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global constructors not working in gcc 3.2.2EE

 
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tweakoz



Joined: 17 Feb 2004
Posts: 21
Location: Santa Cruz, CA
PostPosted: Tue Feb 17, 2004 10:58 am    Post subject: global constructors not working in gcc 3.2.2EE Reply with quote
my toolchain is hosted on cygwin.
program compiles and links fine, but _init() doesnt seem to do anything

top of main and entire linkfile listed below.

any help would be appreciated

thank,

mtm

Code:

class testclass
{   public:
   int testval;
   testclass()
             : testval( 300 )
   {
   }
   int getval( void ) { return testval; }
};
testclass testinstance;
int main( int argc, char **argv )
{
   MagCheckPoint( "Testval %d\n", testinstance.getval() ); // prints 0
   gdb_stub_main( 0, 0 );
   _init();   // call global / static constructors
   MagCheckPoint( "Testval %d\n", testinstance.getval() ); // prints 0
         
         ... blah blah .....
}


my link file looks like this

Code:

ENTRY(_start);

INPUT( /usr/local/ps2dev/ee/lib/gcc-lib/ee/3.2.2/crtbegin.o )
INPUT( /usr/local/ps2dev/ee/lib/gcc-lib/ee/3.2.2/crtend.o )
INPUT( /usr/local/ps2dev/ee/lib/gcc-lib/ee/3.2.2/crti.o )
INPUT( /usr/local/ps2dev/ee/lib/gcc-lib/ee/3.2.2/crtn.o )

SECTIONS
{
   
   .init 0x00100000:
   {   /* USE GCC's _init() */
      *(.init)
   }
   .fini :
   {   /* USE GCC's _init() */
      *(.fini)
   }
   
   .text :
   {   /* USE PS2LIBS's _start */
      /usr/local/ps2dev/ps2lib/ee/startup/crt0.o(.text)
      *(.text)
      *(.text.*)
       *(.gnu.linkonce.t*)
   }
   
   .ctors :
   {
      KEEP (*crtbegin.o(.ctors))
      KEEP (*(EXCLUDE_FILE (*crtend.o) .ctors))
       KEEP (*(SORT(.ctors.*)))
      KEEP (*(.ctors))   
   }
     
     .dtors :
     {   KEEP (*crtbegin.o(.dtors))
       KEEP (*(EXCLUDE_FILE (*crtend.o) .dtors))
      KEEP (*(SORT(.dtors.*)))
       KEEP (*(.dtors))
     }
   
   .reginfo ALIGN(128): { KEEP(*(.reginfo)) }

   /***************************************/
   /* Static data.  */
   
   .rodata ALIGN(128):   { *(.rodata) }
   .data ALIGN(128):
   {
      *(.data)
       *(.data.*)
       *(.gnu.linkonce.d*)
   }
   .rdata ALIGN(128):
   {
      *(.rdata)
   }
   .rodata      ALIGN(128):
   {
      *(.rodata)
      *(.rodata.*)
      *(.gnu.linkonce.r*)
   }
   _gp = ALIGN(128) + 0x7ff0;
   .lit4 ALIGN(128): { *(.lit4) }
   .lit8 ALIGN(128): { *(.lit8) }
   .sdata ALIGN(128):
   {
      *(.sdata)
      *(.sdata.*)
      *(.gnu.linkonce.s*)
   }

   /***************************************/
   /* Uninitialized data.  */

   .sbss ALIGN(128) (NOLOAD): {
      _fbss = . ;
      *(.scommon)
      *(.sbss)
   }
   .bss ALIGN(128) (NOLOAD): { *(.bss) }
   .COMMON ALIGN(128) (NOLOAD): { *(COMMON) }
   _end_bss = .;

   /***************************************/

   _end = . ;
   PROVIDE(end = .);

   /***************************************/
   /* Symbols needed by crt0.s.  */

   PROVIDE(_heap_size = -1);
   PROVIDE(_stack = -1);
   PROVIDE(_stack_size = 128 * 1024);
   
   /***************************************/
   
}
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MrHTFord



Joined: 10 Feb 2004
Posts: 35
Location: England
PostPosted: Tue Feb 17, 2004 10:24 pm    Post subject: Reply with quote
What you've got there seems ok to me, have you got this before your main function?

Code:
extern "C" {
   extern void _init(void);
};


I'd assume you have as otherwise you'd get linking errors.

My linkfile doesn't explicitly list the crt files as yours does, instead, when linking, I don't specify -nostdlib to gcc (at least, I think that's what I don't do). Posting a disassembly with debugging (-g) would be useful.

Also, does it fail with -O0?

Cheers.
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