Re: xdp2 on ubuntu-24.04.3-live-server-amd64?

I added the extra packages "clang-tools libclang-dev llvm-dev "

The full set of packages is now "build-essential gcc-multilib
pkg-config bison flex libboost-all-dev libpcap-dev graphviz libelf-dev
clang clang-tools libclang-dev llvm llvm-dev libbpf-dev
linux-tools-$(uname -r)"

das@ubuntu2404:~/xdp2/src$ ./configure


Platform is default
Architecture is x86_64
Architecture includes for x86_64 not found, using generic
Target Architecture is
COMPILER is gcc
XDP2_CLANG_VERSION=3D18.1.3
XDP2_C_INCLUDE_PATH=3D/usr/lib/llvm-18/lib/clang/18/include
XDP2_CLANG_RESOURCE_PATH=3D/usr/lib/llvm-18/lib/clang/18

das@ubuntu2404:~/xdp2/src$

On Fri, Sep 26, 2025 at 5:53=E2=80=AFPM Tom Herbert <[email protected]> w=
rote:
>
> On Fri, Sep 26, 2025 at 5:47=E2=80=AFPM dave seddon <dave.seddon.ca@gmail=
.com> wrote:
> >
> > Ha! Indeed. I have a version of configure that has significantly more o=
utput. ( I removed all the pipes to null, which allowed me to get miles pas=
t this in my nix version. )
> >
> >
> >
> > das@ubuntu2404:~/xdp2/src$ cp configure old.configure
> >
> > das@ubuntu2404:~/xdp2/src$ diff -u ./configure ./old.configure
> > --- ./configure 2025-09-27 00:40:29.837033843 +0000
> > +++ ./old.configure     2025-09-27 00:38:51.186921865 +0000
> > @@ -163,7 +163,7 @@
> >  }
> >  EOF
> >         $HOST_CXX -o $TMPDIR/clang_lib $TMPDIR/clang_lib.cpp    \
> > -                        `$HOST_LLVM_CONFIG --ldflags --cxxflags` -lcla=
ng -lLLVM -lclang-cpp
> > +                        `$HOST_LLVM_CONFIG --ldflags --cxxflags` -lcla=
ng -lLLVM -lclang-cpp > /dev/null 2>&1
> >         case $? in
> >                 0)      ;;
> >                 *)      echo Clang library missing or broken\! 1>&2
> > das@ubuntu2404:~/xdp2/src$
> >
> > das@ubuntu2404:~/xdp2/src$ ./configure
> >
> >
> > Platform is default
> > Architecture is x86_64
> > Architecture includes for x86_64 not found, using generic
> > Target Architecture is
> > COMPILER is gcc
> > config.SNTIAl/clang_lib.cpp:1:10: fatal error: clang/Frontend/CompilerI=
nstance.h: No such file or directory
> >     1 | #include <clang/Frontend/CompilerInstance.h>
> >       |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > compilation terminated.
> > Clang library missing or broken!
> > das@ubuntu2404:~/xdp2/src$
> >
> >
> > I'm just using a little kvm VM with the base ubuntu LTS installed.  You=
 guys must be developing on another distro?  I'm really just looking to und=
erstand the versions of things that work, so I can nix-ify this.
>
> Did you Google it? Here's what I got:
> https://stackoverflow.com/questions/20363082/working-with-clang-in-c
>
> Tom
>
> >
> > On Fri, Sep 26, 2025, 17:26 Tom Herbert <[email protected]> wrote:
> >>
> >> On Fri, Sep 26, 2025 at 5:08=E2=80=AFPM dave seddon <dave.seddon.ca@gm=
ail.com> wrote:
> >> >
> >> > I hope I'm not doing something silly
> >> >
> >> > das@ubuntu2404:/usr/lib/llvm-18/lib$ ls -la | grep libclang
