Sorry for the late reply. I just got back to this issue.

> In general this (should) only happen if the binaries are really
> identical (e.g. when one of the packages build requires the other, but
> instead of linking/rebuilding some sources it simply copies a binary
> directly).
> 
> The build-id is (also) derived from the full nvra. So really cannot be
> identical even if the sources are. But this relies on the binaries
> being build with debuginfo. So maybe some code isn't build with -g?

I *think* both neko and haxelib were built with debuginfo, as I can find `-g` 
in the logs.

haxe's build log: 
https://kojipkgs.fedoraproject.org//packages/haxe/4.2.5/5.fc38/data/logs/x86_64/build.log
Relevant lines of building haxelib:

    [ 50%] Building C object CMakeFiles/haxelib.dir/run.c.o
    /usr/bin/gcc   -O2 -flto=auto -ffat-lto-objects -fexceptions -g 
-grecord-gcc-switches -pipe -Wall -Werror=format-security 
-Wp,-U_FORTIFY_SOURCE,-D_FORTIFY_SOURCE=3 -Wp,-D_GLIBCXX_ASSERTIONS 
-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong 
-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -m64  -mtune=generic 
-fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection 
-fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -MD -MT 
CMakeFiles/haxelib.dir/run.c.o -MF CMakeFiles/haxelib.dir/run.c.o.d -o 
CMakeFiles/haxelib.dir/run.c.o -c 
/builddir/build/BUILD/haxe-4.2.5/extra/haxelib_src/run.c
    /builddir/build/BUILD/haxe-4.2.5/extra/haxelib_src/run.c:105:13: warning: 
'handle_signal' defined but not used [-Wunused-function]
      105 | static void handle_signal( int signal ) {
          |             ^~~~~~~~~~~~~
    [ 75%] Linking C executable haxelib
    /usr/bin/cmake -E cmake_link_script CMakeFiles/haxelib.dir/link.txt 
--verbose=1
    /usr/bin/gcc -O2 -flto=auto -ffat-lto-objects -fexceptions -g 
-grecord-gcc-switches -pipe -Wall -Werror=format-security 
-Wp,-U_FORTIFY_SOURCE,-D_FORTIFY_SOURCE=3 -Wp,-D_GLIBCXX_ASSERTIONS 
-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong 
-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -m64  -mtune=generic 
-fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection 
-fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -Wl,-z,relro 
-Wl,--as-needed  -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld 
-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -Wl,--build-id=sha1 -rdynamic 
CMakeFiles/haxelib.dir/run.c.o -o haxelib  -lneko


nekovm's build log: 
https://kojipkgs.fedoraproject.org//packages/nekovm/2.3.0/11.fc38/data/logs/x86_64/build.log
The line of building libneko:

    /usr/bin/gcc -fPIC -O2 -flto=auto -ffat-lto-objects -fexceptions -g 
-grecord-gcc-switches -pipe -Wall -Werror=format-security 
-Wp,-U_FORTIFY_SOURCE,-D_FORTIFY_SOURCE=3 -Wp,-D_GLIBCXX_ASSERTIONS 
-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong 
-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -m64  -mtune=generic 
-fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection 
-fno-omit-frame-pointer -mno-omit-leaf-frame-pointer  -Wl,-z,relro 
-Wl,--as-needed  -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld 
-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -Wl,--build-id=sha1 
-specs=/usr/lib/rpm/redhat/redhat-package-notes -shared 
-Wl,-soname,libneko.so.2 -o bin/libneko.so.2.3.0 
CMakeFiles/libneko.dir/vm/alloc.c.o CMakeFiles/libneko.dir/vm/builtins.c.o 
CMakeFiles/libneko.dir/vm/callback.c.o CMakeFiles/libneko.dir/vm/elf.c.o 
CMakeFiles/libneko.dir/vm/interp.c.o CMakeFiles/libneko.dir/vm/load.c.o 
CMakeFiles/libneko.dir/vm/objtable.c.o CMakeFiles/libneko
 .dir/vm/others.c.o CMakeFiles/libneko.dir/vm/hash.c.o 
CMakeFiles/libneko.dir/vm/module.c.o CMakeFiles/libneko.dir/vm/jit_x86.c.o 
CMakeFiles/libneko.dir/vm/threads.c.o  -lgc  -ldl  -lm

Did I miss some detail?

Best regards,
Andy
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