execinfo.h is not available on MUSL

V version:
OS:

What did you do?

try to build v for musl,

What did you expect to see?

a working build

What did you see instead?

a failure because the current ifndef is only for BIONIC

in fact execinfo is a gnuism, so it should be guarded like this:

#if (__linux__ && __GNU_LIBRARY__) || defined(NETBSD_WITH_BACKTRACE) || \
  defined(FREEBSD_WITH_BACKTRACE) || __DragonFly__
# include <execinfo.h>
#endif

alpineLinux has libexecinfo
don´t know about other musl based distros.

@radare

@radare Good point. Aldo the current backtrace implementation rely's on functions from it, we should have a minimal or different backtrace implementation when it isn't available (or no backtrace in that case)

@radare

@radare

Step 1/12 : FROM alpine:3.10.2
 ---> 961769676411
Step 2/12 : RUN         apk update apk upgrade &&       apk add --update gcc make       git musl-dev libexecinfo-dev    &&      mkdir -p 
/opt/v && cd /opt/v &&  git clone --quiet https://github.com/vlang/v .
 ---> Running in d45130455ecd
fetch http://dl-cdn.alpinelinux.org/alpine/v3.10/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.10/community/x86_64/APKINDEX.tar.gz
v3.10.2-189-g393dc02e8c [http://dl-cdn.alpinelinux.org/alpine/v3.10/main]
v3.10.2-189-g393dc02e8c [http://dl-cdn.alpinelinux.org/alpine/v3.10/community]
OK: 10337 distinct packages available
(1/20) Installing binutils (2.32-r0)
Step 3/12 : WORKDIR /opt/v
 ---> Running in 912eb8788caa
Removing intermediate container 912eb8788caa
 ---> 65d6a05e7ec2
Step 4/12 : RUN CC=gcc LDFLAGS=-lexecinfo make MAKE_VERBOSE=1
 ---> Running in 7b52a241035b
rm -rf vc/
git clone --depth 1 --quiet https://github.com/vlang/vc
rm -rf /var/tmp/tcc/
git clone --depth 1 --quiet https://github.com/vlang/tccbin /var/tmp/tcc
gcc -std=gnu11 -w -o v vc/v.c -lexecinfo -lm
rm -rf vc/
V has been successfully built
Removing intermediate container 7b52a241035b

Ok i manage to compile it by adding the LDFLAGS=-lexecinfo env var but then it fails to do anything because:

theres no way to add -lexecinfo when compiling with v (theres -cflags but not -ldflags)
tcc fails hard. But using -cc gcc seems to work, is there a way to force this at compile time? May be better to fix tcc anyway

tcc fails hard. But using -cc gcc seems to work, is there a way to force this at compile time?

export VFLAGS="-cc gcc"

I got tcc to work by replacing what what was put in tmp.

$ cat /var/tmp/tcc/bin/tcc 
#!/usr/bin/env bash

tcc $@ -lexecinfo

What was put in tmp for tcc by the v update process did not work for me anyways on alpine.

@bogen85

@bogen85 so tcc works with musl with -lexecinfo?

@medvednikov

@medvednikov well, compiles and links on alpine with -lexecinfo... (and a lot works) but backtrace does not... See #2508

alpineLinux has libexecinfo don´t know about other musl based distros.

With Alpine Linux 3.17, they apparently removed libexecinfo-dev

Manually building and installing https://github.com/ronchaine/libexecinfo fixes the execinfo.h error though

I just tried to compile V on chimera linux and got the following error:

clang -g -std=gnu11 -w -o v1 vc/v.c -lm -lexecinfo -lpthread 
ld: error: unable to find library -lexecinfo
clang: error: linker command failed with exit code 1 (use -v to see invocation)
*** Error code 1

After compiling and installing the libexecinfo library (repo has been archived!) the error message when compiling V changed to

Details

cc -pipe -g -std=gnu11 -w -o v1 vc/v.c -lm -lexecinfo -lpthread 
./v1 -no-parallel -o v2 -cc gcc cmd/v
================== C compilation error (from gcc): ==============
cc: /tmp/v_1000/v2.01J4S9AQENEY9DHCEQC23JYGSS.tmp.c:21879:19: error: call to undeclared function 'backtrace'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
cc:  21879 |                                 int nr_ptrs = backtrace(&buffer[0], 100);
cc:        |                                               ^
cc: /tmp/v_1000/v2.01J4S9AQENEY9DHCEQC23JYGSS.tmp.c:21886:23: error: call to undeclared function 'backtrace_symbols'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
cc:  21886 |                                 char** csymbols = backtrace_symbols(((voidptr)(&buffer[v_fixed_index(skipframes, 100)])), nr_actual_frames);
cc:        |                                                   ^
cc: /tmp/v_1000/v2.01J4S9AQENEY9DHCEQC23JYGSS.tmp.c:21886:12: error: incompatible integer to pointer conversion initializing 'char **' with an expression of type 'int' [-Wint-conversion]
cc:  21886 |                                 char** csymbols = backtrace_symbols(((voidptr)(&buffer[v_fixed_index(skipframes, 100)])), nr_actual_frames);
cc:        |                                        ^          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc: /tmp/v_1000/v2.01J4S9AQENEY9DHCEQC23JYGSS.tmp.c:29920:4: warning: expression result unused [-Wunused-value]
cc:  29920 |   (*(string*)_t3.data);
cc:        |    ^~~~~~~~~~~~~~~~~~
... (the original output was 244 lines long, and was truncated to 12 lines)
=================================================================
(You can pass `-cg`, or `-show-c-output` as well, to print all the C error messages).
builder error: 
==================
C error found. It should never happen, when compiling pure V code.
This is a V compiler bug, please report it using `v bug file.v`,
or goto https://github.com/vlang/v/issues/new/choose .
You can also use #help on Discord: https://discord.gg/vlang .
*** Error code 1

Does anyone have any other ideas on how to get this to work reliably on a modern musl based distro? Thank you very much!

P.S.: Compiling V on alpine works.

I think we only tested musl builds on alpine.

execinfo is a common source of issues, would be best to avoid this dep.

Hello guys,

I just tried again to compile and run V on Chimera Linux, and it working perfectly now. But I don't know whether anything relevant in V, execinfo or Chimera has changed.

doas apk add gmake clang musl-devel

make

./v

>> Welcome to the V REPL ...

execinfo.h is not available on musl (fixes #2397)

builtin: fix execinfo.h is not available on musl (fixes vlang#2397)

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execinfo.h is not available on MUSL #2397

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execinfo.h is not available on MUSL #2397

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unknown-v commented on Oct 18, 2019

radare commented on Oct 19, 2019

joe-conigliaro commented on Oct 19, 2019

unknown-v commented on Oct 19, 2019

radare commented on Oct 19, 2019

radare commented on Oct 19, 2019

unknown-v commented on Oct 19, 2019

bogen85 commented on Oct 23, 2019

medvednikov commented on Oct 23, 2019

bogen85 commented on Oct 23, 2019

comcloudway commented on Dec 6, 2022

Brixy commented on Aug 8, 2024

medvednikov commented on Aug 9, 2024

Brixy commented on Dec 27, 2024

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