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Forum: ARM programming with GCC/GNU tools virtual functions


Author: Jakub (Guest)
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Hi:)

I would like to use virtual functions. I wrote simple test program:

/*********************************************************************** 
***/
#include "lpc2000.h"

class A {
  public:
  void virtual fun1(){
    GPIO_IOCLR |= (1<<21) ;
  }
};

class B : public A{
  public:
  void fun1(){
    GPIO_IOCLR |= (1<<20);
  }
  void fun3(){
    GPIO_IOCLR |= (1<<18);
  }
};

//new object
B sth ;

int main(){
  //main loop
  while(1){;}
}
/*********************************************************************** 
***/

but compliler returns error:

"C:\DOCUME~1\kuba\USTAWI~1\Temp/ccUDbaaa.o:(.rodata._ZTI1B[typeinfo for
B]+0x0): undefined reference to `vtable for
__cxxabiv1::__si_class_type_info'
C:\DOCUME~1\kuba\USTAWI~1\Temp/ccUDbaaa.o:(.rodata._ZTI1A[typeinfo for
A]+0x0): undefined reference to `vtable for
__cxxabiv1::__class_type_info'
collect2: ld returned 1 exit status
make.exe: *** [main.elf] Error 1"

What is going on or what is wrong ?

Author: Clifford Slocombe (clifford)
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> What is going on or what is wrong ?

There is nothing intrinsically wrong with the code (although you should
consider including a virtual destructor in all virtual classes).

It is usually a good idea to post the entire compile log so we can see
how you are invoking the compiler/linker, and what if any other errors
occur.

Are you invoking the linker via the compiler, or calling the linker
separately? If so, are you using arm-elf-gcc or arm-elf-g++? You can use
gcc for C++ compilation, but if using gcc to launch the linker, it does
not automatically include the C++ library in the link (you need
-lstdc++). It does this automatically if you use g++.

Clifford

Author: Jakub (Guest)
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Clifford Slocombe wrote:
>> What is going on or what is wrong ?
> It is usually a good idea to post the entire compile log so we can see
> how you are invoking the compiler/linker, and what if any other errors
> occur.
> Clifford

My compiler log looks like this:

-------- begin --------
arm-elf-gcc (GCC) 4.1.1 (WinARM)
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is
NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.


Linking: main.elf
arm-elf-gcc  -mcpu=arm7tdmi  -I. -DROM_RUN  -O3 -Wall -Wcast-align
-Wcast-qual -Wimplicit -lgcc -Wpointer-arith -Wswitch -Wredundant-decls
-Wreturn-type -Wshadow -Wunused -Wa,-adhlns=main.cpp   -MD -MP -MF
.dep/main.elf.d    main.cpp     --output main.elf -nostartfiles
-Wl,-Map=main.map,--cref -lc -lnewlib-lpc -lm -lc -lgcc
-Tbuild/LPC2103-ROM.ld
main.cpp:8: warning: 'class diody' has virtual functions but non-virtual
destructor
C:\DOCUME~1\kuba\USTAWI~1\Temp/ccw9baaa.o:(.rodata._ZTI5diody[typeinfo
for diody]+0x0): undefined reference to `vtable for
__cxxabiv1::__class_type_info'
collect2: ld returned 1 exit status
make.exe: *** [main.elf] Error 1

What I can do for compiling without errors? I need virtual functions for
happiness :)

Author: Jakub (Guest)
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Ok, I have changed options in makefile from:
$(CC) $(THUMB) $(ALL_CFLAGS) $(AOBJARM) $(AOBJ) $(COBJARM) $(COBJ)
$(CPPOBJ) $(CPPOBJARM) --output $@ $(LDFLAGS)
to:
$(CPP) $(THUMB) $(ALL_CFLAGS) $(AOBJARM) $(AOBJ) $(COBJARM) $(COBJ)
$(CPPOBJ) $(CPPOBJARM) --output $@ $(LDFLAGS)

Now I have another problem, but solution is (probably) i two other
posts: "C++ and WinARM" and "Linker problems". I will try to solve my
problem with sugestions from this topics:)
Thx

Author: Jakub (Guest)
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I was traying to use standard crt0.S file in my project, but compiler
show result:

-------- begin --------
arm-elf-gcc (GCC) 4.1.1 (WinARM)
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is
NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.


Linking: main.elf
arm-elf-g++  -mcpu=arm7tdmi  -I. -g -DROM_RUN  -Os -Wall -Wcast-align
-Wcast-qual -Wimplicit  -Wpointer-arith -Wswitch -Wredundant-decls
-Wreturn-type -Wshadow -Wunused -Wa,-adhlns=build/crt0.o   -MD -MP -MF
.dep/main.elf.d build/crt0.o    main.cpp     --output main.elf
-nostartfiles -Wl,-Map=main.map,--cref -lc -lnewlib-lpc -lm -lc -lgcc
-TLPC2103-ROM.ld
c:/winarm/bin/../lib/gcc/arm-elf/4.1.1/../../../../arm-elf/bin/ld.exe:bu 
ild/crt0.o:
file format not recognized; treating as linker script
c:/winarm/bin/../lib/gcc/arm-elf/4.1.1/../../../../arm-elf/bin/ld.exe:bu 
ild/crt0.o:1:
syntax error
collect2: ld returned 1 exit status
make.exe: *** [main.elf] Error 1

Why the file format is not recognized? Is it something wrong in makefile
? Maybe this file is incorrect? Why? :(

Author: Clifford Slocombe (clifford)
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Jakub wrote:
> Why the file format is not recognized? Is it something wrong in makefile
> ? Maybe this file is incorrect? Why? :(

A rebuild all may be useful so the log includes information about how
crt0.s was built.

Author: Martin Thomas (Guest)
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Do you see an error-message when compiling the example
lpc2129_newlib_cpp from the example-collection that comes with WinARM? I
do not use C++ in my "real" developments but this example should
demonstrate virtual functions.

Martin Thomas

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