Build fails with LLVM/clang

[qumaciel]

Hi, I'm trying to build lxqt from souce (following this instructions) using LLVM/clang.

I've managed to build everything except from qtermwidget.

I have a Arch-based distro and I'm parting from the PKGBUILD from
qtermwidget-git AUR
pointing CC/CXX to clang.

Current Behavior

Here is the output I get when trying to build with clang

$ makepkg -csi
==> Making package: qtermwidget-git 0.17.0.23.g68a019e-1 (sáb 25 set 2021 10:50:06)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Retrieving sources...
  -> Updating qtermwidget git repo...
Fetching origin
==> Validating source files with sha256sums...
    qtermwidget ... Skipped
==> Extracting sources...
  -> Creating working copy of qtermwidget git repo...
Cloning into 'qtermwidget'...
done.
==> Starting pkgver()...
==> Starting build()...
-- The C compiler identification is Clang 12.0.1
-- The CXX compiler identification is Clang 12.0.1
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/clang - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/clang++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Keyboard layouts will be installed in: /usr/share/qtermwidget5/kb-layouts
-- Color schemes will be installed in: /usr/share/qtermwidget5/color-schemes
-- Translations will be installed in: /usr/share/qtermwidget5/translations
-- Looking for updwtmpx
-- Looking for updwtmpx - found
-- Performing Test COMPILER_HAS_HIDDEN_VISIBILITY
-- Performing Test COMPILER_HAS_HIDDEN_VISIBILITY - Success
-- Performing Test COMPILER_HAS_HIDDEN_INLINE_VISIBILITY
-- Performing Test COMPILER_HAS_HIDDEN_INLINE_VISIBILITY - Success
-- Performing Test COMPILER_HAS_DEPRECATED_ATTR
-- Performing Test COMPILER_HAS_DEPRECATED_ATTR - Success
-- Found PythonInterp: /usr/bin/python (found version "3.9.7") 
-- Found PythonLibs: /usr/lib/libpython3.9.so (found version "3.9.7") 
-- Python system site-packages directory: /usr/lib/python3.9/site-packages
-- Found PythonLibrary: /usr/lib/libpython3.9.so  
-- Found SIP version: 4.19.25
-- Found PyQt5 version: 5.15.4
-- Configuring done
-- Generating done
-- Build files have been written to: lxqt/08-qtermwidget-git/src/build
[  1%] Generating ui_SearchBar.h
[  2%] Generating lib/moc_Emulation.cpp
[  3%] Generating lib/moc_Filter.cpp
[  4%] Generating lib/moc_HistorySearch.cpp
[  5%] Generating lib/moc_Pty.cpp
[  6%] Generating lib/moc_ScreenWindow.cpp
[  7%] Generating lib/moc_SearchBar.cpp
[  8%] Generating lib/moc_Session.cpp
[  9%] Generating lib/moc_TerminalDisplay.cpp
[ 10%] Generating lib/moc_Vt102Emulation.cpp
[ 11%] Generating lib/moc_kprocess.cpp
[ 13%] Generating lib/moc_kptydevice.cpp
[ 14%] Generating lib/moc_kptyprocess.cpp
[ 15%] Generating lib/moc_qtermwidget.cpp
[ 16%] Generating qtermwidget_arn.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_arn.qm'...
    Generated 0 translation(s) (0 finished and 0 unfinished)
    Ignored 28 untranslated source text(s)
[ 17%] Generating qtermwidget_ast.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_ast.qm'...
    Generated 0 translation(s) (0 finished and 0 unfinished)
    Ignored 28 untranslated source text(s)
[ 18%] Generating qtermwidget_bg.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_bg.qm'...
    Generated 28 translation(s) (28 finished and 0 unfinished)
[ 19%] Generating qtermwidget_ca.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_ca.qm'...
    Generated 21 translation(s) (21 finished and 0 unfinished)
    Ignored 7 untranslated source text(s)
[ 20%] Generating qtermwidget_cs.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_cs.qm'...
    Generated 28 translation(s) (28 finished and 0 unfinished)
[ 21%] Generating qtermwidget_cy.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_cy.qm'...
    Generated 21 translation(s) (21 finished and 0 unfinished)
    Ignored 7 untranslated source text(s)
[ 22%] Generating qtermwidget_da.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_da.qm'...
    Generated 28 translation(s) (28 finished and 0 unfinished)
[ 23%] Generating qtermwidget_de.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_de.qm'...
    Generated 28 translation(s) (28 finished and 0 unfinished)
[ 25%] Generating qtermwidget_el.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_el.qm'...
    Generated 28 translation(s) (28 finished and 0 unfinished)
[ 26%] Generating qtermwidget_es.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_es.qm'...
    Generated 28 translation(s) (28 finished and 0 unfinished)
[ 27%] Generating qtermwidget_et.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_et.qm'...
    Generated 28 translation(s) (28 finished and 0 unfinished)
[ 28%] Generating qtermwidget_fr.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_fr.qm'...
    Generated 28 translation(s) (28 finished and 0 unfinished)
[ 29%] Generating qtermwidget_gl.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_gl.qm'...
    Generated 21 translation(s) (21 finished and 0 unfinished)
    Ignored 7 untranslated source text(s)
[ 30%] Generating qtermwidget_he.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_he.qm'...
    Generated 28 translation(s) (28 finished and 0 unfinished)
[ 31%] Generating qtermwidget_hr.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_hr.qm'...
    Generated 28 translation(s) (28 finished and 0 unfinished)
[ 32%] Generating qtermwidget_hu.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_hu.qm'...
    Generated 28 translation(s) (28 finished and 0 unfinished)
[ 33%] Generating qtermwidget_it.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_it.qm'...
    Generated 28 translation(s) (28 finished and 0 unfinished)
[ 34%] Generating qtermwidget_ja.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_ja.qm'...
