[dpdk-dev] Pktgen having problem with Lua on RHEL

[Hossein Golestani]

Hi Keith,

Thanks for your reply. I solved the problem just now. There was no
misspelling. Apparently, for static linking (i.e., linking **.a* files),
there's no need to use *-L*. So, for example, instead of *MYLIBS     +=
-lpktgen_lua -L:/home/me/lua/liblua.a*, I should have simply used *MYLIBS
   += -lpktgen_lua -/home/me/lua/liblua.a*

Thanks,
Hossein



On Wed, Dec 19, 2018 at 9:08 AM Wiles, Keith <keith.wiles at intel.com> wrote:

>
>
> > On Dec 18, 2018, at 7:53 PM, Hossein Golestani <hosseing at umich.edu>
> wrote:
> >
> > Hi,
> >
> > I'm having a hard time compiling Pktgen on a Red Hat machine. The source
> of
> > the problem is the Lua library.
> >
> > I'm using Pktgen 3.5.9, and it requires Lua 5.3. Standard installation of
> > Lua on RHEL ends up having Lua 5.1. So for having the latest release, I
> > need to compile Lua from its source. My eventual problem is that I cannot
> > appropriately link the compiled Lua library to Pktgen.
> >
> > Here's a detailed explanation of what I did:
> >
> > Based on the official website of Lua (link
> > <http://www.lua.org/manual/5.3/readme.html>), for embedding Lua in C/C++
> > programs, the following files are required:
> > *lua.h luaconf.h lualib.h lauxlib.h lua.hpp*
> > *liblua.a* (which is created after compiling Lua)
> >
> > I put these files in the following directory:
> > /home/me/lua/
> > ├── include
> > │   ├── lauxlib.h
> > │   ├── luaconf.h
> > │   ├── lua.h
> > │   ├── lua.hpp
> > │   └── lualib.h
> > └── liblua.a
> >
> > I made the following changes in Pktgen's Makefiles to include the Lua's
> > header files and static library shown above:
> > In *app/Makefile*:
> >
> > Replacing
> >
> > *MYLIBS     += -lpktgen_lua $(shell pkg-config --libs-only-l lua5.3)*
> >
> > with
> >
> > *MYLIBS     += -lpktgen_lua -L:/home/me/lua/liblua.a*
>
> I assume that ‘me’ here is really ‘hossening’ so the real change to is
> /home/hossening/lua/liblua.a right?
>
> I worry that you have mis-spelled on of the lines. The code linked
> compiled so it found the include, but not the lib.
>
> Check and make sure you did not mis-spell something here.
> >
> >
> > Replacing
> >
> > *MYLIB_PATH += -L$(LUA_LIB) $(shell pkg-config --libs-only-L lua5.3)*
> >
> > with
> >
> > *MYLIB_PATH += -L$(LUA_LIB) **-L:/home/me/lua/liblua.a*
> >
> >
> > Replacing
> >
> > *CFLAGS     += -I/usr/include/lua5.3*
> >
> > with
> >
> > *CFLAGS     += -I/home/me/lua/include*
> >
> >
> > In *lib/lua/Makefile*:
> >
> > Replacing
> >
> > *CFLAGS += $(shell pkg-config --cflags lua5.3)*
> >
> > with
> >
> > *CFLAGS += -I/home/me/lua/include*
> >
> >
> > Replacing
> >
> > LDLIBS += -L$(SRCDIR)/../lua/$(RTE_TARGET)/lib -llua
> >
> > with
> >
> > LDLIBS += -L$(SRCDIR)/../lua/$(RTE_TARGET)/lib
> > -L:/home/hosseing/lua/liblua.a
> >
> >
> >
> > Then, when I make Pktgen, I receive thousands of errors, like this:
> >
> */home/me/pktgen-3.5.9/app/../lib/lua/x86_64-native-linuxapp-gcc/lib/libpktgen_lua.a(rte_lua.o):
> > In function `msghandler':*
> > */home/me/pktgen-3.5.9/lib/lua/rte_lua.c:244: undefined reference to
> > `lua_tolstring'*
> > */home/me/pktgen-3.5.9/lib/lua/rte_lua.c:257: undefined reference to
> > `luaL_traceback'*
> > */home/me/pktgen-3.5.9/lib/lua/rte_lua.c:247: undefined reference to
> > `luaL_callmeta'*
> > */home/me/pktgen-3.5.9/lib/lua/rte_lua.c:248: undefined reference to
> > `lua_type'*
> > */home/me/pktgen-3.5.9/lib/lua/rte_lua.c:252: undefined reference to
> > `lua_type'*
> > */home/me/pktgen-3.5.9/lib/lua/rte_lua.c:252: undefined reference to
> > `lua_typename'*
> > *...*
> >
> > The included Lua header files seem to be OK. The problem seems to be
> > because of how I link the liblua.a file. I'd really appreciate it if
> > someone could help me on this.
> >
> > Thanks,
> > Hossein
>
> Regards,
> Keith
>
>