[Buildroot] Question about passing the right TARGET_CC and TARGET_LD to .c and .cpp Makefile in same project
Nils Köhler
nk_clean at ibt-interfaces.de
Sat May 2 16:18:00 UTC 2015
Hello,
I have a problem to compile .c and .cpp sources together in one project.
For .c files everything is fine. but with .cpp i run into problems. It
compiles witout any error, but will not run on target.
The executeble itselv is present, but linked against host. I can run the
executeble on the host but not on the target.
I have googeled a lot but actually i found no way to solve the problem.
I monitored two problems to build my .cpp executebles of a project named
connect:
1. Problem
For a multi input file .cpp application the host g++ is used,
instead of the TARGET_CC, it seems that TARGET_CC is not passed
correctly into the makefile see below [1. Problem]
2. Problem
In case of linking the parts together LD="" Libary path is emty
see below [2. Problem]
The pure .c program the project is compiling fine with right lib
and gcc, it also runs on the target.
[Cmmented part output of a make run]
[1. Problem]
g++ -Wall -Wextra -m32 -g -rdynamic -pedantic -Wshadow -fbounds-check
-fstack-protector-all -c -o util.o util.cpp
g++ -Wall -Wextra -m32 -g -rdynamic -pedantic -Wshadow -fbounds-check
-fstack-protector-all -c -o tally.o tally.cpp
g++ -Wall -Wextra -m32 -g -rdynamic -pedantic -Wshadow -fbounds-check
-fstack-protector-all -o tally tally.o util.o
[2. Problem]
# /usr/bin/make -j2
CXX"/home/koehler/s/br/buildroot/output/host/usr/bin/i586-buildroot-linux-uclibc-g++"
LD="" -C /home/koehler/s/br/buildroot/out
put/build/connect-1.0 tally
[Normal .c program in same project compiles fine and run on target too]
# /usr/bin/make -j2
CC="/home/koehler/s/br/buildroot/output/host/usr/bin/i586-buildroot-linux-uclibc-gcc"
LD="/home/koehler/s/br/buildroot/output/h
ost/usr/bin/i586-buildroot-linux-uclibc-ld" -C
/home/koehler/s/br/buildroot/output/build/connect-1.0 gpi_mon
Does anyone have an idear for me how to solve this issue?
Regards
NIls
----------------------------------------------------------------------------------
Here are the part of the buildroot makefile I use:
connect.mk for CONNECT Package:
define CONNECT_BUILD_CMDS
$(MAKE) CC="$(TARGET_CC)" LD="$(TARGET_LD)" -C $(@D) all
$(MAKE) -C $(LINUX_DIR) $(LINUX_MAKE_FLAGS) M=$(@D) modules_install
endef
define CONNECT_INSTALL_TARGET_CMDS
$(INSTALL) -D -m 0755 $(@D)/tally $(TARGET_DIR)/bin/tally
$(INSTALL) -D -m 0755 $(@D)/gpi_mon $(TARGET_DIR)/bin/gpi_mon
endef
define CONNECT_DEVICES
/dev/debug c 666 0 0 42 0 - - -
endef
$(eval $(generic-package))
------------------------------------------------------------------------------------
And the Makefile for my sourcecode:
# source makefile
ccflags-y+=-DUSE_PLATFORM_DEVICE
ccflags-y+=-Wall -rdynamic -Wshadow -fbounds-check
# Executebles and objects
EXEC = gpi_mon tally
OBJS = tally.o util.o
#dependencies CPP program
tally: tally.o util.o
tally.o: defines.h tally.h tally.cpp
util.o: defines.h tally.h util.cpp
#dependencies C program
gpi_mon.o: defines.h gpi_mon.c
KERNELDIR ?=
/home/koehler/s/br/buildroot/output/build/linux-$(BR2_LINUX_KERNEL_VERSION)
all: modules program
modules:
$(MAKE) -C $(KERNELDIR) M=$$PWD modules
modules_install:
$(MAKE) -C $(KERNELDIR) M=$$PWD modules_install
program: $(EXEC)
$(CC) $(LDFLAGS) -o $@ $(OBJS) $(LDLIBS)
clean:
rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions
modules.order Module.symvers dio *.tmp tally gpi_mon
----------------------------------------------------------------------------------------------------
I use buildroot actual git rep last pull:
koehler at koehler-laptop-ubuntu-final:~/s/br/buildroot$ git log
commit 94856075660dab56249fbe3452b34e489c2a79c5
Author: Peter Korsgaard <peter at korsgaard.com>
Date: Mon Apr 27 00:10:53 2015 +0200
Linux Kernel 3.18.12
--
-------------------------------------------------
IBT Interfaces
inh. Nils Köhler
Im Taubhaus 19
63322 Rödermark
Tel. +49-6074-6964-160
Tel. +49-6074-6964-161
Email: nils.koehler at ibt-interfaces.de
Ust-IdNr:DE813155747
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