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Details

Type: Bug
Resolution: Unresolved
Priority: P4: Low
Fix Version/s: None
Affects Version/s: 5.15.2
Component/s: Shiboken
Labels:
None
Environment:
qt 5.15.2, PySide Qt 5.15.2, clang 11.0

Platform/s:

Linux/X11
Epic Link:
Support Qt for Python on Embedded

Description

Using shiboken2 to generate python's binding for Qt (pyside) fails if crossbuild is requested.

This happens for some target platform like `arm7l-glibc`, because shiboken2 calls the crossbuild clang compiler as expected, but it fails: see log below.

(full build log here: https://github.com/void-linux/void-packages/pull/26962/checks?check_run_id=1584350893)

[ 1%] Building CXX object libpyside/CMakeFiles/pyside2.dir/globalreceiverv2.cpp.o 
 
qt.shiboken: (core) CLANG builtins includes directory: /usr/armv7l-linux-gnueabihf/usr/lib/clang/11.0.0/include 
 
(core) clang_parseTranslationUnit2(0x0, cmd[14]=-isystem/usr/armv7l-linux-gnueabihf/usr/lib/clang/11.0.0/include -fPIC -Wno-constant-logical-operand -std=c++14 
-I/builddir/pyside-setup-opensource-src-5.15.2/sources/pyside2/PySide2 -I/usr/armv7l-linux-gnueabihf/usr/include/qt5 -I/usr/armv7l-linux-gnueabihf/usr/include/qt5 
-I/usr/armv7l-linux-gnueabihf/usr/include/qt5/QtCore -I/usr/armv7l-linux-gnueabihf/usr/lib/qt5/mkspecs/linux-g++ 
-I/usr/armv7l-linux-gnueabihf/usr -I/usr/armv7l-linux-gnueabihf/usr/include /tmp/QtCore_global_cqCVQJ.hpp 
"-DQT_ANNOTATE_ACCESS_SPECIFIER(a)=__attribute__((annotate(#a)))" 
"-DQT_ANNOTATE_CLASS(type,...)=static_assert(sizeof(#__VA_ARGS__),#type);") 
 
/usr/armv7l-linux-gnueabihf/usr/include/gnu/stubs.h:7:11: fatal error: 'gnu/stubs-soft.h' file not found

Unfortunately, calling the crossbuild clang compiler this way is not enough.
The error below might be fixed if specifying the target's platform to clang, like option `-target armv7l-linux-gnueabihf`.

Indeed, this makes defining specific glibc macro for this platform that is needed : defining macro ` __ARM_PCS_VFP` in this case makes `include/gnu/stubs.h` choose `gnu/stubs-hard.h` instead of `gnu/stubs-soft.h`

$ clang -target armv7l-linux-gnueabihf -dM -E - < /dev/null | grep

ARM_PCS_VFP#define __ARM_PCS_VFP 1

A workaround might be add an option to shiboken2 to pass some clang options.