Re: [dpdk-dev] Useful: Simple C++ program & Makefile

[Dan Kan <dan@nyansa.com>]

Hamid,
I'm in the same situation as you in which I would like to write most of the
application logic in C++. I was able to use CC=g++ by slightly modifying
the makefiles in mk. I replaced all occurrences of "%.c" with "%.cc" using
the following command.

find . -name "*.mk" -exec sed -i 's/%\.c\([^[:alpha:]]\)/%\.cc\1/g' {} \;

I also remove some warning flags as errors.

Here are the diffs:

diff -r mk/internal/rte.compile-pre.mk ../temp/dpdk-1.5.1r2/mk/internal/
rte.compile-pre.mk
39c39
< src2obj = $(strip $(patsubst %.cc,%.o,\
---
> src2obj = $(strip $(patsubst %.c,%.o,\
48c48
< src2dep = $(strip $(call dotfile,$(patsubst %.cc,%.o.d, \
---
> src2dep = $(strip $(call dotfile,$(patsubst %.c,%.o.d, \
53c53
< src2cmd = $(strip $(call dotfile,$(patsubst %.cc,%.o.cmd, \
---
> src2cmd = $(strip $(call dotfile,$(patsubst %.c,%.o.cmd, \
125c125
< %.o: %.cc $$(wildcard $$(dep_$$@)) $$(DEP_$$(@)) FORCE
---
> %.o: %.c $$(wildcard $$(dep_$$@)) $$(DEP_$$(@)) FORCE
diff -r mk/rte.module.mk ../temp/dpdk-1.5.1r2/mk/rte.module.mk
36,37c36,37
< ifneq ($(MODULE),$(notdir $(SRCS-y:%.cc=%)))
< $(MODULE)-objs += $(notdir $(SRCS-y:%.cc=%.o))
---
> ifneq ($(MODULE),$(notdir $(SRCS-y:%.c=%)))
> $(MODULE)-objs += $(notdir $(SRCS-y:%.c=%.o))
diff -r mk/toolchain/gcc/rte.vars.mk ../temp/dpdk-1.5.1r2/mk/toolchain/gcc/
rte.vars.mk
71,73c71,73
< WERROR_FLAGS := -W -Wall -Werror
< WERROR_FLAGS += -Wmissing-declarations -Wpointer-arith
< WERROR_FLAGS += -Wcast-align -Wcast-qual
---
> WERROR_FLAGS := -W -Wall -Werror -Wstrict-prototypes -Wmissing-prototypes
> WERROR_FLAGS += -Wmissing-declarations -Wold-style-definition
-Wpointer-arith
> WERROR_FLAGS += -Wcast-align -Wnested-externs -Wcast-qual


Dan


On Thu, Jan 9, 2014 at 10:30 PM, Hamid Ramazani <mrramazani@gmail.com>wrote:

> > I don't exactly know what is needed for C++. Please keep us informed.
>
> Hey Thomas,
>
> I've attached a simple program (main.cpp main.h and Makefile) that has
> a C++ class and just prints some messages in the output.
> Despite the fact that it's working fine, I'm sure the Makefile could
> be written much better; Maybe I made it completer in future.
>
> All the Best,
> --Hamid
>
> On 1/3/14, Thomas Monjalon <thomas.monjalon@6wind.com> wrote:
> > Hello,
> >
> > 03/01/2014 11:48, Hamid Ramazani :
> >> eal_timer.c:(.text+0x42c): undefined reference to `clock_gettime'
> >
> > From "man clock_gettime":
> > Link with -lrt (only for glibc versions before 2.17).
> >
> >>      g++ -m64 -pthread  -march=native -DRTE_MACHINE_CPUFLAG_SSE
> >> -DRTE_MACHINE_CPUFLAG_SSE2 -DRTE_MACHINE_CPUFLAG_SSSE3
> >>
> -DRTE_COMPILE_TIME_CPUFLAGS=RTE_CPUFLAG_SSE,RTE_CPUFLAG_SSE2,RTE_CPUFLAG_SS
> >> SE3 -I/home/hamid/dpdk/dpdk-1.5.1r1/examples/sample/build/include
> >> -I/home/hamid/dpdk/dpdk-1.5.1r1/x86_64-default-linuxapp-gcc/include
> >> -include
> >>
> /home/hamid/dpdk/dpdk-1.5.1r1/x86_64-default-linuxapp-gcc/include/rte_conf
> >> ig.h -O3 -W -Wall -Werror -Wmissing-declarations -Wpointer-arith
> >> -Wcast-align -Wcast-qual -Wformat-nonliteral -Wformat-security -Wundef
> >> -Wwrite-strings -Wl,-melf_x86_64 -Wl,-export-dynamic sample.cpp -o
> >> sample -Wl,-L/home/hamid/dpdk/dpdk-1.5.1r1/examples/sample/build/lib
> >> -Wl,-L/home/hamid/dpdk/dpdk-1.5.1r1/x86_64-default-linuxapp-gcc/lib
> >> -Wl,-L/home/hamid/dpdk/dpdk-1.5.1r1/x86_64-default-linuxapp-gcc/lib
> >> -Wl,-lrte_kni -Wl,-lrte_pmd_e1000 -Wl,-lrte_pmd_ixgbe -Wl,-lrte_mbuf
> >> -Wl,-lrte_cmdline -Wl,-lrte_timer -Wl,-lrte_hash -Wl,-lrte_lpm
> >> -Wl,--start-group -Wl,-lethdev -Wl,-lrte_malloc -Wl,-lrte_mempool
> >> -Wl,-lrte_ring -Wl,-lrte_eal -Wl,-ldl -Wl,--end-group
> >
> > Try CONFIG_RTE_BUILD_COMBINE_LIBS=y and -lintel_dpdk instead of all these
> > libraries. You can also remove the warning options if you want.
> >
> > You can also try to build your Makefile by including files like
> > mk/rte.extapp.mk and defining CC=g++.
> > I don't exactly know what is needed for C++. Please keep us informed.
> >
> > --
> > Thomas
> >
>