Bootstrap GNAT and GDC for Debian

[xen0n]

This has been blocking Debian loong64 port's gcc-14 and various other related packages for a while now.

Steps:

• Cross-compile version 13 of GNAT and GDC for LoongArch
• Make Debian package out of it
• Ask someone to upload it to Debian-Ports
• See if things are unblocked

This issue tracks collaboration of said work.

cc @212dandan @Dandan336 (which is the primary account?)

[xen0n]

Reasons why bootstrapping is needed:

• It's well known that GNAT is written in Ada
• GDC runtime code is written in D starting from GCC 12, which unfortunately means no version of LoongArch GCC can support D without first having a D compiler

[wzssyqa]

WÁNG Xuěruì ***@***.***> 于2024年7月16日周二 14:16写道：

This has been blocking Debian loong64 port's gcc-14 and various other related packages for a while now. Steps: - Cross-compile version 13 of GNAT and GDC for LoongArch - Make Debian package out of it - Ask someone to upload it to Debian-Ports - See if things are unblocked

我来说个更详细的步骤： 1. 制作Multiarch镜像，同时装amd64和loong64的相关依赖包 这一步需要大量的脏操作，包括装包的时候强制忽略版本依赖关系等 2. 使用 dpkg-buildpackage -aloong64 来编译 此处的交叉编译分两种，一种是 --host=--build, 还有一种是 --host=--target 我之前用过几次，是可以搞出来的。 3. 在loong64上，使用第二步编译出来的包，再编译一遍。

…

This issue tracks collaboration of said work. cc @212dandan <https://github.com/212dandan> @Dandan336 <https://github.com/Dandan336> (which is the primary account?) — Reply to this email directly, view it on GitHub <#60>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AABH4CJ34FMBUAVDVIIIWODZMS3DJAVCNFSM6AAAAABK5367VWVHI2DSMVQWIX3LMV43ASLTON2WKOZSGQYTAMZQGI3TMMY> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

-- YunQiang Su

[xen0n]

@Dandan336 says https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1072635

[xen0n]

• https://salsa.debian.org/toolchain-team/gcc/-/commit/51a69c4cb22ef762904df98d744ba6af8c46b2b3
• https://salsa.debian.org/toolchain-team/gcc/-/commit/490e71ee619e091d1ee89cfa582167a7271d367c

gnat-13 was bumped to gnat-14 for loong64, but only that, missing gdc-13 which causes this bug. This will be fixed shortly.

[RevySR]

https://tracker.debian.org/news/1546039/accepted-gcc-14-1410-5-source-into-unstable/

[xen0n]

The version is stuck in Build-Attempted status. @Dandan336 says it's still caused by outdated gcc-defaults symlinking unversioned gnatmake etc. to non-existent gnat*-13.

[xen0n]

There seems to be a gnat package that needs bumping too:

• https://tracker.debian.org/pkg/gnat
• https://salsa.debian.org/debian/gnat

gcc-defaults doesn't seem to contain declarations for the gnat-* packages.

[wzssyqa]

不是的，现在的gnat只能同时装一个版本，而且自带没版本号的链接。 WÁNG Xuěruì ***@***.***> 于 2024年7月22日周一 18:26写道：

…

There seems to be a gnat package that needs bumping too: - https://tracker.debian.org/pkg/gnat - https://salsa.debian.org/debian/gnat gcc-defaults doesn't seem to contain declarations for the gnat-* packages. — Reply to this email directly, view it on GitHub <#60 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AABH4CNZTAJLWU4KQ2RXKHLZNTM3PAVCNFSM6AAAAABK5367VWVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDENBSGYYTSMBXGQ> . You are receiving this because you commented.Message ID: ***@***.***>

[xen0n]

The work is now blocked by gcc SIGILL's on builders. Likely due to too old kernels on builders (no ISA extensions support; the new gcc-14 binaries make use of LSX). Waiting for Loongson to upgrade the builders' kernels.

[xen0n]

These bugs were fixed:

• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1077776 (SIGILL due to outdated buildd kernels)
• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1078144 (missing unversioned gnatmake symlinks for bootstrapping)
• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1069714 (enable gdc and gm2 for loong64)

Now gcc-14 is fully bootstrapped on loong64, complete with GNAT and GDC. Closing 🎉