gccgo: cross compiling with GCC11.1 cause many undefined reference #45843
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Did you build gccgo yourself? In your build directory, what is the contents of the generated file sparcv9-sun-solaris2.11/libgo/runtime_linknames.go? Thanks. |
ianlancetaylor
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Yes I'm build gcc by myself and here you are content of sparcv9-sun-solaris2.11/libgo/runtime_linknames.go root@d3fc663ba707:/tmp/tmp.x6cBnklrDH# cat sparcv9-sun-solaris2.11/libgo/runtime_linknames.go // Code generated by mklinknames.awk. DO NOT EDIT. package runtime import _ "unsafe" //go:linkname libcPipe pip //go:linkname libcPipe2 pipe //go:linkname sigaction sigactio //go:linkname sigprocmask sigprocmas //go:linkname sigfillset sigfillse //go:linkname sigemptyset sigemptyse //go:linkname c_sigaddset sigaddse //go:linkname c_sigdelset sigdelse //go:linkname sigaltstack sigaltstac //go:linkname raise rais //go:linkname getpid getpi //go:linkname kill kil //go:linkname setitimer setitime //go:linkname exit exi |
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Thanks. That file is generated by libgo/mklinknames.awk, and clearly it is not working. But I don't see why. What version of awk do you have installed? What do you see if you run |
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I was compile gcc in docker build base on buildpack-deps:buster root@e815928baf27:/tmp/tmp.x6cBnklrDH# grep sigaltstack sparcv9-sun-solaris2.11/libgo/gen-sysinfo.go
type _sigaltstack struct { ss_sp *byte; ss_size uint64; ss_flags int32; Godump_0_pad [4]byte; }
const _sizeof_sigaltstack = 24
type _stack_t _sigaltstack
func _sigaltstack (*_stack_t, *_stack_t) int32 __asm__("sigaltstack")
const _SYS_sigaltstack = 97
and awk version root@e815928baf27:/tmp/tmp.x6cBnklrDH# awk -W version mawk 1.3.3 Nov 1996, Copyright (C) Michael D. Brennan compiled limits: max NF 32767 sprintf buffer 2040 |
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tl;dr: Check the binutils version used when linking go object files I encountered the very same problem without cross compiling today. Unfortunately, I do not have access to the log files right now, but here is how to replicate it:
The result is a very similar error as above. The failing step was the compilation of some go tools. When I tried to dig into it, it looked like all references had one letter cut off. I digged further and what I found was that collect2 was running /usr/bin/ld instead of the one bootstrapped from the binutils. Now I am not an expert regarding the build/bootstrap/cross compilation process and it might be that I missed some environment variables when digging, so take this with a grain of salt. But I am 100% certain that the same build script worked just fine on fedora 33 and I think it also passed on ubuntu 20.04 - so the older version of binutils seems to be related. I think gcc upgraded some internal formats (DWARF?) and the older binutils cannot cope with that. |
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My last comment is not the root cause. The cause is in the mklinknames.awk script. It contains the following line: That 0 should be a 1 according to I will try to come up with a patch. Where do I submit it, if it works? |
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Here is the patch I used to fix the build problem. @bearx3f you might want to give it a try. I tried to upstream it, but somehow I cannot send to gcc-patches@gcc.gnu.org . (The changelog part might not apply to the 11.1.0 release tarball, just delete it, it doesn't matter). |
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@ianlancetaylor I confirm that @choeger's solution works
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@choeger I think here https://github.com/golang/gofrontend is proper way to submit patch |
The awk script used a zero-based index which worked on surprisingly many plattforms. According to the man page, however, the function expects one-based indexing. For reference see this bug in the go git repository: golang/go#45843 Signed-off-by: Christoph Höger <choeger@umpa-net.de>
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@ianlancetaylor maybe my problem is all about awk version problem version root@e815928baf27:/tmp/tmp.x6cBnklrDH# awk -W version mawk 1.3.3 Nov 1996, Copyright (C) Michael D. Brennan compiled limits: max NF 32767 sprintf buffer 2040 success version apt-get install gawk root@d772f8344b47:/go# awk -W version GNU Awk 4.2.1, API: 2.0 (GNU MPFR 4.0.2, GNU MP 6.1.2) Copyright (C) 1989, 1991-2018 Free Software Foundation. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the. GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/. my issue is closed. |
What version of Go are you using (
go version)?Does this issue reproduce with the latest release?
yes
What operating system and processor architecture are you using (
go env)?go envOutputWhat did you do?
compile go with gccgo
I'm guessing link func name is missing last character
sparcv9-sun-solaris2.11-ld -vOutputgccgo -vOutputWhat did you expect to see?
successfully compile
What did you see instead?
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