musl - Compile gcc-12 with musl and report errors

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Date: Mon, 13 Feb 2023 20:17:10 +0800 (GMT+08:00)
From: 花静云 <huajingyun@...ngson.cn>
To: musl@...ts.openwall.com
Subject: Compile gcc-12 with musl and report errors

Hi：
   I installed the Alpine Linux system on the x86_64 platform, and exposed a problem when compiling gcc 12 using musl (master branch) in this system：
/usr/lib/gcc/x86_64-alpine-linux-musl/12.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: d/common-outbuffer.o: in function `_D3dmd6common4file__T11FileMappingThZQq6__ctorMFNbNcxPaZSQCdQCcQBy__TQBwThZQCc':
outbuffer.d:(.text+0x29f): undefined reference to `mmap64'

I uploaded more detailed logs to gcc_ build_ Error.log file，and other information is as follows：
1、linux-lts（kernel）version：6.1.10-r0
2、gcc version：12.2.1_git20220924-r9
3、binutils version：binutils-2.40-r4
4、musl：master branch and commit is f47a8cdd250d9163fcfb39bf4e9d813957c0b187

I suspect that the error is caused by the difference of the musl code，When I checked musl source, I found that there was a big difference between the master branch code and the v1.2.3 version code. For example, a large number of weaks_alias were removed during the 246f1c811448f37a44b41cd8df8d0ef9736d95f4 commit，include “weak_alias(mmap, mmap64);” in src/mman/mmap.c.

I want to compile gcc 12 based on musl (master branch). and I try to apply the old code to the latest branch, but this seems to be not a wise choice. so I share this error and look forward to some suggestions from the community experts.

I'm Looking forward to your reply,thanks.

Jingyun Hua

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