RE: [microblaze-uclinux] c++ non-constant initializers

["Ipaye, Tobi" <tipaye@xxxxxxxxxxxxxx>]

I tried your source code, after using petalinux-new-app to create the
application, I changed the filename to .cpp and did the same in the
makefile rule:
%.o: %.cpp
	$(CC) -c $(CFLAGS) -o $@ $< 
It worked fine.

Here's the source:

#include <stdio.h>

const unsigned char seq[] = { 0x54, 0x45, 0x53, 0x54 };  // TEST 
const unsigned char seq2[] = { seq[0], seq[1], seq[2], seq[3] };

int main() {
     printf("%x %x %x %x\n", seq[0], seq[1], seq[2], seq[3]);
     printf("%x %x %x %x\n", seq2[0], seq2[1], seq2[2], seq2[3]);
     return 0;
}

Here's the makefile:

ifndef PETALINUX
$(error You must source the petalinux/settings.sh script before working
with PetaLinux)
endif

# Point to default PetaLinux root directory
ifndef ROOTDIR
ROOTDIR=$(PETALINUX)/software/petalinux-dist
endif

PATH:=$(PATH):$(ROOTDIR)/tools

UCLINUX_BUILD_USER = 1
-include $(ROOTDIR)/.config
-include $(ROOTDIR)/$(CONFIG_LINUXDIR)/.config
LIBCDIR = $(CONFIG_LIBCDIR)
-include $(ROOTDIR)/config.arch
ROMFSDIR=$(ROOTDIR)/romfs
ROMFSINST=$(ROOTDIR)/tools/romfs-inst.sh

APP = mltcpp

# Add any other object files to this list below
APP_OBJS = mltcpp.o

all: $(APP)

$(APP): $(APP_OBJS)
	$(CC) $(LDFLAGS) -o $@ $(APP_OBJS) $(LDLIBS)

clean:
	-rm -f $(APP) *.elf *.gdb *.o

romfs:
	$(ROMFSINST) $(APP) /bin/$(APP)

%.o: %.cpp
	$(CC) -c $(CFLAGS) -o $@ $<


# Targets for the required .config files - if they don't exist, the tree
isn't
# configured.  Tell the user this, how to fix it, and exit.
${ROOTDIR}/config.arch ${ROOTDIR}/.config:
	@echo "Error: You must configure the PetaLinux tree before
compiling your application"
	@echo ""
	@echo "Change directory to ../../petalinux-dist and 'make
menuconfig' or 'make xconfig'"
	@echo ""
	@echo "Once the tree is configured, return to this directory,
and re-run make."
	@echo ""
	@exit -1


Here's the output when run on the microblaze:

# ./mltcpp
54 45 53 54
54 45 53 54
#

Cheers.

-----Original Message-----
From: owner-microblaze-uclinux@xxxxxxxxxxxxxx
[mailto:owner-microblaze-uclinux@xxxxxxxxxxxxxx] On Behalf Of Nicolas
Schier
Sent: 11 September 2008 07:17
To: microblaze-uclinux@xxxxxxxxxxxxxx
Subject: Re: [microblaze-uclinux] c++ non-constant initializers

Hei!

Are you sure that you are compiling C++-Code? The sample code provided 
seems to confirm to usual C; thus compiling it with gcc on a x86 results

in:

~# gcc test.c
test.c:4: error: initializer element is not constant
test.c:4: error: (near initialization for 'seq2[0]')
test.c:4: error: initializer element is not constant
test.c:4: error: (near initialization for 'seq2[1]')
test.c:4: error: initializer element is not constant
test.c:4: error: (near initialization for 'seq2[2]')
test.c:4: error: initializer element is not constant
test.c:4: error: (near initialization for 'seq2[3]')

Regards,
Nicolas

On Wednesday, 09/10/08 at 17:37 (+0200), Torsten Schmutzler wrote:
> From: Torsten Schmutzler <s6757418@xxxxxxxxxxxxxxxxx>
> To: microblaze-uclinux@xxxxxxxxxxxxxx
> Date: Wed, 10 Sep 2008 17:37:28 +0200
> Subject: [microblaze-uclinux] c++ non-constant initializers
> User-Agent: Thunderbird 2.0.0.16 (X11/20080724)
> 
> Hi,
>
> I'm trying to port a c++ Framework to microblaze, but there are
problems  
> with the generated binaries.
>
> Here is some code to demonstrate the problem:
>
> #include <stdio.h>
>
> const unsigned char seq[] = { 0x54, 0x45, 0x53, 0x54 };  // TEST
> const unsigned char seq2[] = { seq[0], seq[1], seq[2], seq[3] };
>
> int main() {
>     printf("%x %x %x %x\n", seq[0], seq[1], seq[2], seq[3]);
>     printf("%x %x %x %x\n", seq2[0], seq2[1], seq2[2], seq2[3]);
>     return 0;
> }
>
> Compiling and running on a pc gives:
> 54 45 53 54
> 54 45 53 54
>
> builing for mb results in:
> 54 45 53 54
> 0 0 0 0
>
> So it seems the initializers are not run. The code above is legal C++,
so:
> - can somebody reproduce this behavior?
> - Are there compiler switches to make the code work?
> - Or is this just a bug in microblaze-uclinux-g++?
>
> Thanks
> Torsten
>

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