Building a Linux Application Project

Thanks HelmChen for your reply.

After uploading my application to NIOS uClinux , I want to debug my application but *.gdb hasn't been created in NIOS IDE.

I added this code to Makefile as the document suggests but nothing happened :

CFLAGS += -O0 –g

all: app.exe app.gdb …

What should I do to create that *.gdb ?

Regards,

Quan

If you do it like in the examples, you don't to add a line: Set DEBUG=1 in the makefile.

But i don't know how your Makefile looks like...

Hi ,

This is my "makefile" :

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# # configurable options# - set DEBUG = 1 to turn on debugging support#

DEBUG = 1

PROJ_NAME = myapp

INSTALL_DIR =

PROGS := $(PROJ_NAME).exe# CFLAGS +=

cflags += -o0 -g

# # You should not need to modify anything beyond this point#

TOPDIR = .

include $(TOPDIR)/Rules.mak

ifeq '$(DEBUG)' '1'

PROGS += $(PROGS:.exe=.gdb)

endif

# all: $(PROGS)

all: myapp.exe myapp.gdb

.PHONY: clean

clean:

-rm -f *.[oad] *.elf *.gdb *.bin *.exe

.PHONY: install

install: all

ifeq "$(INSTALL_DIR)" ""

$(error No installation directory specified)

endif

mkdir -p $(INSTALL_DIR)/bin

install -v $(filter %.exe, $(PROGS)) $(INSTALL_DIR)/bin

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I can easily create a gdb and debug my HelloWorld application with this makefile, but when I use this for a bigger one of mine , I cannot create it.

I tried to remove ".PHONY: clean ... " but things are not better

This is "Rules.mak" :

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# ########################################################################## Variables and Rules for building Nios II Linux applications# # This file is a "template" that is copied over from the Nios II Linux# Application plug-in. This file should be included within your top-level# Makefile.#

ifeq "$(origin TOPDIR)" "undefined"

TOPDIR := $(shell pwd)

endif

# # The Settings.mak file is automatically generated by Eclipse. It# contains values for all external variables used by this Makefile# fragment.# # The "dash" in front of the include statement indicates that the Make# process will not terminate if it cannot find the Settings.mak file.#

-include $(TOPDIR)/Settings.mak

# This turns on various levels of hardware multiply support# Set the following option to none, mul, or mulx# none := no hardware multiplication support at all# mul := supports use of the mul assembler instruction# mulx := supports use of the mul and mulx assembler instruction

ifeq "$(HW_MUL_SUPPORT)" ""

HW_MUL_SUPPORT := mulx

endif

# # Warn users if external variables have not yet been defined.#

ifeq "$(origin UTILSDIR)" "undefined"

$(warning The location of the utiltiies directory is undefined)

endif

ifeq "$(origin LIBCDIR)" "undefined"

$(warning The location of uClibc is undefined)

endif

# # Path + Name of necessary executables#

EXECSUFFIX := .exe

CROSS := nios2-elf-

CC := $(CROSS)gcc

AR := $(CROSS)ar

LD := $(CROSS)ld

NM := $(CROSS)nm

RANLIB := $(CROSS)ranlib

STRIPTOOL := $(CROSS)strip

ELF2FLT := $(UTILSDIR)/bin/elf2flt

# # Location of important files#

CRT0 := $(LIBCDIR)/lib/crt0.o

LIBC := $(LIBCDIR)/lib/libc.a

LIBGCC := $(shell $(CC) -print-file-name=libgcc.a)

LIBM := $(shell $(CC) -print-file-name=libm.a)

LIBGCCDIR := $(dir $(LIBGCC))

LINKSCRIPT := $(UTILSDIR)/scripts/elf2flt.ld

# # Various flags, modifications are not recommended and not necessarily# supported.# # DEPFLAGS:# -MM : ignore system includes, # -M : include system includes in the dependency#

WARNING_FLAGS := -Wall

# basic C flags to pass to the compiler

CFLAGS += -nostdinc -D__linux__

# if DEBUG is turned on, then turn off optimizations and turn on symbol# generation, else turn on level 2 optimizations

ifeq ($(DEBUG),1)

CFLAGS += -O0 -g

else

CFLAGS += -O2

endif

# pass any additional include directories to the compiler while building the# application

CFLAGS += -I$(LIBCDIR)/include -I$(LIBGCCDIR)/include

# Temporary workaround for nios2-elf-gcc bug# First noticed in v3.4.1 (Altera Nios II 1.1 b131)# To be removed at a later date when bug is resolved.

