Message-ID: <6b4606c2-8166-4c10-b08f-8a4bf5d507cc@gmail.com>
Date: Sat, 7 Feb 2026 02:39:57 +0000
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Subject: Re: Linker not finding library
To: Stefano Cossu <stefano@cossu.cc>, ~alpine/users@lists.alpinelinux.org
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From: Naomi Rennie-Waldock <naomi.renniewaldock@gmail.com>
In-Reply-To: <f3c362e7-7431-4289-b857-254055513913@cossu.cc>
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On 07/02/2026 01:59, Stefano Cossu wrote:
> OK, I think I got sidetracked by the ldd error when I tried on more 
> general libraries while debugging a "symbol not found" for a Lua/C 
> library that I built on top of LMDB and the Lua API.
>
> the LD_PRELOAD env variable works, though:
>
> LD_PRELOAD="/usr/lib/liblmdb.so:/usr/lib/libuuid.so:/usr/lib/libxxhash.so" 
> lua5.4 -e 'term = require "volksdata.term"'
>
> (volksdata is my library that uses the 3 libraries in LD_PRELOAD)
>
> As I need to preload several libraries (notably NOT lua.h), I could 
> add those to ld.so.preload, but I'm just wondering if this is more 
> like a hack than a recommended practice.
>
> Thanks a lot for the help so far.
> s
>

Can you try building volksdata with these two changes to the Makefile:

-CFLAGS = -shared -Wall -Wextra -fPIC
+CFLAGS += -shared -Wall -Wextra -fPIC

-LDFLAGS = -L$(PREFIX)/lib -L$(VOLK_LIBDIR) -llua -llmdb -lxxhash -luuid
+LDFLAGS += -L$(PREFIX)/lib -L$(VOLK_LIBDIR) -llua -Wl,--no-as-needed 
-llmdb -lxxhash -luuid


And then build with: CFLAGS=$(pkg-config lua5.4 --cflags) 
LDFLAGS=$(pkg-config lua5.4 --libs) make


That should give you a working build:

~/volksdata_lua # CFLAGS=$(pkg-config lua5.4 --cflags) 
LDFLAGS=$(pkg-config lua5.4 --libs) make install
mkdir -p lib/
cc -I/usr/local/include -Iext/volksdata/build/include 
-I/usr/include/lua5.4 -shared -Wall -Wextra -fPIC -DNDEBUG -O3 -g0 
-L/usr/lib/lua5.4 -llua -lm -L/usr/local/lib -Lext/volksdata/build -llua 
-Wl,--no-as-needed -llmdb -lxxhash -luuid -o lib/volksdata.so src/*.c 
ext/volksdata/build/libvolksdata.a
mkdir -p /usr/local/lib/lua/5.4
install -p lib/volksdata.so /usr/local/lib/lua/5.4
~/volksdata_lua # LD_PRELOAD=/usr/lib/lua5.4/liblua.so ldd 
/usr/local/lib/lua/5.4/volksdata.so
         /lib/ld-musl-x86_64.so.1 (0x7f7d1f0e1000)
         /usr/lib/lua5.4/liblua.so => /usr/lib/lua5.4/liblua.so 
(0x7f7d1f071000)
         liblmdb.so.0 => /usr/lib/liblmdb.so.0 (0x7f7d1f059000)
         libxxhash.so.0 => /usr/lib/libxxhash.so.0 (0x7f7d1f046000)
         libuuid.so.1 => /usr/lib/libuuid.so.1 (0x7f7d1f03d000)
         libc.musl-x86_64.so.1 => /lib/ld-musl-x86_64.so.1 (0x7f7d1f0e1000)
~/volksdata_lua #  lua5.4 -e 'term = require "volksdata.term"'
02:36:16 INFO  src/environment.c:123: Volksdata environment initialized.
02:36:16 INFO  src/environment.c:149: Volksdata environment torn down.