Bug 10531

Summary: QtWebengine doesn't build if the host hasn't a 32 bits C++ compiler working
Product: buildroot Reporter: Pierre Ducroquet <pinaraf>
Component: OtherAssignee: unassigned
Status: RESOLVED FIXED    
Severity: normal CC: buildroot, yann.morin.1998
Priority: P5    
Version: unspecified   
Target Milestone: ---   
Hardware: All   
OS: Linux   
Host: Target:
Build:

Description Pierre Ducroquet 2017-11-29 15:49:24 UTC 
When trying to build QtWebEngine for a raspberry pi 3 (ARM 32bits), a bunch of host tools are built using C++. Instead of being built directly for my amd64 arch, they are built for x86.
My debian sid installation was incomplete, I had gcc-multilib only and was missing at least libstdc++-7-dev:i386 and g++-multilib.
A warning from buildroot would be nice since this error occurs after a quite long build time.


As discussed on IRC :
<gportay> kos_tom: Do you prefer to add a BR2_HOSTARCH_NEEDS_IA32_CXX_COMPILER; or BR2_HOSTARCH_NEEDS_IA32_COMPILER checks for both c and c++ multilib support?
<kos_tom> gportay: that is a good question :-)
<kos_tom> I would say keep it simple, and just test for C++ support in BR2_HOSTARCH_NEEDS_IA32_COMPILER
<gportay> kos_tom: because we do not really want for force installation of c++ multilib when not needed
<gportay> okay
<kos_tom> but don't hesitate to raise this point in a note in your commit log, so that others can comment


Thanks to you guys for the support on IRC :)
Comment 1 Pierre Ducroquet 2017-11-29 15:50:20 UTC 
Corresponding Qt bug : https://bugreports.qt.io/browse/QTBUG-64869
Comment 2 Yann E. MORIN 2017-11-29 16:12:13 UTC 
More globally: qt5webengine will build host tools that are the
same bitness as the target, so it is not possible to build for
a 64-bit target on a 32-bit host.
Comment 3 Thomas Petazzoni 2018-01-10 21:00:11 UTC 
There's a patch for this waiting in patchwork: http://patchwork.ozlabs.org/patch/842670/.