On Mon, Jan 11, 2021 at 12:39 PM Lennart Poettering
wrote:
> https://fedoraproject.org/wiki/LTOByDefault
>
> (I think Suse is even further ahead on this)
Yes. lto is already on by default, on worthiness of t..the jury is still out..
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On Mon, Jan 11, 2021 at 06:05:26PM +0100, Michael Biebl wrote:
> Am Mo., 11. Jan. 2021 um 16:39 Uhr schrieb Lennart Poettering
> :
> > https://fedoraproject.org/wiki/LTOByDefault
>
> Interestingly, that wiki page says, that LTO should produce smaller
> binaries, which clearly isn't the case here.
Am 11.01.21 um 18:10 schrieb Michael Biebl:
Am Mo., 11. Jan. 2021 um 18:07 Uhr schrieb Reindl Harald
:
it don't make sense using different flags in CI and production builds,
especially LTO which often points out otherwise unvisible bugs
Such as? I don't remember any bug report which was
Am 11.01.21 um 16:05 schrieb Michael Biebl:
Am Mo., 11. Jan. 2021 um 15:42 Uhr schrieb Reindl Harald
:
it shouldn't if properly used - means param with cpu-cores, just -flto
alone is terrible slow
-flto=%(nproc)
%{__make} %{?_smp_mflags}
The package uses meson's -Db_lto=true
export
Am 11.01.21 um 18:05 schrieb Michael Biebl:
Am Mo., 11. Jan. 2021 um 16:39 Uhr schrieb Lennart Poettering
:
https://fedoraproject.org/wiki/LTOByDefault
Interestingly, that wiki page says, that LTO should produce smaller
binaries, which clearly isn't the case here.
I wonder whether the wiki
Am 11.01.21 um 15:34 schrieb Michael Biebl:
we've been using LTO in the Debian build for as long as I can
remember, but I begin to question whether that is a good idea.
On Debian sid (gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU
Binutils for Debian) 2.35.1),
an LTO build almost takes
On Mo, 11.01.21 18:05, Michael Biebl (mbi...@gmail.com) wrote:
> Concerning the build speed: I wonder whether at least disabling LTO on
> our CI would make sense. We don't really care for fast/small
> executables there.
So, systemd's testsuite is certainly not supposed to be a testsuite
for
Am Mo., 11. Jan. 2021 um 18:26 Uhr schrieb Reindl Harald
:
> Am 11.01.21 um 18:10 schrieb Michael Biebl:
> > Am Mo., 11. Jan. 2021 um 18:07 Uhr schrieb Reindl Harald
> > :
> >> it don't make sense using different flags in CI and production builds,
> >> especially LTO which often points out
Am Mo., 11. Jan. 2021 um 18:10 Uhr schrieb Michael Biebl :
>
> Am Mo., 11. Jan. 2021 um 18:07 Uhr schrieb Reindl Harald
> :
> > it don't make sense using different flags in CI and production builds,
> > especially LTO which often points out otherwise unvisible bugs
>
> Such as? I don't remember
Am Mo., 11. Jan. 2021 um 18:07 Uhr schrieb Reindl Harald
:
> it don't make sense using different flags in CI and production builds,
> especially LTO which often points out otherwise unvisible bugs
Such as? I don't remember any bug report which was uncovered by LTO
being enabled.
Am Mo., 11. Jan. 2021 um 16:39 Uhr schrieb Lennart Poettering
:
> https://fedoraproject.org/wiki/LTOByDefault
Interestingly, that wiki page says, that LTO should produce smaller
binaries, which clearly isn't the case here.
I wonder whether the wiki is incorrect or whether this is a toolchain
Am Mo., 11. Jan. 2021 um 16:12 Uhr schrieb Reindl Harald
:
> export LDFLAGS="-Wl,--as-needed -Wl,-z,now -Wl,-z,relro -pie %{optflags}
> -flto=%(nproc)"
> %meson
Thanks for the hint. I tried it, but it didn't really help.
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On Mo, 11.01.21 15:34, Michael Biebl (mbi...@gmail.com) wrote:
> Hi,
>
> we've been using LTO in the Debian build for as long as I can
> remember, but I begin to question whether that is a good idea.
> On Debian sid (gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU
> Binutils for Debian)
Am Mo., 11. Jan. 2021 um 15:42 Uhr schrieb Reindl Harald
:
> it shouldn't if properly used - means param with cpu-cores, just -flto
> alone is terrible slow
>
> -flto=%(nproc)
> %{__make} %{?_smp_mflags}
The package uses meson's -Db_lto=true
___
Hi,
we've been using LTO in the Debian build for as long as I can
remember, but I begin to question whether that is a good idea.
On Debian sid (gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU
Binutils for Debian) 2.35.1),
an LTO build almost takes twice as long as a no-LTO build.
I also
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