Package: gcc-16
Version: 16-20260425-1
Severity: normal
X-Debbugs-Cc: [email protected]
-- System Information:
Debian Release: forky/sid
APT prefers unstable
APT policy: (1001, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Kernel: Linux 7.1.0-rc2-next-20260506-master (SMP w/32 CPU threads; PREEMPT)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=C.UTF-8 (charmap=locale: Cannot set
LC_MESSAGES to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory
UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: unable to detect
Versions of packages gcc-16 depends on:
ii binutils 2.46-3
ii cpp-16 16-20260425-1
ii gcc-16-base 16-20260425-1
ii gcc-16-x86-64-linux-gnu 16-20260425-1
Versions of packages gcc-16 recommends:
ii libc6-dev 2.42-16
Versions of packages gcc-16 suggests:
pn gcc-16-doc <none>
pn gcc-16-locales <none>
pn gcc-16-multilib <none>
-- debconf information excluded
When compiling linux-7.0.4 with module (allmodconfig) gcc-16 takes
~18.5min, while using gcc-{14.15} only takes ~11.25min.
Steps to reproduce:
1. Unpack linux-7.0.4.tar.xz (from kernel.org)
2. Apply this patch (otherwise compilation with gcc-16 fails)
https://lore.kernel.org/all/[email protected]/
3. Either install gcc from experimental or point the /usr/bin/{gcc,cpp}
symlinks to {gcc,cpp}-16 (using CC=gcc-16 does not work)
4. Compile with
$ make allmodconfig
$ time LANG=C make -j32
5. Wait for more than 18 minutes
A test with gcc-16.1.1 20260430 (in a cachyos chroot) shows no
performancee regression when compiling linux-7.0.4.
Bert Karwatzki