> >> > lrwxrwxrwx 1 root root        40 May 27  2024 libclang-18.so.1 ->
> >> > ../../x86_64-linux-gnu/libclang-18.so.18
> >> > lrwxrwxrwx 1 root root        40 May 27  2024 libclang-18.so.18 ->
> >> > ../../x86_64-linux-gnu/libclang-18.so.18
> >> > -rw-r--r-- 1 root root  64796088 May 27  2024 libclang-cpp.so.18.1
> >> > lrwxrwxrwx 1 root root        17 May 27  2024 libclang.so.1 -> libcl=
ang-18.so.18
> >> >
> >> > das@ubuntu2404:/usr/lib/llvm-18/lib$ sudo ln -s libclang-cpp.so.18.1
> >> > libclang-cpp.so
> >> >
> >> > das@ubuntu2404:/usr/lib/llvm-18/lib$ ls -la | grep libclang
> >> > lrwxrwxrwx 1 root root        40 May 27  2024 libclang-18.so.1 ->
> >> > ../../x86_64-linux-gnu/libclang-18.so.18
> >> > lrwxrwxrwx 1 root root        40 May 27  2024 libclang-18.so.18 ->
> >> > ../../x86_64-linux-gnu/libclang-18.so.18
> >> > lrwxrwxrwx 1 root root        20 Sep 27 00:01 libclang-cpp.so ->
> >> > libclang-cpp.so.18.1
> >> > -rw-r--r-- 1 root root  64796088 May 27  2024 libclang-cpp.so.18.1
> >> > lrwxrwxrwx 1 root root        17 May 27  2024 libclang.so.1 -> libcl=
ang-18.so.18
> >> > das@ubuntu2404:/usr/lib/llvm-18/lib$
> >> >
> >> > das@ubuntu2404:~$ cd xdp2/src/
> >> > das@ubuntu2404:~/xdp2/src$ ./configure
> >> >
> >> >
> >> > Platform is default
> >> > Architecture is x86_64
> >> > Architecture includes for x86_64 not found, using generic
> >> > Target Architecture is
> >> > COMPILER is gcc
> >> > Clang library missing or broken!
> >>
> >> Unfortunately, we've done too good of a job hiding output from the
> >> user :-(. Can you edit configure script and the build line under
> >> check_clang_lib:
> >>
> >> $HOST_CXX -o $TMPDIR/clang_lib $TMPDIR/clang_lib.cpp \
> >> `$HOST_LLVM_CONFIG --ldflags --cxxflags` -lclang -lLLVM -lclang-cpp >
> >> /dev/null 2>&1
> >>
> >> to
> >>
> >> $HOST_CXX -o $TMPDIR/clang_lib $TMPDIR/clang_lib.cpp \
> >> `$HOST_LLVM_CONFIG --ldflags --cxxflags` -lclang -lLLVM -lclang-cpp
> >>
> >> That should give the error causing the failure
> >>
> >> Tom
> >>
> >>
> >> > das@ubuntu2404:~/xdp2/src$
> >> >
> >> >
> >> > Also tried this, although I'm not sure the full path makes much diff=
erence
> >> >
> >> > das@ubuntu2404:/usr/lib/llvm-18/lib$ sudo ln -s
> >> > /usr/lib/llvm-18/lib/libclang-cpp.so.18.1
> >> > /usr/lib/llvm-18/lib/libclang-cpp.so
> >> >
> >> > das@ubuntu2404:~/xdp2/src$ ls -la /usr/lib/llvm-18/lib/ | grep clang
> >> > drwxr-xr-x 3 root root      4096 Sep 26 23:59 clang
> >> > lrwxrwxrwx 1 root root        40 May 27  2024 libclang-18.so.1 ->
> >> > ../../x86_64-linux-gnu/libclang-18.so.18
> >> > lrwxrwxrwx 1 root root        40 May 27  2024 libclang-18.so.18 ->
> >> > ../../x86_64-linux-gnu/libclang-18.so.18
> >> > lrwxrwxrwx 1 root root        41 Sep 27 00:06 libclang-cpp.so ->
> >> > /usr/lib/llvm-18/lib/libclang-cpp.so.18.1
> >> > -rw-r--r-- 1 root root  64796088 May 27  2024 libclang-cpp.so.18.1
> >> > lrwxrwxrwx 1 root root        17 May 27  2024 libclang.so.1 -> libcl=
ang-18.so.18



--=20
Regards,
Dave Seddon
+1 415 857 5102