Bug 2440977

Summary:	luaL_openlibs not exported
Product:	[Fedora] Fedora	Reporter:	Jaroslav Škarvada <jskarvad>
Component:	lua	Assignee:	Tom "spot" Callaway <spotrh>
Status:	CLOSED NOTABUG	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	rawhide	CC:	4le, drjohnson1, lua-packagers-sig, mhroncok, michel, spotrh
Target Milestone:	---
Target Release:	---
Hardware:	Unspecified
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-02-19 14:28:55 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2440557

Description Jaroslav Škarvada 2026-02-19 13:32:16 UTC

According to the Lua 5.5 doc the function should be available:
https://www.lua.org/manual/5.5/manual.html#luaL_openlibs

But it isn't exported. It's causing rrdtool Lua bindings not to build.


Reproducible: Always

Steps to Reproduce:
1. cat >test.c <<:EOF
char luaL_openlibs ();
int
main ()
{
return luaL_openlibs ();
  ;
  return 0;
}
:EOF
2. gcc -o test test.c -llua

Actual Results:
/usr/bin/ld.bfd: /tmp/ccnn2IFm.o: in function `main':
test.c:(.text+0x5): undefined reference to `luaL_openlibs'
collect2: error: ld returned 1 exit status


Expected Results:
No error

Additional Information:
With Lua 5.4 it works as expected.

Comment 1 Jaroslav Škarvada 2026-02-19 13:33:26 UTC

Related rrdtool FTBFS: https://bugzilla.redhat.com/show_bug.cgi?id=2440557

Comment 2 Jaroslav Škarvada 2026-02-19 13:35:36 UTC

rrdtool configure output:
checking for lua... /usr/bin/lua
checking for lua >= 5.0... 5.5 found
checking for lua55/lua.h... no
checking for lua5.5/lua.h... no
checking for lua.h... yes
checking for lualib.h... yes
checking for lauxlib.h... yes
checking for library containing lua_call... -llua
checking for library containing luaL_openlibs... no
checking for library containing luaL_module... no
checking for library containing luaL_openlib... no
Lua headers found but not the libraries! Please reinstall the dev packages for Lua 5.5

Comment 3 Tom "spot" Callaway 2026-02-19 14:19:53 UTC

So, the Lua 5.5 docs are wrong: there is no luaL_openlibs() function in the code anymore. It's been replaced with luaL_openselectedlibs(), and you can see that in the lualib.h header:

#define luaL_openlibs(L)	luaL_openselectedlibs(L, ~0, 0)

The rrdtool configure check needs to be updated to look for luaL_openselectedlibs(), ideally when lua 5.5+ is found, but crudely, as an optional function in the list it is already trying.

Comment 4 Jaroslav Škarvada 2026-02-19 14:28:40 UTC

Thanks, I will forward to rrdool upstream.