[gcc r13-4261] maintainer-scripts/gcc_release: compress xz in parallel

[Richard Sandiford <rsandifo@gcc.gnu.org>]

https://gcc.gnu.org/g:2650b6f9147c0d855c2763610b8a4bff18f5b5e0

commit r13-4261-g2650b6f9147c0d855c2763610b8a4bff18f5b5e0
Author: Sam James <sam@gentoo.org>
Date:   Tue Nov 8 07:14:38 2022 +0000

    maintainer-scripts/gcc_release: compress xz in parallel
    
    1. This should speed up decompression for folks, as parallel xz
       creates a different archive which can be decompressed in parallel.
    
       Note that this different method is enabled by default in a new
       xz release coming shortly anyway (>= 5.3.3_alpha1).
    
       I build GCC regularly from the weekly snapshots
       and so the decompression time adds up.
    
    2. It should speed up compression on the webserver a bit.
    
       Note that -T0 won't be the default in the new xz release,
       only the parallel compression mode (which enables parallel
       decompression).
    
       -T0 detects the number of cores available.
    
       So, if a different number of threads is preferred, it's fine
       to set e.g. -T2, etc.
    
    Signed-off-by: Sam James <sam@gentoo.org>
    
            * gcc_release (XZ): Add -T0.

Diff:
---
 maintainer-scripts/gcc_release | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/maintainer-scripts/gcc_release b/maintainer-scripts/gcc_release
index 2456908d716..962b8efe99a 100755
--- a/maintainer-scripts/gcc_release
+++ b/maintainer-scripts/gcc_release
@@ -609,7 +609,7 @@ FILE_LIST=""
 # Programs we use.
 
 BZIP2="${BZIP2:-bzip2}"
-XZ="${XZ:-xz --best}"
+XZ="${XZ:-xz -T0 --best}"
 CVS="${CVS:-cvs -f -Q -z9}"
 DIFF="${DIFF:-diff -Nrcpad}"
 ENV="${ENV:-env}"