Hei hei,

Am Thu, Nov 17, 2022 at 03:52:18PM +0100 schrieb Felix Mellmann:
> On 17.11.22 08:45, Michael Olbrich wrote:
> > On Wed, Nov 16, 2022 at 06:40:02PM +0100, Christian Melki wrote:
> > > On 11/16/22 15:08, Felix Mellmann wrote:
> > > > On 16.11.22 08:17, Michael Olbrich wrote:
> > > > > On Sun, Nov 13, 2022 at 06:32:01PM +0100, Felix Mellmann wrote:
> > > > > > I've just run into a linker problem when building e2fsprogs 1.46.5 using
> > > > > > OSELAS.Toolchain 2022.10.0 (arm-v7a-linux-gnueabihf):
> > > > > > 
> > > > > > 
> > > > > > -------------------------
> > > > > > target: e2fsprogs.compile
> > > > > > -------------------------
> > > > > > 
> > > > > > make: Entering directory
> > > > > > '/PTXdist/BSP/platform-imx6/build-target/e2fsprogs-1.46.5'
> > > > > > cd ./util ; make subst
> > > > > > make[1]: Entering directory
> > > > > > '/PTXdist/BSP/platform-imx6/build-target/e2fsprogs-1.46.5/util'
> > > > > >       CREATE dirpaths.h
> > > > > >       CC subst.c
> > > > > >       LD subst
> > > > > > lto1: fatal error: bytecode stream in file 'subst.o' generated with LTO
> > > > > > version 11.2 instead of the expected 11.3
> > > > > > compilation terminated.
> > > > > > lto-wrapper: fatal error: /usr/bin/gcc returned 1 exit status
> > > > > > compilation terminated.
> > > > > > /usr/bin/ld: error: lto-wrapper failed
> > > > > > collect2: error: ld returned 1 exit status
> > > > > > make[1]: *** [Makefile:369: subst] Error 1
> > > > > > make[1]: Leaving directory
> > > > > > '/PTXdist/BSP/platform-imx6/build-target/e2fsprogs-1.46.5/util'
> > > > > > make: *** [Makefile:194: util/subst] Error 2
> > > > > > make: Leaving directory
> > > > > > '/PTXdist/BSP/platform-imx6/build-target/e2fsprogs-1.46.5'
> > > > > > make: ***
> > > > > > [/usr/local/lib/ptxdist-2022.11.0/rules/post/ptxd_make_world_compile.make:20:
> > > > > > /PTXdist/BSP/platform-imx6/state/e2fsprogs.compile] Error 2
> > > > > > 
> > > > > > The error vanishes if ./configure is called with "--disable-lto" instead of
> > > > > > "--enable-lto".
> > > > > > 
> > > > > > As I'm no expert at this level, I hope anyone could put some hints about the
> > > > > > issue.
> > > > > Is this a clean build? I've not seen this here with the same toolchain and
> > > > > the error looks like you're mixing compiler versions.
> > > > It was a clean build, yes. But finally - ccache messed it up. After
> > > > clearing the cache the build was successful.
> > > > 
> > > > Well I should loose my trust in ccache ... Please drop my patch.
> > > > 
> > > I still think that LTO should not be enabled per project like that.
> > It's a good point. So I may apply the patch with a modified commit message.
> > I'm not sure yet.
> > 
> > > Regardless if it's working or not.
> > > A global for LTO would be much better.
> > Sneaking it in via compiler wrappers does not work. It breaks quite a few
> > packages (I tried that some time ago). But maybe a global option that
> > selected packages can use to enable it conditionally.
> 
> Grepping through the packages reveals, that 8 packages explicitly disable
> LTO and only e2fsprogs enables LTO. For the rest I'm unsure about the
> defaults. So what should a global LTO option look like and what should be
> the consequences? (i.e. replace all the enable/disable-lto with the global
> option? Enforce a setting for all packages not configuring a default?)
> 
> @Michael: you propose that I should resend the patch with a different commit
> message? Do you have a proposal? I really don't have a clue why LTO is
> enabled for this peculiar package and its consequences and I unfortunately
> run into a random ccache issue ..

According to `git blame rules/e2fsprogs.make` that option was added
with commit 471f5e0889e7 ("e2fsprogs: version bump 1.44.4 -> 1.44.6")
in 2020, but the commit message is rather generic.

Greets
Alex

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