bug in gcc2.2.2, please acknowledge.

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2 total messages Started by Beau Paisley Sat, 25 Jul 1992 00:16

#198

Author: Beau Paisley
Date: Sat, 25 Jul 1992 00:16

27 lines
950 bytes

We have sent this bug message 3 times.  Please
acknowledge, and suggest a work-around.

/* When you execute this program it generates an illegal instruction message */
/* No syntax error is given for the illegal allocation syntax */

extern "C" void exit( int );

int test(int j)
{
	return( 0 );
}

main( )
{
	int n=4;
	double x[n];	/* This seems to be the statement that gcc goofs up */
			/* The c++ version of gcc messes it up also */
	int i;
	i= test(0);

	exit(0);
}

Beau Paisley
apl/uw
206-367-0599

Re: bug in gcc2.2.2, please acknowledge.

#201

Author: Colin Plumb
Date: Fri, 24 Jul 1992 23:57

88 lines
2483 bytes

In article <9207250016.AA02921@bass.noname> paisley@bass.ai.mit.EDU (Beau Paisley) writes:
>/* When you execute this program it generates an illegal instruction message */
>/* No syntax error is given for the illegal allocation syntax */
>
>extern "C" void exit( int );
>
>int test(int j)
>{
>	return( 0 );
>}
>
>main( )
>{
>	int n=4;
>	double x[n];	/* This seems to be the statement that gcc goofs up */
>			/* The c++ version of gcc messes it up also */
>	int i;
>	i= test(0);
>
>	exit(0);
>}

To save people the trouble of flaming for a proper bug report, I have
duplicated this error on gcc 2.2.2 for a SPARC.

Reading specs from /gnu/lib/gcc-lib/sun4/2.2.2/specs
gcc version 2.2.2
 /gnu/lib/gcc-lib/sun4/2.2.2/cpp -lang-c -v -undef -D__GNUC__=2 -Dsparc -Dsun -Dunix -D__sparc__ -D__sun__ -D__unix__ -D__sparc -D__sun -D__unix /tmp/bug.c /usr/tmp/cca11767.i
GNU CPP version 2.2.2 (sparc)
 /gnu/lib/gcc-lib/sun4/2.2.2/cc1 /usr/tmp/cca11767.i -quiet -dumpbase bug.c -version -o /usr/tmp/cca11767.s
GNU C version 2.2.2 (sparc) compiled by GNU C version 2.2.2.
 as -o bug.o /usr/tmp/cca11767.s
 /gnu/lib/gcc-lib/sun4/2.2.2/ld -e start -dc -dp /lib/crt0.o -L/gnu/lib/gcc-lib/sun4/2.2.2 -L/gnu/lib bug.o -lgcc -lc -lgcc

The resultant a.out file dumps core with an illegal instruction error.
The assembler produced is

gcc2_compiled.:
.text
	.align 4
	.global _test
	.proc	04
_test:
	!#PROLOGUE# 0
	save %sp,-112,%sp
	!#PROLOGUE# 1
	st %i0,[%fp+68]
	mov 0,%i0
	b,a L1
L1:
	ret
	restore
	.align 4
	.global _main
	.proc	04
_main:
	!#PROLOGUE# 0
	save %sp,-144,%sp
	!#PROLOGUE# 1
	call ___main,0
	nop
	mov %sp,%l2
	mov 4,%o0
	st %o0,[%fp-20]
	ld [%fp-20],%o0
	add %o0,-1,%l0
	add %l0,1,%l1
	sll %l1,6,%o0
	mov %o0,%l1
	add %l0,1,%o1
	sll %o1,3,%o0
	add %sp,116,%o2
	sub %o2,%sp,%o1
	add %o0,%o1,%o0
	sub %sp,%o0,%sp
	add %sp,116,%l3
	mov 0,%o0
	call _test,0
	nop
	st %o0,[%fp-24]
	mov 0,%o0
	call _exit,0
	nop
	mov %l2,%sp
L2:
	ret
	restore

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