    Generated 28 translation(s) (28 finished and 0 unfinished)
[ 35%] Generating qtermwidget_lt.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_lt.qm'...
    Generated 28 translation(s) (28 finished and 0 unfinished)
[ 36%] Generating qtermwidget_nb_NO.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_nb_NO.qm'...
    Generated 28 translation(s) (28 finished and 0 unfinished)
[ 38%] Generating qtermwidget_nl.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_nl.qm'...
    Generated 28 translation(s) (28 finished and 0 unfinished)
[ 39%] Generating qtermwidget_pl.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_pl.qm'...
    Generated 21 translation(s) (21 finished and 0 unfinished)
    Ignored 7 untranslated source text(s)
[ 40%] Generating qtermwidget_pt.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_pt.qm'...
    Generated 28 translation(s) (28 finished and 0 unfinished)
[ 41%] Generating qtermwidget_pt_BR.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_pt_BR.qm'...
    Generated 28 translation(s) (28 finished and 0 unfinished)
[ 42%] Generating qtermwidget_ru.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_ru.qm'...
    Generated 28 translation(s) (28 finished and 0 unfinished)
[ 43%] Generating qtermwidget_si.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_si.qm'...
    Generated 0 translation(s) (0 finished and 0 unfinished)
    Ignored 28 untranslated source text(s)
[ 44%] Generating qtermwidget_sk.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_sk.qm'...
    Generated 28 translation(s) (28 finished and 0 unfinished)
[ 45%] Generating qtermwidget_tr.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_tr.qm'...
    Generated 28 translation(s) (28 finished and 0 unfinished)
[ 46%] Generating qtermwidget_uk.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_uk.qm'...
    Generated 28 translation(s) (28 finished and 0 unfinished)
[ 47%] Generating qtermwidget_zh_CN.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_zh_CN.qm'...
    Generated 28 translation(s) (28 finished and 0 unfinished)
[ 48%] Generating qtermwidget_zh_TW.qm
Updating 'lxqt/08-qtermwidget-git/src/build/qtermwidget_zh_TW.qm'...
    Generated 21 translation(s) (21 finished and 0 unfinished)
    Ignored 7 untranslated source text(s)
[ 50%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/BlockArray.cpp.o
[ 51%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/ColorScheme.cpp.o
[ 52%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/Emulation.cpp.o
[ 53%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/Filter.cpp.o
[ 54%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/History.cpp.o
[ 55%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/HistorySearch.cpp.o
[ 56%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/KeyboardTranslator.cpp.o
[ 57%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/konsole_wcwidth.cpp.o
[ 58%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/kprocess.cpp.o
[ 59%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/kpty.cpp.o
[ 60%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/kptydevice.cpp.o
[ 61%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/kptyprocess.cpp.o
[ 63%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/Pty.cpp.o
[ 64%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/qtermwidget.cpp.o
[ 65%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/Screen.cpp.o
[ 66%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/ScreenWindow.cpp.o
[ 67%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/SearchBar.cpp.o
[ 68%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/Session.cpp.o
[ 69%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/ShellCommand.cpp.o
[ 70%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/TerminalCharacterDecoder.cpp.o
[ 71%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/TerminalDisplay.cpp.o
[ 72%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/tools.cpp.o
[ 73%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/Vt102Emulation.cpp.o
[ 75%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/moc_Emulation.cpp.o
[ 76%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/moc_Filter.cpp.o
[ 77%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/moc_HistorySearch.cpp.o
[ 78%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/moc_kprocess.cpp.o
[ 79%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/moc_kptydevice.cpp.o
[ 80%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/moc_kptyprocess.cpp.o
[ 81%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/moc_Pty.cpp.o
[ 82%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/moc_qtermwidget.cpp.o
[ 83%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/moc_ScreenWindow.cpp.o
[ 84%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/moc_SearchBar.cpp.o
[ 85%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/moc_Session.cpp.o
[ 86%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/moc_TerminalDisplay.cpp.o
[ 88%] Building CXX object CMakeFiles/qtermwidget5.dir/lib/moc_Vt102Emulation.cpp.o
[ 89%] Linking CXX shared library libqtermwidget5.so
[ 89%] Built target qtermwidget5
Byte-compiling lxqt/08-qtermwidget-git/src/build/pyqt//__init__.py to lxqt/08-qtermwidget-git/src/build/pyqt//__pycache__/__init__.cpython-39.pyc
[ 89%] Built target __home_maciel_Downloads_Software_lxqt_08-qtermwidget-git_src_build_pyqt____pycache_____init__.cpython-39.pyc
[ 90%] Generating sip/sipQTermWidgetpart0.cpp, sip/sipQTermWidgetpart1.cpp, sip/sipQTermWidgetpart2.cpp, sip/sipQTermWidgetpart3.cpp, sip/sipQTermWidgetpart4.cpp, sip/sipQTermWidgetpart5.cpp, sip/sipQTermWidgetpart6.cpp, sip/sipQTermWidgetpart7.cpp                                                                                                             

