if so how did you fix this?
@cztomczak
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This can be fixed by changing the order of libraries during linking in linux/setup/setup.py:

     libraries=[
+        'cefpythonapp',
         'cef_dll_wrapper',
         'client_handler',
-        'cefpythonapp',
         'cpp_utils',
         'gtk-x11-2.0',

cztomczak added a commit that referenced this issue Jun 26, 2016
@cztomczak
Feed cefpythonapp before cef/cef_dll_wrapper to the linker (#230)...
03e9515 
Update automate.py - disable NACL and use sysroot, as per instructions
in cef/AutomatedBuildSetup.md.

Disable sandboxing for the subprocesses.

Update build-instructions for Linux.
@cztomczak
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Fixed in 03e9515

@cztomczak cztomczak added this to the Chrome 51 milestone Jun 28, 2016
jegger pushed a commit to rentouch/cefpython that referenced this issue Jun 29, 2016
@cztomczak
Update to CEF 3.2526.1373.gb660893 (Chrome 47)...
bc3b9aa 
It builds fine on Linux, however there is an error when running during import
of the cefpython .so module (Issue cztomczak#230).

Upstream CEF binaries and libraries are available for download from the
GH releases tagged 'v47-upstream'.

Changes in upstream CEF that break backward compatibility:
* Add Browser.NotifyMoveOrResizeStarted() - requires changes in examples,
  needs to be called in MOVE/SIZE window operations
* On Linux the windowRect argument in WindowInfo.SetAsChild() is now required
* When using offscreen rendering you must set the ApplicationSettings >
  "windowless_rendering_enabled" option to True
* New args in LifespanHandler.OnBeforePopup() - targetDisposition
  and userGesture - wxpython.py example updated
* New arg in RequestHandler.OnResourceRedirect() - request object, updated
  the wxpython.py example

Other changes in API:
* Change ApplicationSettings. Add new: user_data_path,
  windowless_rendering_enabled, persist_user_preferences, accept_language_list.
  Modify: background_color is now cross-platform (previously it was Mac only).
  Remove: release_dcheck_enabled - all examples updated
* Change BrowserSettings. Add new: windowless_frame_rate, background_color,
  accept_language_list. Remove: user_style_sheet_location,
  java_disabled, accelerated_compositing, author_and_user_styles_disabled.
* Add Browser.CloseDevTools()
* Remove Browser.ParentWindowWillClose()  in upstream (keep dummy for BC)
* Request.GetHeaderMap() will not include the Referer value if any
  and SetHeaderMap() will ignore Referer value
* Remove the cefpython.Request.Flags values: AllowCookies, ReportLoadTiming,
  ReportRawHeaders.
* Update descriptions of many functions and settings in API docs
* There were many more API changes in upstream, but are not yet implemented
  in cefpython. A list of changes since v31..v47 is available in the
  top comment in src/cefpython.pyx

Improve integration with PyCharm:
- add include "cefpython.pyx" in all .pyx files
- many other fixes

Set these settings in Pycharm:
- in Tool Windows > Project right click on src/cython_includes dir and
  select Mark Directory As > Mark as Sources Root
- PEP8 naming convention violation: ignored errors: N802, N803, N806
- in Inspections > unresolved references add to ignore: UNAME_SYSNAME
  and PY_MAJOR_VERSION and others that cause issues in PyCharm
- templates usage like CefRefPtr[CefApp] always shows "unresolved reference"
  error - to fix it add CefApp and others to ignore list (easy with alt+enter
  and fix single or fix all in file)

Remove duplicated comments in all C++ classes/methods that implement CEF API,
eg. client_handler.cpp and client_handler.h. Comments describing method
can be found in src/include/. Duplicating it might mislead when the comment
is not updated when updating to newer CEF.

Remove LOG macros in LOG_DEBUG.h - name conflicts with cef_logging.h
(issue cef/#1830).
cztomczak added a commit that referenced this issue Jul 2, 2016
@cztomczak
Fix printing on Linux (#238) and fix "undefined symbol" error (#230).
7d47bfe 
Fix OnBeforePluginLoad and change args, see docs.

Add -std=gnu++11 flag to catch OVERRIDE errors.

Minor enhancements to makefiles.

Update build instructions - install python dependencies to make sure
that the right version of Cython is installed (must be exactly 0.19.2).
@cztomczak
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Previous commit didn't fix the issue, it still occured on some systems. Fixed again by adding -flto and a few other flags in commit 7d47bfe.

New flags:

    extra_compile_args=['-flto', '-fdata-sections', '-ffunction-sections',
                        '-std=gnu++11'],
    extra_link_args=['-flto', '-Wl,--gc-sections'],

More details on the flags here: https://stackoverflow.com/questions/6687630/

@cztomczak cztomczak changed the title Error when importing the CEF Python 47 module: undefined symbol: _ZN3cef7logging10LogMessageC1EPKcii Error when importing the CEF Python 47 module: undefined symbol: cef::logging::LogMessage Jul 2, 2016
@cztomczak cztomczak modified the milestones: v47, Chrome 50+ Feb 24, 2017
@cztomczak cztomczak mentioned this issue Jul 30, 2017
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