I took a look, a month back, at the changes over there. Though it gave something to start, at that point in time, I saw there were more things to work upon to be able to build VirtualBox using clang/LLVM on Linux(Ubuntu) and resolve the dependencies with Qt. So, thereafter, I started my effort from scratch for this independent effort of mine.
Eventually, as of now, I have been able to successfully build VirtualBox using clang/LLVM and bring it up on Ubuntu 17.10 x86_64 with host clang-built kernel v4.16.3, along with Qt5.10.1 which as well I built using clang/LLVM for VirtualBox GUI. For that, I had to fix a whole lot of issues around VirtualBox 5.2.8 and Qt 5.10.1. I will be sharing the report next. Cheers. On Fri, Mar 16, 2018 at 3:05 AM, Bernhard Fröhlich <[email protected]> wrote: > On Fri, Mar 16, 2018 at 8:52 AM, Raghavan Santhanam > <[email protected]> wrote: > > Hello All, > > > > I wanted to know the feasibility of VirtualBox source to be built with > > Clang/LLVM on Linux. As far as I researched, tried > > and experimented so far, it turned out that there are many hard-coded > > gcc/g++-specific Makefile variables, etc which I tried > > to update beforehand via configure script. And also tried to work upon > some > > of the code that used non-standard VLAIS > > that gcc supports as an extension but clang doesn't. With that, I was > able > > to some of the code with Clang/LLVM and still > > there are some more to build that are likely to throw some more > compilation > > errors, etc due to gcc/clang extensions differences. > > I also tried to reuse the MacOS/darwin settings(as an experiment) as it > > seems to use Clang/LLVM as the compiler - but > > appeared to require more effort than using Linux(OS) specific Makefile > > settings to point to Clang/LLVM and get the build > > going. So, before proceeding further, I wanted to know if there have been > > attempts to build Virtualbox using Clang/LLVM > > on Linux for Linux. I saw an old thread discussing about the same being > > possible for FreeBSD. So, I tried to set the OS to > > be FreeBSD and get going to see how far the build can go - it failed in > the > > first few steps when it didn't find some FreeBSD > > specific settings which I had expected to happen as I am using Ubuntu > 17.10 > > x86_64 as the host to build Virtualbox using > > Clang/LLVM. So, any thoughts on this? > > > > By the way, I was successful in building all of the Virtualbox kernel > > modules(vboxpci, vboxnetadp, vboxnetfltm, vboxdrv), > > using Clang/LLVM and they are completely working as expected as I > verified > > the same by running Ubuntu 17.10 x86_64 > > as the guest within the installed Virtualbox(v5.2.8) on the same host > Ubuntu > > 17.10 x86_64 I am using for the above > > Clang/LLVM/Virtualbox/Linux building process. Below are the metadata > > embedded within these kernel modules showing > > the compiler used to build them to be Clang/LLVM along with the other > > details of host and VirtualBox guest to give a > > better context in this regard. > > > > Cheers, > > Raghavan Santhanam > > Yeah, we are building (most parts) with clang on FreeBSD since around > virtualbox > 4.3.10 so almost 4 years now. The commit back then which might give you a > good > summary of the changes is here: > > https://svnweb.freebsd.org/ports?view=revision&revision=349473 > > Beware that also includes patches that are not clang relevant. > > -- > Bernhard Fröhlich > http://www.bluelife.at/ >
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