[ 91%] Building CXX object pyqt/CMakeFiles/python_module_QTermWidget.dir/sip/sipQTermWidgetpart0.cpp.o
In file included from lxqt/08-qtermwidget-git/src/qtermwidget/pyqt/sip/qtermwidget.sip:14:
In file included from lxqt/08-qtermwidget-git/src/qtermwidget/pyqt/../lib/qtermwidget.h:26:
lxqt/08-qtermwidget-git/src/qtermwidget/lib/Filter.h:296:7: error: visibility does not match previous declaration
class QTERMWIDGET_NO_EXPORT FilterObject : public QObject
      ^
lxqt/08-qtermwidget-git/src/build/lib/qtermwidget_export.h:20:50: note: expanded from macro 'QTERMWIDGET_NO_EXPORT'
#    define QTERMWIDGET_NO_EXPORT __attribute__((visibility("hidden")))
                                                 ^
lxqt/08-qtermwidget-git/src/qtermwidget/pyqt/sip/qtermwidget.sip:4:13: note: previous attribute is here
#pragma GCC visibility push(default)
            ^
1 error generated.                                                                                                     
make[2]: *** [pyqt/CMakeFiles/python_module_QTermWidget.dir/build.make:104: pyqt/CMakeFiles/python_module_QTermWidget.dir/sip/sipQTermWidgetpart0.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:181: pyqt/CMakeFiles/python_module_QTermWidget.dir/all] Error 2
make: *** [Makefile:136: all] Error 2
==> ERROR: A failure occurred in build().
    Aborting...

Possible Solution

I've tried to add "-fvisibility=hidden" to the flags, but no luck there

Steps to Reproduce (for bugs)

1. Usual AUR build pointing CC/CXX to clang

Context

No big deal here, I'm just trying to build everything with clang.

System Information

• Distribution & Version: Garuda
• Kernel: 5.14.7-zen1-1-zen
• Qt Version: 5.15
• lxqt-build-tools Version: git
• Package version: git

[iamthesenate1]

I can confirm this issue. I believe this is the commit that is causing the issue, specifically this part:

%ModuleHeaderCode
#pragma GCC visibility push(default)
%End

For a better explanation you can read this bug report.

Edit: While doing more research on this matter I'm starting to believe that this might be a clang bug after all....

[yan12125]

Oops, I created a fix some time ago and forgot about it 06cdf87

this might be a clang bug after all....

Maybe. The good news is there is a simple fix.