Re: [PATCH] compiler/gcc: Raise minimum GCC version for kernel builds to 4.8
From: Nick Desaulniers
Date: Tue May 26 2020 - 12:08:47 EST
On Tue, May 26, 2020 at 9:03 AM Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
> Hi Nick,
> On 5/26/20 8:40 AM, Nick Desaulniers wrote:
> > On Tue, May 26, 2020 at 8:30 AM Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
> >> On Mon, May 11, 2020 at 09:41:37PM +0100, Will Deacon wrote:
> >>> It is very rare to see versions of GCC prior to 4.8 being used to build
> >>> the mainline kernel. These old compilers are also known to have codegen
> >>> issues which can lead to silent miscompilation:
> >>> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145
> >>> Raise the minimum GCC version to 4.8 for building the kernel and remove
> >>> some tautological Kconfig dependencies as a consequence.
> >> My hexagon compiler is v4.6.1, and I have been unable to find a more
> >> recent version. Does anyone happen to have a pointer to a hexagon toolchain
> >> with gcc 4.8 or later ?
> > IIUC, hexagon moved to LLVM, though that target still has issues
> > building the kernel.
> > https://github.com/ClangBuiltLinux/linux/issues?q=is%3Aopen+is%3Aissue+label%3A%22%5BARCH%5D+hexagon%22
> That won't help me for my build tests. It is bad enough having to maintain
> one compiler. I don't want to add another one to the mix, and I'll happily
> leave llvm build tests for ClangBuiltLinux. Guess I'll have to stop hexagon
:( We could use the additional test coverage.
> test builds starting with 5.8.