CFLAGS += -fno-optimize-sibling-calls

# Turn on the various levels of hardware multiplication support.

ifeq ($(strip $(HW_MUL_SUPPORT)),none)

CFLAGS += -mno-hw-mul -mno-hw-mulx

endif

ifeq ($(strip $(HW_MUL_SUPPORT)),mul)

CFLAGS += -mhw-mul -mno-hw-mulx

endif

ifeq ($(strip $(HW_MUL_SUPPORT)),mulx)

CFLAGS += -mhw-mul -mhw-mulx

endif

mulx_help_text := $(shell $(CC) --target-help | grep mulx)

ifeq "$(mulx_help_text)" ""

CFLAGS := $(filter-out -mhw-mulx -mno-hw-mulx, $(CFLAGS))

endif

DEPFLAGS = -E -MM

LDFLAGS := -msys-crt0=$(CRT0) -r -d -L$(LIBCDIR)/lib

LDLIBS := $(LIBM) $(LIBGCC) $(LIBC)

# relocate the absolute elf file if requested

ifneq ($(TEXT),)

TEXT_LOC_OPT := -Ttext $(TEXT)

endif

ifneq ($(DATA),)

DATA_LOC_OPT := -Tdata $(DATA)

endif

ifneq ($(BSS),)

BSS_LOC_OPT := -Tbss $(BSS)

endif

# default stack size is 4K

FLTFLAGS:=

%.exe : %.flt

cp -f $< $@

# # Make a relocatable flat file from an ELF file.# STACKSIZE is defined by individual makefiles.#

%.flt : %.elf

$(ELF2FLT) $(FLTFLAGS) -o $@ $<

# # Make a bound-address ELF file required by GDB for debugging the application.#

%.gdb : %.bin FORCE

$(LD) -T $(LINKSCRIPT) $(TEXT_LOC_OPT) $(DATA_LOC_OPT) $(BSS_LOC_OPT) -o $@ $<

# # Make a relocatable ELF file.#

%.elf : %.bin

$(LD) -T $(LINKSCRIPT) -Ur -o $@ $<

# # Standard stuff: The object file is dependent on the C source and Makefile timestamps#

%.o : %.c Makefile

$(CC) $(CFLAGS) $(WARNING_FLAGS) -c -o $@ $<

%.o : %.cpp Makefile

$(CC) $(CFLAGS) $(WARNING_FLAGS) -o $@ $<

%.bin : %.o

$(CC) $(LDFLAGS) -o $@ $^ $(LDLIBS)

# # Automatically generate dependencies for the .c source files.# Be sure to omitt debug-level flags as this can produce macro def&#39;n output.# The sed "script" makes the .d (in addition to the .c) file a# target of the dependencies so that the .d file is rebuild if required.# e.g. "X.o: <dependency-list>" gets transformed into "X.o X.d: <dependency-list>"#

%.d: %.c

$(SHELL) -ec &#39;$(CC) $(DEPFLAGS) $(CFLAGS) -c $< | sed &#39;\&#39;&#39;s/\($*\)\.o[ :]*/\1.o $@ : /g&#39;\&#39;&#39; >$@; [ -s $@ ] || rm -f $@&#39;

FORCE: ;

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I tried to remove "rm -f ..." (letters in bold) but *.gdb is still not made.

It seems to me that *.gdb has made but was removed somewhere before makefile & Rules.mak complete.

What do you think ?

Quan

Well,

i didn&#39;t test your files, yet. But in my firstlook I&#39;m wondering where do you tell the compiler to compile your source files?

With the &#39;Hello&#39; Makefile you must have a toplevel c-source, which name is equal to your project name. In your case: myapp.c.

Look again at the variable PROJ_NAME and PROGS in the makefile.

HelmChen,

Actually , the above makefile is taken from the Hello application which can be found in : C:\altera\kits\nios2\examples\software\linux\apps\samples\hello

and this Hello project doesn&#39;t need SOURCE specified. When I tried this project , everything was fine : it could create *.gdb for me to debug , run , watch variable ,..... with it.

My app and project names are the same. Anyway , I tried to add "SOURCE : file1.c file2.c file3.c" to my REAL project , which is much larger than hello app , but it could not create *.gdb although object file was created beautifully. I doubted at some "rm ..." commands in makefile and Rules.mak and tried to comment them out but it seemed that the "Build Make Target" didn&#39;t understand my changes. I am also thinking of NIOS 1C12 memory availability for my app (main is ~123772bytes , main.o is ~40200bytes).

Is memoy the problem of mine ?

What do you think ?

Quan