GCC generation of symbols for use with GDB

["David Mc Kenna" <mckennad@esatclear.ie>]

Hi Folks,

I have come across a problem when I am compiling multi files using gcc which
are then used for debugging with GDB.

I have two files, startup.s and interrupts.c. Startup.s is an initialization
file for use with an ARM7TDMi core and interrupts.c is my main file. When I
try to generate my ELF file using the following command:

arm-elf-gcc.exe \
   /c/test/headers/gnu/startup.s $1.c /c/test/gcc/interrupts/irq.o -mthumb -mthumb-interwork
-mcpu=arm7tdmi\
   -g -Wall -nostartfiles -mlittle-endian -save-temps -O$2 \
   -o $1.elf 2> error.out

It generates the ELF file successfully. But when I launch GDB and do
target sim, load, b main, I get the following error:

Internal error: pc 0x0 in read in psymtab, but not in symtab.

Next I placed the startup.s code into an inline assembly command which is placed
at the top of the C file, all is well. GDB behaves normally.

Any ideas? My version of gcc is gcc version 3.3.2 20030825 (prerelease) and
gdb is GNU gdb 20030901

My startup.s code is :

	b 	test_start	@			SVC	0x00
	b	UDINST_Startup	@ 	Undefined Instr.UND	0x04
	b	SWI_Startup	@	SWI _Startup	SVC	0x08
	b 	PABORT_Startup	@	Prefetch Abort	ABORT	0x0C
	b	DABORT_Startup	@	Data Abort	ABORT	0x10
	b	RESERVED
	b	IRQ_Startup	@	IRQ _Startup	IRQ	0x18
	b	FIQ_Startup	@	FIQ _Startup	FIQ	0x1C
UDINST_Startup:
	ldr pc, [pc, #20]	@ 	Undefined Instruction _Startup	UND	0x04
SWI_Startup:
	b	ADI_SWI_Interrupt_Setup	@	SWI _Startup			SVC	0x08
PABORT_Startup:
	ldr pc, [pc, #20]	@	Prefetch Abort			ABORT	0x0C
DABORT_Startup:
	ldr pc, [pc, #20]	@	Data Abort			ABORT	0x10
RESERVED:
	ldr pc, [pc, #20]	
IRQ_Startup:
	b	ADI_IRQ_Interrupt_Setup	@	IRQ _Startup			IRQ	0x18

FIQ_Startup:
	b 	ADI_FIQ_Interrupt_Setup	@	FIQ _Startup			FIQ	0x1C

.global UDINSTVector
UDINSTVector:
        .word .Int_Return
.global SWIVector        
SWIVector:
        .word .Int_Return
.global PABORTVector        
PABORTVector:
        .word .Int_Return
.global DABORTVector
DABORTVector:
        .word .Int_Return
.global RESERVEDVector
RESERVEDVector:
        .word .Int_Return
.global IRQVector
IRQVector:
        .word .Int_Return
.global FIQVector       
FIQVector:
        .word .Int_Return
.global Int_Return
.Int_Return:
	SUBS	pc, lr, #4	@	return from interrupt
.global test_start
test_start: 

Thanks in advance,
Dave Mc Kenna



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